JP7358802B2 - Paper containers with flanges and their blanks - Google Patents

Description

The present invention is a paper used for packaging foods such as instant noodles, udon, pasta, gratin, various rice bowls, chilled foods, frozen foods, frozen desserts, and confectionery, as well as non-food products such as air fresheners, detergents, wax, and hair products. The present invention relates to a paper container with a flange, which has an integral outward flange on the upper opening edge so that a lid can be attached thereto, and a blank thereof.

Conventionally, there has been a paper container with a rectangular flange, which is made from a single blank having a shape as disclosed in Patent Document 1, and has a top opening. By heat-sealing the periphery of the material and the flange, it is used for packaging various foods.

Furthermore, when forming the flanges of conventional rectangular paper containers with flanges, holes, which are structural defects, occur in the flanges located at the corners of the rectangle, but an invention has been proposed to close these holes. has been done. Note that the through hole penetrates the blank from the upper surface to the lower surface, and there is a possibility that the contents may leak through the through hole.

Furthermore, since the flange is made of one sheet of paper, there is a risk that the flange may lack strength if the weight of the contents is large. Furthermore, since there is no protection for the end face of the edge of the flange, if it is attacked by moisture or a liquid with high penetrating power, the stiffness of the paper material may decrease and the strength of the flange may decrease.

The invention of Patent Document 1 will be explained using FIGS. 14 to 16. Note that since the drawing is symmetrical, the reference numerals are written only on the right half.
First, the blank from which the flanged paper container 90 is obtained will be explained. FIG. 14 shows a blank 60 for the flanged paper container 90, and FIG. 15 is an enlarged view of a corner portion of the blank 60 in FIG. 14. A first side plate 62 is connected to two opposing first sides 71 of a rectangular bottom plate 61 via a mountain fold line, and the bottom plate 61 of the first side plate 62 is different from the first side plate 62. A first edge piece 63, which is a component of the flange, is connected to the outer edge 72 of the first side plate on the opposite side via a valley fold line. A first peninsular piece 631 extending in the lateral direction (longitudinal direction of the first edge piece 63) is provided at the left and right ends of the first edge piece 63 (ends facing each other in the longitudinal direction of the first edge piece 63). It is being

The left and right first side plate side edges 73 of the first side plate 62 (the sides opposite in the width direction of the first side plate 62 in the container form) are connected to an inverted triangular first folding joint via a mountain fold line, respectively. A joining edge piece 622 is connected to an outer edge 75 of the first folding joining plate opposite to the bottom plate 61 of the first folding joining plate 621 via a valley fold line. .

The joining edge piece 622 forms the same plane as the first peninsular piece 631 through the notch. The cut end of the cut that separates the first peninsular piece 631 from the joint edge piece 622 and the first folded joint plate 621 is the mountain fold of the first side plate side 73 of the first side plate 62. line, the valley fold line of the first side plate outer side 72 of the first side plate 62, and the valley fold line of the first folded joint plate outer side 75 of the first folded joint plate 621 have reached the gathering point L. . Due to this cut, the first peninsular piece 631 is separated from the joining edge piece 622 and the first folded joining plate 621 during box manufacturing.

Further, a second side plate 64 is connected to the other two opposing second side sides 81 of the bottom plate 61 via mountain fold lines, and the bottom plate 61 of the second side plate 64 A second edge piece 65, which is a constituent member of the flange, is connected to the outer edge 82 of the second side plate on the opposite side through a valley fold line. A second peninsular piece 651 extending in the lateral direction (longitudinal direction of the second edge piece 65) is provided at the left and right ends of the second edge piece 65 (ends facing each other in the longitudinal direction of the second edge piece 65). It is provided.

Then, during box manufacturing, the upper part of the mountain fold line of the first side plate side 73 of the first side plate 62 and the upper part of the valley fold line of the second side plate side 83 of the second side plate 64 are properly aligned. In the overlapped state (the state where the assembly point M overlaps the assembly point L), the second peninsula-shaped piece of the second edge piece 65 is placed on the upper surface of the first peninsula-shaped piece 631 of the valley-folded first edge piece 63. If the lower surfaces of the pieces 651 are overlapped and heat-sealed, even if a minute hole is formed at the gathering point L where the cut end of the first peninsular piece 631 extends, this part will be removed from the second side plate. The shape is such that it is covered by the part of the gathering point M which is the upper part of the valley fold line of the second side plate side 83 of 64.

Furthermore, a projection piece 66 is integrally provided at the end of each of the second peninsular pieces 651 on the second side plate 64 side. The protruding piece 66 is provided so as to be located only in an area above the upper surface of the first edge piece 63 where the first peninsular piece 631 is continuous after the box is made, and It is provided so as not to overlap the bent portion of the valley fold line between the side plate 62 and the first edge piece 63.

Since the packaging material constituting the blank 60 is a thermoplastic resin layer with heat sealability on both sides, heat sealing is performed with the upper surface of the first edge piece 63 and the lower surface of the protrusion piece 66 facing each other. , the protruding piece 66 is heat-sealed within the heat-sealing area of the first edge piece 63. In this case, since the protruding piece 66 does not straddle the valley fold line between the first side plate 62 and the first edge piece 63, the protruding piece 66 is in a flat plate state without being bent. It is adhered to the first edge piece 63 as it is.

Assembly to obtain the flanged paper container 90 from the blank 60 is performed as follows. That is, the first side plate 62 and the second side plate 64 are bent and assembled into a tray shape, and the inner surfaces of the first folded joint plate 621 and the second folded joint plate 641 are adhered to each other. Next, the bonded first folding joint plate 621 and second folding joint plate 641 are bent toward the second side plate 64 side. At the same time, the first edge piece 63, the second edge piece 65, and the joining edge piece 622 are each valley-folded to form the bonded first folded joining plate 621 and second folded joining plate 641 to the second side plate. 64, the upper surface of the joining edge piece 622 and the lower surface of the second edge piece 65 overlapping thereon face each other, and the opposing joining edge piece 622 and second edge piece 65 While heat-sealing, the upper surface of the first peninsular piece 631 and the lower surface of the second peninsular piece 651 are opposed to each other by bending the first side plate 62 and the second side plate 64. The shaped piece 631 and the second peninsula shaped piece 651 are heat-sealed to form a flange 92 in which the first edge piece 63 and the second edge piece 65 are continuous, and the flanged paper container 90 is assembled. (Figure 16).

At each corner of the flange 92 of the flanged paper container 90, a second peninsular piece 651 is superimposed on the first peninsular piece 631 and bonded by heat sealing. The gathering point L, which is the upper part of the mountain fold line of the first side plate side 73 of the side plate 62, has a gathering point M, which is the upper part of the valley fold line of the second side plate side 83 of the second side plate 64. The result is a paper container that is tightly overlapped. Further, the protrusion piece 66 is heat-sealed to the upper surface of the first edge piece 63 during heat sealing to form the flange 92 of the flanged paper container 90, and as described above, the protrusion piece 66 This flanged paper container 90 is assembled so as to be located only within the area of the heat sealing surface of the first edge piece 63 without touching the face plate 62 side.

Japanese Patent Application Publication No. 2012-188159 JP2009-292537A

However, in the invention of Patent Document 1, if the contents of the container are powdery, viscous, or other materials that are difficult to flow, the container will not leak, but if the contents are liquid, there is a risk of leakage.

That is, when the flanged paper container 90 is assembled by the paper container assembly device, the first side plate 62 and the second side plate 64, which are connected to the bottom plate 61, are folded up from the mountain fold line. , due to factors such as assembly accuracy of the container and variations in blank quality, the upper part of the mountain fold line at the first side plate side 73 of the first side plate 62 and the second side plate side of the second side plate 64 The assembly of the paper container may proceed in a state where the upper part of the valley fold line at the side 83 does not overlap at a predetermined position and is slightly separated. Then, the blank 60 is heat-sealed in the above state. As a result, the protruding piece 66 located on the second peninsular piece 651 may float away from the gathering point L.

In addition, since the size and shape of the protruding piece 66 are not specified, the effect of preventing a gap from forming between the lid material and the protruding piece 66 is not guaranteed, and fine particles at the gathering point L of the flange 92 The problem of leakage of contents from through holes cannot be solved.
Furthermore, when looking down on the flanged paper container 90 from above, even if the through hole at the gathering point L of the flange 92 is blocked by the protruding piece 66, the area to be blocked is not large enough. Or, in the case of permeable contents, the contents may ooze out through the end surface of the blank 60 of the projection piece 66.

Further, in the flanged paper container of Patent Document 2, the flanges are folded back and overlapped, but the structure of the corner portion of the container is complicated and cannot be easily assembled.

The present invention has been made in view of the above situation, and aims to provide a flanged paper container in which the flanges are strengthened by folding and overlapping the flanges, and the outer edges of the flanges are protected.
Another object of the present invention is to provide a flanged paper container whose blank has a simple configuration and is easy to assemble.

Furthermore, it is possible to reliably close the through holes that occur at the gathering points L and M of the flanges in conventional paper containers with flanges, and when the contents are filled and the lid is sealed, the contents are It is an object of the present invention to provide a flanged paper container that does not leak from through holes formed at a point L and an assembly point M.

The present invention has solved the above problems through the following aspects.
That is, in the first aspect of the present invention, in the blank 10 of the flanged paper container 50,
The blank 10 includes an n-sided bottom plate having an even number of corners of 4 or more,
One of the n sides of the bottom plate 11 is defined as a first bottom plate side 31, and a side of the bottom plate 11 adjacent in one direction to the first bottom plate side 31 is defined as a second bottom plate side. The side of the face plate is 41, and then sequentially from the third side of the bottom plate 31 to the nth side of the bottom plate 41,
Odd-numbered side plates 12 are connected to each of the odd-numbered bottom plate side edges 31 via the mountain fold line, and even-numbered side plates 12 are connected to each of the even-numbered bottom plate side edges 41 via the mountain fold line. A side plate 14 is provided in series,
An inverted triangular odd-numbered fold is made to the corner of the bottom plate 11 via a mountain fold line on each of the side sides 33 of the odd-numbered side plate 12 located on both sides of the blank 10 in the circumferential direction. One side of the joint plate 121 is provided,
An even-numbered fold is made in an inverted triangular shape with respect to a corner of the bottom plate 11 via a valley fold line on each of the side edges 43 of the even-numbered side plate 14 located on both sides of the blank 10 in the circumferential direction. One side of the joint plate 141 is provided,
The other side 34 of the odd-numbered folded joint plate 121 is arranged in the circumferential direction of the blank 10, and the other side 44 of the even-numbered folded joint plate 141 is arranged in the circumferential direction of the blank 10. form the common side that becomes the mountain fold line,
Each of the odd-numbered folded joint plates 121 has a joint edge piece 122 connected to the outer edge 35 of the odd-numbered folded joint plate 121 on the side that becomes the edge of the flanged paper container 50 via a valley fold line. established,
Each of the odd-numbered side plates 12 has an odd-numbered edge attached to the outer edge 32 of the odd-numbered side plate 12 on the side that becomes the edge of the flanged paper container 50 via a valley fold line. One upper part 13 is arranged in succession,
Ends 131 of the odd-numbered upper edge piece 13 are provided extending from both ends of the odd-numbered upper edge piece 13 in a direction along the edge of the flanged paper container 50,
On the outer edge 42 of the even-numbered side plate 14 on the side that will become the edge of the flanged paper container 50 of the even-numbered side plate 14, an even-numbered edge piece upper part 15 is attached via a valley fold line. are installed in succession,
An end portion 151 of the even-numbered upper edge piece 15 is provided extending from both ends of the even-numbered upper edge piece 15 in a direction along the edge of the flanged paper container 50,
On each of the odd-numbered upper edge pieces 13, an odd-numbered edge is attached via a valley fold line to the outer edge 36 of the odd-numbered upper edge piece 13 on the side that becomes the edge of the flanged paper container 50. The edge piece folded portions 16 are arranged in a row,
Projections 18 protruding outward from the blank 10 from at or near both ends of the odd-numbered edge folded portions 16,
an inner side 39 of the protrusion 18 extending toward the inner side of the blank 10 from the end point of the side edges 37 at both ends of the odd-numbered edge folded portion 16 in the outer direction of the blank 10; and the odd-numbered edge The angle θE of the corner E formed by the outer edge 38, which is the outer edge of the single folded portion 16, and the angle θE of the corner E of the bottom plate 11 that is closest to the corner E. The angle θF is approximately the same angle,
On each of the even-numbered upper edge pieces 15, an even-numbered edge piece is attached via a valley fold line to the outer edge 46 of the even-numbered upper edge piece 15 on the side that becomes the edge of the flanged paper container 50. It is characterized in that the edge piece folded portions 17 are provided in a row.

According to the aspect of this embodiment, in the flanged paper container 50, the flange 52 can be strengthened.

Furthermore, according to the present embodiment, the protrusion portions 18 projecting outward from the blank 10 are extended from both ends or near both ends of the odd-numbered edge folded portions 16. From the end point H of the side edges 37 at both ends in the outer direction of the blank 10, the inner edge 39 of the protrusion 18 toward the inner side of the blank 10, and the outer edge of the odd-numbered edge folded portion 16. The angle θE of the corner E formed by the side 38 and the angle θF of the corner F of the bottom plate 11 located closest to the corner E among the corners of the bottom plate 11 are approximately the same angle. It is characterized by certain things.

To further explain the first aspect, protrusions 18 protruding outward from the blank 10 extend from both ends or near both ends of the odd-numbered edge folded portions 16, and the odd-numbered edge folded portions an inner side 39 of the protrusion 18 extending inward from the blank 10 from the end point of the side 37 at both ends of the blank 10 in the outer direction of the blank 10, and an outer edge of the odd-numbered edge folded portion 16. The angle θE of the corner E formed by the outer side 38 and the angle θF of the corner F of the bottom plate that is located closest to the corner E among the corners of the bottom plate are substantially the same angle. It is characterized by

According to the aspect of the present embodiment, by making the angle θE and the angle θF substantially the same , the outer side 38 of the odd-numbered edge folding portion 16 and the odd-numbered edge folding Since the inner side 39 of the protrusion 18 of the section 16 can approach the body 51 of the flanged paper container 50, the area where the stack of blanks 10 is made of two sheets increases, The flange can be further strengthened, and the appearance is also preferable.

A second aspect of the present embodiment is that when assembling the flanged paper container 50,
The odd-numbered edge folded portion 16 and/or the protrusion 18 of the odd-numbered edge folded-back portion 16 are located near the joint between the odd-numbered edge upper portion 13 and the even-numbered edge upper portion 15. ,
The inner end point of the blank 10 of the notch 132 of the end 131 of the odd-numbered edge piece upper part 13, the mountain fold line of the side 33 of the odd-numbered side plate 12, and the odd-numbered side plate 12 An assembly point A with the valley fold line of the outer edge 32,
Transparency that may occur when the outer edge 152 of the end 151 of the even-numbered upper edge piece 15 and the gathering point B, which is the intersection of the outer edge 142 of the even-numbered folded joint plate 141, overlap or come close to each other. It is characterized by blocking the holes.

According to the aspect of the present embodiment, there is a possibility that the odd-numbered edge folded portions 16 and/or the projections 18 of the odd-numbered edge folded portions 16 occur at the meeting points A and B of the corner portions of the flange 52. Since the through hole with the leakage can be closed from the lower surface side, it is possible to provide the flange 52 from which the contents do not easily leak.

A third aspect of the present embodiment is that, in the width of the blank 10 from the inside to the outside, the width of the odd-numbered edge folded portion 16 is 105% or more of the width of the odd-numbered edge piece upper part 13. It is characterized by being 120% or less.

According to the aspect of the present embodiment, the odd-numbered edge folded portions 16 can reliably close the through holes that may occur at the gathering points A and B of the corner portions of the flange 52 from the lower surface side. , it is possible to provide a flange 52 whose contents are unlikely to leak.

A fourth aspect of the present embodiment is a flanged paper container 50 formed by assembling the blanks 10 of the flanged paper container 50 in the first aspect.

To further explain aspects of the present embodiment, the side plates 12 and 14 are assembled from the flanged paper container blank 10 into a hollow container shape, and the odd-numbered folded joint plate 121 and the even-numbered The folded joint plates 141 of the odd-numbered folded joint plates 121 are overlapped, and the vicinity of the folded joint plate outer edge 35 of the odd-numbered folded joint plate 121 and the vicinity of the outer edge 142 of the even-numbered folded joint plate 141 are connected to the odd-numbered side plate 12. from the side 33 to the side 43 of the even-numbered side plate 14, and these two superimposed bonded plates 121, 141 are further attached to the outer surface of the even-numbered side plate 14. The odd-numbered edge piece upper part 13, the even-numbered edge piece upper part 15, and the joining edge piece 122 are folded and overlapped, and the two joining plates 121 and 141 are folded into the even-numbered side plate. 14, the upper surface of the end 131 of the odd-numbered edge piece upper part 13 and the lower surface of the end 151 of the even-numbered edge piece upper part 15 are adhered, and the odd-numbered edge piece folded part 16 is valley-folded at the outer edge 36 of the odd-numbered edge piece upper part 13, and the lower surface of the odd-numbered folded part 16, the lower surface of the odd-numbered edge piece upper part 13, and the joining edge piece 122 are folded. The lower surface, the lower surface of the edge part 131 of the odd-numbered upper edge piece, and the lower surface of the even-numbered edge piece upper part 15 face and are joined, and the even-numbered edge folded part 17 is connected to the even-numbered edge piece upper part 15. The flange 52 is formed by valley-folding the outer edge 46 of the upper edge piece 15 so that the lower surfaces of the even-numbered edge folded portions 17 and the lower surfaces of the even-numbered upper edge pieces 15 are faced and joined. This is a paper container 50 with a flange.

According to the aspect of the present embodiment, it is possible to provide a flanged paper container 50 that has a reinforced flange 52 and has a flange 52 with little leakage and excellent sealing performance.

A fifth aspect of the present embodiment is that protrusions 18 protruding toward the outside of the blank extend from both ends or near both ends of the odd-numbered edge folded portions 16,
an inner side 39 of the protrusion 18 extending toward the inner side of the blank from an end point H on the outer side of the blank of the side edges 37 at both ends of the odd-numbered edge folded portion 16; The angle θE of the corner E formed by the outer edge 38, which is the outer edge of the folded part,
In the vicinity of the flange 52 of the flanged paper container 50, the angle θG formed by the odd-numbered side plates 12 and the odd-numbered folded joint plates 121 is characterized by being approximately the same angle.

Note that the angle θG is an angle when the body portion 51 of the flanged paper container 50 is cut along a horizontal plane.
Further, the side sides 37 at both ends of the odd-numbered edge folded portions 16 may have bent portions, and a portion of the side sides 37 is substantially parallel to the outer side 36 of the odd-numbered edge piece upper part 13. It may become. (See Figure 2).

According to the aspect of the present embodiment, the odd-numbered edge folded portions 16 can close the through holes that may occur at the gathering points A and B of the corner portions of the flange 52 from the lower surface side. A flanged paper container 50 having a flange 52 that prevents contents from leaking can be provided.

Moreover, since the odd-numbered edge folded portions 16 can be enlarged to the position of the body 51 of the flanged paper container 50, the odd-numbered edge folded portions 16 can be folded back to form the odd-numbered edge folded portions 16. When located in contact with or near the edge piece upper part 13, the overlapping area of the odd-numbered edge piece folded part 16 and the odd-numbered edge piece upper part 13 can be increased. Therefore, the flange 52 can be strengthened.

A sixth aspect of the present embodiment is that in the fifth aspect, the odd-numbered folded portion 16 has side edges 37 at both ends in a direction along the edge of the flanged paper container 50; It is characterized in that the distance between the opposing even-numbered edge folded portions 17 and the side edges 47 at both ends in the direction along the edge of the flanged paper container 50 is 0.2 mm or more and 3 mm or less.

According to the aspect of this embodiment, when the flanged paper container 50 is molded to form the flange 52, the gap between the odd-numbered edge folded portions 16 and the even-numbered edge folded portions 17 is 3 mm. By making it smaller, the area in which the laminate of blanks 10 is made of two sheets increases in the flange 52, thereby strengthening the flange 52. Moreover, since the gap is small, the appearance is also improved.
Furthermore, since the gap is 0.2 mm or more, the odd-numbered folded edge portions 16 and the even-numbered folded edge portions 17 do not overlap, and the flatness of the flange 52 can be maintained.

According to the present invention, in a flanged paper container, the flange can be strengthened by folding back the flange, and since the blank shape is simple, the flanged paper container can be easily assembled.
In addition, the through-holes that may occur at the gathering points of the corners of the flanges in flanged paper containers can be closed by the folded edges, and when the contents are filled and the lid is sealed, the Objects are less likely to leak from the gathering point at the corner of the flange.

FIG. 2 is a diagram of a blank of a flanged paper container having a rectangular bottom plate according to the present embodiment. FIG. 2 is an enlarged view of a corner portion of the blank of the rectangular flanged paper container shown in FIG. 1; FIG. 2 is a diagram of a flanged paper container blank having a hexagonal bottom plate according to the present embodiment. FIG. 4 is an enlarged view of a corner portion of the blank of the hexagonal flanged paper container shown in FIG. 3; FIG. 2 is a diagram of a blank of a flanged paper container having an octagonal bottom plate according to the present embodiment. FIG. 6 is an enlarged view of a corner portion of the blank of the octagonal flanged paper container shown in FIG. 5; FIG. 1 is a perspective view of a rectangular flanged paper container according to the present embodiment. FIG. 1 is a perspective view of a hexagonal flanged paper container according to the present embodiment. FIG. 1 is a perspective view of an octagonal flanged paper container according to the present embodiment. FIG. 8 is an enlarged view from below of the corner portion of the rectangular flanged paper container of FIG. 7 in a state immediately before the folded edge portion is bent. FIG. 8 is an enlarged view of the completed corner portion of the rectangular flanged paper container of FIG. 7 when viewed from below. FIG. 10 is an enlarged view of the corner portion of the octagonal flanged paper container of FIG. 9 in a state immediately before the folded edge portion is bent from below; FIG. 10 is an enlarged view of the completed corner portion of the octagonal flanged paper container of FIG. 9 viewed from below. 1 is a diagram of a blank of a flanged paper container according to the prior art; FIG. FIG. 15 is an enlarged view of a corner portion of the blank of the flanged paper container shown in FIG. 14; FIG. 1 is a perspective view of a paper container with flanges according to the prior art.

Hereinafter, embodiments according to the present invention will be described in more detail using the drawings. However, the present invention is not limited to these specifically illustrated forms or various specifically described configurations.
Note that in each drawing, the sizes and proportions of members may be changed or exaggerated in order to make it easier to understand. Further, for ease of viewing, parts unnecessary for explanation or repetitive symbols may be omitted.

FIG. 1 is a diagram of a blank 10 of a rectangular flanged paper container 50 of a first aspect according to the present embodiment. Since the bottom plate 11 has a rectangular shape, when the assembled flanged paper container 50 is observed from above the opening surface, a rectangular container is observed. (Figure 7).

FIG. 1 is a drawing showing a blank 10 before a flanged paper container 50 is assembled. Although the blank 10 shown in FIG. 1 has a rectangular bottom plate 11, it can be developed into a polygonal shape having an even number of corners, such as a hexagonal shape or an octagonal shape.

In the rectangular flanged paper container 50, one of the four sides of the rectangular bottom plate 11 is defined as the first bottom plate side 31, and the counterclockwise direction of the first bottom plate side 31 is set as the first bottom plate side 31. The sides of the bottom plate 11 that are adjacent to each other in the direction are defined as a second bottom plate side 41, a third (odd numbered) bottom plate side 31, and a fourth (even numbered) bottom plate side 41. The fourth bottom plate side 41 is adjacent to the first bottom plate side 31, and the rectangle of the bottom plate 11 is closed.

In this embodiment, the bottom plate has a polygonal shape with an even number of corners of 4 or more, so the odd-numbered bottom plate side edges 31 and the even-numbered bottom plate side edges 41 exist alternately and are the same. Different types of bottom plate sides, specifically, odd-numbered bottom plate sides 31 and even-numbered bottom plate sides 41 are not adjacent to each other.

Odd-numbered side plates 12 are connected via each of the odd-numbered bottom plate side edges 31 consisting of the first and third, and each of the even-numbered bottom plate sides 41 consisting of the second and fourth Even-numbered side plates 14 are connected to each other via. That is, around the bottom plate 11, two of the odd-numbered side plates 12 and two of the even-numbered side plates 14 are arranged in succession alternately.

Odd-numbered side plates 12 are connected to each of the odd-numbered bottom plate side edges 31 via mountain fold lines. An inverted triangular shape with the corner of the bottom plate 11 as the apex is formed on each of the odd-numbered sides 33 of the odd-numbered side plates 12 located on both sides of the blank 10 in the circumferential direction. One side of the folding joint plate 121 is provided.

Similarly, even-numbered side plates 14 are connected to each of the even-numbered bottom plate side edges 41 via mountain fold lines. The even-numbered side plates 14 of the even-numbered side plates 14 are formed in an inverted triangular shape with the corner of the bottom plate 11 as the apex through valley fold lines on each of the even-numbered side edges 43 located on both sides of the blank 10 in the circumferential direction. One side of the folding joint plate 141 is provided.

The side edges 34 of the odd-numbered folding joint plates 121, which are arranged in the circumferential direction of the blank 10 of the odd-numbered folding joint plates 121 and are opposite to the odd-numbered side plates 12, and the even-numbered folding joints The even-numbered side plates 14 arranged in the circumferential direction of the blank 10 of the plate 141 and the opposite side sides 44 of the even-numbered folded joint plates 141 form a common side that forms a mountain fold line. There is.

Each of the odd-numbered folded joint plates 121 has a joint edge piece attached to the outer edge 35 of the odd-numbered folded joint plate 121 on the side that will become the edge of the flanged paper container 50 via a valley fold line. 122 are arranged in series.

On each of the odd-numbered side plates 12, an odd-numbered edge piece upper part 13 is attached to the outer edge 32 of the odd-numbered side plate on the side that becomes the edge of the flanged paper container 50 via a valley fold line. are installed in succession.
Ends 131 of the odd-numbered upper edge pieces 13 are provided extending from both ends of the odd-numbered upper edge pieces 13 in a direction along the edge of the flanged paper container 50.

Further, the end portion 131 of the odd-numbered edge piece upper part 13 is connected to the joining edge piece 122 and the odd-numbered folding joining plate 121 via a cut 132.

The joining edge piece 122 forms the same plane as the end portion 131 of the odd-numbered edge piece upper part 13 and the odd-numbered folded joining plate 121 with the cut 132 interposed therebetween.
Then, the notch 132 faces inward from the outer edge 124 of the joining edge piece 122 into the blank 10, further touches the outer edge 35 of the odd-numbered folded joining plate 121, and then contacts the outer edge 35 of the odd-numbered folded joining plate 121. The edge piece bends in the direction of the upper part 13.

Furthermore, the cut 132 is formed on the extension line of the outer side 35 of the odd-numbered folded joint plate 121, and between the mountain fold line of the side edge 33 of the odd-numbered side plate 12 and the outer edge of the odd-numbered side plate 12. It reaches the gathering point A with the valley fold line of 32. Alternatively, the neighborhood before reaching the destination may be used as the end.

The notches 132 separate the odd-numbered ends 131 from the joining edge pieces 122 and the odd-numbered folded joining plates 121 when the flanged paper container 50 is assembled.

Further, an even-numbered edge piece upper part 15 is attached to the outer edge 42 of the even-numbered side plate 14 on the side that is the edge of the flanged paper container 50 of the even-numbered side plate 14 through the valley fold line. are installed in succession.
Ends 151 of even-numbered upper edge pieces are provided extending from both ends of the even-numbered upper edge pieces 15 in a direction along the edge of the flanged paper container 50.

Further, each of the odd-numbered upper edge pieces 13 is provided with a valley fold line on the outer edge 36 of the odd-numbered upper edge piece 13 on the side that becomes the edge of the flanged paper container 50. The edge piece folded portions 16 are continuously provided.

Further, each of the even-numbered upper edge pieces 15 is provided with a valley fold line on the outer edge 46 of the even-numbered upper edge piece 15 on the side that becomes the edge of the flanged paper container 50. The edge piece folded portions 17 are continuously provided.

The side edges 44 of the even-numbered folded joint plates 141, which are common to the side sides 34 of the odd-numbered folded joint plates 121, are mountain-folded to form the edges of each of the blanks 10 of the flanged paper container 50. The side plates 12 and 14 are bent and assembled into a hollow container shape, and the odd-numbered folded joint plates 121 and the even-numbered folded joint plates 141 are overlapped and joined. Then, these two folded joining plates 121 and 141 which have been superimposed are further folded toward the outer surface of the even-numbered side plates 14 and overlapped. Further, the odd-numbered upper edge pieces 13, the even-numbered upper edge pieces 15, and the joining edge pieces 122 are each valley-folded.

By this means, the upper surface of the end portion 131 of the odd-numbered upper edge piece 13 and the lower surface of the end portion 151 of the even-numbered upper edge piece 15 are joined.
Thereafter, the odd-numbered edge folded portion 16 is folded into a valley fold at the outer edge 36 of the odd-numbered edge piece upper portion 13, so that the lower surface of the odd-numbered edge folded portion 16 and the odd-numbered edge The lower surface of the upper piece 13, the lower surface of the joining edge piece 122, the lower surface of the edge part 131 of the odd-numbered edge piece upper part, and the lower surface of the even-numbered edge piece upper part 15 are joined together.

Furthermore, the outer edge 46 of the even-numbered edge piece upper part 15 is valley-folded, the even-numbered edge folded part 17 is folded back, and the lower surface of the even-numbered edge piece folded part 17 is folded into the joining edge piece. 122, the lower surfaces of the ends 131 of the odd-numbered upper edge pieces 13, and the lower surfaces of the even-numbered upper edge pieces 15 are made to face each other and are joined.

Note that the joining edge piece 122 and the end portion 131 of the odd-numbered edge piece upper part 13 are partially present between the even-numbered edge piece folded part 17 and the edge piece upper part 15. Therefore, the close contact between the even-numbered edge folded portions 17, the joining edge pieces 122, and the ends 131 of the odd-numbered edge piece upper portions 13 is strong, and the joints thereof are firm. However, since there is a gap equivalent to one blank laminate between the even-numbered edge folded portion 17 and the edge piece upper part 15, even if the gap is reduced by bending the blank, the even-numbered The connection between the folded edge portion 17 and the upper edge portion 15 is weak, and depending on the situation, they may not be bonded.

Through the above-described procedure, the flange 52 that is continuous in a circumferential manner and reinforced by the folded edge portion is formed, and the rectangular flanged paper container 50 of this embodiment is assembled. (Figure 7).

An assembly procedure for obtaining the flanged paper container 50 from the blank 10 will be explained. Note that the upper surface of the blank 10 indicates the side that contacts the contents, and the lower surface indicates the opposite side. Further, the upper surface of the flanged paper container 50 refers to the surface on which the contents are placed (top surface), and the lower surface refers to the surface on the opposite side.

The odd-numbered side plates 12 and the even-numbered side plates 14 are assembled into a hollow container shape, and the vicinity of the outer edge 35 of the odd-numbered folded joint plate 121 and the outer edge 142 of the even-numbered folded joint plate 141 are assembled into a hollow container shape. The vicinity is continuously heat-sealed from the side edges 33 of the odd-numbered side panels 12 to the side edges 43 of the even-numbered side panels 14.

Next, the heat-sealed odd-numbered folded joint plates 121 and even-numbered folded joint plates 141 are bent toward the even-numbered side plates 14. At the same time, the odd-numbered upper edge pieces 13, the even-numbered upper edge pieces 15, and the joining edge pieces 122 are valley-folded and heat-sealed to the odd-numbered folded joining plates 121 and the even-numbered folded joining plates 141. are bent and overlapped on the outer surface side of the even-numbered side plates 14. As a result, the upper surface of the joining edge piece 122 and the lower surface of the even numbered edge piece upper part 15 overlapping thereon face each other, and the opposing joining edge piece 122 and the even numbered edge piece upper part 15 are heat-sealed. do.

By bending the odd-numbered side plates 12 and the even-numbered side plates 14, the upper surface of the end 131 of the odd-numbered upper edge piece 13 and the lower surface of the edge 151 of the even-numbered upper edge piece 15 are formed. are opposed and heat sealed. The odd-numbered edge piece upper parts 13 and the even-numbered edge piece upper parts 15 are continuous.

The outer edge 36 of the odd-numbered edge piece upper part 13 is valley-folded, the odd-numbered edge folded part 16 is folded back, and the lower surface of the odd-numbered edge piece folded part 16 is folded back to the odd-numbered edge piece. The lower surface of the upper part 13, the lower surface of the joining edge piece 122, the lower surface of the edge part 131 of the odd-numbered edge piece upper part, and the lower surface of the even-numbered edge piece upper part 15 are heat-sealed.

Further, the outer edge 46 of the even-numbered edge piece upper part 15 is valley-folded, the even-numbered edge folded part 17 is folded back, and the lower surface of the even-numbered edge piece folded part 17 is formed by the joining edge piece. 122, the lower surface of the end 131 of the odd-numbered upper edge piece, and the lower surface of the even-numbered upper edge piece 15.

Through the above-described procedure, the flange 52 that is continuous in a circumferential manner and reinforced by the folded edge portion is formed, and the rectangular flanged paper container 50 is assembled. (Figure 7).

FIG. 3 shows a blank 10 of a flanged paper container 50 in which the bottom plate 11 has a hexagonal shape, and FIG. 4 is an enlarged view of a corner portion of FIG. 3.
Note that the bottom plate 11 does not have to have a regular hexagonal shape, but it is preferable that the inner angles thereof are of equal size. In the case of a hexagonal shape, it is 120°.
FIG. 8 shows a flanged paper container 50 in which the bottom plate 11 has a hexagonal shape.

In the hexagonal flanged paper container 50, one of the six sides of the hexagonal bottom plate 11 is the first bottom plate side 31, and the counterclockwise direction of the first bottom plate side 31 is set as the first bottom plate side 31. The side of the bottom plate 11 adjacent to the direction is defined as the second bottom plate side 41, and the third (odd numbered) bottom plate side 31, the fourth (even numbered) bottom plate side 41, and the fifth (odd numbered) bottom plate side 31, and sixth (even numbered) bottom plate side 41. The sixth bottom plate side edge 41 is adjacent to the first bottom plate side edge 31, and the hexagonal shape of the bottom plate 11 is closed.

Odd-numbered side plates 12 are connected via each of the odd-numbered bottom plate side edges 31 consisting of the first, third, and fifth, and the even-numbered bottom plates include the second, fourth, and sixth. Even-numbered side plates 14 are connected to each other via each of the face plate side edges 41. That is, around the bottom plate 11, three of the odd-numbered side plates 12 and three of the even-numbered side plates 14 are arranged in succession alternately.

The sides and various plates of the odd-numbered side plates 12 provided at both circumferential ends of the blank 10 and the sides and plates provided toward the outer edge of the blank 10 are similar to those in which the bottom plate 11 described previously is rectangular. It has the same components as blank 10. Moreover, each side provided in the odd-numbered side plate 12 and each side and each plate connected to each plate are also the same constituent elements as the blank 10 in which the bottom plate 11 is rectangular.

The sides and various plates of the even-numbered side plates 14 provided at both circumferential ends of the blank 10 and the sides and plates provided toward the outer edge of the blank 10 are similar to those in which the bottom plate 11 described previously is rectangular. It has the same components as blank 10. Further, each side of the even-numbered side plates 14 and each side and each plate connected to each plate are also the same constituent elements as the blank 10 in which the bottom plate 11 is rectangular.

Therefore, since the constituent elements of the blank 10 having the hexagonal bottom plate 11 are the same as the constituent elements of the rectangular blank 10 described above, a description of the structure of the hexagonal blank 10 will be omitted.

FIG. 5 shows a blank 10 of a flanged paper container 50 in which the bottom plate 11 has an octagonal shape, and FIG. 6 is an enlarged view of a corner portion of FIG.
Note that the bottom plate 11 does not have to have a regular octagonal shape, but it is preferable that the inner angles thereof are equal angles. In the case of an octagonal shape, it is 135°.
FIG. 9 shows a flanged paper container 50 in which the bottom plate 11 is octagonal.

In the octagonal flanged paper container 50, one of the eight sides of the octagonal bottom plate 11 is defined as the first bottom plate side 31, and the counterclockwise direction of the first bottom plate side 31 is set as the first bottom plate side 31. The side of the bottom plate 11 adjacent to the direction is defined as the second bottom plate side 41, and the third (odd numbered) bottom plate side 31, the fourth (even numbered) bottom plate side 41, and the fifth (odd numbered) bottom plate side 31, 6th (even numbered) bottom plate side 41, 7th (odd numbered) bottom plate side 31, 8th (even numbered) bottom plate side 41. There is. The eighth bottom plate side 41 is adjacent to the first bottom plate side 31, and the octagonal shape of the bottom plate 11 is closed.

Odd-numbered side plates 12 are connected through each of the odd-numbered bottom plate side edges 31 consisting of the first, third, fifth, and seventh, and the second, fourth, sixth, and eighth Even-numbered side plates 14 are connected to each other through each of the even-numbered bottom plate side edges 41 . That is, around the bottom plate 11, four of the odd-numbered side plates 12 and four of the even-numbered side plates 14 are arranged in succession alternately.

The sides and various plates of the odd-numbered side plates 12 provided at both circumferential ends of the blank 10 and the sides and plates provided toward the outer edge of the blank 10 are the blanks in which the bottom plate 11 described previously is rectangular. It has the same configuration as 10. Furthermore, the configuration of each side of the odd-numbered side plate 12 and each side and each plate connected to each plate is the same as that of the blank 10 in which the bottom plate 11 is rectangular.

The sides and various plates provided at both circumferential ends of the blank 10 of the even-numbered side plates 14 and the sides and plates provided toward the outer edge of the blank 10 are the blanks in which the bottom plate 11 described previously is rectangular. It has the same configuration as 10. Furthermore, the configurations of each side of the even-numbered side plates 14 and each side and each plate connected to each plate are also the same as those of the blank 10 in which the bottom plate 11 is rectangular.

Therefore, the constituent elements of the blank 10 whose bottom plate 11 is octagonal are the same as those of the rectangular blank 10 described previously, so a description of the structure of the octagonal blank 10 will be omitted.

The flanged paper container 50 with a hexagonal bottom plate 11 and the flanged paper container 50 with an octagonal bottom plate 11 are assembled in the same manner as the flanged paper container 50 with a rectangular bottom plate 11. Therefore, I will omit the explanation.

Note that the constituent elements of the blank 10 in the case where the bottom plate 11 is a polygon having an even number of corners greater than or equal to a decagonal shape are the same as the constituent elements of the rectangular blank 10 described previously. In that case as well, it is desirable that the internal angles of the bottom plate 11 have the same size.

FIG. 10 is an enlarged view of the even-numbered side plates 14 and both ends of the rectangular flanged paper container 50 of FIG. 7, and the flange 52 of the flanged paper container 50 is viewed from the bottom side. This is a diagram in the middle of assembling the rectangular flanged paper container 50, at a stage immediately before folding the respective edge folded portions 16, 17 and joining them to the respective edge piece upper portions 13, 15, etc. be.

FIG. 11 is an enlarged view of the even-numbered side panels 14 and both ends of the flanged paper container 50 after completion of the processing steps shown in FIG. 10.

At each corner of the flange 52 of the flanged paper container 50 shown in FIG. are overlapped and joined by heat sealing, and the valleys of the side edges 43 of the even-numbered side panels 14 are placed at the gathering point A, which is the upper part of the mountain fold line of the side edges 33 of the odd-numbered side panels 12. The assemblage point B, which is the upper part of the fold line, overlaps.

Furthermore, since the gathering point A is the end of the notch 132 in the odd-numbered edge piece upper part 13, it is exposed on the end face of the blank 10, which causes a through hole to occur.
Furthermore, since the gathering point B is the intersection of the outer edge 152 of the end portion 151 of the even-numbered upper edge piece 15 and the outer edge 142 of the even-numbered folded joining plate 141, it is exposed on the end surface of the blank 10. This causes the formation of through holes.

Since the aggregation points A and B, both of which have the risk of forming a through hole, overlap, there is a risk of forming a through hole at the corner of the flange. Therefore, at the stage of FIG. 10 where the respective edge folded portions 16 and 17 are not folded back and heat sealed, there is a possibility that a through hole will be formed at the position where the gathering points A and B overlap. .

Here, the intersection of the outer side 38 of the odd-numbered edge folded portion 16 and the inner side 39 of the protrusion 18 of the odd-numbered edge folded portion 16 is defined as a corner E, and the angle is defined as an angle θE. shall be. (Figure 2, Figure 4, Figure 6).

Furthermore, by assembling the flanged paper container 50, the corner E of the odd-numbered folded portion 16 is located in the vicinity of the gathering points A and B of the flanges 52. It will be facing the corner part. The corner portion is defined by the angle of the flange 52 at which the odd-numbered folding joint plate 121 and the odd-numbered side plate 12 are bent via the side edge 33 of the odd-numbered side plate 12. This is a nearby angle, and this angle is defined as angle θG. (Fig. 10, Fig. 11, Fig. 12, Fig. 13).
Further, the angle θG is approximately the same angle as the angle θF of the internal angle of the corner F of the bottom plate 11 closest to the corner E and the gathering points A and B.

This is because when the body portion 51 of the flanged paper container 50 is cut along any horizontal plane (a plane parallel to the bottom plate), every cut plane has a substantially similar shape to the bottom plate. Further, since the bottom plate 11 and the flange 52 are substantially parallel, the bending angle θG of the body 51 near the flange 52 (inner angle of the horizontal cross section of the body) is the side of the odd-numbered side plate 12. The angle θF of the corner F of the bottom plate 11 connected to the lower end of the side 33 is approximately the same angle.

In addition, in terms of design, the angle θE, the angle θF, and the angle θG can be made to be the same size, but considering that the material of the paper container is soft and the assembly accuracy is not high, the angle θE and the angle θG It is written that the angle θF and the angle θG are substantially the same angle.

In the blank 10, by making the angle θE and the angle θF substantially the same angle, the outer edge 38 of the odd-numbered edge folded portion 16 and the protrusion 18 of the odd-numbered edge folded portion 16 are Since the inner side 39 can approach the body 51 of the flanged paper container 50, it is preferable in terms of appearance, and the flange 52 of the flanged paper container 50 can be further strengthened.

In this embodiment, the angle θE and the angle θF are approximately the same angle, and the width of the odd-numbered edge folded portion 16 is approximately the same as the width of the odd-numbered edge piece upper portion 13, and the set Since the points A and B are arranged so that they almost coincide with the corner E, as shown in FIG. 16, the odd-numbered edge folded portions 16 and/or the protrusions 18 of the odd-numbered edge folded portions 16 are used to form through holes that may occur at the gathering points A and B from the lower surface side. It can be blocked.

Here, it is desirable that the angle θE and the angle θF be approximately the same angle, but if angle θE>angle θF, it is desirable that the difference be 30° or less. More preferably, the difference is 15° or less.
In the case of angle θE>angle θF, the inner side 39 of the protrusion of the odd-numbered edge folded portion and the odd-numbered folded joint plate 121 are further connected to the outer edge 38 of the odd-numbered edge folded portion. Since it is difficult for the odd-numbered side plates 12 to come into contact with each other, the corner E and the corner F tend to come close to each other. Therefore, the difference may be large to some extent.

When angle θE<angle θF, it is desirable that the difference is 15° or less. More preferably, the difference is 8° or less.
In the case of angle θE<angle θF, the inner side 39 of the protrusion of the odd-numbered edge folded portion and the odd-numbered folded joint plate 121 are further connected to the outer edge 38 of the odd-numbered edge folded portion. Since the odd-numbered side plates 12 are likely to come into contact with each other, the corner E and the corner F are difficult to approach. Therefore, it is desirable that the difference be smaller.

Here, the width of the odd-numbered edge folded portion is defined as the width of the outer edge 38 of the odd-numbered edge folded portion 16 that does not include the protrusion 18 and the outer edge 36 of the odd-numbered edge folded portion 13. It is distance.

In the flanged paper container 50, by making the angle θE and the angle θG substantially the same angle, the outer side 38 of the odd-numbered edge folded portion 16 and the protrusion of the odd-numbered edge folded portion 16 Since the inner side 39 of the portion 18 can approach the body 51 of the flanged paper container 50, it is preferable in terms of appearance, and the flange 52 of the flanged paper container 50 can be further strengthened.

Here, it is desirable that the angle θE and the angle θG be approximately the same angle, but if angle θE>angle θG, it is desirable that the difference be 30° or less. More preferably, the difference is 15° or less.
In the case of angle θE>angle θG, the inner side 39 of the protrusion of the odd-numbered edge folded portion and the odd-numbered folded joint plate 121 are further connected to the outer edge 38 of the odd-numbered edge folded portion. Since it is difficult for the odd-numbered side plates 12 to come into contact with each other, the corner E and the corner F tend to come close to each other. Therefore, the difference may be large to some extent.

When angle θE<angle θG, it is desirable that the difference is 15° or less. More preferably, the difference is 8° or less.
In the case of angle θE<angle θG, the inner side 39 of the protrusion of the odd-numbered edge folded portion and the odd-numbered folded joint plate 121 are further connected to the outer edge 38 of the odd-numbered edge folded portion. Since the odd-numbered side plates 12 are likely to come into contact with each other, the corner E and the corner F are difficult to approach. Therefore, it is desirable that the difference be smaller.

In this embodiment, the angle θE and the angle θG are approximately the same angle, and the width of the odd-numbered edge folded portion 16 is approximately the same as the width of the odd-numbered edge piece upper part 13, and the set Since the points A and B are arranged so that they almost coincide with the corner E, as shown in FIG. 16, the odd-numbered edge folded portions 16 and/or the protrusions 18 of the odd-numbered edge folded portions 16 are used to form through holes that may occur at the gathering points A and B from the lower surface side. It can be blocked.

More desirably, the width of the odd-numbered edge folded portion 16 is made slightly larger than the width of the odd-numbered edge piece upper part 13, thereby ensuring that through-holes that may occur at the gathering points A and B are prevented. can be blocked. It is desirable that the width of the odd-numbered edge folded portion 16 be 105% to 120% of the width of the odd-numbered edge piece upper portion 13. If it is smaller than 105%, there is a risk that the reliability of closing the through hole will be poor, and if it is larger than 120%, the interference between the odd-numbered edge folded portions 16 and the body portion 51 of the flanged paper container 50 will be strong, There is a possibility that the molding of the container will be adversely affected.

Further, it is desirable that the width of the odd-numbered edge folded portion 16 is set to be 0.5 mm larger to 2 mm larger than the width of the odd-numbered edge piece upper part 13. If it is smaller than 0.5 mm, there is a possibility that the reliability of closing the through hole will be poor, and if it is larger than 2 mm, the interference between the odd-numbered edge folded portions 16 and the body portion 51 of the flanged paper container 50 will be strong. There is a possibility that the molding of the container will be adversely affected.

Further, the side edges 37 at both ends in the direction along the edge of the flanged paper container 50 of the odd-numbered edge folded portions 16 and the flanged edges of the even-numbered edge folded portions 17 opposite to the side edges 37 are provided. It is desirable that the distance (gap) between the side edges 47 at both ends in the direction along the edge of the paper container 50 is 0.2 mm or more and 3 mm or less.

When the flanged paper container 50 is molded to form the flange 52, it is preferable that the gap between the odd-numbered edge folded portions 16 and the even-numbered edge folded portions 17 be small. A small gap increases the area of the flange 52 where two stacked blanks 10 are formed, thereby strengthening the flange 52. Moreover, since the gap is small, the appearance is also improved.

If the gap exceeds 3 mm, the strength of the flange will be significantly reduced and the appearance will be poor. Furthermore, if the gap is less than 0.2 mm, there is a risk that the odd-numbered edge folded portions 16 and the even-numbered edge folded portions 17 may overlap due to an error when assembling the flanged paper container 50. be. If the thickness of the overlapping portion becomes large and the uniformity of the flange thickness is poor, stability will be lacking when the lid material is joined. In addition, since the side edges 37 and 47 of the overlapping upper edge folded portion become noticeable, a step may be formed there, which may become a trigger for peeling off.

FIG. 12 is an enlarged view of the even-numbered side plates 14 and both ends of the octagonal flanged paper container 50 in FIG. Viewed from the bottom side. This is a diagram in the middle of assembling the flanged paper container 50, and shows the stage immediately before the folded edge portions 16 and 17 are bent and joined to the upper edge portions 13 and 15, etc.

FIG. 13 shows a state in which the flanged paper container 50 is completed by proceeding with the processing steps from FIG. 12 and bending the folded edges 16 and 17 and joining them to the upper edges 13 and 15, etc. .

Since the bottom plate 11 and the rectangular blank 10 described previously are the same as the function and effect of closing the through holes, a description thereof will be omitted.

It is preferable that the width of the joining edge piece 122 is narrower than the width of the even-numbered edge piece upper part 15. This is done by making sure that the outer edge 46 of the even-numbered upper edge piece 15 and the joining edge piece 122 do not overlap when viewed from the top side, thereby making the outer edge 46 of the even-numbered upper edge piece 15 into a valley. This is because when folding, the even-numbered edge folded portions 17 can be folded smoothly.

It is preferable that the width of the joining edge piece 122 is narrower than the width of the even-numbered edge piece upper part 15 by 0.5 mm to 2 mm. If this value is smaller than 0.5 mm, and the assembly accuracy of the flanged paper container 50 is poor, the outer edge 46 of the even-numbered upper edge piece 15 and the joining edge piece 122 will overlap, and the There is a possibility that the bending of the even-numbered edge folded portions 17 will be hindered. Moreover, if this value is larger than 3 mm, an effective bonding area cannot be obtained, and the bonding force between the bonding edge piece 122 and the even-numbered edge piece upper part 15 will be poor.

Here, the material of the blank 10 will be explained. The blank 10 is a laminate in which a thermoplastic resin layer is provided on one or both sides of a paper base layer mainly made of paper. The paper used is paperboard such as white ball, manila ball, cup paper, card paper, or ivory paper. Paper used for food containers should preferably not contain recycled paper. The basis weight of the paper is appropriately determined depending on the container size and purpose, but it is preferable to use paper of 150 to 400 g/m ² . If it is less than 150 g/m ² , the rigidity of the container will be low and it will be easily deformed. Moreover, if it exceeds 400 g/m ² , the thickness of the blank 10 increases, so that line cracks are likely to occur when folding along the ruled lines. Additionally, excessive basis weight of paper increases costs.

Moreover, a film layer may be provided in the intermediate layer, if necessary.
When water vapor barrier properties and oxygen barrier properties are required for the flanged paper container 50, aluminum foil, aluminum-deposited polyethylene terephthalate, polyvinylidene chloride film (PVDC), polyvinyl alcohol film (PVA) can be used as the gas barrier layer and film layer. , ethylene vinyl alcohol copolymer film (EVOH), gas barrier nylon film, gas barrier polyethylene terephthalate film, and other gas barrier films, as well as polyethylene terephthalate films and other inorganic oxides in which inorganic oxides such as aluminum oxide and silicon oxide are vapor-deposited. A gas barrier coating layer such as a polyvinylidene chloride coating, a film containing a water-soluble resin and an inorganic layered compound, or a resin layer formed by reacting a metal alkoxide or its hydrolyzate with an isocyanate compound may be used. I can do it.

The thermoplastic resin layers provided on both sides of the paper base material layer are used to bond the flanged paper container 50 at the necessary locations to maintain its shape, and to sufficiently bond the necessary locations to maintain the shape of the flanged paper container 50 to maintain the shape of the container. It has the role of preventing leakage. In the flanged paper container 50 of this embodiment, it is not necessary to join the body 51 of the flanged paper container to prevent leakage of the contents, but the members of the flanges 52 are sufficiently joined to each other to prevent the contents from leaking. must be prevented from leaking. The material for the thermoplastic resin layer is preferably a polyethylene resin, such as low density polyethylene (LDPE), linear low density polyethylene (L-LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), Ethylene-vinyl acetate copolymer (EVA), ionomer resin, ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene - Methyl methacrylate copolymer (EMMA), acid-modified polyolefin resins made by modifying polyethylene resins with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid, polyvinyl acetate Examples include resins, and additives may be added as appropriate. Alternatively, a multilayer structure consisting of LDPE/MDPE/LDPE or LDPE/HDPE/LDPE may be used.

In addition, when heat resistance is required, the thermoplastic resin layer can be made of polypropylene, and homopolypropylene, random polypropylene, block polypropylene, and a blend of two or three of the above resins can be used. . Furthermore, the polyethylene resin described in the previous paragraph can be blended with the above-mentioned single resin or blended resin in order to facilitate processing of the container. The container processing process is, for example, a process of coating a paper base layer with a thermoplastic resin layer or a process of assembling the container.
The amount of the polyethylene resin added is preferably 5% by weight to 50% by weight. If it is less than 5% by weight, no improvement in processability can be expected, and if it exceeds 50% by weight, a decrease in heat resistance is observed.

For applications that require higher heat resistance than polypropylene, such as heating oil-rich contents or cooking in a microwave or hot air oven while the container is in use, it is laminated to a paper base layer. A resin having a higher melting point may be used for the surface resin layer. As the above resin, for example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polymethylpentene resin (TPX), etc. can be used.

Unlike a paper cup, the flanged paper container 50 of this embodiment does not have a thread end, so unlike a paper cup, the thread end does not generate heat and burn when cooked in a microwave oven. Because of these characteristics, by using a more heat-resistant resin for the surface resin layer, the paper container becomes more suitable for microwave cooking.

Various bonding methods can be used for laminating the laminate of the blank 10, but preferably an extrusion coating method in which both or one side of a paper base layer mainly made of paper is coated with a molten thermoplastic resin. is desirable. When laminating a film to the paper base layer, a method suitable for the material to be processed is selected, such as dry lamination or extrusion coating.

The raw material of the blank 10 coated with the thermoplastic resin layer in the above step is sent to a punching step and punched into the shape of the blank 10. The punching method is a known punching method such as a Thomson punching method, a rotary die cutting method, a CAD cutting method, a laser cutting method, or a Dorsler method. The punching method is appropriately selected in consideration of production quantity, production speed, quality requirements, cost, etc. The punched blanks 10 are stacked in the same direction and stored.

To assemble the flanged paper container 50 of this embodiment from the blank 10, the odd-numbered side plates 12 and the even-numbered side plates 14 are bent to form a hollow container shape. Then, the side edge 34 of the odd-numbered folding joint plate 121 (opposite side to the odd-numbered side plate 12) and the side edge 44 of the even-numbered folding joint plate 141 (opposite side to the even-numbered side plate 14) is a common side, and by mountain-folding the side sides 34 and 44 of each of the folding joining plates as mountain fold lines, the area near the outer edge 35 of the odd-numbered folding joining plate 121 and the even-numbered folding The inner surfaces near the outer edge 142 of the bonding plates 141 are continuously heat-sealed from the side edges 33 of the odd-numbered side plates 12 to the side edges 43 of the even-numbered side plates 14.

By doing this, in the odd-numbered folded joint plates 121 and the even-numbered folded joint plates 141, the notches 123 on the outer edge side of the blank 10 of the odd-numbered folded joint plates 121, It is possible to prevent the contents from leaking through the outer edges 142 of the even-numbered folded joint plates 141.

Next, with the odd-numbered folded joint plates 121 and the even-numbered folded joint plates 141 overlapped by heat sealing, the even-numbered folded joint plates 141 are placed on the outer surface side of the even-numbered side plates 14. Fold them toward the even-numbered side plates 14 so that they face each other. The odd-numbered upper edge piece 13, the even-numbered upper edge piece 15, and the joint edge piece 122 are valley-folded, respectively, and the odd-numbered folded joint plate 121 and the even-numbered folded joint plate 141 are heat-sealed. are superimposed on the even-numbered side plates 14.

Then, the upper surface of the joining edge piece 122 and the lower surface of the even-numbered edge piece upper part 15 come to face each other, and the upper surface of the joining edge piece 122 and the lower surface of the even-numbered edge piece upper part 15 are heated. Sealed. Furthermore, by bending the odd-numbered side plates 12 and the even-numbered side plates 14 so that their side edges 33 and 34 are aligned with each other, the ends 131 of the odd-numbered upper edge pieces 13 are The upper surface and the lower surface of the end 151 of the even-numbered edge piece upper part 15 face each other, and the upper surface of the end 131 of the odd-numbered edge piece upper part 13 and the lower surface of the end 151 of the even-numbered edge piece upper part 15 face each other. is heat sealed.

Furthermore, by valley-folding the outer edge 36 of the odd-numbered edge piece upper part 13 and folding back the odd-numbered edge piece folded-back part 16, the lower surface of the odd-numbered edge piece folded-back part 16 and the odd-numbered The lower surface of the upper edge piece 13, the lower surface of the joining edge piece 122, the lower surface of the end portion 131 of the odd-numbered edge piece upper part 15, and the lower surface of the even-numbered edge piece upper part 15 are heat-sealed.

Further, by valley-folding the outer edge 46 of the even-numbered edge piece upper part 15 and folding back the even-numbered edge piece folded-back part 17, the lower surface of the even-numbered edge piece folded-back part 17 and the joining edge are folded. The lower surface of the piece 122, the lower surface of the end portion 131 of the odd-numbered upper edge piece, and the lower surface of the even-numbered upper edge piece 15 are opposed to each other. Then, the lower surface of the even-numbered edge folded portion 17, the lower surface of the joining edge piece 122, the lower surface of the end portion 131 of the odd-numbered edge piece upper part, and the lower surface of the even-numbered edge piece upper part 15 are heated. Sealed. By the above-described procedure, a flanged paper container 50 is assembled, which includes a flange 52 that continues in a circumferential manner and is reinforced by a folded edge portion, and has an opening at the top surface.

Note that the method for assembling the flanged paper container 50 described above includes a joining step at each location. When the layer structure of the laminate of the blank 10 includes thermoplastic resin layers on both the front and back sides, heat sealing is preferable as the bonding method. Heat-sealing methods include blowing hot air and pressurizing, pressing a high-temperature heater bar against it, ultrasonic welding, high-frequency welding, heating and pressurizing with infrared rays, and other known methods as appropriate. selected.

Moreover, the laminate of the blank 10 may be provided with a thermoplastic resin layer on one side without providing a thermoplastic resin layer on both sides. Although the thermoplastic resin layer is provided on the surface, it may be provided on the inner surface of the flanged paper container 50, or may be provided on the outer surface. If the main purpose is to prevent the content from seeping out, it may be provided on the inner surface, and if the main purpose is to prevent seepage from the outside or condensation on the outer surface of the container, it may be provided on the outer surface.

When a thermoplastic resin layer is provided on one side, the bonding interface may be a combination of a paper base layer and a thermoplastic resin layer. In this case, depending on the material of the thermoplastic resin layer, it can be bonded as is without treatment. However, if bonding is not possible without treatment, surface treatment of the paper base layer or bonding using an adhesive is performed. Moreover, the portions where the bonding interface is between the paper base layers can be bonded using an adhesive. If the sealing performance of the paper container is low and the contribution to shape retention is also low, it may be left unbonded.

If thermoplastic resin layers are not used on both sides, all bonding interfaces will be a combination of layers that cannot be thermally welded, so each surface layer will be surface-treated or bonded using an adhesive.

The structure of the blank shape and the method of assembling the paper containers for hexagonal flanged paper containers and octagonal flanged paper containers are the same as for the rectangular flanged paper containers explained previously, so we will explain them here. will be omitted.
Further, the material and manufacturing method of the blanks for the hexagonal flanged paper container and the octagonal flanged paper container are the same as those for the rectangular flanged paper container described previously, so a description thereof will be omitted.
Furthermore, the method for assembling the hexagonal flanged paper container and the octagonal flanged paper container is the same as that for the rectangular flanged paper container described previously, so a description thereof will be omitted.

Further, when the number of corners of the bottom plate 11 is an even number and the sizes of the internal angles are the same, the opposing sides of the flanged paper container 50 are parallel.
In addition, since each component (plate, side, etc.) of the blank 10 is symmetrical in the vertical and horizontal directions, the shape of the molded paper container 50 with flanges is also symmetrical, resulting in a stable appearance.

As explained above, in the flanged paper container of the present invention, the flange can be strengthened by folding back the folded edge portion.
Further, since the outer edge of the flange is the edge of the folded stack of blanks, the cross section of the blank is not exposed. Therefore, liquid and the like do not penetrate through the edge of the flange, so that the decrease in strength of the flange-equipped paper container can be reduced.
Furthermore, since no through holes are formed in the flange, the contents do not leak through the through holes of the flange when the contents are filled and the lid material is sealed, thereby providing a flanged paper container with excellent sealing performance. I can do it.

10 Blank 11 Bottom plate 12 Odd numbered side plate 121 Odd numbered folded joining plate 122 Joining edge piece 124 Outer edge of joining edge piece 13 Odd numbered edge piece upper part 131 Odd numbered edge piece upper end 132 Odd numbered edge Notch 133 at the top of one side Outer edge 14 of the odd-numbered folded joint plate 14 Even-numbered side plate 141 Even-numbered folded joint plate 142 Outer edge 15 of the even-numbered folded joint plate Upper part of the even-numbered edge piece 151 Upper part of the even-numbered edge piece End portion 152 Outer edge 16 of the upper end of the even-numbered edge piece Odd-numbered edge folded-back portion 17 Even-numbered edge-folded portion 18 Protrusion portion 31 of the odd-numbered edge folded-back portion Odd-numbered bottom plate side edge 32 Outer edge 33 of odd-numbered side plate Side edge 34 of odd-numbered side plate Side edge of odd-numbered folded joint plate (opposite side to odd-numbered side plate)
35 Outer side of the odd-numbered folded joint plate 36 Outer side of the upper part of the odd-numbered edge piece 37 Side edge of the odd-numbered edge folded part 38 Outer side of the odd-numbered edge piece folded part 39 Odd-numbered edge folded part The inner side of the protrusion 41 The side edge of the even-numbered bottom plate 42 The outer edge of the even-numbered side plate 43 The side edge of the even-numbered side plate 44 The side edge of the even-numbered fold-in joint plate ( opposite side)
46 Outer edge of the upper part of the even numbered edge piece 47 Side edge of the even numbered edge piece folded part 48 Outer edge of the even numbered edge piece folded part 50 Flanged paper container 51 Body part 52 Flange 60 Blank 61 Bottom plate 62 1st Side plate 621 First folded joint plate 622 Joint edge piece 623 Seal part 624 Joint edge piece outer edge 625 Separation seal part 63 First edge piece 631 First peninsular piece 632 First peninsular piece notch 633 Branched notch 64 Second side Face plate 641 Second folded joint plate 642 Second folded joint plate outer edge 65 Second edge piece 651 Second peninsular piece 652 Second peninsular piece outer edge 66 Projection piece 71 Bottom plate first side edge 72 First side plate outer edge 73 First side plate side 74 First folding joint plate side (opposite side to the first side plate)
75 First folding joint plate outer edge 81 Bottom plate second side edge 82 Second side plate outer edge 83 Second side plate side edge 84 Second folding joint plate side edge (opposite side to the second side plate)
90 Paper container with flange 91 Body part 92 Flange

A Odd-numbered side plate gathering point B Even-numbered side plate gathering point E Corner between the inside side of the protrusion of the odd-numbered edge folded part and the outer edge of the odd-numbered edge folded part F Odd-numbered bottom plate Corner H between the side edge and the side edge of the even-numbered bottom plate End point L of the side edge of the odd-numbered edge folded portion in the outer direction of the blank First side plate gathering point M Second side plate gathering point θE Even-numbered side edge Angle θF formed by the inner side of the protrusion of the folded edge part and the outer edge of the even-numbered folded edge part The angle θF between the inner side of the protrusion of the even-numbered folded edge part and the outer edge of the even-numbered folded edge part Angle θG of the corner of the bottom plate closest to the corner formed by the formed paper container Angle formed by the odd-numbered side plate and the odd-numbered folded joint plate near the flange of the formed paper container

Claims (6)

For flanged paper container blanks,
The blank includes an n-gon-shaped bottom plate having an even number of corners of 4 or more,
One of the n sides of the bottom plate is a first bottom plate side edge, and the side of the bottom plate adjacent to the first bottom plate side edge in one direction is a second bottom plate side edge. , and thereafter sequentially from the third bottom plate side to the nth bottom plate side,
Odd-numbered side plates are connected to each of the odd-numbered side edges of the bottom plate via the mountain fold line, and even-numbered side plates are connected to each of the even-numbered side edges of the bottom plate via the mountain fold line. are installed in succession,
One of the odd-numbered folded joint plates having an inverted triangular shape with respect to the corner of the bottom plate through a mountain fold line on each side of the odd-numbered side plates located on both sides in the circumferential direction of the blank. with sides of
One of the even-numbered folded joint plates having an inverted triangular shape with respect to the corner of the bottom plate through valley fold lines on each of the sides of the even-numbered side plates located on both sides in the circumferential direction of the blank. with sides of
The other side of the odd-numbered folded joint plate arranged in the circumferential direction of the blank and the other side arranged in the circumferential direction of the blank of the even-numbered folded joint plate are formed on a mountain fold line. forming a common side,
Each of the odd-numbered folded joint plates has a joint edge piece connected to the outer edge of the odd-numbered folded joint plate on the side that becomes the edge of the flanged paper container via a valley fold line,
Each of the odd-numbered side plates has an upper part of the odd-numbered edge piece connected to the outer edge of the odd-numbered side plate on the side that will become the edge of the flanged paper container via a valley fold line. established,
End portions of the odd-numbered edge piece upper portions are provided extending from both ends of the odd-numbered edge piece upper portions in a direction along the edge of the flanged paper container,
An upper portion of an even-numbered edge piece is connected to the outer edge of the even-numbered side plate on the side that is the edge of the flanged paper container of the even-numbered side plate via a valley fold line,
An end portion of the even-numbered upper edge piece is provided extending from both ends of the even-numbered upper edge piece in a direction along the edge of the flanged paper container,
Each of the odd-numbered upper edge pieces is provided with an odd-numbered edge folded portion on the outer edge of the odd-numbered upper edge piece on the side that becomes the edge of the flanged paper container via a valley fold line. are set up in succession,
A protrusion protruding toward the outside of the blank extends from at or near both ends of the odd-numbered edge folded portion,
An inner side of the protrusion extending toward the inner side of the blank from an end point H in the outer direction of the blank on both sides of the odd-numbered edge folded portion, and an outer edge of the odd-numbered edge folded portion. The angle θE of the corner E formed by the outer edge and the angle θF of the corner F of the bottom plate that is located closest to the corner E among the corners of the bottom plate are approximately the same angle. ,
Each of the even-numbered upper edge pieces is provided with an even-numbered edge folded portion extending through a valley fold line on the outer edge of the even-numbered upper edge piece on the side that will become the edge of the flanged paper container. A blank for a paper container with flanges, characterized in that: When assembling the flanged paper container,
The odd-numbered edge folded portion and/or the protrusion of the odd-numbered edge folded portion are located near the joint between the odd-numbered edge piece upper portion and the even-numbered edge piece upper portion,
The inner end point of the blank of the notch at the upper end of the odd-numbered edge piece, the mountain fold line on the side edge of the odd-numbered side plate, and the valley fold line on the outer edge of the odd-numbered side plate Assemblage point A with
Closing any through holes that may occur when the outer edge of the upper end of the even-numbered edge piece and the gathering point B, which is the intersection of the outer edge of the even-numbered folded joint plate, overlap or come close to each other. The flanged paper container blank according to claim 1, characterized in that: In the width of the blank in the direction from the inside to the outside, the width of the folded portion of the odd-numbered edge piece is 105% or more and 120% or less of the width of the upper part of the odd-numbered edge piece. The flanged paper container blank according to claim 1 or 2. A flanged paper container formed by assembling the flanged paper container blanks according to any one of claims 1 to 3. A protrusion protruding toward the outside of the blank extends from at or near both ends of the odd-numbered edge folded portion,
An inner side of the protrusion extending toward the inner side of the blank from an end point H in the outer direction of the blank on both sides of the odd-numbered edge folded portion, and an outer edge of the odd-numbered edge folded portion. The angle θE of the corner E formed by the outer side is
The flanged paper container according to claim 4, wherein in the vicinity of the flange of the flanged paper container, angles θG formed by odd-numbered side plates and odd-numbered folded joint plates are substantially the same angle. . Side sides at both ends in a direction along the edge of the flanged paper container of the odd-numbered folded portion, and a direction along the edge of the flanged paper container of the even-numbered edge folded portion opposite to the side sides. 6. The flanged paper container according to claim 4, wherein the distance between both ends of the container is 0.2 mm or more and 3 mm or less.

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