WO2024048223A1

WO2024048223A1 - Bag and method for manufacturing bag

Info

Publication number: WO2024048223A1
Application number: PCT/JP2023/028981
Authority: WO
Inventors: 充楫間
Original assignee: 有限会社キーロ
Priority date: 2022-08-29
Filing date: 2023-08-08
Publication date: 2024-03-07
Also published as: JP7239232B1; JP2024032247A

Abstract

A body 2 of a bag 1 is formed by joining two sheet-like members (11, 12) and comprises a lower wall region 13, a front wall region 14, a rear wall region 15, a left wall region 16, and a right wall region 17. The front wall region 14, the rear wall region 15, the left wall region 16, and the right wall region 17 extend upward from the lower wall region 13. The front wall region 14 and the rear wall region 15 are arranged to face each other. The left wall region 16 and the right wall region 17 are arranged to face each other. The front wall region 14, the right wall region 17, the rear wall region 15, and the left wall region 16 are arranged circularly in this order. A joint portion 10 between the two sheet-like members (11, 12) is positioned to intersect each of the left wall region 16, the right wall region 17, and the lower wall region 13 diagonally.

Description

Bags and bag manufacturing methods

The present invention relates to a bag and a bag manufacturing method.

Conventionally, joints such as seams in the main body of a bag for storing articles have been provided vertically or horizontally at bent portions such as between the bottom wall and the side walls and between the side walls.

JP 2000-333715 specification

However, there is a disadvantage that objects placed in the main body of the bag are likely to hit the joints at the bent portions, and if the joints are located at the bent portions as in the past, the joints are likely to be destroyed. Furthermore, if the joint is parallel to the bent portion, there is a disadvantage that the load caused by the object is likely to be concentrated, and the joint is likely to be destroyed by the object.

The present invention has been made in view of the above circumstances, and its purpose is to provide a bag that does not easily come off at the joint even if an object hits the bent portion of the main body.

The bag of the first invention is a bag, the bag includes a main body for storing an object, the main body is formed by joining two sheet-like members, and the main body has a lower wall area. and a front wall region, a rear wall region, a left wall region, and a right wall region, the front wall region, the rear wall region, the left wall region, and the right wall region extending upward from the lower wall region, The front wall region and the rear wall region are arranged to face each other, the left wall region and the right wall region are arranged to face each other, and the front wall region, the right wall region, the back wall region, and the left wall region are arranged in order in an annular shape. In this bag, the two sheet-like members are arranged side by side, and the joint portions of the two sheet-like members are positioned so as to diagonally cross the left wall region, the right wall region, and the lower wall region, respectively.

According to this configuration, the joint portions of the two sheet-like members are located diagonally across the left wall region, right wall region, and bottom wall region, so that a load is applied to the bent portion of the bag. The joint does not easily come off even when exposed to pressure. That is, for example, the bent portion between the front wall region and the right wall region, the bent portion between the right wall region and the rear wall region, the bent portion between the rear wall region and the left wall region, the left wall region Even if force is applied to the bent portion between the front wall region, the lower wall region and the front wall region, or the rear wall region, the joint portion is not likely to come off because the joint portion does not exist in the bent portion. In addition, since the joint is inclined with respect to the bent part, the load is less likely to concentrate and the joint is less likely to come off.

Preferably, a corner is formed at the opening at the upper end of the main body by folding and joining the sheet-like members so as to convex outward.

According to this configuration, a corner is formed in the opening at the upper end of the main body by folding and joining the sheet-like members so that they are convex toward the outside at the upper end of the main body. A strong corner can be formed at the opening.

Preferably, each of the right wall region and the left wall region is curved, so that the upper part of each joint in the right wall region and the left wall region is directed toward either the front wall region or the rear wall region. The lower part of each joint in the right wall region and the left wall region extends in a convex curve in a direction opposite to the upper part. There is.

According to this configuration, the upper and lower parts of each joint in the right wall region and the left wall region are bent in opposite directions, so compared to a case where the joints are completely straight, it is easier to bend from the front wall region side. It is easy to prevent the joint from being destroyed by flexibly absorbing the force from the rear wall region and the force from the rear wall region.

A bag manufacturing method of a second invention is a bag manufacturing method for manufacturing a bag using a first sheet-like member and a second sheet-like member as materials, wherein the first sheet-like member is , including a quadrangular front wall region, a triangular first right region, a triangular first left region, and a triangular first bottom region, and the front wall region has a first right side and a first right side region. a first left side opposite to the right side of 1; a first upper side extending from the top of the first right side to the top of the first left side; and a first top side extending from the bottom of the first right side to the bottom of the first left side. a first lower side, a first right area extends continuously from the first right side, and the first right area extends from the first right vertex and the first right side from the upper end of the first right side. a first right hypotenuse extending to the right apex of the first right area; and a first right base extending from the lower end of the first right side to the first right apex; gradually widens from the upper end of the right side to the lower end of the first right side, the first left area continuously expands from the first left side, and the first left area is a left vertex, a first left hypotenuse extending from the lower end of the first left side to the first left vertex, and a first left base extending from the upper end of the first left side to the first left vertex. , the width of the first left area gradually increases from the lower end of the first left side to the upper end of the first left side, and the first lower area continuously widens from the first lower side. and the first lower region includes a first lower apex, a first lower oblique side extending from the left end of the first lower side to the first lower apex, and a first lower oblique side extending from the right end of the first lower side to the first lower apex. the width of the first lower area gradually increases from the left end of the first lower side to the right end of the first lower side; and a first right base side, a first left oblique side, a first lower oblique side, and a first lower base side, respectively, and the second sheet-like member has a rectangular rear wall area, The rear wall region includes a second right region of the triangle, a second left region of the triangle, and a second bottom region of the triangle, and the rear wall region includes a second right side and a second right side opposite to the second right side. , a second upper side extending from the upper end of the second right side to the upper end of the second left side, and a second lower side extending from the lower end of the second right side to the lower end of the second left side. , a second right area extends continuously from the second right side, and the second right area has a second right apex and a second right area extending from the bottom end of the second right side to the second right apex. 2, and a second right base extending from the upper end of the second right side to the second right apex, and the width of the second right area is the width of the second right hypotenuse from the lower end of the second right side to the second The second left area gradually widens toward the top of the right side, and the second left area extends continuously from the second left side, and the second left area extends from the second left vertex and the second left side. a second left hypotenuse extending from the top end to the second left vertex; and a second left base extending from the bottom end of the second left side to the second left vertex; gradually widens from the upper end of the second left side to the lower end of the second left side, the second lower area continuously expands from the second lower side, and the second lower area , a second lower apex, a second lower oblique side extending from the right end of the second lower side to the second lower apex, and a second lower base side extending from the left end of the second lower side to the second lower apex. , the width of the second lower area gradually increases from the right end of the second lower side to the left end of the second lower side, and the second right hypotenuse, the second left hypotenuse, and the second The margin portion extends from each of the left bottom side of No. 2, the second lower oblique side, and the second lower bottom side, and the bag manufacturing method brings the second lower apex closer to the left end of the first lower side. and a step of joining the first lower oblique side and the second lower oblique side with the first lower apex close to the right end of the second lower side, and a step of joining the first right apex to the first lower apex. a step of joining the first right base and the first lower base while the second left vertex is close to the second lower vertex; and a step of joining the second left base and the second lower base while the second left vertex is close to the second lower vertex. The first right vertex is brought close to the lower end of the second right side, and the second right vertex is brought close to the upper end of the first right side. A step of joining the hypotenuse and the second right hypotenuse, and a state in which the first left vertex is brought close to the upper end of the second left side, and the second left vertex is brought close to the lower end of the first left side. The bag manufacturing method includes the step of joining the first left hypotenuse and the second left hypotenuse.

According to this configuration, the joint portions of the two sheet-like members are arranged diagonally across the two side wall regions and the bottom wall region of the bag, so that no load is applied to the bent portion of the bag. Also, the joints are difficult to come off. In other words, since there are no joints on the first right side, first left side, first lower side, second right side, second left side, and second lower side, which are the bent parts, no force is applied to these bent parts. The joint does not easily come off even if

Preferably, in the bag manufacturing method, the first sheet-like member is folded and joined so as to convex outward over a first distance from the upper end of the first left side along the first left side. and a step of joining the second sheet-like member in a state in which it is folded so as to be convex outward over a second distance from the upper end of the second right side along the first right side.

According to this configuration, a corner is formed in the opening at the upper end by folding and joining the sheet-like members so that they are convex outward at the upper ends of the first left side and the second right side. , it is possible to form a strong corner in the opening with a simple structure.

According to the present invention, it is possible to provide a bag that does not easily come off at the joint even if an object hits the bent portion of the main body.

FIG. 1 is a perspective view of a bag according to an embodiment of the present invention. FIG. 2 is a left side view of the bag shown in FIG. 1. FIG. 3 is a right side view of the bag shown in FIG. 1. FIG. 4 is a bottom view of the bag shown in FIG. 1. FIG. 5 is an exploded plan view of the first sheet-like member and the second sheet-like member before manufacture. FIG. 6 is a plan view of a state in which the first sheet-like member and the second sheet-like member of FIG. 5 are partially joined.

Hereinafter, a bag according to an embodiment of the present invention will be described. FIG. 1 is a perspective view of a bag 1 of this embodiment. FIG. 2 is a left side view of the bag 1. FIG. 3 is a right side view of the bag 1. FIG. 4 is a bottom view of the bag 1. The bag 1 includes a main body 2 for storing objects, and two handles 3 attached to the main body 2. The main body 2 is generally a rectangular parallelepiped, and has an opening at the top.

The main body 2 is formed by bending and joining a first sheet-like member 11 and a second sheet-like member 12. In this embodiment, joining is achieved by suturing using thread, but other means are also possible, such as joining using adhesive. The first sheet-like member 11 and the second sheet-like member 12 are made of, for example, leather or cloth, but are not limited to these.

The main body 2 includes a lower wall region 13, a front wall region 14, a rear wall region 15, a left wall region 16, and a right wall region 17. The lower wall region 13 is a region that extends horizontally at the bottom of the bag 1 and forms the bottom. A front wall region 14, a rear wall region 15, a left wall region 16 and a right wall region 17 extend upwardly from the lower wall region 13 at generally right angles. A front wall region 14 located on the front side and a rear wall region 15 located on the rear side are arranged to face each other. A left wall region 16 located on the left side and a right wall region 17 located on the right side are arranged to face each other. As a result, the front wall region 14, the right wall region 17, the rear wall region 15, and the left wall region 16 are arranged in order in an annular shape.

As shown in FIGS. 2 to 4, the joint 10 between the first sheet-like member 11 and the second sheet-like member 12 connects the left wall region 16, right wall region 17, and lower wall region 13 diagonally. It is located so that it crosses the shape of the river. That is, the first sheet-like member 11 covers the entire front wall region 14 in FIG. 1, half of the lower wall region 13 in FIG. 4, half of the left wall region 16 in FIG. 2, and right wall region in FIG. It forms half of 17. The second sheet-like member 12 covers the entire rear wall region 15 in FIG. 1, half of the bottom wall region 13 in FIG. 4, half of the left wall region 16 in FIG. 2, and half of the right wall region 17 in FIG. forming a half.

As shown in FIG. 1, at the upper end of the main body 2, by folding and joining the sheet-like members so as to convex outward, the left corner 18 and the right corner 19 are connected to the opening at the upper end of the main body 2. is formed.

As shown in FIGS. 2 and 3, each of the right wall region 17 and the left wall region 16 is curved, so that the upper part of each joint 10 in the right wall region 17 and the left wall region 16 is and the rear wall region 15 in a convexly bent curve, and the lower part of each joint 10 in the right wall region 17 and the left wall region 16 is opposite to the upper part. It extends in a convex curve in the direction.

More specifically, as shown in FIG. The lower half of the joint 10 extends toward the front wall region 14 in a convex curve. Furthermore, as shown in FIG. 3, the upper half of the joint 10 in the right wall region 17 extends toward the front wall region 14 in a convexly curved curve, and the upper half of the joint 10 in the right wall region 17 extends in a convex curve. The lower half extends toward the rear wall region 15 in a convexly bent curve.

Next, a bag manufacturing method for manufacturing the bag 1 using the first sheet-like member 11 and the second sheet-like member 12 as materials will be described. FIG. 5 is an exploded plan view of the first sheet-like member 11 and the second sheet-like member 12 before manufacture. First, a first sheet-like member 11 and a second sheet-like member 12 are prepared.

The first sheet-like member 11 includes a quadrangular front wall region 14, a right triangular first right region 21, a right triangular first left region 22, and a right triangular first lower region 23. include. The front wall region 14 includes a first right side 24 , a first left side 25 opposite to the first right side 24 , and a first side extending from an upper end 61 of the first right side 24 to an upper end 62 of the first left side 25 . The first lower side 27 extends from the lower end 63 of the first right side 24 to the lower end 64 of the first left side 25.

The first right area 21 extends continuously from the first right side 24 to the right side in FIG. The first right area 21 includes a first right apex 28 , a first right hypotenuse 29 extending from an upper end 61 of the first right side 24 to the first right apex 28 , and a lower end 63 of the first right side 24 . and a first right base 30 extending from the first right apex 28 to the first right apex 28 . The left and right width of the first right area 21 (the front and back width after manufacturing) gradually increases from the upper end 61 of the first right side 24 toward the lower end 63 of the first right side 24.

The first left area 22 extends continuously from the first left side 25 to the left side in FIG. The first left oblique side 32 extends from the top to the first left apex 31, and the first left bottom side 33 extends from the upper end 62 of the first left side 25 to the first left apex 31. The left and right width of the first left region 22 (front and back width after manufacturing) gradually increases from the lower end 64 of the first left side 25 toward the upper end 62 of the first left side 25.

The first lower region 23 extends continuously from the first lower side 27 to the lower side in FIG. 5 . The first lower region 23 includes a first lower apex 34 and a first lower oblique side 35 extending from the left end of the first lower side 27 (i.e., the lower end 64 of the first left side 25) to the first lower apex 34. and a first lower base side 36 extending from the right end of the first lower side 27 (that is, the lower end 63 of the first right side 24) to the first lower apex 34. The vertical width (width before and after manufacturing) of the first lower region 23 gradually increases from the left end of the first lower side 27 toward the right end of the first lower side 27.

A margin that becomes a seam allowance or an adhesive area by a certain width from each of the first right oblique side 29, the first right bottom side 30, the first left oblique side 32, the first lower oblique side 35, and the first lower bottom side 36. 37 is spreading.

The second sheet-like member 12 has a quadrangular rear wall region 15, a right triangular second right region 41, a right triangular second left region 42, and a right triangular second lower region 43. include. In addition, in the description of the second sheet-like member 12, the names "lower region, lower apex, upper end, lower end, upper side, and lower side" are given for convenience based on the positional relationship after manufacturing, so the positions shown in FIG. It is relatively high in the relationship. The rear wall region 15 includes a second right side 44 , a second left side 45 opposite to the second right side 44 , and a second side extending from an upper end 71 of the second right side 44 to an upper end 72 of the second left side 45 . It includes an upper side 46 and a second lower side 47 extending from the lower end 73 of the second right side 44 to the lower end 74 of the second left side 45 .

The second right area 41 extends continuously from the second right side 44 to the right side in FIG. The second right region 41 includes a second right vertex 48 , a second right hypotenuse 49 extending from the lower end 73 of the second right side 44 to the second right vertex 48 , and an upper end 71 of the second right side 44 . and a second right base side 50 extending from the second right apex 48 to the second right apex 48 . The left and right width of the second right area 41 (the width from front to back after manufacturing) gradually increases from the lower end 73 of the second right side 44 toward the upper end 71 of the second right side 44 .

The second left area 42 extends continuously from the second left side 45 to the left side in FIG. The second left region 42 includes a second left vertex 51 , a second left hypotenuse 52 extending from the upper end 72 of the second left side 45 to the second left vertex 51 , and a lower end 74 of the second left side 45 . and a second left base side 53 extending from the second left apex 51 to the second left apex 51 . The left and right width of the second left area 42 (the width from front to back after manufacturing) gradually increases from the upper end 72 of the second left side 45 toward the lower end 74 of the second left side 45.

The second lower region 43 extends continuously from the second lower side 47 to the upper side in FIG. 5 . The second lower region 43 includes a second lower apex 54 and a second lower oblique side 55 extending from the right end of the second lower side 47 (i.e., the lower end 73 of the second right side 44) to the second lower apex 54. and a second lower base side 56 extending from the left end of the second lower side 47 (that is, the lower end 74 of the second left side 45) to the second lower apex 54. The vertical width (width before and after manufacturing) of the second lower region 43 gradually increases from the right end of the second lower side 47 toward the left end of the second lower side 47.

A margin that becomes a seam allowance or an adhesive area by a certain width from each of the second right oblique side 49, the second left oblique side 52, the second left bottom side 53, the second lower oblique side 55, and the second lower bottom side 56. 37 is spreading.

FIG. 6 is a plan view of a state in which the first sheet-like member 11 and the second sheet-like member 12 are partially joined. After preparing the first sheet-like member 11 and the second sheet-like member 12, as shown in FIG. By joining the first lower oblique side 35 and the second lower oblique side 55 with the first lower apex 34 close to the right end of the second lower side 47, the joint portion 10 of the lower wall region 13 (see FIG. 4) is formed. The first lower region 23 and the second lower region 43 form the lower wall region 13 (FIG. 4). The margin portion 37 (FIG. 5) of the first lower oblique side 35 (FIG. 5) and the margin portion 37 (FIG. 5) of the second lower oblique side 55 are finally folded to be located inside the bag 1 (FIG. 1).

Next, with the first right apex 28 brought close to the first lower apex 34, the first right base side 30 and the first lower base side 36 are joined. The margin portion 37 of the first right bottom side 30 and the margin portion 37 of the first bottom bottom side 36 are folded so that they are finally located inside the bag 1 (FIG. 1).

Next, with the second left apex 51 brought close to the second lower apex 54, the second left base side 53 and the second lower base side 56 are joined. The margin portion 37 of the second left bottom side 53 and the margin portion 37 of the second lower bottom side 56 are finally folded to be located inside the bag 1 (FIG. 1).

Next, with the first right apex 28 close to the lower end 73 of the second right side 44 and the second right apex 48 close to the upper end 61 of the first right side 24, the first By joining the right hypotenuse 29 and the second right hypotenuse 49, the joint 10 (FIG. 3) of the right wall region 17 is formed. The first right region 21 and the second right region 41 form the right wall region 17 (FIG. 3). The margin portion 37 of the first right oblique side 29 and the margin portion 37 of the second right oblique side 49 are finally folded to be located on the outside of the bag 1.

Next, with the first left vertex 31 close to the upper end 72 of the second left side 45 and the second left vertex 51 close to the lower end 64 of the first left side 25, the first By joining the left hypotenuse 32 and the second left hypotenuse 52, the joint 10 (FIG. 2) of the left wall region 16 is formed. The first left region 22 and the second left region 42 form the left wall region 16 (FIG. 2). The margin portion 37 of the first left oblique side 32 and the margin portion 37 of the second left oblique side 52 are finally folded to be located on the outside of the bag 1.

Next, the first sheet-like member 11 is folded and joined so as to be convex outward over a first distance from the upper end 62 of the first left side 25 along the first left side 25. As a result, a left corner 18 is formed in the opening at the upper end of the main body 2, as shown in FIG. Next, the second sheet-like member 12 is folded and joined so as to be convex outward over a second distance from the upper end 71 of the second right side 44 along the first right side 24 . As a result, a right corner 19 is formed in the opening at the upper end of the main body 2, as shown in FIG.

Next, as shown in FIG. 1, one handle 3 is attached to the front wall region 14 near the opening at the upper end of the main body 2, and another handle 3 is attached to the rear wall region 15.

(summary)

According to the present embodiment, the joint portion 10 of the two sheet-like members (the first sheet-like member 11 and the second sheet-like member 12) is connected to the left wall region 16, the right wall region 17, and the lower wall region 13. Since the joints 10 are located diagonally across the joints 10, the joints 10 are difficult to come off even if a load is applied to the bent portions of the bag 1. That is, for example, the bent portion between the front wall region 14 and the right wall region 17, the bent portion between the right wall region 17 and the rear wall region 15, and the bent portion between the rear wall region 15 and the left wall region 16. Even if force is applied to the bent portion between the left wall region 16 and the front wall region 14, the bent portion between the lower wall region 13 and the front wall region 14, or the rear wall region 15, the joint portion 10 Since it is not present in the bent portion, the joint portion 10 is difficult to come off. Further, since the joint 10 is not parallel to the bent portion but diagonally inclined, even if an object is inserted parallel to the bent portion, the load is not easily concentrated on the bent portion and the joint is difficult to come off.

According to this embodiment, at the upper end of the main body 2, the sheet-like members (the first sheet-like member 11 and the second sheet-like member 12) are folded and joined in a convex manner toward the outside. Since corners (corners 18 and 19) are formed in the opening at the upper end of the main body 2, strong corners can be formed in the opening with a simple structure.

According to this embodiment, since the upper and lower parts of each joint 10 in the right wall region 17 and left wall region 16 are bent in opposite directions, compared to a case where the joint 10 is completely straight, It is easy to prevent the joining part 10 from being destroyed by flexibly absorbing the force from the front wall region 14 side and the force from the rear wall region 15 side.

According to the present embodiment, the joint 10 of the two sheet-like members (the first sheet-like member 11 and the second sheet-like member 12) is connected to the two side wall regions (the left wall region 16 and the right wall region 16) of the bag 1. Since they are arranged diagonally across the wall region 17) and the lower wall region 13, the joint 10 is unlikely to come off even if a load is applied to the bent portion of the bag 1. That is, since the joint portion 10 does not exist on the first right side 24, first left side 25, first lower side 27, second right side 44, second left side 45, and second lower side 47, which are the bent parts, Even if force is applied to these bent portions, the joint portion 10 will not easily come off.

According to this embodiment, the sheet-like members (the first sheet-like member 11 and the second sheet-like member 12) are oriented outward at the upper end 62 of the first left side 25 and the upper end 71 of the second right side 44. A corner is formed at the opening at the upper end of the main body 2 by convexly folding and joining, so that a strong corner can be formed at the opening with a simple structure.

The invention is not limited to the embodiments described above. That is, those skilled in the art may make various changes, combinations, subcombinations, and substitutions with respect to the components of the above-described embodiments within the technical scope of the present invention or its equivalent scope.
Note that the joint portion 10 may have a laterally symmetrical shape (a shape extending from the upper right to the lower left) shown in FIGS. 2 and 3.

The present invention is applicable to various bags.

1... Bag 2... Main body 3... Handle 10... Joint part 11... First sheet-like member 12... Second sheet-like member 13... Lower wall area 14... Front wall area 15... Back wall area 16... Left wall area 17 ... Right wall area 18... Corner 19... Corner 21... First right area 22... First left area 23... First lower area 24... First right side 25... First left side 26... First upper side 27 ... First lower side 28... First right vertex 29... First right hypotenuse 30... First right base 31... First left vertex 32... First left hypotenuse 33... First left base 34... th 1 lower vertex 35... 1st lower oblique side 36... 1st lower base side 37... Margin 41... 2nd right area 42... 2nd left area 43... 2nd lower area 44... 2nd right side 45 ... Second left side 46... Second top side 47... Second bottom side 48... Second right vertex 49... Second right hypotenuse 50... Second right base 51... Second left vertex 52... Second Left oblique side 53... Second left base side 54... Second lower apex 55... Second lower oblique side 56... Second lower base side 61... Upper end 62... Upper end 63... Lower end 64... Lower end 71... Upper end 72... Upper end 73... Lower end 74… Lower end

Claims

It is a bag,
The bag includes a main body for storing an object,
The main body is formed by joining two sheet-like members,
The main body includes a lower wall region, a front wall region, a rear wall region, a left wall region, and a right wall region,
The front wall region, the rear wall region, the left wall region, and the right wall region extend upward from the lower wall region,
The front wall region and the rear wall region are arranged to face each other,
The left wall region and the right wall region are arranged to face each other,
The front wall region, the right wall region, the rear wall region, and the left wall region are arranged in order in an annular shape,
The joint portions of the two sheet-like members are located so as to diagonally cross the left wall region, the right wall region, and the lower wall region, respectively.
bag.
A corner is formed in the opening at the upper end of the main body by folding and joining the sheet-like member so as to convex outward at the upper end of the main body.
The bag according to claim 1.
Since each of the right wall region and the left wall region is curved, the upper part of each joint in the right wall region and the left wall region is connected to either the front wall region or the rear wall region. The lower part of each joint in the right wall region and the left wall region is curved in a convex manner in a direction opposite to the upper part. Extending in a curved manner,
The bag according to claim 1 or claim 2.
A bag manufacturing method for manufacturing a bag using a first sheet-like member and a second sheet-like member as materials, the method comprising:
The first sheet-like member is
a rectangular front wall area;
a first right region of the triangle;
a first left region of the triangle;
a first lower area of the triangle;
including;
The front wall region is
The first right-hand side,
a first left side opposite to the first right side;
a first upper side extending from the upper end of the first right side to the upper end of the first left side;
a first lower side extending from the lower end of the first right side to the lower end of the first left side;
including;
The first right region extends continuously from the first right side,
The first right region is
the first right vertex,
a first right hypotenuse extending from the upper end of the first right side to the first right apex;
a first right bottom side extending from the lower end of the first right side to the first right apex;
including;
The width of the first right region gradually increases from the upper end of the first right side toward the lower end of the first right side,
The first left region extends continuously from the first left side,
The first left area is
the first left vertex,
a first left hypotenuse extending from the lower end of the first left side to the first left vertex;
a first left bottom side extending from the top end of the first left side to the first left vertex;
including;
The width of the first left region gradually increases from the lower end of the first left side toward the upper end of the first left side,
The first lower region extends continuously from the first lower side,
The first lower region is
a first lower vertex;
a first lower oblique side extending from the left end of the first lower side to the first lower apex;
a first lower base side extending from the right end of the first lower side to the first lower apex;
including;
The width of the first lower region gradually increases from the left end of the first lower side toward the right end of the first lower side,
A margin extends from each of the first right oblique side, the first right bottom side, the first left oblique side, the first lower oblique side, and the first lower base side,
The second sheet-like member is
a rectangular rear wall area;
a second right region of the triangle;
a second left region of the triangle;
a second lower area of the triangle;
including;
The rear wall region is
the second right-hand side;
a second left side opposite to the second right side;
a second upper side extending from the upper end of the second right side to the upper end of the second left side;
a second lower side extending from the lower end of the second right side to the lower end of the second left side;
including;
The second right region extends continuously from the second right side,
The second right area is
a second right vertex;
a second right hypotenuse extending from the lower end of the second right side to the second right apex;
a second right bottom side extending from the top end of the second right side to the second right apex;
including;
The width of the second right region gradually increases from the lower end of the second right side toward the upper end of the second right side,
The second left region extends continuously from the second left side,
The second left area is
a second left vertex,
a second left hypotenuse extending from the upper end of the second left side to the second left vertex;
a second left bottom side extending from the lower end of the second left side to the second left apex;
including;
The width of the second left region gradually increases from the upper end of the second left side toward the lower end of the second left side,
The second lower region extends continuously from the second lower side,
The second lower region is
a second lower vertex;
a second lower oblique side extending from the right end of the second lower side to the second lower apex;
a second lower base side extending from the left end of the second lower side to the second lower apex;
including;
The width of the second lower region gradually increases from the right end of the second lower side toward the left end of the second lower side,
A margin portion extends from each of the second right oblique side, the second left oblique side, the second left bottom side, the second lower oblique side, and the second lower base side,
The bag manufacturing method includes:
the first lower oblique side with the second lower apex close to the left end of the first lower side and with the first lower apex close to the right end of the second lower side; and a step of joining the second lower oblique side;
joining the first right base side and the first lower base side with the first right apex close to the first lower apex;
joining the second left base side and the second lower base side with the second left apex close to the second lower apex;
the first right hypotenuse with the first right vertex close to the lower end of the second right side, and with the second right vertex close to the upper end of the first right side; and a step of joining the second right hypotenuse;
the first left hypotenuse with the first left vertex close to the upper end of the second left side, and with the second left vertex close to the lower end of the first left side; and the second left hypotenuse;
including,
Bag manufacturing method.
joining the first sheet-like member in a folded state so as to convex outward over a first distance from the upper end of the first left side along the first left side;
joining the second sheet-like member in a folded state so as to convex outward over a second distance from the upper end of the second right side along the first right side;
including,
The bag manufacturing method according to claim 4.