Self-supporting bag

Abstract

To provide a self-supporting bag which is a bag body capable of storing a storage article in a vertical state, standing on its own in a stored state, further maintaining a quality of the storage article.SOLUTION: A bag body which is formed by folding a single sheet to form a bottom part has both side part seal parts, has a front surface side folding piece part and a back surface side folding piece part, and has a front surface inclined seal part on a front surface and the front surface side folding piece part of the bag body, the front surface inclined seal part being an inclined seal part formed in a bag body bottom part direction, and has a back surface inclined seal part (7) on a back surface and the back surface side folding piece part of the bag body, the back surface inclined seal part being formed inclined toward the inside of the bag body and crossing toward the inside of the bag body, and further a bottom part of the inside of the bag body is formed by the front surface side folding piece part and the back surface side folding piece part surrounded by the front surface inclined seal part and the back surface inclined seal part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a self-standing bag that can be stored vertically, such as grapes, and has a cushioning property for the stored items.

Background Art

[0002] A bag body made of a resin sheet or film and having a gusseted bottom for standing up is formed by making an incision inward from the side to the bottom during bag making and sealing the bottom side portion in an inclined state. Therefore, the bottom of the bag body having a bottom side portion is usually formed in a substantially hexagonal shape or the like to form a bottom surface, and this portion can be used to stand up. For example, there is a bag body shown in Japanese Patent Application Laid-Open No. 6-312750 (Patent Document 1) as a bag body having such a gusseted bottom.

[0003] Furthermore, there are many prior examples having a gusseted bottom, such as Japanese Utility Model Registration No. 3028300 (Patent Document 2), Japanese Patent Application Laid-Open No. 2001-301771 (Patent Document 3), Japanese Patent Application Laid-Open No. 2005-087023 (Patent Document 4), and the like. Such a bag body can store the contents in a standing state. For example, it is possible to store grapes or the like in this bag body and display and sell them. However, in such a bag body, since the bottom of the bag body contacts the ground surface of the bag body, the contents come into contact with the floor, the mounting table, etc. at this portion. For example, when storing grapes or the like, the grapes themselves come into contact with the other surface, and the quality deteriorates due to the weight of the grapes.

[0004] On the other hand, there is also a bag for packaging bunch-shaped fruits shown in Japanese Patent Application Laid-Open No. 2022-104159 (Patent Document 5) invented by the inventor of the present application. By storing bunch-shaped fruits such as grapes in this bag body, it is possible to prevent the grapes from contacting the floor or the like on the placement surface of the bag. However, in this bag body, it is necessary to store the grapes in a lying-down state horizontally, insert the stalk of the grapes into the hole inside the bag, and integrate it with the bag body using a linear member made of shape memory resin.

[0005] Therefore, it can be used as a bag body that can package cluster fruits such as grapes while maintaining quality. However, even in this bag body, after inserting the stalk of the grapes into the hole of the bag body and twisting it, a linear member made of shape memory resin can be rolled up and placed inside the bag body, and it takes time and effort to store them inside the bag body. Furthermore, grapes usually grow hanging down from the branches of the tree in a vertical state, and the up-and-down direction of the cluster is fixed. Maintaining the quality of the grapes can be achieved by making the state closer to this growth state. Therefore, when storing grapes or the like in the bag body, it is more appropriate to store them in a state closer to this growth situation.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0007] As described above, in the case of cluster fruits such as grapes, they are usually displayed and sold at the store in a state of being placed in a hard resin container. However, if they are too bulky, they are individually placed in containers and then further enclosed in a resin bag for display and sale, which is often done. Doing so requires both a box and a bag and involves a great deal of labor, leading to high costs. Therefore, simpler packaging is desired for packaging and the like, and it is desired to make it more environmentally friendly by minimizing the amount of raw materials used and, for example, reducing these members as much as possible.

[0008] Therefore, it is conceivable to sell them enclosed in a resin bag, but there is a drawback that, for example, the grapes at the bottom deteriorate due to the weight of the grapes. Therefore, in order to solve such a problem, there is an invention shown in Patent Document 5. However, in this invention, when enclosing grapes in a bag, it is necessary to roll up and enclose the bag body around the handle portion. Furthermore, it inevitably lies horizontally, and in order to minimize the deterioration of the quality of the grapes as much as possible, it is necessary to approach the state of growing on a tree. Therefore, it is desired to provide a bag body that can reduce the deterioration of grapes due to the weight of the grapes and reduce the quality deterioration of grapes to a state closer to the growing state.

Means for Solving the Problem

[0009] For this purpose, the invention according to claim 1 is a bag having a bottom formed by folding a single sheet and consisting of a front and back surface and a fold, wherein both side portions of the bag are formed by a seal portion, and the fold at the bottom of the bag has a folded piece portion on the front surface side and a folded piece portion on the back surface side and has a folded-back portion therebetween. The surface in contact with the surface of the bag and the surface of the folded piece portion on the front surface side has a surface inclined seal portion, and the surface inclined seal portion is a seal portion formed to be inclined in the direction of the inside of the bag from the seal portions on both side portions of the respective bags. It is an inclined seal portion formed in the direction of the bottom of the bag from the seal portions on both side portions of the respective bags at an arbitrary position in the direction of the bottom from the position of the folded-back portion inside the bag. The surface inclined seal portion is formed up to the bottom of the bag at a position closer to the respective side edges of the bag than the position that is the formation base point of the surface inclined seal portion formed from the seal portions on both side portions of the respective bags, rather than the central portion of the bottom of the bag. The surface in contact with the back surface of the bag and the surface of the folded piece portion on the back surface side has a back surface inclined seal portion, and this back surface inclined seal portion is a seal portion formed to be inclined in the direction of the inside of the bag from the seal portions on both side portions of the respective bags. It is a back surface inclined seal portion formed by intersecting inside the bag in the direction of the bottom from the position that is the formation base point of the back surface inclined seal portion formed from the seal portions on both side portions of the bag. Furthermore, it is a stand-up bag in which the bottom inside the bag is formed by the front surface side folded piece portion and the back surface side folded piece portion surrounded by the surface inclined seal portion and the back surface inclined seal portion. The above problem can be solved by the present invention.

[0010] Also, in this case, like the invention according to claim 2, it is a stand-up bag in which one or more of the seal portions on both side portions of the bag, the surface inclined seal portion, and the back surface inclined seal portion are seal portions having a certain width, and such an invention is also possible. Alternatively, like the invention according to claim 3, it is a stand-up bag in which a single sheet is formed of a single-layer or multi-layer resin sheet, and such an invention is also possible. In addition, a stand-up bag in which a single sheet is formed of a multi-layer sheet like the invention according to claim 4 may also be used.

[0011] Also, a stand-up bag made of a resin sheet with a thickness of 60 to 150 microns for a single sheet of sheet material may be used as in the invention according to claim 5. Furthermore, a stand-up bag having a hole at the bottom inside the bag body formed by the front-side folding piece and the back-side folding piece may be used as in the invention according to claim 6. In addition, a stand-up bag having a handle hole near the upper opening of the bag body may be used as in the invention according to claim 7. Furthermore, a stand-up bag in which a shape-memory linear resin material is disposed on the front-side inclined seal portion and the back-side inclined seal portion may be used as in the invention according to claim 8.

Advantages of the Invention

[0012] First, the invention according to claim 1 enables the provision of a bag body that can be stored in a vertical state when storing, for example, grapes. For example, it can be stored in a state close to the growth status of the stored item, and quality retention and the like can be enhanced. Furthermore, the bottom inside the bag body is formed by the front-side folding piece and the back-side folding piece supported by the front-side inclined seal portion and the back-side inclined seal portion. Since the stored item is stored at the position during storage, the contents are stored in a so-called hammock shape, so that pain and the like caused by the weight of the stored item can be greatly reduced.

[0013] For example, when storing grapes or the like, threshing, withering of the stalk, and deterioration of quality due to its own weight at the bottom can be prevented. Furthermore, since the bag can be formed from a single sheet of sheet material, the amount of resin used can be reduced, and the environmental impact can be reduced. In particular, the use of a hard container or the like can be eliminated, and the amount of raw materials used can be reduced. Next, according to claim 2, the seal portion can be made strong, the strength of the bag body itself can be increased, and the self-standing property can be enhanced. Even when storing heavy items such as grapes in the bag, it can stably stand on its own in the stored state.

[0014] Furthermore, according to the invention described in claims 3 to 4, a variety of sheet materials can be used, and sheet materials with enhanced functions required for each can be used. Also, according to the invention described in claim 5, a sheet material having strength can be used. Next, by using the invention described in claim 6, a hole can be provided at the bottom inside the bag formed by the folding piece on the front side and the folding piece on the back side, so that unnecessary moisture and the like inside the bag can be discharged to the outside, and necessary air circulation and humidity maintenance can be achieved. Furthermore, it is also possible to wash the stored items by pouring water or the like in the stored state.

[0015] Next, according to the invention described in claim 7, it will have a handle part, which facilitates carrying during transportation. Also, like the invention described in claim 8, by disposing a shape memory linear resin material in the front surface inclined seal part and the back surface inclined seal part, it is possible to provide a self-standing bag that enables more stable self-standing without deformation and with a stronger framework.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0017] FIG. 1 is a view showing an example of a stand-up pouch according to the present invention. The bag body (1) according to the present invention is formed by folding a single sheet of fabric, and is a bag body formed from the front and back surfaces, and is a bag body in which both side edges are formed by the seal portion (3), and has an opening portion (2) at the upper part. Therefore, the stand-up pouch according to the present invention is composed of a sheet of fabric consisting of the front and back surfaces, and the sheet is folded at the bottom to form a fold, and the folded-back portion (5) inside the bag body of the folded portion becomes the bottom of the bag body.

[0018] Since the bottom (4) is formed by folding, it has a front surface side folded piece portion (10) and a back surface side folded piece portion (11), and further has a folded-back portion (5) therebetween.

[0019] Therefore, this portion becomes the central portion of the bottom inside the bag body. From this, first, it is a bag body having a bottom (4) composed of a single sheet folded to form the front and back surfaces and the fold, and both side portions of the bag body are formed by the seal (3). In this case, this seal is formed by welding, fusing, adhesion, or the like, and forms the seal portion (3) to form both side portions of the bag body. For example, those having a certain width and strength may be used. In this case, it has a front surface (1a), a front surface side folded piece portion (10), a back surface (1b), and a back surface side folded piece portion (11).

[0020] Furthermore, the front surface (1a) is in contact with the surface of the front surface side folded piece portion (10), and this contact portion has a front surface inclined seal portion (6). Similarly, the back surface (1b) is in contact with the surface of the back surface side folded piece portion (11), and this contact portion has a back surface inclined seal portion (7). This front surface inclined seal portion (6) is a seal formed to be inclined in the direction of the inside of the bag body from the seal portion (3) on the side portion of the bag body, and is formed by an inclined seal portion (6) formed in the direction of the bottom of the bag body from the seal portion (3) on both side portions of the bag body at an arbitrary position in the bottom direction from the position of the folded-back portion (5) inside the bag body.

[0021] The surface inclined seal portion (6) is a seal portion (6) formed from both side portions of the bag body (1) toward the bottom of the bag body, and is formed up to the bottom (4) of the bag body (1) at a position closer to the side portion of the bag body having the base point (P) than the central portion of the bottom (4) of the bag body, which is the formation base point (P) of the surface side inclined seal portion (6) formed from the seal portions (3) on both sides of the bag body. Therefore, the central portion at the bottom of this front sheet fabric has a gap between the seal portions formed by the respective surface inclined seal portions (6). In this way, the tip portions of the surface inclined seal portions (6) formed from both sides do not contact each other with a gap at the bottom portion of the surface on the front side of the bag body.

[0022] By configuring in this way, for the tip portion during vertical storage of the stored item stored in the bag body, the seal portion does not form an internal space, and the tip of the stored item is positioned at the bottom fold. As a result, the load based on its own weight on this tip portion is dispersed by the tip portion having a gap, and the load applied to the stored item can be reduced. For example, when storing grapes, the load due to the weight of the grapes regarding the grains in the tip direction of the grapes can be reduced, threshing can be achieved, and moreover, the quality deterioration of the grains of the stored grapes in the tip direction can be prevented.

[0023] Next, regarding the back surface (1b) of the bag body, the back surface (1b) and the surface of the back surface side folded piece portion (11) are in contact, and this contact portion has a back surface inclined seal portion (7). This back surface inclined seal portion (7) is a seal portion formed by inclining from the seal portion (3) on each side of the bag body toward the inside of the bag body, and is formed by the inclined seal portions (7) formed from the seal portions (3) on both sides of the bag body toward the inside of the bag body in the direction of the bottom of the bag body from an arbitrary position in the bottom direction rather than the position of the folded portion (5) inside the bag body.

[0024] The rear surface inclined seal part (7) is a seal part formed from both side parts of each bag body (1) toward the inside of the bag body, and is a rear surface inclined seal part (7) formed by crossing inside the bag body in the bottom direction from the position which is the formation base point (P) of the rear surface side inclined seal part (7) formed from the seal parts (3) of both side parts of each bag body. Therefore, the bottom of this back sheet material has the bottom (4) of the bag body at the bottom rather than the rear surface side inclined seal part (7) of the bag body. In addition, the front surface inclined seal part (6) and the rear surface inclined seal part (7) are seal parts formed by welding, fusing, adhesion, etc., and a seal part having a certain width may be used.

[0025] Figure 2 is a view showing a state in which the bag body shown in Figure 1 has a space inside. For example, it is a view showing the state of the bag body with the contents inside the bag body. Therefore, it is a view showing that the storage is put inside the bag body and the bag body becomes a self-standing state, and is a view showing the bag body standing in an upright state.

[0026] The upper part of the bottom (4) of the bag body formed by the front surface side folded piece part (10) and the rear surface side folded piece part (11) surrounded by the front surface inclined seal part (6) and the rear surface inclined seal part (7) forms the inner bottom of the bag body, and storage can be placed on the upper part of this part. In this case, the front surface inclined seal part (6), the rear surface inclined seal part (7), and the seal parts (3) on both side parts of the bag body form a skeleton for supporting the storage of the bag body.

[0027] Therefore, the storage of the bag body can be stably stored by these seal parts. Particularly, for a storage having a weight, first, the opposing side part seal parts (6) support the bottom at the left and right points, and further, the bottom (4) can be supported around the bottom of the central part of each of the front surface inclined seal part (6) and the rear surface inclined seal part (7) of the bag body by the inclined seal part, and it can be supported at the bottom (4) at positions with a substantially equal interval with a so-called front-back, left-right four-point interval, and it becomes possible to provide a standing bag with a good sitting posture. For example, since the surface inclined seal portion (6) is formed up to the bottom of the bag body near the side portion direction of the bag body, this position serves as a so-called front-side fulcrum, and the bottom periphery, which is the lower part of the intersection formed from both side portions of the rear surface inclined seal portion (7), serves as a fulcrum on the back surface, i.e., in the rear direction, and the bag body can be made to stand upright at the bottom of the bag body.

[0028] In addition, a bag body made of a resin sheet that is generally frequently used for bag bodies may also be used, and various commonly used resin sheets or films such as polypropylene, polypropylene, polyethylene, polyester, polyethylene terephthalate, etc. may be used, for example, a sheet or film having a certain thickness may be used. For example, in addition to being around 90 microns, for example, between 40 microns and 50 microns, or about 60 microns, a sheet or film having an arbitrary thickness between about 60 microns and 150 microns may be used. Furthermore, even a thinner film or sheet fabric may be used, or a sheet fabric having a thickness of 150 microns or more may be used.

[0029] Furthermore, it is not limited to a single layer, and a multi-layer or multiple-layer sheet or film may be used. For example, a sheet fabric formed by laminating films of about 40 microns and about 25 microns in multiple layers may be used. Therefore, a bag body made of a sheet fabric formed by laminating a plurality or multiple layers of sheets and films having various thicknesses may also be used. In addition, although it is explicitly stated as a sheet fabric in the present invention, this is a general term for those using a single-layer to multi-layer or multiple-layer sheet or film, and any bag body using a sheet fabric may be used.

[0030] Figure 3 is a view showing an example of the bag body shown in Figure 2 as viewed from the side. The surface inclined seal portion (6) is formed from the side seal portion (3) and is formed up to the bottom (4) of the bag body (1) in front of the bag body, and is formed to be inclined in the front direction, which is the surface (1a) of the bag body (1). Furthermore, the rear inclined seal portion (7) is formed to be inclined from the side seal portion (3) to the intersection position. Therefore, the inner bottom of the bag body is formed by the back side folding piece portions (10) and (11) and the folding back portion (5) supported by the front surface inclined seal portion (6) and the back surface inclined seal portion (7) of the bag body (1).

[0031] The bottom inside this bag body reaches the bottom (4) in the direction of the front sheet material (1a), and on the back side (1b), it is supported at a position a certain distance above the bottom (4) of the bag body. Since the bottom inside this bag body has an inclined storage portion, it can be stored inside the bag body in a state of being erected in the so-called vertical direction. In this case, if grapes or the like are stored, the tip portion of the grape fruit can be positioned downward, and the handle portion of the grape axis can be positioned upward, allowing storage in a vertical state.

[0032] As a result, the grapes can be stored in a situation close to the situation where they are growing on the grapevine, and can be stored with the grapes placed on the inner bottom of the bag body formed by the front side folding piece portions (10) and (11) and the folding back portion (5), and will be placed in a so-called cushion state. Therefore, it can be stored in a state close to the state of placing grapes on a so-called hammock. In this case, by forming holes in the front side folding piece portion (10) and the back side folding piece portion (11), the moisture inside the bag body can leak out of the bag body through these holes. Therefore, unnecessary moisture can be discharged.

[0033] For example, it is also possible to take in necessary outside air, discharge unnecessary moisture, and allow the inflow of necessary moisture, etc. Therefore, it is possible to change from a sealed state and maintain a certain humidity inside the bag body, etc. From the above, holes may be formed in the front side folding piece portion (10) and the back side folding piece portion (11). Still, this hole means a through-hole, and it may be provided in both the front-side folding piece portion (10) and the back-side folding piece portion (11), or in either one of them, or at any arbitrary position, etc.

[0034] For example, it may be provided only in the vicinity of the bottom portion (4) of the bag body of the front-side folding piece portion (10). By doing so, it becomes possible to easily spill the moisture inside the bag body to the outside. Furthermore, even when cleaning with water or the like in a state where the stored items are stored, water will be discharged from the hole, and it will be possible to perform washing with water or the like. In particular, after purchase, it can be washed with water, etc., and it becomes convenient for cooking at home. Still, although not explicitly shown together with the above-mentioned hole in the drawings, it may have a handle hole in the vicinity of the opening at the upper part of the bag body. This makes it convenient to carry the bag body.

[0035] Figure 4 is an example of a perspective view of the stand-up bag shown in Figures 2 and 3. It has opposing side seal portions (3) that form the bag body (1), and these side seal portions (3) form the skeleton in the left-right direction of the bag body (1), and support the stand-up bag at its bottom (4). Furthermore, the front surface inclined seal portion (6) and the back surface inclined seal portion (7) of the bag body spread in the front-back direction of the bag body, that is, in the front and back directions, and there are two points with a gap between the front side and the back side, and support the bag body at the bottom (4).

[0036] Therefore, it is supported at four bottom portions (4) with a certain interval in the front, back, left, and right directions. As a result, it becomes possible to provide a bag body with enhanced self-standing property. In particular, when storing something with a large weight such as grapes in the bag body, the grapes can be stored in the bag body in a substantially vertical state, and the stored bag can be provided with self-standing property. Therefore, it is possible to display and sell the grapes in a stored state, and since they can be stored in a state close to the growing state, the preservation property of the grapes can be enhanced.

[0037] In particular, it can support the bottom around the storage position of the stored items, which are the central parts respectively, so that it can support at the bottom at positions that are almost equally spaced with a gap of four points, namely, front, back, left, and right, and it becomes possible to provide a standing bag that is comfortable to sit on. For example, since the surface inclined seal part (6) is formed up to the bottom (4) of the bag body at a position close to the side part direction (3) of the bag body, this position becomes a so-called front-side fulcrum, and the bottom periphery, which is the lower part of the intersection formed from both side parts (3) of the back inclined seal part (7), becomes a fulcrum on the back surface, that is, in the rear direction, and it can be made to stand upright at the bottom of the bag body.

[0038] FIG. 5 is a view showing an example of a state in which grapes are stored in the bag body shown in FIG. 2. As shown in this figure, the grapes are stored at the upper part of the bottom of the bag body formed by the front-side folded piece part (10) and the back-side folded piece part (11) surrounded by the surface inclined seal part (6) and the back inclined seal part (7) of the bag body, and this figure shows an example of such a state. As shown in this figure, the grapes are placed on the bottom inside the bag body, and the members are stored in a so-called hammock shape at a position separated from the floor part by this part.

[0039] Therefore, it is held in a state with a cushion against the weight of the grapes, and it can prevent the grapes from being accidentally damaged. Furthermore, it is placed vertically, and it is close to the growing state of the grapes, with the handle part of the axis of the grapes on top and the tip part of the grape grains at the bottom, and it can suppress threshing and axis withering. In addition, if it is configured to have a handle part near the opening of the bag body, it is possible to facilitate the carrying of this self-standing bag storing grapes.

[0040] Also, a linear resin material for shape memory may be disposed in the surface inclined seal part (6) and the back inclined seal part (7). This can increase the strength of the front surface inclined seal portion (6) and the back surface inclined seal portion (7), enhance the strength of the framework of the bag body (1), facilitate making the shape of the bag body into a desired shape when storing grapes, and improve the self-standing property of the bag body.

[0041] FIG. 6 is a view showing an example of a state in which grapes are stored in the bag body shown in FIG. 3. As shown in this figure, the grapes are shown in an example of a state where the grapes are stored vertically at the upper part of the bottom inside the bag body formed by the front surface side folded piece portion (10) and the back surface side folded piece portion (11) surrounded by the front surface inclined seal portion (6) and the back surface inclined seal portion (7) of the bag body. As shown in this figure, the grapes can be stored in a state close to the state during growth, the handle portion of the axis of the grapes can be stored upward and the tip portion of the grape grains can be stored downward, and threshing and axis withering can be suppressed.

[0042] Furthermore, since it can be stored in a cushioned state, the grape grains can be preserved without being damaged. Furthermore, FIG. 7 is a view showing an example of a state in which grapes are stored in the bag body shown in FIG. 4. As shown in this figure, the grapes are shown in an example of a state where the grapes are stored vertically at the upper part of the bottom of the bag body formed by the front surface side folded piece portion (10) and the back surface side folded piece portion (11) surrounded by the front surface inclined seal portion (6) and the back surface inclined seal portion (7) of the bag body.

Explanation of Reference Numerals

[0043] 1 Bag body 1a Front surface 1b Back surface 2 Opening 3 Side seal portion 4 Bottom 5 Folded-back portion 6 Front surface inclined seal portion 7 Back surface inclined seal portion 10 Front surface side folded piece portion 11 Back surface side folded piece portion P Base point

Claims

1. A bag body having a front and back surface and a bottom portion formed by folding a single sheet, The two sides of the bag are formed by a seal portion, The bottom of the bag is folded over with a front fold-in piece (10) and a back fold-in piece (11) with a fold-back part (5) between them. A surface inclined seal portion (6) is provided on the surface where the surface (1a) of the bag body contacts the surface of the surface-side fold-in piece (10), The surface inclined seal portions (6) are seal portions formed at an incline toward the inside of the bag from the seal portions (3) on both sides of the bag, and are inclined seal portions formed toward the bottom of the bag from the seal portions (3) on both sides of the bag at any position inside the bag toward the bottom from the folded-back position, the surface inclined seal portion (6) is formed up to the bottom of the bag body at a position closer to each side edge direction of the bag body than the position of the formation base point (P) of the surface side inclined seal portion (6) formed from the seal portions (3) on both sides of the bag body, rather than the center of the bottom of the bag body; A back inclined seal portion (7) is provided on the surface where the back surface (1b) of the bag body contacts the surface of the back fold-in piece (11), The back inclined seal portion (7) is a seal portion formed at an incline toward the inside of the bag from the seal portions (3) on both sides of each bag, The inclined back seal portion (7) is formed by intersecting with the base point (P) of the inclined back seal portion (7) formed from the seal portions (3) on both sides of the bag body inside the bag body toward the bottom side, The self-supporting bag is further characterized in that the bottom of the inside of the bag is formed by the front side fold-in piece (10) and the back side fold-in piece (11) surrounded by the front side inclined seal part (6) and the back side inclined seal part (7).

2. 2. The self-supporting bag according to claim 1, wherein at least one of the seal portions (3) on both sides of the bag body, the inclined front seal portion (6) and the inclined back seal portion (7) is a seal portion having a constant width.

3. 2. The self-supporting bag according to claim 1, wherein the sheet material is formed from a single-layer or multi-layer resin sheet.

4. 2. The self-supporting bag according to claim 1, wherein one sheet of fabric is formed from multiple layers of sheets.

5. 2. The self-supporting bag according to claim 1, wherein the sheet material is a resin sheet having a thickness of 60 microns to 150 microns.

6. 2. The self-supporting bag according to claim 1, wherein the bag body formed by the front fold-in piece (10) and the back fold-in piece (11) has a hole at the bottom thereof.

7. 2. The self-supporting bag according to claim 1, further comprising a handle hole disposed adjacent to an upper opening of the bag body.

8. 2. The self-supporting bag according to claim 1, wherein a shape-memory linear resin material is disposed in the front inclined seal portion (6) and the back inclined seal portion (7).

Images