JP6744206B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper.

As a disposable diaper, there is a so-called pants-type disposable diaper in which an exterior body is arranged on the outside of a vertically long absorbent main body having an absorber. The Applicant has previously arranged a hydrophilic web having long fibers highly oriented in the width direction on the back end flap of the outer body of such a pants-type disposable diaper to absorb sweat, and eczema. A technique has been proposed that can effectively prevent the occurrence of rashes and rashes (for example, Patent Document 1).

Further, Patent Document 2 discloses a disposable diaper in which a sweat absorbing sheet that absorbs sweat is joined to a hydrophobic sheet that covers the inner surfaces of the front and rear waist regions of the diaper.

JP, 2006-141549, A JP, 2007-259874, A

The inventors of the present invention arranged a sweat-absorbing sheet that absorbs sweat at the longitudinal end of the outer body of the pants-type disposable diaper, and the sweat absorbed by the sweat-absorbing sheet easily evaporates from the end of the outer body. It was found that it is possible to suppress the stuffiness when wearing a disposable diaper.

However, Patent Documents 1 and 2 do not describe anything about a means for migrating the positively absorbed sweat by using a sweat absorbing sheet at the longitudinal end portion of the outer body of the pants-type disposable diaper.

Therefore, the present invention is to provide a disposable diaper capable of solving the above-mentioned drawbacks of the prior art.

The present invention includes a ventral region disposed on the ventral side of a wearer and a dorsal region disposed on the dorsal side of the wearer, and a crotch region located therebetween, and from the ventral region, A longitudinal direction extending to the dorsal region and a lateral direction orthogonal to the longitudinal direction are provided, and an absorbent body is provided over the abdominal region and the dorsal region, and the longitudinal front and rear ends of the absorbent body, respectively. A disposable diaper having an abdominal waist flap and a dorsal waist flap that are laterally located outwardly from the dorsal waist flap, wherein the dorsal waist flap has an elastic region formed by elastic members arranged in a laterally extended state. Is formed, the back waist flap has a non-woven fabric having a hydrophilic region made of hydrophilic fibers in the stretchable region, and the non-woven fabric having the hydrophilic region has a longitudinal direction of the back region. It is folded back at the folded portion located at the outer end in the direction, and at least one folded portion is arranged closer to the wearer's skin than the elastic member, and the hydrophilic region has a longitudinal length. In this regard, the present invention provides a disposable diaper that straddles the folded-back portion so that the side closer to the wearer's skin becomes longer.

According to the present invention, it can be expected to reduce skin troubles such as eczema, rash, and rash.

FIG. 1 is a perspective view of a pants-type disposable diaper that is a preferred embodiment of the present invention. FIG. 2 is a partially cutaway exploded plan view of the diaper shown in FIG. 1 which has been expanded and stretched, as viewed from the skin contact surface side. FIG. 3 is a sectional view taken along line III-III shown in FIG. FIG. 4 is a vertical cross-sectional view of an abdominal region A and a dorsal region B of a pants-type disposable diaper according to another preferred embodiment of the present invention (corresponding to FIG. 3 ). FIG. 5 is a vertical cross-sectional view of an abdominal region A and a dorsal region B of a pants-type disposable diaper according to another preferred embodiment of the present invention (corresponding to FIG. 3 ). FIG. 6 is a vertical cross-sectional view of an abdominal region A and a dorsal region B of a pants-type disposable diaper of still another preferred embodiment of the present invention (corresponding to FIG. 3 ). FIG. 7 is a vertical cross-sectional view of an abdominal region A and a dorsal region B of a pants-type disposable diaper according to another preferred embodiment of the present invention (corresponding to FIG. 3). FIG. 8 is a vertical cross-sectional view of an abdominal region A and a dorsal region B of a pants-type disposable diaper according to another preferred embodiment of the present invention (corresponding to FIG. 3 ).

The present invention will be described below based on its preferred embodiments with reference to the drawings.
The disposable diaper of the present invention comprises an abdominal region A disposed on the abdominal side of the wearer, a dorsal region B disposed on the dorsal side of the wearer, and a crotch region C located between the A and B. In addition to the above, the vertical direction X extending from the ventral region A to the dorsal region B and the horizontal direction Y orthogonal to the vertical direction X are provided. Further, the disposable diaper of the present invention has the absorber 23 extending over the abdominal region A and the dorsal region B, and is located outward from the front and rear end portions 23A, 23B of the absorber 23 in the longitudinal direction X, respectively. And a ventral waist flap FA and a back waist flap FB that extend in the lateral direction Y. Here, the abdominal region A is a region arranged on the abdomen side of the wearer when the disposable diaper is worn, and the dorsal region B is a region arranged on the back side of the wearer when the disposable diaper is worn. .. Then, the abdominal waist flap FA is a region extending outward in the longitudinal direction X from the outer end edge 23A1 of the front end portion 23A on the abdominal region A side in the longitudinal direction X of the absorbent body 23 and extending in the lateral direction Y, It means a region including a region extending from the front end portion 23A on the ventral region A side in the vertical direction X of the absorbent body 23 to the horizontal direction Y. The back waist flap FB is a region that extends outward in the vertical direction X and extends in the horizontal direction Y from the outer edge 23B1 of the rear end portion 23B on the back side region B side of the absorbent body 23 in the vertical direction X. , And a region extending from the rear end portion 23B on the back side region B side in the vertical direction X of the absorbent body 23 in the horizontal direction Y.

1 and 2 show a pants-type disposable diaper 1 (hereinafter, also referred to as "diaper 1") which is an embodiment of the disposable diaper of the present invention. As shown in FIGS. 1 and 2, the diaper 1 includes an absorbent main body 2 and an exterior body 3 that is arranged on the non-skin facing surface side of the absorbent main body 2 and fixes the absorbent main body 2. 3 has an abdominal waist flap FA and a back waist flap FB that are located outward from the front and rear end portions 23A and 23B in the longitudinal direction X of the absorbent body 23 that constitutes the absorbent main body 2 and extend in the lateral direction Y. ing. The diaper 1 has a pair of side seal portions S, S formed by joining the left and right side edges 3a1, 3a1 of the ventral side area A of the exterior body 3 and the left and right side edges 3b1, 3b1 of the back side area B of the exterior body 3 to each other. , A waist opening portion WH and a pair of leg opening portions LH, LH are formed. Suitably, as shown in FIG. 2, the exterior body 3 of the diaper 1 is viewed in a plan view in a developed and extended state, and is located in the abdominal region A of the wearer when worn, and worn when worn. It is divided into a dorsal region B arranged on the dorsal side of the person and a crotch region C between the abdominal region A and the dorsal region B.

As described above, the state in which the diaper 1 is expanded and stretched means that the side seal portion S is peeled off to put the diaper 1 in the expanded state, and the diaper 1 in the expanded state is elastic member of each part. Is extended to a design dimension (the same as the dimension when it is expanded in a planar shape with the influence of the elastic member being completely eliminated).

In the present specification, the “skin-facing surface” is a surface of the diaper 1 or its constituent members that faces the wearer's skin side when worn, that is, the side relatively close to the wearer's skin. The “skin-facing surface” is a surface of the diaper 1 or its constituent members that is opposite to the wearer's skin side (clothing side) when worn, that is, a surface relatively facing away from the wearer's skin. In the diaper 1, the longitudinal direction (X direction) is a direction extending from the abdominal region A to the dorsal region B in a state where the diaper 1 is developed and extended on a plane. Further, the lateral direction (Y direction) is a direction orthogonal to the longitudinal direction (X direction), and is the width direction of the diaper 1 in a state where the diaper 1 is expanded and extended in a plane.
Further, the diaper 1 is bilaterally symmetrical with respect to a vertical centerline CL1 extending in the vertical direction (X direction) shown in FIG. It should be noted that CL2 in FIG. 2 is a horizontal center line extending in the horizontal direction (Y direction) that divides the diaper 1 in the vertical direction (X direction), and is orthogonal to the vertical center line CL1.

In the diaper 1, as shown in FIG. 2, the absorbent main body 2 has a vertically long shape in which the longitudinal direction (X direction) is relatively long when the diaper 1 is unfolded and extended. The absorbent main body 2 includes a liquid-permeable topsheet 21 forming a skin-facing surface, a liquid-impermeable (including water-repellent) backsheet 22 forming a non-skin-facing surface, and both sheets 21 and 22. And a liquid-retaining absorber 23 interposed therebetween. In the diaper 1, the absorbent body 23 is formed by coating the absorbent core 231 having the absorbent performance with the liquid-permeable cover sheet 232, and the total length of the absorbent main body 2 in the vertical direction (X direction) is It is the same as that of the absorbent body 23, and the positions of the outer end edges 23A1, 23B1 of the front and rear end portions 23A, 23B of the absorbent body 23 are, as shown in FIG. In the same position as the position. Further, as shown in FIG. 2, on both side portions of the absorbent main body 2 along the vertical direction (X direction), there are leak-proof cuffs 24 having elastic members 25 arranged in a stretched state in the vertical direction (X direction). 24 are provided. Specifically, the leak-proof cuff 24 is made of a liquid-impermeable or water-repellent and breathable material, and the leak-proof cuff-forming elastic member is provided near the free end of each leak-proof cuff 24. 25 are arranged in a state of extending in the vertical direction (X direction). When the diaper is worn, the free end portion side of the leakproof cuff 24 stands up due to the contraction of the leakproof cuff forming elastic member 25, and the body fluid is prevented from flowing out in the lateral direction (Y direction).

As shown in FIG. 2, the absorbent main body 2 configured as described above has its longitudinal direction (X direction) aligned with the longitudinal direction (X direction) of the diaper 1 in the unfolded and stretched state, and the exterior body. It is joined to the central portion of 3 by a main body fixing adhesive. In this way, the exterior body 3 is arranged and adhesively fixed to the non-skin facing surface side of the back sheet 22 that constitutes the absorbent main body 2 in the thickness direction of the disposable diaper 1. Therefore, in the diaper 1, the absorbent body 23 forming the absorbent main body 2 is arranged over the abdominal region A and the dorsal region B.

The back waist flap FB has a stretchable region ST formed by the elastic member 71 arranged in a stretched state in the lateral direction (Y direction). In the diaper 1, as shown in FIGS. The abdominal waist flap FA and the back waist flap FB, which are located outward from the front and rear end portions 23A and 23B in the longitudinal direction X of the body 23 and extend in the lateral direction Y, are in a laterally extended state (Y direction). A stretchable region ST is formed by the elastic member 71 arranged in. Suitably, in the diaper 1, the exterior body 3 is a laminate of an outer layer sheet 6 that forms an outer surface of the diaper 1 when worn, that is, a non-skin-facing surface, and an inner layer sheet 5 that is arranged to face the skin-facing surface of the outer-layer sheet 6. It is composed of the body. When the diaper 1 is worn, the outer layer sheet 6 is located on the side farther from the wearer's skin and forms the non-skin-facing surface (outer surface) of the diaper 1, and the inner layer sheet 5 is more wearable than the outer layer sheet 6. It is located on the side close to the skin and forms the skin facing surface (inner surface) of the diaper 1. The outer layer sheet 6 and the inner layer sheet 5 are bonded to each other at a predetermined portion via a bonding means such as an adhesive, heat sealing, high frequency sealing, or ultrasonic sealing.

In the diaper 1, as shown in FIGS. 2 and 3, the inner layer sheet 5 has an outer end portion 1B in the longitudinal direction X in the back side region B of the diaper 1 only in the back side region B, in other words, a waist opening WH. Is folded back at the folding portion RP located at the peripheral edge of the elastic member 71, and at least one of the folded portions 5E is arranged closer to the wearer's skin than the elastic member 71 arranged in a stretched state in the lateral direction (Y direction). ing. In the diaper 1, one folded-back portion 5E overlaps with the skin-facing surface of the remaining inner layer sheet 5 via the folded-back portion RP. In the diaper 1, the inner layer sheet 5 is formed of a hydrophobic nonwoven fabric made of hydrophobic fibers. As described above, in the diaper 1, the inner layer sheet 5 corresponds to the hydrophobic non-woven fabric made of the hydrophobic fiber that constitutes the back waist flap FB.

In the diaper 1, as shown in FIGS. 2 and 3, the outer layer sheet 6 has an outer edge 5B1 in the longitudinal direction X of the inner layer sheet 5 in the abdominal region A and the dorsal region B (folded portion RP to be described later). Has a folded-back portion 6E of the outer layer that is folded back to the skin facing surface side of the inner layer sheet 5 along the peripheral edge of the waist opening WH, and the folded-back portion 6E of the outer layer is the folded portion 6E of the absorbent body 23. The front and rear ends 23A and 23B in the vertical direction X, that is, the front and rear ends in the vertical direction X of the absorbent body 2 are covered. The folded-back portion 6E of the outer layer and the inner layer sheet 5 (including the folded-back portion 5E on one side) are joined to each other at a predetermined portion via a joining means such as an adhesive, heat seal, high frequency seal, or ultrasonic seal.

As described above, in the diaper 1, as shown in FIG. 2, the exterior body 3 includes the outer layer sheet 6 on the non-skin-facing surface side that forms the outer surface of the diaper 1, the folded-back portion 6E of the outermost layer on the skin-facing surface side, Further, it has an inner layer sheet 5 and an inner layer folded portion 5E arranged between the outer layer sheet 6 and the outer layer folded portion 6E. In the diaper 1, the outer layer sheet 6 and the inner layer sheet 5 excluding the folded-back portion 5E of the inner layer and the folded-back portion 6E of the outer layer are squeezed inward toward the vertical center line CL1 at the central portion in the vertical direction (X direction), and are It has the same shape and size. The folded back portion 5E of the inner layer formed by the folded back portion 5E on one side of the inner layer sheet 5 is formed in the back region B in a rectangular shape that is long in the lateral direction (Y direction). The outer-layer folded-back portion 6E formed by the folded-back portion 6E of the outer-layer sheet 6 is formed in each of the abdominal region A and the back-side region B in a rectangular shape that is long in the lateral direction (Y direction). The folded-back portion 6E of the outer layer, the inner layer sheet 5 and the outer-layer sheet 6 may be separate sheets, but in the diaper 1, the folded-back portion 6E of the outer layer is formed by the folded-back portion of the outer layer sheet 6. .. Thus, in the diaper 1, in the back waist flap FB, the outer layer folded-back portion 6E, the inner layer folded-back portion 5E, the inner layer sheet 5, and the outer layer sheet 6 are arranged from the side closer to the wearer's skin to the side farther away. They are arranged in order. Further, in the diaper 1, in the abdominal waist flap FA, the folded-back portion 6E of the outer layer, the inner layer sheet 5, and the outer layer sheet 6 are arranged in this order from the side closer to the wearer's skin to the side farther.

Moreover, in the diaper 1, as shown in FIG. 2, the exterior body 3 is intermittently stretched in the lateral direction (Y direction) between the inner layer sheet 5 and the outer layer sheet 6 in the longitudinal direction (X direction). It has a plurality of thread-shaped or strip-shaped elastic members 71 arranged in a uniform manner. The diaper 1 includes the plurality of elastic members 71 to form the stretchable region ST having the waist stretchable portion G1 and the waistline lower stretchable portion G2. Further, the diaper 1 has a plurality of stretched thread-shaped or band-shaped leg elastic members 72 between the inner layer sheet 5 and the outer layer sheet 6, as shown in FIG. 2. The diaper 1 includes a plurality of leg elastic members 72 to form the leg stretchable portion G3. As shown in FIG. 2, the leg expansion/contraction part G3 is formed at the peripheral edge of the leg opening LH.

In the diaper 1, the waist elastic part G1 is, as shown in FIG. 2, in the longitudinal direction (X direction) of the front and rear end portions 23A, 23B of the absorbent body 23 constituting the absorbent main body 2 in the longitudinal direction (X direction). The end flaps are formed on the outer side in the vertical direction X with respect to the outer end edges 23A1 and 23B1 (on the side opposite to the horizontal center line CL2 side). Further, in the diaper 1, the waistline lower elastic portion G2 is formed in the side flap located between the lower end of the elastic waist portion G1 on the lateral centerline CL2 side and the lower end of the side seal portion S in the longitudinal direction (X direction). Has been done. The back waist flap FB and the abdominal waist flap FA described above are also regions in which a part of the side flap (lower waist elastic portion G2) is combined with the end flap (waist elastic portion G1).

In the diaper 1, the exterior body 3 has a plurality of joints 8 for joining the inner layer sheet 5 and the outer layer sheet 6, as shown in FIG. 2. In the diaper 1, the back waist flap FB and the abdominal waist flap FA are formed by joining and fixing the inner layer sheet 5 and the outer layer sheet 6 at the joint portions 8 arranged in a scattered manner by heat fusion. Has been done. In the diaper 1, the joint portion 8 between the inner layer sheet 5 and the outer layer sheet 6 is provided in the longitudinal direction (X direction) in the region extending from the waist elastic portion G1 to the waist lower elastic portion G2 in each of the ventral region A and the dorsal region B. Are arranged intermittently so as to form one row along the line, and a plurality of joint portions rows 8L including the plurality of joint portions 8 are arranged in the lateral direction (Y direction) at intervals.

As shown in FIG. 2, the diaper 1 is arranged between the inner layer sheet 5 and the outer layer sheet 6 fixed at the joint portion 8 in a state of being stretched in the lateral direction (Y direction) and in the longitudinal direction (X direction). It has a plurality of elastic members 71 arranged intermittently. Suitably, in the diaper 1, a plurality of elastic members 71 are respectively provided in a region extending from the waist elastic portion G1 to the waist lower elastic portion G2 in each of the abdominal region A and the dorsal region B, and the plurality of joint portion rows 8L, respectively. They are arranged in a stretched state in the lateral direction (Y direction) through the gap between the joint portions 8 of each other.

In the diaper 1, as shown in FIG. 2, the inner layer sheet 5 is provided on both side edge portions 3a1 and 3a1 of the ventral side area A of the exterior body 3 and both side edge portions 3b1 and 3b1 of the back side area B of the exterior body 3. The outer layer sheet 6 has a pair of outer fixing regions 3T1 and 3T1 joined together via an elastic member fixing adhesive, and the vicinity of both sides of the absorbent main body 2 along the longitudinal direction (X direction). In addition, the inner layer sheet 5 and the outer layer sheet 6 have a pair of main body side fixing regions 3T2 and 3T2 joined to each other via an elastic member fixing adhesive.

In the waist elastic part G1 of the diaper 1, as shown in FIG. 2, a plurality of elastic members 71 are arranged over a pair of outer fixing regions 3T1 and 3T1. While being fixed between the inner layer sheet 5 and the outer layer sheet 6 in each of the outer fixing regions 3T1 and 3T1, it is fixed to both the inner layer sheet 5 and the outer layer sheet 6 between the pair of outer fixing regions 3T1 and 3T1. It has not been. More specifically, in the waist elastic part G1 of the diaper 1, a plurality of elastic members 71 are arranged over a pair of outer fixing regions 3T1 and 3T1, and the elastic members 71 are arranged in a pair of outer fixing regions. In each of 3T1 and 3T1, while being fixed between a hydrophilic short-side portion 4TS formed on the inner layer sheet 5 and an outer layer sheet 6 described later, a pair of outer fixing regions 3T1, including a central region in the lateral direction Y, are formed. Between 3T1, it is not fixed to any of hydrophilic short-sided portions 4TS described later formed on the inner layer sheet 5 and the outer layer sheet 6.

In the lower waist elastic part G2 of the diaper 1, as shown in FIG. 2, a plurality of elastic members 71 are arranged between the outer fixing region 3T1 and the main body side fixing region 3T2. The elastic member 71 is fixed between the inner layer sheet 5 and the outer layer sheet 6 in each of the outer fixing region 3T1 and the main body side fixing region 3T2, while it is between the outer fixing region 3T1 and the main body side fixing region 3T2. In the above, it is not fixed to either the inner layer sheet 5 or the outer layer sheet 6. In the lower waistline elastic part G2 of the diaper 1, the elastic member 71 is not arranged between the pair of main body side fixing regions 3T2 and 3T2, or the elastic member 71 is finely arranged so as not to exhibit elastic elasticity. It is placed in a state where it has been subjected to processing such as division.

In the leg expansion/contraction part G3 of the diaper 1, as shown in FIG. 2, a plurality of leg elastic members 72 arranged in a stretched state on the peripheral edge of the leg opening LH have a planar shape on the peripheral edge of the leg opening LH. It is fixed between the inner layer sheet 5 and the outer layer sheet 6 via an elastic member fixing adhesive disposed in the.

In the exterior body 3 of the diaper 1, as shown in FIGS. 1 and 2, in the waist elastic portion G1 and the lower waist elastic portion G2, the inner layer sheet 5 and the outer layer sheet 6 are stretched in the lateral direction (Y direction). By contraction of the plurality of elastic members 71 arranged in the vertical direction (X direction) and intermittently arranged in the vertical direction (X direction), the outer layer sheet 6 between the joint portion rows 8L and 8L adjacent to each other in the horizontal direction (Y direction) is outside. The gather portion is formed by deforming so as to bulge inward, and deforming so that the folded-back portion 6E of the outer layer and the inner layer sheet 5 bulge inward. As described above, in the central region in the lateral direction Y, the elastic member 71 is not fixed to the hydrophilic short section 4TS formed on the inner layer sheet 5, which will be described later, and thus is deformed so as to bulge inward. The space absorbed facilitates evaporation of sweat absorbed in the hydrophilic short-length portion 4TS.

The back waist flap FB has a nonwoven fabric provided with hydrophilic regions 4T made of hydrophilic fibers in the stretchable region ST. In the diaper 1, the back waist flap FB has a structure in the stretchable region ST. As the non-woven fabric, an inner layer sheet 5 made of a hydrophobic non-woven fabric made of hydrophobic fibers is formed. The inner layer sheet 5 is formed of hydrophilic fibers by applying a hydrophilizing agent over the entire length in the lateral direction Y. And a hydrophilic region 4T. As described above, in the diaper 1, the hydrophilic region 4T is not formed of a non-woven fabric separate from the hydrophobic non-woven fabric (inner layer sheet 5), but the entire region of the hydrophobic non-woven fabric (inner layer sheet 5) made of hydrophobic fibers. Is a region formed by applying a hydrophilizing agent to a part of. In the back side waist flap FB of the diaper 1, the hydrophilic region 4T is close to the wearer's skin and constitutes the back side waist flap FB in the lateral direction of the inner layer sheet 5 formed of a hydrophobic nonwoven fabric ( The hydrophilic agent is applied to a part of the inner layer sheet 5 over the entire length in the (Y direction).

In the diaper 1, as shown in FIG. 2, a hydrophilic region 4T capable of absorbing sweat is arranged in the stretchable region ST of the back waist flap FB. In the diaper 1, the hydrophilic hydrophilic region 4T is arranged in the stretchable region ST of the back waist flap FB, that is, a region in which the waist stretchable portion G1 and a part of the waistline lower stretchable portion G2 are combined.

As described above, in the diaper 1, as shown in FIGS. 2 and 3, the inner layer sheet 5 that is a nonwoven fabric having the hydrophilic region 4T has the outer end portion 1B in the longitudinal direction X in the back side region B of the diaper 1, In other words, while being folded back at the folded portion RP located at the peripheral edge of the waist opening WH, the hydrophilic region 4T is folded back at the folded portion RP, and as shown in FIG. The hydrophilic region 4T of the inner layer sheet 5) straddles the folded portion RP so that the side closer to the wearer's skin is longer in the longitudinal direction (X direction). Then, in the diaper 1, the hydrophilic region 4T of the inner layer sheet 5 is arranged on the side close to the wearer's skin, and the hydrophilic elongated portion 4TL extending in the longitudinal direction (X direction) from the folded portion RP, The hydrophilic long portion 4TL is arranged on the side far from the wearer's skin and is divided into the hydrophilic short portion 4TS which is shorter than the hydrophilic long portion 4TL in the longitudinal direction (X direction). In the diaper 1, the hydrophilic long portion 4TL and the hydrophilic short portion 4TS are arranged on the side closer to the wearer's skin than the elastic member 71. Then, the hydrophilic long portion 4TL is arranged closer to the wearer's skin than the hydrophilic short portion 4TS. Further, in the diaper 1, the hydrophilic long portion 4TL and the hydrophilic short portion 4TS are overlapped so as to abut each other.

As the hydrophilizing agent forming the hydrophilic region 4T, a known hydrophilizing agent used for absorbent articles such as disposable diapers can be used. In the diaper 1, the hydrophilic region 4T is formed only on the back waist flap FB, but it may be formed on the back waist flap FB and the abdominal waist flap FA. Thus, when the hydrophilic region 4T is formed on the back waist flap FB and the abdominal waist flap FA, the basis weight of the hydrophilizing agent applied to the skin side nonwoven fabric (for example, the inner layer sheet 5) is The side waist flap FA side and the back side waist flap FB side preferably have the same amount, and the degree of hydrophilicity of the hydrophilic region 4T on the abdominal waist flap FA side and the hydrophilic region 4T on the back side waist flap FB side. It is preferred that the hydrophilicity levels of are the same.

In the diaper 1, from the viewpoint of absorbing a large amount of sweat on the back side of the wearer when worn, the vertical direction of the hydrophilic elongated portion 4TL with respect to the length (L1) in the vertical direction (X direction) of the folded-back portion 5E of the inner layer ( The ratio ((L2/L1)×100) of the length (L2) in the X direction is preferably 80% or more, more preferably 90% or more, and the upper limit is 100%. The lengths (L1) and (L2) are lengths in a state where the diaper 1 is expanded and stretched. From the viewpoint of preventing the body fluid absorbed in the absorbent body 23 from migrating, the hydrophilic elongated portion 4TL does not extend to the inner end portion of the folded-back portion 5E of the inner layer on the crotch region C side, and the inner end portion does not extend to the inner end portion. Preferably has a hydrophobic region composed of hydrophobic constituent fibers.

The hydrophilic long portion 4TL has only to be longer than the hydrophilic short portion 4TS in the longitudinal direction X. For example, the entire folded portion 5E of the inner layer may be the hydrophilic long portion 4TL. .. When the entire folded back portion 5E of the inner layer is the hydrophilic elongated portion 4TL, the inner end portion of the folded back portion 5E of the inner layer on the crotch region C side does not allow the body fluid absorbed by the absorbent body 23 to migrate. It is preferable that the absorbent body 23 does not extend to a position in contact with the rear end portion 23B in the vertical direction X. That is, it is preferable that the inner end portion of the folded-back portion 5E of the inner layer on the crotch region C side and the rear end portion 23B of the absorbent body 23 in the vertical direction X be spaced from each other.

Further, in the diaper 1, from the viewpoint of absorbing a large amount of sweat on the back side of the wearer when the wearer wears the hydrophilic short portion 4TS with respect to the length (L2) in the longitudinal direction (X direction) of the hydrophilic long portion 4TL. The ratio ((L3/L2)×100) of the length (L3) in the longitudinal direction (X direction) is preferably 3% or more, more preferably 5% or more, and 80% or less. It is preferable that it is 70% or less, more preferably 3% or more and 80% or less, and further preferably 5% or more and 70% or less. The length (L3) is a length in a state where the diaper 1 is expanded and stretched.

Suitably, the length (L1) in the longitudinal direction (X direction) of the folded-back portion 5E of the inner layer is preferably 20 mm or more, more preferably 30 mm or more, and preferably 120 mm or less, It is more preferably 100 mm or less, specifically 20 mm or more and 120 mm or less, and further preferably 30 mm or more and 100 mm or less.
The length (L2) in the longitudinal direction (X direction) of the hydrophilic elongated portion 4TL is preferably 20 mm or more, more preferably 30 mm or more, and preferably 100 mm or less, 90 mm or less. Is more preferable, and specifically, it is preferably 20 mm or more and 100 mm or less, and more preferably 30 mm or more and 90 mm or less.
The length (L3) in the vertical direction (X direction) of the hydrophilic short section 4TS is preferably 1 mm or more, more preferably 2 mm or more, and preferably 80 mm or less, 60 mm or less. Is more preferable, and specifically, it is preferably 1 mm or more and 80 mm or less, and more preferably 2 mm or more and 60 mm or less.

In the diaper 1, as shown in FIG. 3, the elastic member 71 has a region where the hydrophilic long portion 4TL and the hydrophilic short portion 4TS overlap each other, in other words, a region corresponding to the hydrophilic short portion 4TS. In addition, it is preferable to have at least one thread-shaped (including plate-shaped) elastic member. When such a thread-like elastic member is provided, it is difficult for the densification of fibers due to the contraction of the elastic members to occur in the overlapping region, so that the diaper 1 is positioned at the peripheral portion of the waist opening WH during wearing. Sweat absorbed in the hydrophilic region 4T can be easily transferred to the folded-back portion RP side, and evaporation of sweat from the peripheral portion of the waist opening WH can be promoted.

The material for forming each part of the diaper 1 described above will be described.
In the diaper 1, since the folded back portion 5E of the inner layer forming the exterior body 3 is formed by the folded back portion 5E of the inner layer sheet 5, the entire inner layer sheet 5 including the folded back portion 5E of the inner layer is made of hydrophobic fibers. It is made of a hydrophobic sheet. Moreover, in the diaper 1, since the folded-back portion 6E of the outer layer forming the exterior body 3 is formed by the folded-back portion 6E of the outer-layer sheet 6, the entire outer-layer sheet 6 including the folded-back portion 6E of the outer layer is made of hydrophobic fiber. It is formed of a structured hydrophobic sheet.

Examples of the hydrophobic fiber that constitutes the hydrophobic sheet used for the inner layer sheet 5 (the inner layer folded-back portion 5E) and the outer layer sheet 6 (including the outer layer folded-back portion 6E) include thermoplastic synthetic fibers. As the constituent fiber of various non-woven fabrics, those commonly used can be used, for example, polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers; thermoplastic resins such as polyethylene terephthalate (PET) and polyamide. Fibers obtained by independently using the above; composite fibers having a core-sheath type, a side-by-side type, or the like.

The hydrophilizing agent forming the hydrophilic region 4T is not particularly limited as long as it is a general hydrophilizing agent used for hygiene products. The determination of whether the fibers forming the hydrophilic region 4T are hydrophilic or hydrophobic is made based on the contact angles of the constituent fibers measured in [Method for measuring the contact angle of fibers] described below. Specifically, if the contact angle is 90° or more, it is determined that the hydrophilicity is low, and if the contact angle is smaller than 90°, the hydrophilicity is determined to be high.

[Method of measuring contact angle of fiber]
For the measurement of the contact angle, for example, a contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Specifically, ion-exchanged water is dropped (about 20 picoliters) on the surface of the fiber forming the hydrophilic region 4T, and then the contact angle is immediately measured using the contact angle meter. The measurement is carried out at 5 or more points of the fibers forming the hydrophilic region 4T, and the average value thereof is taken as the contact angle. The measurement environment temperature is 20°C.

As the topsheet 21, the backsheet 22, the absorbent body 23, the leak-proof cuff 24, etc., which compose the absorbent main body 2, various materials conventionally used for absorbent articles such as disposable diapers should be used without particular limitation. You can For example, as the topsheet 21, a non-woven fabric having a single-layer or multi-layer structure, a perforated film, or the like can be used. A moisture-permeable resin film or the like can be used as the back sheet 22. The absorbent core 231 of the absorbent body 23 may be made of absorbent polymer particles and a fibrous material, and the covering sheet 232 of the absorbent body 23 may be tissue paper, non-woven fabric, or the like. .. Further, as the leak-proof cuff 24, a water-repellent non-woven fabric having a single-layer or multi-layer structure can be used.

Examples of the elastic member (the elastic member 25 for forming the leak-proof cuff, the elastic member 71, the leg elastic member 72, etc.) are synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, Examples thereof include polyurethane. As a form of the elastic member, a thread-shaped (thread rubber or the like) having a rectangular, square, circular, elliptical, or polygonal cross section, or a string-shaped (flat rubber or the like) or the like can be preferably used.

Elastic member fixing adhesive for fixing the elastic member (leakproof cuff forming elastic member 25, elastic member 71, leg elastic member 72, etc.), and main body fixing adhesive for fixing the exterior body 3, the absorbent main body 2, etc. As the above, various hot melt adhesives and the like that have been conventionally used for absorbent articles such as disposable diapers can be used without particular limitation.

The operation and effect when the diaper 1 according to the embodiment of the present invention described above is used will be described.
In the diaper 1, as shown in FIG. 2 and FIG. 3, in the stretchable region ST of the back waist flap FB, the inner layer sheet 5 which is a nonwoven fabric forming the back waist flap FB has a hydrophilic region 4T capable of absorbing sweat. Are arranged. Then, as shown in FIGS. 2 and 3, the inner layer sheet 5 having the hydrophilic region 4T is folded back at the folding portion RP, and the folded portion 5E is elastically arranged in a laterally (Y direction) stretched state. The hydrophilic region 4T is arranged closer to the wearer's skin than the member 71, and the hydrophilic region 4T is arranged across the folded-back portion RP so that the side closer to the wearer's skin becomes longer in the vertical direction (X direction). There is. When the hydrophilic region 4T is arranged so as to straddle the folded portion RP in this manner, the sweat absorbed in the dense folded portion RP where the hydrophilic long portion 4TL and the hydrophilic short portion 4TS overlap with each other moves. Easy, sweat easily evaporates from the peripheral edge of the waist opening WH where the folded-back portion RP is located, the stuffy feeling when wearing a pants-type disposable diaper can be suppressed, and skin troubles such as eczema, sweaty rash and rash are reduced. Can be expected.

Particularly, in the diaper 1, the hydrophilic region 4T is not formed of a non-woven fabric separate from the hydrophobic non-woven fabric (inner layer sheet 5), but is formed in a part of the hydrophobic non-woven fabric (inner layer sheet 5) made of hydrophobic fibers. , Is formed by applying a hydrophilizing agent. As described above, since no separate hydrophilic sheet other than the inner layer sheet 5 and the outer layer sheet 6 is used, the rigidity of the stretchable region ST of the back waist flap FB is unlikely to be high while the diaper 1 is worn, and the separate hydrophilic sheet is not used. Since the edges of the hydrophilic sheet do not irritate the wearer's skin, redness of the skin is unlikely to develop, and it can be expected to reduce skin troubles such as eczema, eczema, and rashes.

From the viewpoint of more reliably producing the above effects, the diaper 1 preferably has one or more of the following configurations.

In the diaper 1, as shown in FIG. 3, the hydrophilic long-side portion 4TL and the hydrophilic short-side portion 4TS are preferably not fixed to each other at the folded-back portion RP by an adhesive or heat fusion. Unless the hydrophilic long portion 4TL and the hydrophilic short portion 4TS are fixed at least at the folded portion RP, the surface area of the hydrophilic region 4T where sweat evaporates can be secured, and the hydrophilic long portion at the folded portion RP can be secured. The evaporation of sweat from the skin-facing surface and the non-skin-facing surface of each of the 4TL and the hydrophilic short section 4TS can be promoted.

In the diaper 1, as shown in FIG. 3, the hydrophilic long-side portion 4TL and the hydrophilic short-side portion 4TS are not fixed to each other by an adhesive or heat fusion throughout the hydrophilic short-side portion 4TS. Is preferred. If the hydrophilic long portion 4TL and the hydrophilic short portion 4TS are not fixed over the entire hydrophilic short portion 4TS, the surface area of the hydrophilic region 4T where sweat evaporates can be secured, and the hydrophilicity at the folded portion RP can be ensured. It is possible to promote evaporation of sweat from the skin-facing surface and the non-skin-facing surface of each of the long dimension portion 4TL and the hydrophilic short dimension portion 4TS.

Further, as the non-woven fabric constituting the back waist flap FB, in addition to the inner layer sheet 5 (the folded portion 5E of the inner layer) made of the hydrophobic non-woven fabric having the hydrophilic region 4T, as the second hydrophobic non-woven fabric made of the hydrophobic fiber. , The outer layer sheet 6 (including the folded-back portion 6E of the outer layer). In the diaper 1, as the nonwoven fabric constituting the back waist flap FB, in addition to the inner layer sheet 5 (the folded portion 5E of the inner layer) made of the hydrophobic nonwoven fabric having the hydrophilic region 4T, the first layer made of a separate hydrophobic fiber is used. 2 As the hydrophobic non-woven fabric, it has an outer layer sheet 6 (including a folded-back portion 6E of the outer layer). The folded-back portion 6E of the outer layer is arranged closer to the wearer's skin than the hydrophilic elongated portion 4TL, as shown in FIG. In such a case, it is preferable that the folded-back portion 6E of the outer layer covers the entire area of the hydrophilic elongated portion 4TL. When the folded-back portion 6E of the outer layer covers the entire hydrophilic elongated portion 4TL in this way, the sweat absorbed in the hydrophilic region 4T is transferred to the wearer's skin by the folded-back portion 6E of the hydrophobic outer layer. Can be prevented.

In addition, from the viewpoint that the hydrophilic region 4T easily absorbs sweat through the folded-back portion 6E of the outer layer, the hydrophilic long portion 4TL and the folded-back portion 6E of the outer layer made of the hydrophobic non-woven fabric are the same as the hydrophilic long portion 4TL. It is preferable that they are fixed by the heat-sealing portion arranged. That is, the hydrophilic long hydrophilic portion 4TL formed on the folded portion 5E of the inner layer and the folded folded portion 6E of the hydrophobic outer layer are formed on the hydrophilic region 4T by a plurality of heat spots arranged in a scattered manner. It is preferable that they are fixed at a joint portion (heat fusion portion) formed by fusion. Such a heat-sealed portion can be formed by using various known methods such as heat sealing, ultrasonic sealing, and high frequency sealing.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above-described embodiments and can be modified as appropriate. In the disposable diaper of another embodiment shown below, the same parts as those of the diaper 1 shown in FIG.

For example, the diaper 1 described above has an inner layer sheet 5, an inner layer folded portion 5E, an outer layer sheet 6 and an outer layer folded portion 6E as a nonwoven fabric forming the back waist flap FB, as shown in FIG. However, as in the diaper 1 shown in FIG. 4, in addition to the inner layer sheet 5 and the outer layer sheet 6, a hydrophobic nonwoven fabric 9 made of a separate hydrophobic fiber may be included. Specifically, in the diaper 1 shown in FIG. 4, the separate hydrophobic non-woven fabric 9 is arranged between the folded-back portion 6E of the outer layer and the inner layer sheet 5, and the hydrophilic region 4T is formed of the separate hydrophobic material. The entire area of the non-woven fabric 9 is formed by applying a hydrophilizing agent. Therefore, both the one folded portion 91 and the other folded portion 92 are arranged closer to the wearer's skin than the elastic member 71. Therefore, in the diaper 1 shown in FIG. 4, similar to the diaper 1 shown in FIG. 3, the hydrophilic long-side portion 4TL and the hydrophilic short-side portion 4TS are located closer to the wearer's skin than the elastic member 71, respectively. It is distributed. Then, the hydrophilic long portion 4TL is arranged closer to the wearer's skin than the hydrophilic short portion 4TS. Further, in the diaper 1, the hydrophilic long portion 4TL and the hydrophilic short portion 4TS are overlapped so as to contact each other. According to the diaper 1 shown in FIG. 4, the same effect as that of the diaper 1 shown in FIG. 3 is obtained, and particularly, since the hydrophilic region 4T is formed over the entire area of the separate hydrophobic nonwoven fabric 9, the lateral side of the diaper 1 is improved. It is easy to freely adjust the length of the sweat absorbing area in the direction Y. The inner end of the hydrophilic elongated portion 4TL formed on one of the folded-back portions 91 on the crotch region C side and the rear end 23B of the absorbent body 23 in the longitudinal direction X are absorbed by the absorbent body 23. From the viewpoint of preventing the transfer of body fluid, it is preferable that they are arranged at intervals.

Further, as shown in FIG. 3, the diaper 1 described above has an inner layer sheet 5, an inner layer folded portion 5E, an outer layer sheet 6 and an outer layer folded portion 6E as a nonwoven fabric that constitutes the back waist flap FB. However, as in the diaper 1 shown in FIG. 5, in addition to the inner layer sheet 5 and the outer layer sheet 6, a separate non-woven fabric sheet 90 may be provided. Specifically, in the diaper 1 shown in FIG. 5, the separate sheet 90 sandwiches the inner layer sheet 5 and the outer layer sheet 6 so that the outer end portion 1B in the longitudinal direction X in the back side region B of the diaper 1, in other words, the waist. It is folded back at the folded portion RP located at the peripheral edge of the opening portion WH, and one folded portion 910 is closer to the wearer's skin than the elastic member 71 arranged in a laterally (Y direction) stretched state. The inner layer sheet 5 is disposed on the skin-facing surface. The other folded-back portion 920 is arranged on the side farther from the elastic member 71 to the wearer's skin, and is arranged on the non-skin-facing surface of the outer layer sheet 6. The hydrophilic region 4T is formed by applying a hydrophilizing agent to the entire area of the separate sheet 90. Therefore, in the diaper 1 shown in FIG. 5, the hydrophilic long portion 4TL is arranged closer to the wearer's skin than the elastic member 71, and the hydrophilic short portion 4TS is closer to the wearer's skin than the elastic member 71. The elastic member 71 is disposed on the far side, and the long hydrophilic portion 4TL and the short hydrophilic portion 4TS sandwich the elastic member 71. In this way, the hydrophilic long portion 4TL is arranged closer to the wearer's skin than the hydrophilic short portion 4TS. According to the diaper 1 shown in FIG. 5, the same effect as that of the diaper 1 shown in FIG. 3 is obtained, and in particular, since the elastic long portion 4TL and the hydrophilic short portion 4TS sandwich the elastic member 71, the elasticity is improved. Due to the interposition of the member 71, the hydrophilic long portion 4TL and the hydrophilic short portion 4TS are easily separated from each other, and the hydrophilic long portion 4TL and the hydrophilic short portion 4TS from the skin-facing surface and the non-skin-facing surface, respectively. It can promote evaporation of sweat. The inner end of the hydrophilic elongated portion 4TL formed on one of the folded portions 910 on the crotch region C side and the rear end 23B of the absorbent body 23 in the longitudinal direction X are absorbed by the absorbent body 23. From the viewpoint of preventing the transfer of body fluid, it is preferable that they are arranged at intervals.

Further, in the diaper 1 shown in FIG. 5, if the inner layer sheet 5 and the outer layer sheet 6 are formed of a hydrophobic non-woven fabric made of hydrophobic fibers, the non-woven fabric forming the back waist flap FB has a hydrophilic region 4T. In addition to the separate sheet 90 provided with, the inner layer sheet 5 and the outer layer sheet 6 are provided as a hydrophobic nonwoven fabric. According to the diaper 1 shown in FIG. 5, the hydrophilic long portion 4TL and the hydrophilic short portion 4TS sandwich the inner layer sheet 5 and the outer layer sheet 6 made of a hydrophobic nonwoven fabric. The hydrophilic long portion 4TL and the hydrophilic short portion 4TS are separated from each other to promote evaporation of sweat from the skin-facing surface and the non-skin facing surface of the hydrophilic long portion 4TL and the hydrophilic short portion 4TS, respectively. You can

Further, in the diaper 1 shown in FIG. 5, as the separate sheet 90, a laminated sheet of a hydrophilic nonwoven fabric made of hydrophilic fibers and a hydrophobic nonwoven fabric made of hydrophobic fibers may be used. When such a laminated sheet is used as the separate sheet 90, the hydrophobic nonwoven fabric is arranged on the skin-facing surface of the hydrophilic nonwoven fabric in one folded portion 910, and the non-skin-facing of the hydrophilic nonwoven fabric is arranged in the other folded portion 920. It is preferable that the hydrophobic non-woven fabric is laminated on the surface. In this way, when the hydrophobic nonwoven fabric is arranged on the skin-facing surface of the hydrophilic nonwoven fabric in one of the folded portions 910, the sweat absorbed by the hydrophilic nonwoven fabric is transferred to the wearer's skin by the hydrophobic nonwoven fabric. Can be prevented. From the viewpoint that the hydrophilic nonwoven fabric easily absorbs sweat through the hydrophobic nonwoven fabric covering the hydrophilic nonwoven fabric, the hydrophilic nonwoven fabric and the hydrophobic nonwoven fabric are fixed by the heat-sealing portion arranged on the hydrophilic nonwoven fabric. Preferably. The hydrophilic non-woven fabric and the hydrophobic non-woven fabric are preferably hydrophilic non-woven fabrics and are fixed to each other at a plurality of spliced heat-bonding joints (heat-sealing portions). Such a heat-sealed portion can be formed by using various known methods such as heat sealing, ultrasonic sealing, and high frequency sealing.

Further, as shown in FIG. 3, the diaper 1 described above has an inner layer sheet 5, an inner layer folded portion 5E, an outer layer sheet 6 and an outer layer folded portion 6E as a nonwoven fabric forming the back waist flap FB. Although the hydrophilic region 4T is formed in a part of the inner layer sheet 5 and the folded portion 5E of the inner layer, as in the diaper 1 shown in FIG. 6, the hydrophilic portion 4T is hydrophilic in a part of the outer sheet 6 and the folded portion 6E of the outer layer. The region 4T may be formed. In the diaper 1 shown in FIG. 6, the inner layer sheet 5 and the outer layer sheet 6 are formed of a hydrophobic nonwoven fabric, and a hydrophilic agent is applied to a part of the outer layer sheet 6 to form the hydrophilic region 4T. The hydrophilic region 4T of the hydrophobic nonwoven fabric (outer layer sheet 6) straddles the folded portion RP so that the side closer to the wearer's skin becomes longer in the vertical direction (X direction). In the diaper 1 shown in FIG. 6, the hydrophilic region 4T of the outer layer sheet 6 is disposed on the side close to the wearer's skin and has a long hydrophilic portion 4TL extending in the longitudinal direction (X direction) from the folded portion RP. And a hydrophilic short portion 4TS shorter in the longitudinal direction (X direction) than the hydrophilic long portion 4TL.

In the diaper 1 shown in FIG. 6, the hydrophilic long portion 4TL is arranged closer to the wearer's skin than the elastic member 71, and the hydrophilic short portion 4TS is farther from the elastic member 71 to the wearer's skin. And the hydrophilic long portion 4TL and the hydrophilic short portion 4TS sandwich the elastic member 71. In this way, the hydrophilic long portion 4TL is arranged closer to the wearer's skin than the hydrophilic short portion 4TS. According to the diaper 1 shown in FIG. 6, the same effect as that of the diaper 1 shown in FIG. 3 is obtained, and in particular, the elastic long member 4TL and the hydrophilic short member 4TS sandwich the elastic member 71. Due to the interposition of the member 71, the hydrophilic long portion 4TL and the hydrophilic short portion 4TS are easily separated from each other, and the hydrophilic long portion 4TL and the hydrophilic short portion 4TS from the skin-facing surface and the non-skin-facing surface, respectively. It can promote evaporation of sweat. The inner end of the hydrophilic elongated portion 4TL formed on the folded-back portion 6E of the outer layer on the crotch region C side and the rear end 23B of the absorbent body 23 in the longitudinal direction X are absorbed by the absorbent body 23. From the viewpoint of preventing the transfer of body fluid, it is preferable that they are arranged at intervals.

Further, in the diaper 1 shown in FIG. 6, since the inner layer sheet 5 is also formed of a hydrophobic non-woven fabric made of hydrophobic fibers, the non-woven fabric forming the back waist flap FB has a hydrophobic region including the hydrophilic region 4T. In addition to the outer layer sheet 6 made of a nonwoven fabric, the inner layer sheet 5 made of a hydrophobic nonwoven fabric is provided. According to the diaper 1 shown in FIG. 6, since the hydrophilic long-side portion 4TL and the hydrophilic short-side portion 4TS sandwich the inner layer sheet 5 made of the hydrophobic non-woven fabric, the hydrophilic long-sized portion is interposed by the hydrophobic non-woven fabric. The portion 4TL and the short hydrophilic portion 4TS are separated from each other, and evaporation of sweat from the skin-facing surface and the non-skin facing surface of the hydrophilic long portion 4TL and the hydrophilic short portion 4TS can be promoted. In the diaper 1 shown in FIG. 6, from the viewpoint of further separating the hydrophilic long-side portion 4TL and the hydrophilic short-side portion 4TS, the inner layer sheet 5 is outside the longitudinal direction X in the back side region B of the diaper 1. It may have a form having a folded-back portion 5E folded at the folded-back portion RP located at the end portion 1B.

Further, as shown in FIG. 3, the diaper 1 described above has an inner layer sheet 5, an inner layer folded portion 5E, an outer layer sheet 6 and an outer layer folded portion 6E as a nonwoven fabric forming the back waist flap FB. Although the hydrophilic region 4T is formed in a part of the inner layer sheet 5 and the folded portion 5E of the inner layer, the inner layer sheet 5 is formed by the folded portion 6E of the outer layer of the outer layer sheet 6 as in the diaper 1 shown in FIG. Alternatively, the hydrophilic region 4T may be formed on the outer layer sheet 6 and a part of the outer layer folded-back portion 6E. In the diaper 1 shown in FIG. 7, the outer layer sheet 6 is formed of a hydrophobic nonwoven fabric, and a hydrophilic agent is applied to a part of the outer layer sheet 6 to form the hydrophilic region 4T. The hydrophilic region 4T of the hydrophobic nonwoven fabric (outer layer sheet 6) straddles the folded portion RP so that the side closer to the wearer's skin becomes longer in the vertical direction (X direction). In the diaper 1 shown in FIG. 7, the hydrophilic region 4T is arranged on the side close to the wearer's skin and has a hydrophilic long portion 4TL that extends long in the vertical direction (X direction) from the folded portion RP, and is hydrophilic. The hydrophilic short section 4TS is shorter than the long section 4TL in the vertical direction (X direction). In the diaper 1 shown in FIG. 7 as described above, the inner layer sheet 5 is formed by the folded-back portion 6E of the outer layer of the outer layer sheet 6, and the number of constituent members is small. Can be suppressed.

In the diaper 1 shown in FIG. 7, the hydrophilic long portion 4TL is arranged closer to the wearer's skin than the elastic member 71, and the hydrophilic short portion 4TS is farther from the elastic member 71 to the wearer's skin. And the hydrophilic long portion 4TL and the hydrophilic short portion 4TS sandwich the elastic member 71. In this way, the hydrophilic long portion 4TL is arranged closer to the wearer's skin than the hydrophilic short portion 4TS. According to the diaper 1 shown in FIG. 7, the same effect as that of the diaper 1 shown in FIG. 3 is obtained, and in particular, since the elastic long member 4TL and the hydrophilic short member 4TS sandwich the elastic member 71, the elasticity is improved. Due to the interposition of the member 71, the hydrophilic long portion 4TL and the hydrophilic short portion 4TS are easily separated from each other, and the hydrophilic long portion 4TL and the hydrophilic short portion 4TS from the skin-facing surface and the non-skin-facing surface, respectively. It can promote evaporation of sweat. The inner end of the hydrophilic elongated portion 4TL formed on the folded-back portion 6E of the outer layer on the crotch region C side and the rear end 23B of the absorbent body 23 in the longitudinal direction X are absorbed by the absorbent body 23. From the viewpoint of preventing the transfer of body fluid, it is preferable that they are arranged at intervals.

Further, as shown in FIG. 3, the diaper 1 described above has an inner layer sheet 5, an inner layer folded portion 5E, an outer layer sheet 6 and an outer layer folded portion 6E as a nonwoven fabric forming the back waist flap FB. Although the hydrophilic region 4T is formed in a part of the inner layer sheet 5 and the folded back portion 5E of the inner layer, the diaper 1 shown in FIG. 8 may not have the folded back portion 6E of the outer layer. .. In the diaper 1 shown in FIG. 8, the folded-back portion 5E of the inner layer of the inner layer sheet 5 covers the rear end portion 23B of the absorbent body 23 in the vertical direction X, that is, the end portion of the absorbent main body 2 in the vertical direction X. .. The hydrophilic region 4T of the hydrophobic nonwoven fabric (inner layer sheet 5) straddles the folded portion RP so that the side closer to the wearer's skin becomes longer in the vertical direction (X direction). In the diaper 1 shown in FIG. 8, the hydrophilic region 4T is arranged on the side close to the wearer's skin and has a hydrophilic long portion 4TL that extends long in the longitudinal direction (X direction) from the folded portion RP, and is hydrophilic. The hydrophilic short section 4TS is shorter than the long section 4TL in the vertical direction (X direction).

In the diaper 1 shown in FIG. 8, the hydrophilic long section 4TL and the hydrophilic short section 4TS are arranged closer to the wearer's skin than the elastic member 71, and the hydrophilic long section 4TL has a hydrophilic short section. It is arranged closer to the wearer's skin than the section 4TS. Further, in the diaper 1, the back waist flap FB and the abdominal waist flap FA are joined and fixed by the inner layer sheet 5 and the outer layer sheet 6 at the joint portions 8 arranged in a scattered manner by heat fusion. Is formed between the inner layer sheet 5 and the outer layer sheet 6 fixed at the joint portion 8 in a state of being stretched in the lateral direction (Y direction) and intermittently arranged in the longitudinal direction (X direction). It has a plurality of elastic members 71. According to the diaper 1 shown in FIG. 8, the same effect as that of the diaper 1 shown in FIG. 3 is obtained, and (1) the hydrophilic region 4T is formed in a part of the inner layer sheet 5 and the folded-back portion 5E of the inner layer. , (2) The space between the inner layer sheet 5 and the outer layer sheet 6 is released at the waist opening WH, and (3) there is a space between the nonwoven fabrics forming the back waist flap FB when the elastic member 71 is contracted. In addition, sweat that has absorbed sweat easily evaporates. The inner end of the hydrophilic elongated portion 4TL formed on the folded-back portion 5E of the inner layer on the crotch region C side and the rear end 23B of the absorber 23 in the longitudinal direction X are absorbed by the absorber 23. From the viewpoint of preventing the transfer of body fluid, it is preferable that they are arranged at intervals.

The absorbent article of the present invention is not limited to the diaper 1 of FIGS. 3 to 8 described above, and can be appropriately modified. Further, the respective constituent elements of the diaper 1 shown in FIGS. 3 to 8 can be appropriately combined and implemented within a range not impairing the gist of the present invention.

Further, in the diaper 1 described above, as shown in FIG. 3, the elastic members 71 are all thread-like (including band-like) elastic members, but are made of a film-like or elastic fiber layer-like elastic member made of elastic fibers. It may have been done.

In the disposable diaper 1 described above, as shown in FIG. 2, only the back waist flap FB is provided with the hydrophilic region 4T in which the hydrophilic region is applied to the stretchable region ST. The side waist flap FA may also be provided with the hydrophilic region 4T.

Further, in the above-mentioned disposable diaper 1, as shown in FIG. 2, the exterior body 3 is a pants-type disposable diaper having a continuous shape such as an hourglass shape extending over the abdominal region A, the crotch region C, and the dorsal region B. The exterior body 3 may be a split-type pants-type disposable diaper that is divided into a ventral exterior body, a back exterior body, and a crotch exterior body as separate members.

Further, the disposable diaper 1 described above is a pants-type disposable diaper having the exterior body 3 as shown in FIG. 1, but may be a developed disposable diaper.

Regarding the above-described embodiment, the following disposable diapers are further disclosed.

<1>
A ventral region disposed on the ventral side of the wearer and a dorsal region disposed on the dorsal side of the wearer, and a crotch region located therebetween, and from the ventral region to the dorsal region It has an extending longitudinal direction and a transverse direction orthogonal to the longitudinal direction, and has an absorber over the abdominal region and the dorsal region, and extends outward from each of the longitudinal front and rear ends of the absorber. A disposable diaper having a ventral waist flap and a dorsal waist flap positioned laterally,
The back waist flap has an elastic region formed by an elastic member arranged in a laterally stretched state,
The back waist flap, in the stretchable region, has a non-woven fabric having a hydrophilic region made of hydrophilic fibers,
The non-woven fabric having the hydrophilic region is folded back at the folding part located at the outer end in the longitudinal direction of the back side region, and at least one of the folding parts is closer to the wearer's skin than the elastic member. Are distributed,
The hydrophilic region is a disposable diaper that straddles the folded portion such that the side closer to the wearer's skin is longer with respect to the length in the vertical direction.

<2>
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The disposable diaper according to <1>, wherein the hydrophilic long-side portion and the hydrophilic short-side portion are not fixed at the folded-back portion.
<3>
The disposable diaper according to the item <2>, wherein the hydrophilic long portion and the hydrophilic short portion are not fixed to each other in the entire area of the hydrophilic short portion.
<4>
The hydrophilic region is arranged on the side closer to the wearer's skin than the elastic member, and has a hydrophilic long portion extending in the longitudinal direction from the folded portion, and a longitudinal direction longer than the hydrophilic long portion. Is divided into a short hydrophilic short section,
The hydrophilic short section is disposed on the side farther from the wearer's skin than the elastic member,
The disposable diaper according to any one of <1> to <3>, wherein the elastic member is sandwiched between the hydrophilic long portion and the hydrophilic short portion.
<5>
The hydrophilic region is arranged on the side closer to the wearer's skin than the elastic member, and has a hydrophilic long portion extending in the longitudinal direction from the folded portion, and a longitudinal direction longer than the hydrophilic long portion. Is divided into a short hydrophilic short section,
The hydrophilic short section is disposed on the side farther from the wearer's skin than the elastic member,
Nonwoven fabric constituting the back waist flap, in addition to the non-woven fabric having the hydrophilic region, has a hydrophobic non-woven fabric made of hydrophobic fibers,
The disposable diaper according to any one of <1> to <4>, wherein the hydrophobic nonwoven fabric is sandwiched between the hydrophilic long portion and the hydrophilic short portion.
<6>
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The said elastic member is a disposable diaper in any one of said <1>-<5> which is not being fixed to the said hydrophilic short dimension part in a lateral center area.
<7>
The hydrophilic region is arranged on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion, and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The non-woven fabric forming the back waist flap has a second hydrophobic non-woven fabric made of hydrophobic fibers in addition to the non-woven fabric having the hydrophilic region,
The disposable diaper according to any one of <1> to <6>, wherein the second hydrophobic non-woven fabric is arranged closer to a wearer's skin than the hydrophilic long portion.
<8>
The disposable diaper according to <7>, wherein the second hydrophobic nonwoven fabric and the hydrophilic elongated portion are fixed by a heat-sealing portion.
<9>
Any of the above <1> to <8>, wherein the hydrophilic region is formed by applying a hydrophilizing agent to a part of the entire region of the nonwoven fabric including the hydrophilic region that constitutes the back waist flap. The disposable diaper according to item 1.

<10>
The said hydrophilic area|region is a disposable diaper any one of said <1>-<9> formed by apply|coating a hydrophilizing agent to hydrophobic nonwoven fabric.
<11>
The back waist flap has, in the stretchable region, an inner layer sheet made of a hydrophobic nonwoven fabric made of hydrophobic fibers as a nonwoven fabric constituting the inner layer sheet, and the inner layer sheet has a hydrophilic agent over the entire length in the lateral direction. The disposable diaper according to any one of <1> to <10>, which includes the hydrophilic region formed by application.
<12>
The elastic region has a waist elastic portion and a waistline lower elastic portion,
Any of the above <1> to <11>, wherein the hydrophilic region is arranged in a stretchable region of the back waist flap, that is, a region in which a part of the waistline lower stretchable part is combined with the waist stretchable part. The disposable diaper according to item 1.
<13>
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The hydrophilic long portion and the hydrophilic short portion are respectively arranged on the side closer to the wearer's skin than the elastic member,
The disposable diaper according to any one of <1> to <12>, wherein the hydrophilic long portion is arranged closer to a wearer's skin than the hydrophilic short portion.
<14>
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The disposable diaper according to any one of <1> to <13>, wherein the hydrophilic long-sized portion and the hydrophilic short-sized portion overlap with each other so as to abut each other.
<15>
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The ratio ((L2/L1)×100) of the length (L2) in the vertical direction of the hydrophilic elongated portion to the length (L1) in the vertical direction of the one folded portion is 80% or more, preferably 90. % Or more, and the upper limit is 100%, The disposable diaper according to any one of <1> to <14>.
<16>
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The hydrophilic elongated portion does not extend to the inner end portion on the crotch region side of the one folded portion, and a hydrophobic region made of a hydrophobic constituent fiber is present at the inner end portion. , The disposable diaper according to any one of <1> to <15>.
<17>
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The disposable diaper according to any one of <1> to <15>, wherein the entire one folded portion is the hydrophilic elongated portion.
<18>
The inner end on the crotch region side of the one folded-back portion and the end in the longitudinal direction of the absorber are arranged with a space therebetween, in any one of the above items <1> to <17>. The disposable diaper described.

<19>
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The ratio ((L3/L2)×100) of the length (L3) in the vertical direction of the hydrophilic short portion to the length (L2) in the vertical direction of the hydrophilic long portion is 3% or more, preferably The disposable diaper according to any one of <1> to <18>, which is 5% or more and 80% or less, preferably 70% or less.
<20>
The length (L1) in the longitudinal direction of the one folded portion is 20 mm or more, preferably 30 mm or more, and 120 mm or less, preferably 100 mm or less, any one of <1> to <19> above. The disposable diaper described in.
<21>
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The length (L2) in the longitudinal direction of the hydrophilic long portion is 20 mm or more, preferably 30 mm or more, and 100 mm or less, preferably 90 mm or less, any of <1> to <20> above. The disposable diaper according to 1.
<22>
The hydrophilic region is arranged on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion, and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The length (L3) in the longitudinal direction of the hydrophilic short section is 1 mm or more, preferably 2 mm or more, and 80 mm or less, preferably 60 mm or less, any of <1> to <21> above. The disposable diaper according to 1.
<23>
The non-woven fabric that constitutes the back waist flap has another sheet in addition to the non-woven fabric having the hydrophilic region,
The disposable diaper according to any one of <1> to <22>, wherein a laminated sheet of a hydrophilic nonwoven fabric made of hydrophilic fibers and a hydrophobic nonwoven fabric made of hydrophobic fibers is used as the separate sheet.
<24>
The separate sheet is folded back at the longitudinal outer end portion in the back side region of the disposable diaper so as to sandwich the nonwoven fabric having the hydrophilic region, and one folded portion is arranged in a laterally extended state. The elastic member is disposed closer to the wearer's skin than the elastic member and is disposed on the skin-facing surface of the nonwoven fabric having the hydrophilic region, and the other folded portion is the wearer's skin than the elastic member. Is disposed on the non-skin facing surface of the nonwoven fabric provided with the hydrophilic region,
The separate sheet, in the one folded portion, the hydrophobic nonwoven fabric is arranged on the skin-facing surface of the nonwoven fabric provided with the hydrophilic region, and the other folded portion of the nonwoven fabric provided with the hydrophilic region. The disposable diaper according to <23>, wherein the hydrophobic non-woven fabric is laminated on the non-skin facing surface so as to be arranged.
<25>
The non-woven fabric having the hydrophilic region has an inner layer sheet, an inner layer folded portion, an outer layer sheet and an outer layer folded portion, and the hydrophilic region is formed in a part of the outer layer sheet and the outer layer folded portion. The disposable diaper according to any one of <1> to <24>.
<26>
The disposable diaper according to <25>, wherein the inner layer sheet and the outer layer sheet are formed of a hydrophobic non-woven fabric, and a hydrophilic agent is applied to a part of the outer layer sheet to form the hydrophilic region. ..
<27>
The non-woven fabric having the hydrophilic region has an inner layer sheet, an inner layer folded portion, an outer layer sheet and an outer layer folded portion,
The inner layer sheet is formed by the folded portion of the outer layer of the outer layer sheet,
The disposable diaper according to any one of <1> to <24>, wherein the hydrophilic region is formed in a part of the folded back portion of the outer layer sheet and the outer layer.

<28>
The hydrophilic region is formed on the back waist flap and the ventral waist flap,
The degree of hydrophilicity of the hydrophilic region on the abdominal waist flap side and the degree of hydrophilicity of the hydrophilic region on the back waist flap side are the same, any one of <1> to <27> above. Disposable diaper.
<29>
The disposable diaper has an exterior body,
The exterior body is arranged between the outer layer sheet on the non-skin facing surface side that forms the outer surface of the disposable diaper, the folded-back portion of the outer layer on the most skin-facing surface side, and between the outer layer sheet and the folded portion of the outer layer. Having an inner layer sheet and a folded-back portion of the inner layer,
The folded-back portion of the inner layer, which is formed by one folded-back portion of the inner-layer sheet, is formed in a laterally long rectangular shape in the back side region, according to any one of <1> to <28>. Disposable diaper.
<30>
The disposable diaper has an exterior body,
The exterior body is arranged between the outer layer sheet on the non-skin facing surface side that forms the outer surface of the disposable diaper, the folded-back portion of the outer layer on the most skin-facing surface side, and between the outer layer sheet and the folded portion of the outer layer. Having an inner layer sheet and a folded-back portion of the inner layer,
The folded-back portion of the outer layer formed by the folded-back portion of the outer layer sheet is formed in a laterally long rectangular shape in each of the abdomen side region and the back side region, of <1> to <29>. The disposable diaper according to any one of claims 1.
<31>
The disposable diaper has an exterior body,
The exterior body is arranged between the outer layer sheet on the non-skin facing surface side that forms the outer surface of the disposable diaper, the folded-back portion of the outer layer on the most skin-facing surface side, and between the outer layer sheet and the folded portion of the outer layer. Having an inner layer sheet and a folded-back portion of the inner layer,
In the back waist flap, from the side closer to the wearer's skin to the side farther, the folded-back portion of the outer layer, the folded-back portion of the inner layer, the inner layer sheet, the outer layer sheet are arranged in this order, < The disposable diaper according to any one of 1> to <30>.
<32>
The disposable diaper has an exterior body,
The exterior body is arranged between the outer layer sheet on the non-skin facing surface side that forms the outer surface of the disposable diaper, the folded-back portion of the outer layer on the most skin-facing surface side, and between the outer layer sheet and the folded portion of the outer layer. Having an inner layer sheet and a folded-back portion of the inner layer,
The exterior body has the back waist flap and the ventral waist flap,
The back waist flap and the abdominal waist flap are formed by joining and fixing the inner layer sheet and the outer layer sheet at a plurality of heat-sealed joint portions arranged in a scattered manner, The disposable diaper according to any one of <1> to <31>.
<33>
The elastic region has a waist elastic portion and a waistline lower elastic portion,
In the region extending from the waist elastic portion of each of the abdominal region and the back region to the waistline lower elastic portion, the joint portion of the inner layer sheet and the outer layer sheet is arranged in a line along the longitudinal direction. It is arranged intermittently, and the joint portion row consisting of the plurality of joint portions is arranged in a plurality of rows at intervals in the lateral direction,
A plurality of elastic members are respectively provided in a region extending from the waist elastic portion and the waist lower elastic portion of each of the abdominal region and the back region to a gap between the joint portions of each of the plurality of joint row. The disposable diaper according to <32>, which is disposed in a stretched state in the lateral direction through the diaper.
<34>
The disposable diaper includes an absorbent main body including the absorbent body, and an exterior body arranged on the non-skin facing surface side of the absorbent main body to fix the absorbent main body,
The exterior body has an outer layer sheet on the non-skin facing surface side that forms the outer surface of the disposable diaper, and an inner layer sheet,
The disposable diaper has a pair of main body side fixing regions in which the inner layer sheet and the outer layer sheet are joined together via an elastic member fixing adhesive in the vicinity of both side portions along the longitudinal direction of the absorbent main body. The disposable diaper according to any one of <1> to <33>.
<35>
The disposable diaper includes an absorbent main body including the absorbent body, and an exterior body arranged on the non-skin facing surface side of the absorbent main body to fix the absorbent main body,
The exterior body has an outer layer sheet on the non-skin facing surface side that forms the outer surface of the disposable diaper, and an inner layer sheet,
In the disposable diaper, the inner layer sheet and the outer layer sheet are provided with an elastic member fixing adhesive on both side edges of the ventral side region of the exterior body and both side edges of the back side region of the exterior body. It has a pair of outer fixing regions joined together,
The elastic member is fixed between the inner layer sheet and the outer layer sheet in each of the pair of outer fixing regions, while any of the inner layer sheet and the outer layer sheet is provided between the pair of outer fixing regions. The disposable diaper according to any one of <1> to <34>, which is not fixed.

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 1B Outer end in the longitudinal direction in the dorsal region 2 Absorbent body 21 Topsheet 22 Backsheet 23 Absorber 24 Leakproof cuff 25 Elastic member for forming leakproof cuff 3 Exterior body 4T Hydrophilic region 4TL Hydrophilic Long length portion 4TS Hydrophilic short length portion 5 Inner layer sheet 5E Inner layer folded portion 6 Outer layer sheet 6E Outer layer folded portion 71 Elastic member 72 Leg elastic member 8 Joint portion 8L Joint portion row 9 Hydrophobic non-woven fabric 91 One folded portion 92 Other folded portion 90 Separate sheet 910 One folded portion 920 Other folded portion A Ventral region, B Dorsal region, C Inseam region ST Elastic region FA Ventral waist flap FB Dorsal waist flap RP Folded part

Claims (7)

A ventral region disposed on the ventral side of the wearer and a dorsal region disposed on the dorsal side of the wearer, and a crotch region located therebetween, and from the ventral region to the dorsal region It has an extending longitudinal direction and a transverse direction orthogonal to the longitudinal direction, and has an absorber over the abdominal region and the dorsal region, and extends outward from each of the longitudinal front and rear ends of the absorber. A disposable diaper having a ventral waist flap and a dorsal waist flap positioned laterally,
The back waist flap has an elastic region formed by an elastic member arranged in a laterally stretched state,
The back waist flap, in the stretchable region, has a non-woven fabric having a hydrophilic region made of hydrophilic fibers,
The non-woven fabric having the hydrophilic region is folded back at the folding part located at the outer end in the longitudinal direction of the back side region, and at least one of the folding parts is closer to the wearer's skin than the elastic member. Are distributed,
The hydrophilic region, with respect to the length in the vertical direction, straddles the folded-back portion so that the side closer to the wearer's skin becomes longer ,
The hydrophilic region is disposed on the side closer to the wearer's skin and has a hydrophilic long portion extending in the longitudinal direction from the folded portion and a side farther from the hydrophilic long portion to the wearer's skin. And divided into a hydrophilic short portion which is shorter than the hydrophilic long portion in the longitudinal direction,
The non-woven fabric forming the back waist flap has a second hydrophobic non-woven fabric made of hydrophobic fibers in addition to the non-woven fabric having the hydrophilic region,
The second hydrophobic non-woven fabric is arranged closer to the wearer's skin than the hydrophilic long portion,
A disposable diaper in which the second hydrophobic nonwoven fabric and the hydrophilic elongated portion are fixed by a heat-sealing portion . Before Symbol The said hydrophilic part length portion and hydrophilic length radical 41, not fixed by the folded portion, the disposable diaper according to claim 1. The disposable diaper according to claim 2, wherein the hydrophilic long portion and the hydrophilic short portion are not fixed to each other in the entire area of the hydrophilic short portion. Before SL hydrophilic short radical 41 is arranged on the far side to the skin of the wearer than the elastic member,
The disposable diaper according to any one of claims 1 to 3, wherein the elastic member is sandwiched between the hydrophilic long portion and the hydrophilic short portion. Before SL hydrophilic short radical 41 is arranged on the far side to the skin of the wearer than the elastic member,
The non-woven fabric forming the back waist flap has a non-woven fabric having the hydrophilic region , and a hydrophobic non-woven fabric made of a hydrophobic fiber in addition to the second hydrophobic non-woven fabric ,
The disposable diaper according to any one of claims 1 to 4, wherein the hydrophobic nonwoven fabric is sandwiched between the hydrophilic long portion and the hydrophilic short portion. Before SL elastic member is horizontal in the direction central region, said non secured hydrophilic part length unit, the disposable diaper according to any one of claims 1 to 5. The hydrophilic region, the part of the entire area of the nonwoven fabric having a hydrophilic region is formed by applying a hydrophilic agent, any one of claim 1 to 6 constituting the back-side waist flap The disposable diaper described in.

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