JP7330492B2 - Bag manufacturing method - Google Patents

Description

The present invention relates to a bag manufacturing method.

2. Description of the Related Art Conventionally, there is known a bag manufacturing method in which a bag body is manufactured by sewing a plurality of constituent members (see, for example, Japanese Utility Model Laid-Open No. 5-58022). Japanese Utility Model Laid-Open No. 5-58022 discloses a method of manufacturing a bag in which the number of constituent members of the bag is reduced as much as possible and steps such as sewing are simplified. In the bag manufacturing method disclosed in Japanese Utility Model Laid-Open No. 5-58022 mentioned above, the first continuous sheet connecting the front plate portion and the bottom plate portion of the bag, and the back plate portion and the left and right gore portions are connected. The bag is produced by joining the second continuous sheet with fine wires for shape retention and shaping.

Japanese Utility Model Laid-Open No. 5-58022

In the bag manufacturing method disclosed in Japanese Utility Model Laid-Open No. 5-58022, the number of constituent members of the bag is reduced, and the sewing process is facilitated by interposing shape-retaining and shaping thin wires. It is However, in order to prepare a continuous sheet having the above-mentioned specific shape, fabric ends are generated when cutting fabric, so there is room for improvement from the viewpoint of effective use of bag materials such as fabric.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and to provide a bag manufacturing method that enables effective use of bag materials.

In the bag manufacturing method according to the present disclosure, a step of preparing a band-shaped body to be a bag is performed. The strip has a first end, a second end, a first major surface and a second major surface. The first end is one end in the extending direction of the strip. The second end is the end located opposite the first end. The first major surface connects between the first end and the second end. The second main surface is located on the opposite side of the first main surface. In the bag manufacturing method described above, the step of bending the belt-like body around the first bent portion is performed so that the second end overlaps the first main surface. Further, a step of bending the belt-shaped body around the second bent portion is performed so that the first end overlaps the second main surface between the second end and the first bent portion. A step of obtaining a laminate by bending the belt-like body around a third bent portion located between the first end and the first bent portion so that the first bent portion is adjacent to the first end is performed. do. In addition, a step of fixing the portions of the strips arranged in layers at both ends of the laminate in the direction intersecting with the extending direction of the strips is carried out. Further, the laminate is turned over from the first opening between the first end and the first bent portion so that the second end is exposed to the outside and the first main surface of the second bent portion is exposed to the outside. Carry out the process. Further, in the overturned laminate, the step of turning over the laminate again is performed from the second opening between the second end and the second bent portion.

According to the above, it is possible to realize a bag manufacturing method that can effectively utilize the material of the bag.

FIG. 4 is a schematic diagram for explaining the method of manufacturing the bag according to Embodiment 1; FIG. 4 is a schematic diagram for explaining the method of manufacturing the bag according to Embodiment 1; FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2(A); 3 is a schematic cross-sectional view taken along line IV-IV in FIG. 2(B); FIG. FIG. 3 is a schematic cross-sectional view taken along line segment VV in FIG. 2(C); 1 is a schematic diagram of a bag according to Embodiment 1. FIG. FIG. 10 is a schematic diagram for explaining a bag manufacturing method according to Embodiment 2; FIG. 10 is a schematic diagram for explaining a bag manufacturing method according to Embodiment 2; FIG. 8B is a schematic cross-sectional view along the line segment IX-IX in FIG. 8C; FIG. 10 is a schematic cross-sectional view for explaining a bag manufacturing method according to Embodiment 2; FIG. 10 is a schematic cross-sectional view for explaining a bag manufacturing method according to Embodiment 2; FIG. 10 is a schematic diagram for explaining a bag manufacturing method according to Embodiment 3; FIG. 10 is a schematic diagram for explaining a bag manufacturing method according to Embodiment 3; FIG. 13C is a schematic cross-sectional view taken along line XIV-XIV in FIG. 13C; It is a cross-sectional schematic diagram for demonstrating the manufacturing method of the bag which concerns on Embodiment 3. FIG. It is a cross-sectional schematic diagram for demonstrating the manufacturing method of the bag which concerns on Embodiment 3. FIG.

Embodiments of the present invention will be described below. In addition, the same reference numerals are given to the same configurations, and the description thereof will not be repeated.

(Embodiment 1)
<Bag manufacturing method>
1 and 2 are schematic diagrams for explaining the bag manufacturing method according to the first embodiment. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2(A). FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 2(B). FIG. 5 is a schematic cross-sectional view for explaining the bag manufacturing method according to the first embodiment. FIG. 6 is a schematic diagram of the bag according to Embodiment 1. FIG. A method for manufacturing a bag according to the present embodiment will be described with reference to FIGS. 1 to 6. FIG. 1(A) to (D) and 2(A) to (C) are schematic diagrams for explaining each step of the bag manufacturing method. The state of the body 1 is shown.

As shown in FIG. 1A, in the bag manufacturing method according to Embodiment 1, first, a step (S10) of preparing a belt-shaped body 1 to be a bag including a bag main body 100 (see FIG. 6) is performed. do. Any material such as leather, synthetic leather, cloth, resin, or the like can be used as the material of the band-shaped body 1 . The planar shape of strip 1 is, for example, a rectangle. Strip 1 has a first end 11 , a second end 12 , a first major surface 13 and a second major surface 14 . The first end 11 is one end in the extending direction of the belt-shaped body 1 . The second end 12 is the end located opposite to the first end 11 . The first major surface 13 connects the first end 11 and the second end 12 . The second main surface 14 is located on the side opposite to the first main surface 13 . The length of the first main surface 13 and the widths of the first end 11 and the second end 12 in the extending direction of the strip 1 may be determined based on the size of the bag body 100 to be manufactured.

Next, as shown in FIG. 1(B), the step (S20) of bending the band-shaped body 1 around the first bent portion 21 is performed. In this step ( S<b>20 ), belt-like body 1 is bent about first bent portion 21 so that second end 12 of belt-like body 1 overlaps first main surface 13 . In this specification, the direction in which the belt-shaped body 1 is bent is along the direction in which the belt-shaped body 1 extends, unless otherwise specified.

Next, as shown in FIG. 1(C), the step (S30) of bending the belt-like body 1 around the second bent portion 22 is performed. In this step ( S<b>30 ), strip 1 is bent so that first end 11 of strip 1 overlaps second main surface 14 between second end 12 and first bent portion 21 . At this time, the belt-shaped body 1 is bent around the second bent portion 22 . The distance between the first end 11 and the first bent portion 21 is determined according to the width of the bottom of the bag to be manufactured. The second bent portion 22 is arranged so as to sandwich the second end 12 of the belt-shaped body 1 .

Next, as shown in FIG. 1(D), the step (S40) of bending the strip 1 so that the first bent portion 21 is adjacent to the first end 11 is performed. Specifically, the strip 1 is bent around the third bent portion 23 located between the first end 11 and the first bent portion 21 to obtain the laminate 50 .

Next, as shown in FIG. 2(A), a step of fixing the portions of the strips 1 stacked and arranged at both ends 31 of the laminate 50 in the direction intersecting the extending direction of the strip 1 (S50 ). In this step (S50), any conventionally known method can be used to fix the belt-shaped body 1 at both ends 31. FIG. For example, the band-shaped body 1 may be fixed by sewing, or may be fixed by a fixing member such as an adhesive. In FIG. 2A, the position fixed by sewing or a fixing member as described above is indicated as a fixing portion 81 . By this step ( S<b>50 ), the portions of the laminated strips 1 are fixed to each other at the fixing portion 81 of the laminated body 50 . As a result, both ends 31 of the laminate 50 are closed, and the only opening connecting the inside and outside of the laminate 50 is the first opening 41 shown in FIGS. The first opening 41 is arranged so that the first end 11 and the first bent portion 21 face each other, and is formed by fixing the first end 11 and the first bent portion 21 at both ends 31. be done.

Next, as shown in FIGS. 2B and 4, a step (S60) of turning over the laminate 50 from the first opening 41 is performed. In this step (S60), the inner peripheral side of the region 51 shown in FIG. Laminate 50 is turned over so that 41 is exposed to the outside. As a result, as shown in FIG. 4, a partial region 22b of the first main surface 13 at the second bent portion 22 is exposed to the outer peripheral side, while a partial region 22a of the second main surface 14 at the second bent portion 22 is exposed. It is positioned on the inner peripheral side of the second bent portion 22 . A second opening 42 is formed by fixing the second bent portion 22 and the second end 12 at both ends 31 as shown in FIG. 2(A). In the state shown in FIGS. 2B and 4, the second opening 42 is exposed to the outside.

Next, in the overturned laminate 50, the step of turning over the laminate 50 again from the second opening 42 (see FIG. 2B) between the second end 12 and the second bent portion 22 (S70). to implement. By this step (S70), the partial regions 23a and 23b forming the third bent portion 23 are arranged so as to sandwich the first bent portion 21 on the opposite side of the second opening 42 as shown in FIG. state. A region including the partial regions 23 a and 23 b and the first bent portion 21 constitutes the bottom 44 of the bag main body 100 .

After that, a step of adjusting the shape of the bag, such as extending the area that will become the bottom 44 of the bag main body 100 into a flat shape, is carried out, whereby the bag main body 100 as shown in FIGS. 2C and 6 is obtained. Obtainable. After that, parts such as a handle are fixed to the bag main body 100, so that the bag according to the present embodiment can be obtained.

Here, as shown in FIG. 5, the obtained bag main body 100 has a cross section along the direction from the second opening 42, which is an opening facing the outside of the bag main body 100, toward the bottom. The second end 12 of the strip 1 forming part 100 forms part of the second opening 42 . The first end 11 faces the first bent portion 21 forming the bottom of the bag main body 100 inside the bag main body 100, and also faces both ends 31 of the band-shaped body 1 (see FIG. 2A). It is connected to the portion of the band-shaped body 1 that constitutes the outer peripheral surface of the bag main body 100 by the fixing portion 81 at . In addition, in order to carry out the step of turning over the laminate 50 in which the belt-like bodies 1 are laminated as described above, the portions outside the fixing portions 81 shown in FIG. In the bag main body 100 , it is located on the inner peripheral side of the bag main body 100 . Therefore, since the side surface of the bag main body 100 is not exposed outside the fixing portion 81, the design of the bag main body 100 can be improved.

<Effect>
To summarize the characteristic configuration of the bag manufacturing method according to the present embodiment, the bag manufacturing method includes a step of preparing the belt-shaped body 1 to be a bag. Strip 1 has a first end 11 , a second end 12 , a first major surface 13 and a second major surface 14 . The first end 11 is one end in the extending direction of the belt-shaped body 1 . The second end 12 is the end located opposite to the first end 11 . The first major surface 13 connects the first end 11 and the second end 12 . The second main surface 14 is located on the side opposite to the first main surface 13 . In the bag manufacturing method described above, the step of bending belt-shaped body 1 around first bent portion 21 is performed so that second end 12 overlaps first main surface 13 . Further, a step of bending strip 1 around second bent portion 22 is performed so that first end 11 overlaps second main surface 14 between second end 12 and first bent portion 21 . The belt-shaped body 1 is folded and laminated so that the first bent portion 21 is adjacent to the first end 11, centering on the third bent portion 23 located between the first end 11 and the first bent portion 21. A step of obtaining a body 50 is performed. In addition, at both end portions 31 of the laminate 50 in the direction intersecting with the extending direction of the strip 1, a step of fixing the parts of the strip 1 stacked and arranged is performed. Further, the first opening 41 between the first end 11 and the first bent portion 21 is formed such that the second end 12 is exposed to the outside and the first major surface 13 of the second bent portion 22 is exposed to the outside. , a step of turning over the laminate 50 is performed. Moreover, in the laminated body 50 that has been turned over, the step of turning over the laminated body 50 again is performed from the second opening 42 between the second end 12 and the second bent portion 22 .

In the bag manufacturing method described above, the belt-shaped body 1, which is one member, is folded to form the laminated body 50. After fixing both ends 31 of the laminated body 50, the laminated body 50 is divided into the first opening 41 and the second opening 41. 2 The bag main body 100 can be obtained by carrying out the step of turning over from the opening 42 . Therefore, the conventional process of cutting the fabric to prepare a plurality of constituent members is not necessary. Therefore, it is possible to prevent the occurrence of edge cloth or the like that accompanies the cutting of the cloth. As a result, the material of the bag can be effectively utilized.

Furthermore, after fixing the both ends 31 of the laminated body 50, the process of turning over the laminated body 50 is carried out. The manufacturing process can be simplified from the manufacturing method of Therefore, it is possible to suppress an increase in manufacturing cost of the bag.

(Embodiment 2)
<Bag manufacturing method>
7 and 8 are schematic diagrams for explaining the bag manufacturing method according to the second embodiment. FIG. 9 is a schematic cross-sectional view along line segment IX-IX in FIG. 8(C). 10 and 11 are schematic cross-sectional views for explaining the bag manufacturing method according to the second embodiment. The bag manufacturing method according to the second embodiment shown in FIGS. 7 to 11 basically has the same configuration as the bag manufacturing method shown in FIGS. 1 to 6, and can obtain the same effects. 1 to 6 in that the inside pocket 72 can be formed inside the main body of the bag. A specific description will be given below. 7(A) to (C) and FIGS. 8(A) to (C) are schematic diagrams for explaining each step of the method of manufacturing the bag. The state of a strip 1 is shown.

As shown in FIG. 7A, in the bag manufacturing method according to the second embodiment, the step (S110) of preparing the belt-shaped body 1 to be the bag main body 100 is performed. This step (S110) is the same as the step (S10) shown in FIG. The band-shaped body 1 prepared here has the same basic configuration as the band-shaped body 1 shown in FIG. 1(A). However, in order to form the inner pocket 72 (see FIG. 7B), the strip 1 has a length that is the distance between the first end 11 and the second end 12 of the strip shown in FIG. may be longer.

Next, as shown in FIG. 7B, a step (S120) of bending strip-shaped body 1 about first bent portion 21 so that first end 11 overlaps first main surface 13 is performed. In this step ( S<b>120 ), belt-shaped body 1 is bent so that the region from first end 11 to first bent portion 21 , which constitutes middle pocket 72 , overlaps first main surface 13 of belt-shaped body 1 . Further, a fixing portion 71 is formed in the portion to be the inner pocket 72 in order to fix it to the first main surface 13 of the band-shaped body 1 . The fixed portion 71 is a portion where the portion of the belt-shaped body 1 from the first end 11 to the first bent portion 21 is fixed to the first main surface 13 . Fixing portion 71 is, for example, a sewing portion. In addition, in the fixing portion 71, a portion that becomes the middle pocket 72 may be fixed to the first main surface 13 by a connecting member such as an adhesive.

Next, as shown in FIG. 7(C), a step (S130) of bending the belt-shaped body 1 around the second bent portion 22 is performed so that the second end 12 overlaps the first main surface 13. . In this step ( S<b>130 ), the second end 12 and the first end 11 are spaced apart from each other. This step (S130) corresponds to the step (S20) shown in FIG. 1(B).

Next, as shown in FIG. 8A, the third bent portion 23 is centered so that the first bent portion 21 overlaps the second main surface 14 between the second end 12 and the second bent portion 22 . Then, the step (S140) of bending the band-shaped body 1 is performed. This step (S140) corresponds to the step (S30) shown in FIG. 1(C). The distance between the first bent portion 21 and the second bent portion 22 is determined according to the width of the bottom of the bag to be manufactured. The third bent portion 23 is arranged so as to sandwich the second end 12 of the belt-shaped body 1 .

Next, as shown in FIG. 8(B), the step (S150) of bending the strip 1 so that the second bent portion 22 is adjacent to the first bent portion 21 is performed. This step (S150) corresponds to the step (S40) shown in FIG. 1(D). In this step ( S<b>150 ), belt-shaped body 1 is bent around fourth bent portion 24 , which is a portion located between first bent portion 21 and second bent portion 22 . As a result, the laminate 50 is obtained.

Next, as shown in FIGS. 8(C) and 9, at both end portions 31 of the laminate 50 in the direction intersecting the extending direction of the strip 1, the portions of the strip 1 arranged in layers are fixed. Step (S160) is performed. This step (S160) corresponds to the step (S50) shown in FIG. In this step (S160), the method of fixing the portions of strip 1 at both ends 31 may be, for example, a method of fixing fixing portions 81 located at both ends of strip 1 by sewing, or using an adhesive or the like. A method of fixing with a fixing member may also be used. Also, any other method may be used as the fixing method. As a result, both ends 31 of the laminate 50 are closed, and the only opening connecting the inside and outside of the laminate 50 is the first opening 41 shown in FIGS. 8(C) and 9 . The first opening 41 is arranged so that the first bent portion 21 and the second bent portion 22 face each other, and the first bent portion 21 and the second bent portion 22 are fixed at both end portions 31. Formed by

Next, the first opening between the first bent portion 21 and the second bent portion 22 is opened so that the second end 12 is exposed to the outside and the first main surface 13 of the third bent portion 23 is exposed to the outside. From the section 41, the step of turning over the laminate 50 (S170) is carried out. This step (S170) corresponds to the step (S60) shown in FIG. 2B and FIG. As a result, as shown in FIG. 10, a partial region 23b of the first main surface 13 at the third bent portion 23 is exposed to the outer peripheral side, while a partial region 23a of the second main surface 14 at the third bent portion 23 is exposed. It is positioned on the inner peripheral side of the third bent portion 23 . A second opening 42 is formed by fixing the third bent portion 23 and the second end 12 at both ends 31 as shown in FIG. 8(C). In the state shown in FIG. 10, the second opening 42 is exposed to the outside.

Next, in the laminated body 50 that has been turned over, the step of turning over the laminated body 50 again from the second opening 42 between the second end 12 and the third bent portion 23 (S180) is performed. This step (S180) corresponds to the step (S70) in the first embodiment. By this step (S180), as shown in FIG. state. A region including the partial regions 24a and 24b and the second bent portion 22 constitutes the bottom 44 (see FIG. 2(C)) of the bag main body 100. As shown in FIG.

After that, a step of adjusting the shape of the bag, such as extending the area that will become the bottom 44 of the bag main body 100 into a flat shape, is carried out, whereby the bag main body 100 as shown in FIGS. 2C and 6 is obtained. Obtainable. Inside the main body of the bag, a middle pocket 72 shown in FIG. 7(B) is arranged. After that, the bag according to the present embodiment can be obtained by performing a step of fixing parts such as a handle to the bag main body 100 .

Here, as shown in FIG. 11, the obtained bag main body 100 has a cross section along the direction from the second opening 42, which is an opening facing the outside of the bag main body 100, toward the bottom. The second end 12 of the strip 1 forming part 100 forms part of the second opening 42 . Also, the first end 11 forms part of the opening of the middle pocket 72 . Inside the bag main body 100, the first bent portion 21 of the band 1 faces the second bent portion 22 forming the bottom portion of the bag main body 100, and both end portions 31 of the band 1 (see FIG. 8(C)). )) is connected to the portion of the band-shaped body 1 forming the outer peripheral surface of the bag main body 100 by the fixing portion 81 in ). In addition, in order to carry out the step of turning over the laminate 50 in which the belt-shaped bodies 1 are laminated as described above, as in the case of the bag main body 100 according to the first embodiment, both ends 31 of the belt-shaped body are shown in FIG. 8(C). In the case of the bag main body 100 , the portion outside the fixed portion 81 shown is located on the inner peripheral side of the bag main body 100 .

<Effect>
To summarize the characteristic configuration of the bag manufacturing method according to the present embodiment, the bag manufacturing method includes a step of preparing the belt-shaped body 1 to be a bag. Strip 1 has a first end 11 , a second end 12 , a first major surface 13 and a second major surface 14 . The first end 11 is one end in the extending direction of the strip 1 . The second end 12 is the end located opposite to the first end 11 . The first major surface 13 connects the first end 11 and the second end 12 . The second main surface 14 is located on the side opposite to the first main surface 13 . In the bag manufacturing method, the step of bending strip-shaped body 1 around first bent portion 21 is performed so that first end 11 overlaps first main surface 13 . Further, a step of bending the belt-shaped body 1 around the second bent portion 22 is performed so that the second end 12 overlaps the first main surface 13 . A step of bending strip-like body 1 around third bent portion 23 is performed so that first bent portion 21 overlaps second main surface 14 between second end 12 and second bent portion 22 . The belt-like body 1 is bent around the fourth bent portion 24 located between the first bent portion 21 and the second bent portion 22 so that the second bent portion 22 is adjacent to the first bent portion 21. to obtain a laminate. At both end portions 31 of the laminate 50 in the direction intersecting the extending direction of the strip 1, a step of fixing the parts of the strip 1 arranged in layers is performed. From the first opening 41 between the first bent portion 21 and the second bent portion 22 so that the second end 12 is exposed to the outside and the first major surface 13 of the third bent portion 23 is exposed to the outside. , a step of turning over the laminate 50 is performed. In the overturned laminate 50 , the step of turning over the laminate 50 again is performed from the second opening 42 between the second end 12 and the third bent portion 23 .

In the bag manufacturing method according to the present embodiment described above, basically the same effects as those of the bag manufacturing method according to the first embodiment can be obtained. Furthermore, since the middle pocket 72 can be formed in advance as shown in FIG. 7(B), a bag having the middle pocket 72 can be easily obtained.

(Embodiment 3)
<Bag manufacturing method>
12 and 13 are schematic diagrams for explaining the bag manufacturing method according to the third embodiment. FIG. 14 is a schematic cross-sectional view taken along line XIV-XIV in FIG. 13(C). 15 and 16 are schematic cross-sectional views for explaining the bag manufacturing method according to the third embodiment. The bag manufacturing method according to the third embodiment shown in FIGS. 12 to 16 basically has the same configuration as the bag manufacturing method shown in FIGS. 1 to 6, and can obtain the same effects. 1 to 6, the middle pocket 72 can be formed inside the main body of the bag, and the bottom of the main body 100 of the bag is reinforced by arranging the band 1 in two layers. It is different from the bag manufacturing method shown in . A specific description will be given below. 12(A) to (C) and FIGS. 13(A) to (C) are schematic diagrams for explaining each step of the method of manufacturing the bag, respectively, and the material to be the main body of the bag. The state of a strip 1 is shown.

As shown in FIG. 12(A), in the bag manufacturing method according to the third embodiment, the step (S210) of preparing the belt-shaped body 1 to be the bag main body 100 is performed. This step (S210) is the same as the step (S10) shown in FIG. The band-shaped body 1 prepared here has the same basic configuration as the band-shaped body 1 shown in FIG. 7(A). However, the strip 1 may be longer in length, which is the distance between the first end 11 and the second end 12, than the strip shown in FIG. 7(A) in order to reinforce the bottom.

Next, as shown in FIG. 12(B), a step (S220) of bending belt-shaped body 1 around first bent portion 21 is performed so that first end 11 overlaps first main surface 13. Next, as shown in FIG. In this step ( S<b>120 ), belt-like body 1 is folded to form the part that constitutes middle pocket 72 . Further, a fixing portion 71 is formed in the portion to be the inner pocket 72 in order to fix it to the first main surface 13 of the band-shaped body 1 . This step is the same as the step (S120) shown in FIG. 7B.

Next, as shown in FIG. 12B, a step (S230) of bending strip-shaped body 1 about second bent portion 22 so that second end 12 overlaps first main surface 13 is performed. In this step (S230), the region from the second bent portion 22 to the second end 12, which is the portion that reinforces the bottom of the bag main body 100, is formed, that is, the region in which the belt-shaped bodies 1 are doubly laminated.

Next, the step of fixing the second end 12 to the strip 1 (S240) is performed. The second end 12 is fixed to the first major surface 13 by a fixing portion 75 . The fixing portion 75 may be, for example, a sewn portion. Moreover, the second end 12 may be fixed to the first main surface 13 by a fixing member such as an adhesive in the fixing portion 75 .

Next, as shown in FIG. 12(C), a step (S250) of bending the belt-shaped body 1 around the third bent portion 23 is performed so that the second bent portion 22 overlaps the first main surface 13. . In this step ( S<b>250 ), the second bent portion 22 is arranged with a gap from the first end 11 . This step (S250) corresponds to the step (S130) shown in FIG. 7(C).

Next, as shown in FIG. 13A, the fourth bent portion 24 is formed so that the first bent portion 21 overlaps the second main surface 14 between the second bent portion 22 and the third bent portion 23. A step (S260) of folding the strip 1 around the center is performed. This step (S260) corresponds to the step (S140) shown in FIG. The distance between the first bent portion 21 and the third bent portion 23 is determined according to the width of the bottom of the bag to be manufactured. The fourth bent portion 24 is arranged so as to sandwich the second bent portion 22 of the band-shaped body 1 .

Next, as shown in FIG. 13(B), the step (S270) of bending the belt-shaped body 1 so that the third bent portion 23 is adjacent to the first bent portion 21 is performed. This step (S270) corresponds to the step shown in FIG. In this step ( S<b>270 ), belt-shaped body 1 is bent around fifth bent portion 25 which is a portion located between first bent portion 21 and third bent portion 23 . As a result, the laminate 50 is obtained.

Next, as shown in FIGS. 13(C) and 14, a step of fixing the stacked strips 1 at both ends 31 in the direction intersecting the extending direction of the strips 1 (S280). to implement. This step (S280) corresponds to the step (S160) shown in FIG. 8(C). In this step (S280), any method can be used as a method for fixing the belt-shaped body 1 at both ends 31, but the method used in the above-described step (S160) may be used. As a result, both ends 31 of the laminate 50 are closed, and the only opening connecting the inside and outside of the laminate 50 is the first opening 41 shown in FIGS. The first opening 41 is arranged so that the first bent portion 21 and the third bent portion 23 face each other, and the first bent portion 21 and the third bent portion 23 are fixed at both ends 31. Formed by

Next, the first bent portion 21 and the third bent portion 23 are bent so that the second bent portion 22 is exposed to the outside and the first main surface 13 of the fourth bent portion 24 is exposed to the outside. From the opening 41, the step of turning over the laminate 50 (S290) is performed. This step (S290) corresponds to the step (S170) in the second embodiment. As a result, as shown in FIG. 15, a partial region 24b of the first principal surface 13 at the fourth bent portion 24 is exposed to the outer peripheral side, while a partial region 24a of the second principal surface 14 at the fourth bent portion 24 is exposed. It is positioned on the inner peripheral side of the fourth bent portion 24 . A second opening 42 is formed by fixing the fourth bent portion 24 and the second bent portion 22 at both ends 31 as shown in FIG. 13(C). In the state shown in FIG. 15, the second opening 42 is exposed to the outside.

Next, in the laminated body 50 that has been turned over, the step of turning over the laminated body 50 again from the second opening 42 between the second bent portion 22 and the fourth bent portion 24 (S300) is performed. This step (S300) corresponds to the step (S180) in the second embodiment. By this step (S300), as shown in FIG. They are arranged so as to sandwich the portion 23 . A region including the partial regions 25a, 25b, 25c, 25d and the third bent portion 23 constitutes the bottom 44 of the bag main body 100 (see FIG. 2(C)). As can be seen from FIG. 16, a portion of the band-shaped body 1 is doubled in the region that becomes the bottom 44 . As a result, the strength of the bottom of the bag body 100 can be improved.

After that, a step of adjusting the shape of the bag, such as extending the area that will become the bottom 44 of the bag main body 100 into a flat shape, is carried out, whereby the bag main body 100 as shown in FIGS. 2C and 6 is obtained. Obtainable. Inside the main body of the bag, a middle pocket 72 shown in FIG. 12(B) is arranged. Furthermore, as described above, at the bottom portion, part of the band-shaped body 1 is doubled to reinforce the bottom. After that, the bag according to the present embodiment can be obtained by carrying out a finishing process such as fixing parts such as a handle to the bag main body 100 .

Here, as shown in FIG. 16, the obtained bag main body 100 has a cross section along the direction from the second opening 42, which is an opening facing the outside of the bag main body 100, toward the bottom. The second end 12 of the strip 1 forming part 100 forms part of the second opening 42 . Also, the first end 11 forms part of the opening of the middle pocket 72 . Inside the bag main body 100, the first bent portion 21 of the band-shaped body 1 faces the third bent portion 23 forming the bottom of the bag main body 100, and the both end portions 31 (see FIG. 13C )) is connected to the portion of the band-shaped body 1 forming the outer peripheral surface of the bag main body 100 by the fixing portion 81 in ). Further, in order to carry out the step of turning over the laminate 50 in which the belt-shaped bodies 1 are laminated as described above, the both end portions 31 of the belt-shaped bodies are shown in FIG. In the case of the bag main body 100 , the portion outside the fixed portion 81 shown is located on the inner peripheral side of the bag main body 100 . Further, at the bottom of the bag main body 100, part of the belt-shaped body 1 is double-layered to reinforce the bottom. The second end 12 (see FIG. 15) of the belt-shaped body 1 is fixed to another part of the belt-shaped body 1 by a fixing portion 75 on the side surface of the bag main body 100 .

<Effect>
To summarize the characteristic configuration of the bag manufacturing method according to the present embodiment, the bag manufacturing method includes a step of preparing the belt-shaped body 1 to be a bag. Strip 1 has a first end 11 , a second end 12 , a first major surface 13 and a second major surface 14 . The first end 11 is one end in the extending direction of the strip 1 . The second end 12 is the end located opposite to the first end 11 . The first major surface 13 connects the first end 11 and the second end 12 . The second main surface 14 is located on the side opposite to the first main surface 13 . In the bag manufacturing method, the step of bending strip-shaped body 1 around first bent portion 21 is performed so that first end 11 overlaps first main surface 13 . A step of bending the belt-shaped body 1 around the second bent portion 22 is performed so that the second end 12 overlaps the first main surface 13 . A step of fixing the second end 12 to the strip 1 is performed. A step of bending the belt-shaped body 1 around the third bent portion 23 is performed so that the second bent portion 22 overlaps the first main surface 13 . A step of bending strip 1 around fourth bent portion 24 is performed so that first bent portion 21 overlaps second main surface 14 between second bent portion 22 and third bent portion 23 . The belt-like body 1 is bent around the fifth bent portion 25 located between the first bent portion 21 and the third bent portion 23 so that the third bent portion 23 is adjacent to the first bent portion 21. Then, the step of obtaining the laminate 50 is carried out. At both end portions 31 in the direction intersecting the extending direction of the strip 1, a step of fixing the portions of the strip 1 arranged in layers is carried out. A first opening 41 between the first bent portion 21 and the third bent portion 23 is formed so that the second bent portion 22 is exposed to the outside and the first main surface 13 of the fourth bent portion 24 is exposed to the outside. , a step of turning over the laminate 50 is performed. In the laminated body 50 that has been turned over, the step of turning over the laminated body 50 again is performed from the second opening 42 between the second bent portion 22 and the fourth bent portion 24 .

In the bag manufacturing method according to the present embodiment described above, basically the same effects as those of the bag manufacturing method according to the second embodiment can be obtained. Furthermore, since the belt-shaped body 1 is double-layered in the region that serves as the bottom of the bag main body 100, the strength of the bottom of the bag is improved, and a bag with excellent durability can be obtained. can.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. As long as there is no contradiction, at least two of the embodiments disclosed this time may be combined. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all changes within the scope and meaning equivalent to the scope of the claims.

1 strip, 11 first end, 12 second end, 13 first main surface, 14 second main surface, 21 first bent portion, 22 second bent portion, 22a, 22b, 23a, 23b, 24a, 24b, 25a, 25b, 25c, 25d partial region 23 third bent portion 24 fourth bent portion 25 fifth bent portion 31 both ends 41 first opening 42 second opening 44 bottom 50 lamination body, 51 area, 71, 75, 81 fixed part, 72 middle pocket, 100 bag body.

Claims (3)

A step of preparing a band-shaped body to be a bag,
The belt-like body has a first end that is one end in the extending direction of the belt-like body, a second end located on the opposite side of the first end, and a space between the first end and the second end. It has a connecting first main surface and a second main surface located on the opposite side of the first main surface, and
bending the strip around a first bent portion such that the second end overlaps the first main surface;
a step of bending the strip around the second bent portion such that the first end overlaps the second main surface between the second end and the first bent portion;
A laminated body formed by bending the strip around a third bent portion located between the first end and the first bent portion so that the first bent portion is adjacent to the first end a step of obtaining
a step of fixing portions of the strips arranged in layers at both end portions of the laminate in a direction intersecting the extending direction of the strip;
from the first opening between the first end and the first bent portion such that the second end is exposed to the outside and the first main surface of the second bent portion is exposed to the outside; turning the laminate over;
and flipping the laminated body again through a second opening between the second end and the second bend in the laminated body that has been turned inside out. A step of preparing a band-shaped body to be a bag,
The belt-like body has a first end that is one end in the extending direction of the belt-like body, a second end located on the opposite side of the first end, and a space between the first end and the second end. It has a connecting first main surface and a second main surface located on the opposite side of the first main surface, and
bending the strip around a first bent portion such that the first end overlaps the first main surface;
bending the strip around a second bent portion such that the second end overlaps the first main surface;
a step of bending the strip around a third bend such that the first bend overlaps the second main surface between the second end and the second bend;
bending the belt-shaped body around a fourth bent portion located between the first bent portion and the second bent portion so that the second bent portion is adjacent to the first bent portion; obtaining a laminate;
a step of fixing portions of the strips arranged in layers at both end portions of the laminate in a direction intersecting the extending direction of the strip;
From the first opening between the first bent portion and the second bent portion so that the second end is exposed to the outside and the first main surface of the third bent portion is exposed to the outside, turning the laminate over;
and flipping the laminated body again through a second opening between the second end and the third bend in the laminated body that has been turned over. A step of preparing a band-shaped body to be a bag,
The belt-like body has a first end that is one end in the extending direction of the belt-like body, a second end located on the opposite side of the first end, and a space between the first end and the second end. It has a connecting first main surface and a second main surface located on the opposite side of the first main surface, and
bending the strip around a first bent portion such that the first end overlaps the first main surface;
bending the strip around a second bent portion such that the second end overlaps the first main surface;
securing the second end to the strip;
a step of bending the belt-like body about a third bent portion such that the second bent portion overlaps the first main surface;
a step of bending the strip around a fourth bend so that the first bend overlaps the second main surface between the second bend and the third bend;
bending the belt-like body around a fifth bent portion located between the first bent portion and the third bent portion so that the third bent portion is adjacent to the first bent portion; obtaining a laminate;
a step of fixing portions of the strips arranged in layers at both end portions in a direction intersecting the extending direction of the strips;
From the first opening between the first bent portion and the third bent portion such that the second bent portion is exposed to the outside and the first main surface of the fourth bent portion is exposed to the outside. , turning the laminate over;
and a step of turning over the laminated body again from the second opening between the second bent portion and the fourth bent portion in the laminated body that has been turned over.

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