Self-standing bag

Abstract

To provide a self-standing bag capable of storing a stored article in a state where drips coming out of the stored article is separated from the stored object when storing perishable goods such as fruits in the bag, and to provide the self-standing bag capable of being stacked without being crushed.SOLUTION: A self-standing bag has a gusset on the upper and lower portions, and is narrowed down at a central portion which is a barrel portion of the bag. The bottom portion has a diameter width smaller than that of an opening so as to be gradually smaller in the bottom direction. Therefore, the diameter of the bag becomes a slightly smaller diameter than that of the opening at the bottom portion via a narrowed-down portion. The bag is composed of a vicinity of the opening, the barrel portion, and the bottom portion, and has the side edge sealing part, a narrow-down area sealing part, and the bottom side edge sealing part. The narrow-down area sealing part extends from the side edge portion toward the inside of the bag along the inclination. The central portion forms the sealing part and a folded portion of the lower gusset on a surface sheet side of the bag has a nonwoven fabric.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a self-standing bag which is a bag body composed of a square bottom body, and can isolate and store the drip from the stored items from the stored items, and can also place a plurality of self-standing bags in the vertical direction.

Background Art

[0002] There are various bag bodies made of resin sheets or films and having a square bottom for standing up, and bag bodies that can be self-standing by forming a gusset part at the bottom of the bag body. Particularly, it is a bag body in which the bottom surface expands and can stand up by the inside of the bag body swelling when storing items in the bag body. For example, there is a bag body shown in JP-A-2022-11710 (Patent Document 1). When storing fresh products such as fruits as stored items in such a bag body and displaying and selling them, the drip of the fruits always comes out into the bag body, and the drip accumulates at the bottom together with the fruits which are the stored items.

[0003] For example, the bag body shown in JP-A-2019-182513 (Patent Document 2) as the bag body having this square bottom body always accumulates drip in the bag body when storing cut watermelon etc. inside, for example. In this case, since the bag body has a gusset part at the bottom, the bottom of the bag body expands, and since the internal space can be made wide, more contents can be stored. However, the upper part of the bag body is in a state where the opening is sealed, and the upper part does not expand and forms a linear ridge upper part.

[0004] Therefore, in order to store a larger amount of stored items, it is necessary to form a gusset part not only at the bottom but also at the upper part like the bag body shown in JP-A-2021-138409 (Patent Document 3) to increase the storage capacity of the bag body. Furthermore, the bag bodies storing the contents such as these fresh products to be sold will be displayed and sold at the storefront.

Prior Art Documents

Patent Document

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] As described above, when storing fresh products or the like in a bag body, drips of fresh products would accumulate at the bottom, which might reduce the freshness of the fresh products during display and sales. For example, in addition to visual freshness, it was necessary to separate the drips from the product as much as possible to prevent the growth of bacteria and the like. Furthermore, in a bag body where the stored items can be visually recognized, the visual freshness would inevitably be impaired during display and sales. In addition, when a purchaser buys fresh products with drips and carries them, drip leakage might occur during transportation, and some solutions were required.

[0007] Therefore, it was necessary to separate such drips from the stored products, and some solutions were required. Furthermore, when storing and selling in a hard, three-dimensional resin container, for example, when the container is square-shaped, it can be displayed and sold by stacking it on top of another container. However, in the case of storage using a resin bag body, if stacked on top, the lower bag body would be crushed, causing quality deterioration and a poor appearance during display and sales. Therefore, it was necessary to display and sell it in a state where it is arranged side by side and laid flat on the display stand without overlapping.

[0008] Therefore, in the case of a resin bag body, it is inevitably necessary to place it on a flat surface because it will be crushed if stacked. Furthermore, for example, even during storage during transportation, since the lower bag body would be crushed by the weight of the upper products when stacked, it was necessary to avoid stacking, and there was also a drawback that the amount that could be stored during one transportation was inevitably reduced.

[0009] As described above, it was first necessary to separate the drip of the bag body storage item from the storage item, and a solution to solve this problem was sought. Therefore, regarding the bag body for storing fresh products, etc., it was required to solve the problem that stacking would damage the stored items due to its softness.

Means for Solving the Problem

[0010] For this purpose, the invention according to claim 1 is a self-standing bag composed of a front sheet, a back sheet, and a front sheet portion for closing the chuck portion. It is a bag body that constricts at the central portion which is the body portion of the bag body and has a width smaller than the opening in the bottom direction. It is a bag body that gradually reduces in diameter at the bottom through the constriction portion from the width of the bag body opening. It is a bag body composed of the vicinity of the opening, the body portion, and the bottom. The side edge portion near the opening of the bag body has a side edge seal portion, the side edge portion of the constriction portion also has a constriction seal portion, and the side edge portion of the bottom of the bag body also has a bottom side edge portion seal portion. There is an upper gusset portion composed of an inverted Z-shaped sheet between the front sheet and the front sheet portion for closing the chuck portion, and there is a lower gusset portion of the bag body at the bottom of the bag body. It is a self-standing bag having a chuck portion between the back sheet and the front sheet portion for closing the chuck portion, and the opening of the bag body can be opened and closed by opening and closing the chuck portion. The constriction seal portion of the side edge portion of the constriction portion also extends from the side portion along the constriction slope directly into the bag body interior direction and forms a seal portion also inside the bag body, but it is formed up to the vicinity of the central portion of the bag body, and the central portion has a constriction seal portion without forming a seal portion. It is a self-standing bag having a non-woven fabric in the folded portion of the lower gusset portion (15) on the front sheet side. The above-mentioned problem can be solved by the present invention.

[0011] Furthermore, the invention according to claim 2 is a self-standing bag in which the non-woven fabric is a polyolefin fiber cross-laminated non-woven fabric, and such an invention may also be applicable. Furthermore, the invention according to claim 3 is a self-standing bag composed of a member non-woven fabric having water absorption, and such an invention may also be used. Furthermore, in the invention according to claim 4, an upper gusset portion formed of an inverted Z-shaped sheet is provided between the surface sheet and the front-side sheet portion for closing the chuck portion. One end of the inverted Z-shaped sheet of the upper gusset portion and the surface sheet are connected by a seal portion in the upper direction of the surface sheet, and the other end of the inverted Z-shaped sheet of the upper gusset portion and the front-side sheet portion for closing the chuck portion are connected by a seal portion. A self-standing bag may also be used.

[0012] In addition to these, like the invention according to claim 5, the upper gusset portion formed of an inverted Z-shaped sheet between the surface sheet and the front-side sheet portion for closing the chuck portion has a lower folding portion of the inverted Z-shaped sheet material of the upper gusset portion located on the back sheet side and an upper folding portion of the inverted Z-shaped sheet material of the upper gusset portion located on the surface sheet side. A self-standing bag configured with the inverted Z-shaped sheet material in the folded state may also be used. Furthermore, like the invention according to claim 6, the upper gusset portion formed of an inverted Z-shaped sheet is formed by an end portion composed of an inverted Z-shaped sheet material having a seal portion with the front-side sheet portion for closing the chuck portion and an end portion composed of a surface sheet having a seal portion, and each is an upper gusset portion located at both ends. Between these two end portions sandwiched therebetween, a self-standing bag in which a mountain-folded upper gusset portion centered on the upper folding portion of the upper gusset portion is located in the center may also be used.

Advantages of the Invention

[0013] First, according to the invention of claim 1, drips of fresh products such as fruits contained in the bag body can be poured into the folded portion of the lower gusset portion on the surface sheet side and can be prevented from soaking into the non-woven fabric, so that the so-called drips can be separated from the used product and retained separately.

[0014] Therefore, since the drip is separated from the product, not only can visual freshness be obtained, but also deterioration of the product due to the drip can be prevented, and there are many advantages such as maintaining freshness, preventing the growth of bacteria, and maintaining safety in terms of hygiene while maintaining freshness.

[0015] Moreover, even when the resin bags according to the present invention are stacked, the bag bodies can be stacked without being crushed. Therefore, it has the advantage of enabling the display or storage of many bags within a small area. Next, according to the invention of claim 2, the drip can be efficiently absorbed into the polyolefin fiber cross-laminated nonwoven fabric, and a lot of drips can be retained between the intersecting fibers without being easily spilled.

[0016] Also, according to the invention of claim 3, the drip can be retained. Furthermore, according to the inventions of claims 4 to 6, the storage portion of the bag body can be enlarged. Moreover, an upper surface portion of a certain size can be formed on the upper part of the storage portion of the bag body. Furthermore, the upper surface portion can be configured to be flat and can form a cavity portion that can stably store a cylindrical tubular portion. Therefore, an upper surface portion can be formed on which the self-standing bag according to the present invention can be placed and stacked.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0018] FIG. 1 is a diagram showing an example of a stand-up pouch according to the present invention. The stand-up pouch shown in this figure is a transparent pouch made of resin. The bottom is formed as a gusset portion, and the width of the upper opening is long. After narrowing down the width at the central portion of the pouch body to be shorter than the opening, it is hung downward toward the bottom to form the bottom with this short width. That is, it is a stand-up pouch composed of a front surface (1) sheet, a back surface (2) sheet, and a front-side sheet portion (3) for closing the chuck portion. It is a pouch body that narrows down at the central portion which is the body portion of the pouch body, and has a width smaller than the opening in the bottom direction. It is a pouch body that becomes slightly smaller in diameter at the bottom through the narrowing portion from the width of the pouch body opening, and is composed of a pouch body including the vicinity of the opening, the body portion, and the bottom.

[0019] This figure is a diagram particularly showing the state as viewed from the front side. The upper opening has a chuck portion (4), and it is a pouch body that can open the opening by opening the chuck portion (4) and seal it by closing the chuck portion (4). The upper part of the pouch body has a sheet-like upper gusset portion (10), and the upper gusset portion (10) has an upper folding portion (11) and a lower folding portion (12). The upper gusset portion (10) is in an inverted Z shape, and one end thereof is connected to the surface (1) by a seal portion (8) in the lower direction at a certain interval from the opening of the pouch body surface (1).

[0020] The reverse Z-shaped other end of the upper gusset portion (10) is connected by a seal portion (9) to the lower portion of the front side sheet portion (3) for closing the chuck portion, which has a chuck portion (4) that is openably and closably chucked with the chuck portion (4) on the back surface of the bag body. Therefore, one end of the reverse Z shape of the upper gusset portion (10) is connected by a seal portion (8) to the front surface (1) of the bag body, formed by folding it in the direction of the bag body opening. Furthermore, the reverse Z-shaped sheet of the upper gusset portion (10) is folded by the upper folding portion (11) and folded in the direction of the lower portion of the bag body.

[0021] The reverse Z-shaped sheet folded in this downward direction is folded back by the lower folding portion (12) and sealed to the front side sheet portion (3) for closing the chuck portion at the lower portion of the chuck portion (4) on the back surface of the bag body, forming the seal portion (9). Therefore, the upper part of the bag body has a reverse Z-shaped and sheet-like upper gusset portion (10), which can give a certain width to the upper part of the bag body, can increase the storage capacity of the bag body, and can form an upper surface portion of a certain size at the upper part. Furthermore, the chuck portion (4) forms a chuck portion (4) that openably and closably chucks the back surface of the bag body and the front side sheet portion (3) for closing the chuck portion.

[0022] Next, the bag body itself is sealed by the side seal portion (5), and is further constricted at the body portion of the bag body, that is, the central portion, and the constricted side is also sealed. Therefore, this constricted side portion is also sealed by the constriction seal portion (6), and the constriction of the seal extends from the side portion along the constriction inclination into the bag body direction and is also sealed inside the bag body. However, the seal portion is formed up to the vicinity of the lower central portion of the bag body, but the central portion is not sealed, and no constriction seal portion is formed at the central portion.

[0023] The lower portion of the bag body formed in this way has a lower gusset portion (15). This lower gusset part (15) forms a folding part (16) at the upper part of the bottom having a certain width on this drawing.

[0024] Therefore, the lower part of the bag body is configured to open at this gusset part. In this case, the narrowing seal part (6) is also sealed in the lower gusset part (15), but the narrowing seal parts formed from both sides respectively finish sealing before they contact each other, and the central part of the bag body is not sealed. Furthermore, both sides of the bottom formed with a certain width are sealed (7) on the front and back surfaces together with the folding of the gusset, and are integrated.

[0025] Therefore, the bottom forms a seal part (7) sealed on both sides, but has a space formed by the stored items at its central part, and thus forms a so-called cylindrical bottom. Furthermore, the folding part of the lower gusset part (15) on the surface side of the gusset part at the bottom of the self-standing bag body according to the present invention has a polyolefin fiber cross-laminated nonwoven fabric (13). For example, in addition to a nonwoven fabric formed by laminating a vertically-based nonwoven fabric and a horizontally-based nonwoven fabric, a general nonwoven fabric may be used. Such a nonwoven fabric (13) is formed between the folding parts of the bottom of the lower gusset part (15).

[0026] Figure 2 is a view showing an example of the self-standing bag according to the present invention, and in particular, is a view of the bag body viewed from the back surface. The self-standing bag shown in this figure is a transparent bag made of resin, forms the bottom as a gusset part, has a long width at the upper opening part, narrows at the central part of the bag body to form a width shorter than the opening part, and then hangs downward to form the bottom with this short width, and is a view of the back surface side. Similar to Figure 1, the upper opening part has a chuck part (4). By opening the chuck part (4), the opening of the bag body can be opened, and by closing the chuck part (4), the bag body can be sealed.

[0027] The chuck part (4) forms a chuck part (4) that can open and close the chuck part (4) on the back surface of the bag body (2) and the chuck part (4) on the front side sheet part (3) for closing the chuck part. The front side sheet part (3) for closing the chuck part is in a sheet shape, and the other end of the inverted Z-shaped upper gusset part (10) is connected by a seal part (8). The upper gusset (10) part has an upper folding part (11) and a lower folding part (12). Furthermore, one end of the inverted Z-shaped upper gusset part (10) which is also in a sheet shape is connected by a seal part (8) to the front surface of the bag body (1).

[0028] Next, the bag body itself is sealed by a side seal part (5), and is further constricted at the body part of the bag body, that is, the central part, and the sides of the constriction are also sealed by a constriction seal part (6). Therefore, this constriction seal part (6) is also sealed in the direction of the inside of the bag body. Furthermore, a lower gusset part (15) is provided at the bottom. This lower gusset part (15) forms a folding-back part (16) on the upper part of the bottom having a certain width. Therefore, the lower part of the bag body is configured to open with this gusset part.

[0029] In this case, the constriction seal part (6) is also sealed in the lower gusset part (15), but the constriction seal parts formed from both sides are sealed before they contact each other, and the central part of the bag body is not sealed. In addition, on the back side gusset part (15) at the bottom, there is a parallel seal part (17) parallel to the bottom surface from one side seal part (7) at the bottom to the other side seal part (7) at the bottom. The parallel seal (17) seals beyond the constriction seal part (6) in the middle, and intersects with the constriction seal part (6) at a position in the middle where the constriction seal part (6) is located.

[0030] Therefore, the bottom gusset portion has the bottom being the portion sealed by the narrowing seal portion (6) on the surface (1) side. However, since the central portion of the bag body is not sealed, the central portion has a cavity all the way to the very bottom of the lower gusset (15). On the other hand, on the back surface (2) side, the parallel seal portion (17) that intersects at the middle portion of the narrowing seal portion (6) serves as the bottom on the back surface (2) side of the lower gusset portion (15), and the upper portion of the lower gusset portion (15) becomes the bottom compared to the surface (1) side. Therefore, the bottom surface of the lower gusset portion (15) formed with such a configuration is formed at a higher position on the back surface (2) side and at a lower position on the surface (1) side. On the surface (1) side, it has a configuration where it continues to the folded bottom of the gusset, that is, the cavity at the very bottom of the bag body at its central part, and the bottom surface itself forms a surface inclined toward the front side.

[0031] FIG. 3 is a view showing an example of a cross-sectional view of a self-supporting bag body according to the present invention. Particularly, it is a cross-sectional view taken along line A - A of FIG. 1. In the case shown in this figure, it is a view showing an example of the state where the inside of the bag body bulges when the self-supporting bag body according to the present invention contains contents. It consists of a surface (1) sheet, a back surface (2) sheet, a front-side sheet portion (3) for closing the chuck portion, and an upper gusset portion (10) of an inverted Z-shaped sheet, and has a lower gusset portion (15) composed of the front and back surfaces at the bottom of the bag body. It has a chuck portion (1) between the surface (1) sheet and the front-side sheet portion (3) for closing the chuck portion, and the opening of the bag body can be opened and closed by the chuck portion (1).

[0032] First, one end of the inverted Z-shaped sheet of the upper gusset portion (10) and the surface (1) are connected by a seal portion (8) in the upper direction of the surface (1), and the other end of the inverted Z-shaped sheet of the upper gusset portion (10) and the front-side sheet portion (3) for closing the chuck portion are connected by a seal portion (9). The bottom of the bag body has a lower gusset portion (15), which is sealed by a narrowing seal portion (6). Furthermore, a fiber cross-laminated nonwoven fabric (13) is disposed inside the fold of the lower gusset portion (15) on the surface (1) side of the bottom of the bag body. This may be a general nonwoven fabric in addition to the fiber cross-laminated nonwoven fabric.

[0033] Furthermore, the lower gusset portion (15) on the back surface (2) side of the bottom of the bag body is sealed not only by the above-described constriction seal portion (6) but also by a parallel seal portion (17). FIG. 4 is a diagram showing an example of a cross-sectional view of the self-supporting bag body according to the present invention. In the case shown in this figure, as in FIG. 3, it is an example of a state where the inside of the bag body is swollen when the self-supporting bag body according to the present invention contains contents, and is a cross-sectional view taken along line B - B of FIG. 1. The storage object is placed inside the bag body according to the present invention, and there is a space in the bag body trunk portion in the cross-sectional view taken along line B - B of FIG. 1.

[0034] In this case, as an example, the bag body opening is open, and the space between the chuck portion (4) of the back surface (2) sheet and the chuck portion (4) of the front side sheet portion (3) for closing the chuck portion is open.

[0035] Therefore, it is an example of a state where the opening of this bag body is open. In this state, the storage object can be put in and taken out of the bag body. Furthermore, when the bag body contains contents, the upper gusset portion (10) of the reverse Z-shaped sheet is also in a state where the reverse Z is open, and the inside of the bag body is open. Particularly, it is a cross-sectional view taken along line B - B of FIG. 1, is a cross-section of the central portion of the bag body, the internal cavity of the bag body is widely formed, and considering the bending of the front and back sheets, etc., the cavity portion inside the bag body can be further widened. From this, the bag body has a large capacity.

[0036] Next, the bottom of the self-supporting bag body according to the present invention has a bottom gusset portion (15). In such a case, the back surface (2) side of the bag body is sealed by a parallel seal portion (17). From above this sealing part (17), the lower gusset part (15) of the bottom surface is formed in the direction of the inner bottom of the bag body, and forms the bottom of the bag body. Furthermore, regarding the central part of the bottom gusset part (15) on the surface (1) side of the bottom of the bag body, there is no constriction sealing part at this position, and there is a folded part of the lower gusset part (15) on the surface (1) side up to the bottom of the bag body.

[0037] Therefore, only the folded part of the lower gusset part (15) exists, and there is no sealing part at all.

[0038] This means that the inside of the bag body and the inside of the folded part of this lower gusset part (15) are in a communicating state. In this case, the lower gusset part (15) of the surface (1) part of the bag body has a polyolefin fiber cross-laminated non-woven fabric (13). Furthermore, regarding the lower gusset part (15) at the bottom, the bottom of the bag body of the lower gusset part (15) is formed with the upper part being the part sealed by the parallel sealing part (17) on the back surface (2) side, and on the surface (1) side, it is the lower bottom surface of the lower gusset part (15) where the bottom of the folded part of the lower gusset part (15) communicates. In this case, on the surface (1) side, a fiber cross-laminated non-woven fabric (1) is disposed in the folded part of the lower gusset part (15).

[0039] Therefore, the bottom surface of the lower gusset part (15) forms an inclined surface from the back surface (2) side to the surface (1) side, and the liquid such as drip accumulated at the bottom inside the bag body flows to the surface (1) side due to the inclined surface from the back surface (2) side to the surface (1) side, and further flows from both side parts of the bag body on the surface (1) side toward the central part of the bag body. Furthermore, since the constriction sealing part (6) is formed on the surface (1) side, the liquid such as drip accumulated at the bottom on the surface (1) side inside the bag body also flows along the constriction sealing part (6) to the central part of the bag body. This means that liquids such as drips accumulated at the bottom of the lower gusset portion (15) inside the bag on both sides of the back surface (2) side or the front surface (1) of the bag body will flow into the folded portion of the lower gusset portion (15) in the central part of the bag body, where there is no constriction seal portion from both sides of the central part of the front surface (1) portion of the bag body.

[0040] In particular, a polyolefin fiber cross-laminated non-woven fabric (13) is arranged at the folded portion, and the drips of the liquid will be soaked into the polyolefin fiber cross-laminated non-woven fabric (13). In particular, this fiber cross-laminated non-woven fabric is a non-woven fabric formed by laminating a non-woven fabric with a vertical tone and a non-woven fabric with a horizontal tone. Drips composed of liquid will penetrate between these fibers and be retained between the fibers. This means that drips composed of liquid can be retained within the fiber cross-laminated non-woven fabric. Therefore, once the drips penetrate into the fiber cross-laminated non-woven fabric, as long as they are within the retentive range, they can be retained within the fiber cross-laminated non-woven fabric and will not flow back into the bag body.

[0041] Thus, the drips from fresh products including fruits etc. inside the bag body can be retained within this fiber cross-laminated non-woven fabric, will not flow back to the fresh product side, and can be stored in a separated state. In this case, the fiber cross-laminated non-woven fabric is mounted between one side and the other side of the bag body at the folded portion of the lower gusset portion (15) and is arranged and mounted across the entire width direction on the front surface (1) side of the bag body. Therefore, since there is a certain amount of the fiber cross-laminated non-woven fabric at such a position, a relatively large amount of drips can be retained between the fibers of this fiber cross-laminated non-woven fabric. In particular, a constriction seal portion (6) is provided at the upper part of the fiber cross-laminated non-woven fabric, and a large portion is blocked from the inside of the bag body by the constriction seal portion (6).

[0042] Therefore, basically, it is not directly connected to the inside of the bag body at many positions, and only the constricted seal part (6) in the central part of the bag body communicates with the inside of the bag body. Even if there is drip oozing from the fiber cross-laminated non-woven fabric located in the folded part of the lower gusset part (15), it is almost impossible for the drip to flow back into the bag body. Even if it occurs, it is considered to be extremely small in quantity. Therefore, regarding the products such as fruits and fresh products in the bag body, the drip oozing from them is separated from the products and isolated in the fiber cross-laminated non-woven fabric (13) in the folded part of the lower gusset part (15) in a separated state. The drip in the bag body is isolated from the products at a different location, that is, in the folded part of the lower gusset part (15) on the surface (1), and can be stored at such a location.

[0043] In this case, it was clearly stated that it has a polyolefin-based fiber cross-laminated non-woven fabric at such a location, and the explanation was based on such a configuration. However, this is the optimal example and is not limited to this. It may use a fiber cross-laminated non-woven fabric made of other resin materials. Furthermore, it is not limited to this fiber cross-laminated non-woven fabric, and various general non-woven fabrics may be used.

[0044] Or, as long as it can be stored at a location where the drip is stored or absorbed and isolated from the product. This can store the drip in the fiber cross-lamination. And due to the fiber cross-lamination, the interval between the fibers can be increased, and more drip can be retained in the fibers. Furthermore, due to its polyolefin nature, it has advantages such as being able to prevent adhesion to the sheet material. However, it is not limited to this configuration, and general non-woven fabrics may be used. Or, it may be formed of other general resins, other materials, for example, fibrous paper products, etc., or other moisture-absorbable members may be used.

[0045] Figure 5 is a view showing an example of the state of the self-supporting bag body according to the present invention as viewed from the side. In the case shown in this figure, it is a view seen from the side when the bag body is in a swollen state. This bag body is formed by sealing a front surface (1) sheet and a back surface (2) sheet at a side edge portion with a side edge seal portion (5).

[0046] The opening of the bag body is sealed by the chuck portion (4) of the back surface (2) sheet of the bag body and the chuck (4) of the front side sheet portion (3) for closing the chuck portion.

[0047] Such a bag body has an upper gusset portion (10). One end of the inverted Z-shaped sheet of the upper gusset portion (2) is sealed by the front side sheet portion (3) for closing the chuck portion and a seal portion (9), and the other end of the inverted Z-shaped sheet of the upper gusset portion (10) is sealed by the front surface (1) sheet and a seal portion (8), and an upper surface portion can be formed in the space inside the bag body. That is, when the contents are stored in the bag body and the chuck portion (4) is closed, the inverted Z-shaped sheet is extended laterally by the contents in the bag body, and an upper surface portion inside the bag body will be formed. Therefore, when the contents are put into the bag body and the chuck portion (4) is closed, the front surface (1) sheet and the back surface (2) sheet of the bag body will separate, and it will be configured in a substantially cylindrical shape.

[0048] Therefore, the portion that divides the inside of the bag body in the upward direction becomes the upper surface portion, which is formed by the inverted Z-shaped sheet of the upper gusset portion (10). Furthermore, the bottom of the bag body is constituted by a lower gusset portion (15). When the contents are put into the bag body and the chuck portion (4) is closed, the front surface (1) sheet and the back surface (2) sheet of the bag body will separate, and it will be configured in a substantially cylindrical shape, and its bottom portion is constituted by the lower gusset portion (15). In particular, this self-standing bag body is formed by sealing both side edges with side edge seals (5), and both sides of the bottom portion are also sealed with bottom side edge seal portions (7). When the contents are stored inside the bag body and the body swells, the bottom portion of the bag body will also be formed in a circular shape of a cylindrical shape.

[0049] Therefore, it spreads widely in a cylindrical shape and becomes a highly self-standing shape. Furthermore, the bottom will form a bottom for storing the contents, and it is constituted by the lower gusset portion (15). The lower gusset portion (15) has a slightly upper part in the direction of the back surface (2), is inclined slightly downward in the direction of the front surface (1), and forms an inclined surface that communicates to the bottom of the folded portion at the center of the front surface. Furthermore, the folded portion of the lower gusset portion (15) on the front surface side has a polyolefin fiber cross-laminated nonwoven fabric (13).

[0050] Therefore, the bottom formed by the lower gusset portion (15) is a surface that slopes obliquely from the direction of the back surface (2) sheet toward the direction of the front surface (1) sheet portion, and particularly has an inclined surface that communicates to the bottom at the center of the bag body. Therefore, so-called drips generated by spilling or oozing from the contents in the bag body flow to the central portion of the front surface sheet due to this inclined surface. There is a polyolefin fiber cross-laminated nonwoven fabric at this position, and the drips can be retained within the fibers of such nonwoven fabric. Therefore, the drips in the bag body can be isolated from the product and stored.

[0051] FIG. 6 is a view showing an example of a state in which a watermelon (W) cut into a block shape is stored in the self-standing bag according to the present invention shown in FIG. 5. As shown in this figure, a bag body capable of storing a large number of block watermelons (W) in the bag body can be provided. As shown in this figure, first, the bag body according to the present invention becomes cylindrical by storing the contents. Therefore, it becomes a so-called cylindrical shape.

[0052] Particularly, by using a film having a waist on the front surface (1) sheet and the back surface (2) sheet, for example, a plurality or a large number of laminated sheets, it becomes easier to form into a cylindrical shape. For example, when using a multilayer film such as a polypropylene, polyester, and polyethylene multilayer film, or when using a film with thickness as a sheet material with a waist, it is likely to become cylindrical.

[0053] Alternatively, a sheet material using a multilayer or multi-layered film of other film materials may also be used. Furthermore, the lower gusset portion (15) and the reverse Z-shaped upper gusset portion (10) may use a soft general film material. In addition, regarding the multilayer or multi-layered film, a multilayer film using paper, aluminum, etc. other than resin together with resin is of course acceptable.

[0054] Figure 7 is a view of the state excluding the display of the stored items with the inside of the self-supporting bag shown in Figure 6 inflated. As shown in this figure, when the storage part for the contents is inflated, it becomes cylindrical and can be self-supporting. In this case, the upper part of the bag body constitutes a substantially cylindrical hollow part, and the lower part of the bag body becomes a narrow cylindrical shape. Therefore, the width of the cylindrical part in the direction of the bottom of the bag body is narrower than the width of the upper hollow part.

[0055] From this, the lower bottom fits into the upper hollow part. This means that the self-supporting bag according to the present invention in the state of storing the stored items can further stack another self-supporting bag according to the present invention in the state of storing the stored items in this bag. Thus, when displaying and selling in a store or storing, etc., a plurality of self-supporting bags according to the present invention containing contents can be stacked on top of each other, and in this state, the stacked state can be maintained without deforming the storage shape of the bag body.

[0056] Of course, stacking a large number of bag bodies is difficult to some extent depending on the material of the sheet material, but at least double stacking is sufficiently possible, and a large number of products can be displayed beautifully when displaying and selling in a store. Alternatively, triple stacking may be possible depending on the material. During storage and transportation, it is possible to store and transport the bags in a stacked state without deforming the shape of the bag body.

[0057] FIG. 8 is a view showing an example of a state in which block watermelons (W) are stored in the bag body shown in FIG. 7.

[0058] As shown in this figure, when the storage object is stored in the bag body, the upper part of the bag body forms a cylindrical hollow part, and the lower part of the bag body is a cylinder with a smaller diameter than the upper part. Therefore, this lower cylindrical tubular part can be stored in the upper hollow part of another self-standing bag.

[0059] FIG. 9 is a view showing an example of a state in which cut watermelons are stored in two self-standing bags according to the present invention, and one self-standing bag is stored in the hollow part above the other self-standing bag. Therefore, it is possible to stack the self-standing bags according to the present invention in which the contents are stored in this way. The upper gusset part (10) has an upper folding part (11) and a lower folding part (12), and is in an inverted Z shape. Furthermore, the end of the inverted Z-shaped sheet material of the upper gusset part (10) located at the lower part of one end of the inverted Z is sealed to the surface sheet of the bag body by a seal part (8).

[0060] Furthermore, the end located at the other end of the inverted Z of the inverted Z-shaped sheet material of the upper gusset part (10) is sealed and continuously provided by a seal part (9) with the lower part of the chuck part (4) on the back surface of the bag body and the front side sheet part (3) continuously provided with the chuck part. Therefore, due to such a configuration, the lower folding part (12) of the inverted Z-shaped sheet material of the upper gusset part (10) is located on the back surface side, and the upper folding part (11) of the inverted Z-shaped sheet material of the upper gusset part (10) is located on the front surface side, and an inverted Z-shaped sheet material in a folded state is arranged. When the body part of the bag body is expanded in such a folded state, it is continuously provided by a seal part (8) in the direction of the central part of the surface sheet material, and the immediately connected upper gusset part (10) faces upward.

[0061] Furthermore, the upper gusset portion (10) on the back side of the upper gusset portion (10) is connected to the front side sheet portion (3) for closing the chuck portion and the seal portion (9) in the vicinity of the chuck portion of the bag body, that is, the seal portion (9) in a slightly upper direction, and the immediately connected upper gusset portion (10) faces downward. Therefore, the three connected pieces with two reverse Z-shaped folds are arranged in the upward, downward, and upward directions from the front surface to the back surface, and in the expanded state, both end portions are in the sheet folding shape arranged in the upward direction around the upper folding portion of the upper gusset portion.

[0062] Therefore, both end directions are formed by an end portion constituted by a reverse Z-shaped sheet material having the front side sheet portion (3) for closing the chuck portion and the seal portion (9), and an end portion constituted by the front surface (3) sheet having the seal portion (8), and each becomes the upper gusset portion (10) located at both ends. Between these two end portions sandwiched therebetween, a so-called mountain-folded upper gusset portion (10) centered on the upper folding portion (11) of the upper gusset portion (10) is located at the center. When the so-called mountain-folded upper gusset portion (10) centered on such an upper folding portion (11) is expanded, a cylindrical cavity portion that forms a stable upper surface portion is formed.

[0063] That is, an upper surface portion can be formed in the direction in which the center portion is recessed in the open state. Therefore, the lower cylindrical tubular portion of another self-standing bag can be stably stored in the cavity portion. In addition, although a chuck portion is used when opening the bag body in the description of the present invention, in addition to the configuration having this chuck portion, a configuration in which the opening is sealed with paste or tape without having a chuck portion when sealing the opening may also be provided.

Explanation of Reference Numerals

[0064] 1 Front surface 2 Back surface 3 Front side sheet portion for closing the chuck portion 4 Chuck portion 5 Side seal portion 6 Narrowing seal portion 7 Bottom side seal portion 8 Seal portion of the upper gusset portion 9 Seal portion of the upper gusset portion 10 Upper gusset portion 11 Upper folding portion of the upper gusset portion 12 Lower folding portion of the upper gusset portion 13 Fiber cross-laminated nonwoven fabric 15 Lower gusset portion 16 Folded-back portion of the lower gusset portion 17 Parallel seal portion Watermelon cut into W-block shape

Claims

1. A self-standing bag comprising a front surface (1) sheet, a back surface (2) sheet, and a front side sheet portion (3) for closing the chuck portion, The bag body is constricted at the central portion which is the body portion of the bag body, and has a width smaller than the opening at the bottom direction. The bag body has a slightly smaller diameter at the bottom through the constriction portion from the width of the bag body opening. The bag body is composed of the vicinity of the opening, the body portion, and the bottom, The side edge portion near the opening of the bag body has a side seal portion (5), the side edge portion of the constriction portion also has a constriction seal portion (6), and the side edge portion of the bottom of the bag body also has a bottom side edge portion seal portion (7), There is an upper gusset portion (10) composed of an inverted Z-shaped sheet between the front surface (1) sheet and the front side sheet portion (3) for closing the chuck portion, The bag body has a lower gusset portion (15) at the bottom of the bag body, There is a chuck portion (4) between the back surface (2) sheet and the front side sheet portion (3) for closing the chuck portion, and it is a self-standing bag capable of opening and closing the opening of the bag body by opening and closing the chuck portion (4), The side edge portion of the constriction portion and the constriction seal portion (6) also extend from the side edge portion along the constriction inclination directly into the bag body direction and form a seal portion inside the bag body. However, it has a constriction seal portion (6) that is formed up to the vicinity of the central portion of the bag body, and the central portion does not form a seal portion, A self-standing bag characterized in that the folded portion of the lower gusset portion (15) on the front surface (1) sheet side has a non-woven fabric.

2. The self-standing bag according to claim 1, characterized in that the non-woven fabric is a polyolefin fiber orthogonal laminated non-woven fabric.

3. The self-standing bag according to claim 1, characterized in that the non-woven fabric is a member having water absorption.

4. The upper gusset portion (10) composed of an inverted Z-shaped sheet between the front surface (1) sheet and the front side sheet portion (3) for closing the chuck portion, At one end of the inverted Z-shaped sheet of the upper gusset portion (10) in the upper direction of the front surface (1) sheet, it is connected to the front surface (1) sheet by a seal portion (8), and at the other end of the inverted Z-shaped sheet of the upper gusset portion (10), it is connected to the front side sheet portion (3) for closing the chuck portion by a seal portion (9). The self-standing bag according to claim 1, characterized by this.

5. The upper gusset portion (10) composed of an inverted Z-shaped sheet between the front surface (4) sheet and the front side sheet portion (4) for closing the chuck portion is, The lower folding portion (12) of the reverse Z-shaped sheet material of the upper gusset portion (10) is located on the back sheet side, and the upper folding portion (11) of the reverse Z-shaped sheet material of the upper gusset portion (10) is located on the front sheet side. The stand-up pouch according to claim 4, characterized in that it is arranged with a reverse Z-shaped sheet material in a folded state.

6. The upper gusset portion (10) made of a reverse Z-shaped sheet comprises an end portion formed by a reverse Z-shaped sheet material having a front sheet portion (3) for closing the chuck portion and a seal portion (9), and an end portion formed by a front surface (3) sheet having a seal portion (8). The upper gusset portions (10) are located at both ends respectively. Between these two end portions sandwiched therebetween, a valley-folded upper gusset portion (10) centered on the upper folding portion (11) of the upper gusset portion (10) is located at the center thereof. The stand-up pouch according to claim 4, characterized in that.

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