JP7383841B1 - freestanding bag - Google Patents

Abstract

[Problem] The present disclosure has an aesthetic appearance that can be used as a substitute for a rigid container for liquids, is environmentally friendly, can reduce manufacturing costs, and does not cause discomfort when the body is held with the hand. The purpose is to provide a self-supporting bag. [Solution] A self-supporting bag 1 according to the present invention includes a laminate film having at least a base layer and a sealant layer as a body film 2, a vertical seal 16 is provided with the sealant layer inside, and an upper end 12 and a lower end 11 are open. The body part 10 has a flat cylindrical shape and has a left side edge 13 and a right side edge 14, an open side 21, an upper closed side 22, a left side 23, and a right side 24. The bottom film 3 includes a bottom gusset 20 inserted into the lower end of the body with the open side facing downward, and the body film and the bottom film are fixed by a bottom seal 30, and the bottom seal is It has at least a lower end seal portion 31 in which the lower end portions of the bottom film 3 and the lower end portions of the trunk film 2 that face each other are bonded. [Selection diagram] Figure 1

Description

The present disclosure relates to self-supporting bags.

BACKGROUND ART Conventionally, self-standing bags such as standing pouches have been known that include a body and a bottom, and the bottom is formed in a gusseted form (see, for example, Patent Documents 1 to 3).

JP2012-66828A Japanese Patent Application Publication No. 2011-195175 JP 2019-6435 Publication

In a self-standing bag such as that disclosed in Patent Document 1, side seals are provided on the left and right edges. Since this side seal is highly rigid, there were problems with the usability of the product, such as the side seal hitting the consumer's hand and causing pain when the consumer held it in their hand. In addition, a self-standing bag with a side seal as disclosed in Patent Document 1 has a bottom film folded in two with the base film layer side of nylon etc. on the inside and the sealant layer side of polyethylene etc. on the outside. The bottom film is inserted between the front and back body films, and the peripheral edges of the bottom film and the body film are thermally bonded to each other. At this time, the opposing surfaces of the bottom film that face inward in the folded state are not thermally bonded to each other because they are made of a high melting point film such as nylon. For this reason, there is a risk that independence may become unstable. Therefore, a measure is sometimes taken to expose the body film by providing a notch in a portion of the left and right edges of the bottom film, and to thermally bond the exposed body films to each other. However, with this measure, there are problems in that the number of manufacturing steps for the self-supporting bag is increased, and scraps are generated when providing the notch, resulting in relatively high costs. In addition, because the scraps are small, they are easily scattered, resulting in a problem of poor production efficiency. Further, self-supporting bags such as those disclosed in Patent Documents 2 and 3 do not have side seals, but the bottom member and the body are bonded to each other by separate adhesive members, resulting in a complicated structure. For this reason, there have been problems in that production efficiency is reduced and manufacturing defects such as poor adhesion are likely to occur. In addition, the bag made of a cylindrical film suffers from constrictions and distortions due to its low rigidity, making it unstable to stand on its own.

Furthermore, rigid containers such as plastic bottles are often used as containers for liquids such as beverages. However, rigid containers are difficult to crush when discarded, and even if they are crushed, there is a problem in that the waste is bulky. Therefore, there is a need for containers that can replace rigid containers.

The present disclosure provides a self-supporting bag that is aesthetically pleasing and environmentally friendly, can be used as an alternative to rigid containers for liquids, can reduce manufacturing costs, and does not cause discomfort when the body is held in the hand. The purpose is to provide.

The self-supporting bag according to the present invention has a laminate film having at least a base layer and a sealant layer as a body film, and a vertical seal is provided with the sealant layer inside, and the upper and lower ends are open. a flat body with a left side edge and a right side edge, an open side, an upper closed side opposite to the open side, and a left side connecting the left side of the open side and the left side of the upper closed side; and a right side connecting the right side of the open side and the right side of the upper end closed side, and a bottom film is inserted into the lower end of the trunk with the open side facing downward; The trunk film and the bottom film are fixed by a bottom seal, and the bottom seal is formed by bonding at least a lower end of the bottom film and a lower end of the trunk film that face each other. the bottom film is a laminate film having at least a base layer and a sealant layer, and the top closed side is a crease where the bottom film is folded in half with the base layer inside. The bottom seal includes a left side seal portion in which a region of a predetermined width from the left side of the bottom film and an inner surface of the body film are adhered, and a region of a predetermined width from the right side of the bottom film. The self-supporting bag further includes a right side seal portion to which the inner surface of the trunk film is adhered, and the self-supporting bag has a seal between the inner wall at the left edge of the trunk and the left side of the bottom film and the trunk. a left side gap seal having a gap between the inner wall at the right side edge and the right side of the bottom film, and the inner surfaces of the body film are adhered to each other in the entire gap on the left side edge side. a right-side gap seal portion in which the inner surfaces of the body film are adhered to each other throughout the gap on the right side edge side, and a right-side gap seal portion that is connected above the left-hand side seal portion and the left-side gap seal portion of the body film. further comprising: a left side connecting seal portion whose inner surfaces are adhered to each other; and a right side connecting seal portion which is connected above the right side seal portion and the right gap seal portion and whose inner surfaces of the trunk film are adhered to each other. It is characterized by By using a laminate film as the bottom film, barrier properties can be imparted not only to the body but also to the bottom, so that the barrier properties of the entire bag can be further enhanced. Furthermore, since the trunk film and the bottom film can be made of the same material, costs can be reduced.

In the self-supporting bag according to the present invention, it is preferable that the vertical seal is disposed between the left side edge and the right side edge. Since the left and right edges form creases, it is possible to eliminate the discomfort caused by the side seals hitting your hands no matter which part of the torso you grip.

In the self-supporting bag according to the present invention, the vertical seal may be disposed on the left side edge or the right side edge. By preventing pinholes in the bottom seal and the seal closing the top edge, the bag can be sealed more reliably. In addition, the side edge on the left and right side where the vertical seal is not provided forms a crease, and by gripping the bag around this part, it is possible to eliminate the discomfort caused by the side seal hitting the hand.

In the self-standing bag according to the present invention, it is preferable that the vertical seal is fixed to the outer surface of the body while being folded back along the outer surface of the body. Since the left and right edges form creases, it is possible to eliminate the discomfort caused by the side seals hitting your hands no matter which part of the torso you grip.

In the self-supporting bag according to the present invention, it is preferable that the vertical seal is free from the outer surface of the body and has a locking hole for suspending the self-supporting bag. By attaching a fastener such as a carabiner or hook to the locking hole, portability can be further improved.

According to the present disclosure, there is provided a self-supporting bag that has an aesthetic appearance that can be used as a substitute for a rigid container for liquids, is environmentally friendly, reduces manufacturing costs, and does not cause discomfort when the body is held by hand. can do.

FIG. 1 is a schematic front view showing a first example of a self-supporting bag according to the present embodiment. 2 is a schematic end view taken along line AA in FIG. 1. FIG. FIG. 7 is a schematic front view showing a second example of the self-supporting bag according to the present embodiment. It is a schematic front view which shows the modification of the self-supporting bag of the second example based on this embodiment. It is a schematic front view which shows the third example of the self-supporting bag based on this embodiment. It is a schematic front view which shows the modification of the self-supporting bag of the third example based on this embodiment. 7 is a schematic end view taken along line BB in FIG. 6. FIG. It is a schematic front view which shows the fourth example of the self-supporting bag based on this embodiment. It is a schematic front view which shows the modification of the self-supporting bag of the fourth example based on this embodiment. It is a figure for demonstrating an example of the manufacturing process of the bottom gusset of the self-supporting bag of a fourth example, (a) shows a 1st process, (b) shows a 2nd process. It is a figure for explaining an example of the manufacturing process of the self-standing bag of a fourth example, (a) is a 1st process, (b) is a 2nd process, (c) is a 3rd process, and (d) is a 4th process. Show the process. FIG. 4 is a schematic diagram showing a bottom gusset of the self-supporting bag shown in FIG. 3; It is a schematic diagram showing a first modification of a bottom gusset. It is a schematic diagram showing a second modification of the bottom gusset. It is a schematic diagram showing a third modification of the bottom gusset. It is a schematic diagram showing the fourth modification of a bottom gusset.

Next, the present invention will be described in detail by showing embodiments, but the present invention should not be interpreted as being limited to these descriptions. The embodiments may be modified in various ways as long as the effects of the present invention are achieved. In addition, in this specification, for convenience, when the trunk 10 is in a flat state as shown in FIG. The top, bottom, left and right sides when viewed from above are expressed as the top, bottom, left and right of the self-supporting bag 1. Here, there is no distinction between the front surface and the back surface, regardless of the presence or absence of the vertical seal portion or the printing of the trunk or bottom gusset, and one surface of the self-supporting bag can serve as either the front surface or the back surface. Specifically, when a certain surface is viewed from above, a bag in which the vertical seal is placed on the left edge becomes a bag in which the vertical seal is placed on the right edge when turned over. Further, in the drawings, the scale, dimensional ratio, thickness, etc. are exaggerated compared to the actual ones for convenience of illustration and ease of understanding.

The self-supporting bag 1 according to the present embodiment includes a first example of the self-supporting bag 1 (1A) shown in FIG. 1, a second example of the self-supporting bag 1 (1B) shown in FIGS. The self-supporting bag 1 (1C) of the third example and the self-supporting bag 1 (1D) of the fourth example shown in FIGS. 8 and 9 are included. First, a structure common to all examples will be explained using FIG. 1 as an example.

FIG. 1 is a schematic front view showing a first example of a self-supporting bag according to this embodiment. FIG. 2 is a schematic end view taken along line AA in FIG. 1. As shown in FIG. 1 or 2, the self-supporting bag 1 according to the present embodiment is a laminate film having at least a base layer 201 (shown in FIG. 2) and a sealant layer 202 (shown in FIG. 2) as the body film 2. The body part 10 has a vertical seal 16 with the sealant layer 202 inside and has a cylindrical shape with an open upper end 12 and a lower end 11, and the cylindrical shape is flattened and has a left side edge 13 and a right side edge 14. a side 21 , a top closed side 22 opposite to the open side 21 , a left side 23 connecting the left side of the open side 21 and the left side of the top closed side 22 , and a right side of the open side 21 and the top closed side 22 . and a bottom gusset 20 inserted into the lower end of the body 10 with the open side 21 facing downward. is fixed by a bottom seal 30, and the bottom seal 30 has at least a bottom seal part 31 to which the bottom ends of the bottom film 3 and the bottom ends of the trunk film 2, which face each other, are bonded.

The self-supporting bag 1 has a body part 10 and a bottom gusset 20, and becomes self-supporting by expanding the bottom gusset 20.

It is preferable that the body portion 10 has a substantially rectangular shape in plan view, having an upper end 12, a lower end 11, a left side edge 13, and a right side edge 14. In this specification, the ``abroximate'' prefix to ``shape'' refers to the approximate external shape without regard to details, and in addition to the actual shape, at least one of the corners of the shape It is meant to include various deformed shapes such as shapes where one corner is rounded or at least one corner is dropped, or a distorted shape. This means that it includes deformed shapes such as shapes in which at least one of the corners is rounded or at least one of the corners is rounded, or in which at least one side is slightly distorted. In addition, in this specification, the surface of the body 10 facing the accommodation space 15 is referred to as the inner surface of the body 10 or the inner surface of the body film 2, and the surface opposite to the side facing the accommodation space 15 is referred to as the inner surface of the body 10 or the inner surface of the body film 2. The surface may also be referred to as the outer surface of the body 10 or the outer surface of the body film 2.

The body part 10 is formed by bonding the inner surfaces of both side edges of a single sheet-like body film 2 to form a vertical seal 16 and forming a cylindrical shape, and by crushing the cylindrical shape into a flat shape. be done. The internal space of the body 10 serves as a storage space 15 for contents. Here, the term "flat" refers to a state in which, when there is no content in the storage space 15, the inner wall surfaces of the body films 2 facing each other are close to or in contact with each other, and the cross-sectional shape of the self-supporting bag 1 is elongated. means. Further, in this embodiment, the vertical seal 16 is arranged between the left side edge 13 and the right side edge 14 (as shown in FIGS. 1, 3, and 4), or either the left side edge 13 or the right side edge 14. It includes a form in which it is disposed on one side (as shown in FIGS. 5, 6, 8, and 9), and a form in which it is disposed on both the left side edge 13 and the right side edge 14 (not shown).

Although the upper end 12 of the body 10 is shown in an open state as an example in FIG. 1, it may be sealed with a fitting (not shown) or a seal (not shown), or may be sealed with a spout (not shown). ) may also be provided. By providing a spout at the upper end 12 of the body 10, it is useful as a substitute for a plastic bottle. For example, from the perspective of environmental conservation, many local governments require that the cap and printed shrink label of PET bottles be disposed of separately from the bottle itself. It takes time for consumers to dispose of the labels, and there is a risk of damaging their nails and fingers when peeling off the shrink labels. Since the self-supporting bag 1 according to the present embodiment can be directly printed on the body 10, there is no need to separate the labels at the time of disposal, and the bags can be disposed of without being separated from the spout. Therefore, it is possible to contribute not only to ease of disposal as household garbage, but also to reductions in work time, disposal costs, and labor costs at restaurants. Since the self-supporting bag 1 uses less resin than a PET bottle, it can be crushed into small pieces after use, making it possible to dramatically reduce the amount of waste. For example, in the self-standing bag 1 according to the present embodiment, after the contents are emptied, the body is folded from the bottom of the bag toward the top where the spout is located, with the cap removed, and then folded up to the bottom end of the spout. By the way, when the cap is tightened, the inside of the bag is kept in a reduced pressure state, so the volume of the waste product is about the size of a felt-tip pen. Moreover, if the self-supporting bag 1 is washed after use, it can be used repeatedly in the same way as a plastic bottle, and the load on the environment can be reduced. Since the self-supporting bag 1 can be manufactured at a lower cost than a plastic bottle, its economic effect is immeasurable.

As shown in FIG. 2, the body film 2 is a laminate film in which two or more layers are bonded together, and includes at least a base layer 201 and a sealant layer 202. The base layer 201 is a layer that provides mechanical strength as a packaging bag, suitability for printing, and the like. The sealant layer 202 is a layer that has heat fusion properties and provides bag-making processability. The material of the base layer 201 and the material of the sealant layer 202 may be selected from among those listed in <1> to <29> below, but are not particularly limited in this embodiment. Among these, it is preferable to use at least one of polyamide resin and polyethylene terephthalate resin as the material for the base layer 201, for example. As the material for the sealant layer 202, for example, it is preferable to use at least one of polyethylene and polypropylene, and it is more preferable to use linear low-density polyethylene. The number of layers of the base layer 201 and the number of layers of the sealant layer 202 may each be one layer or a multilayer of two or more layers.

<1> High-density polyethylene (HDPE)
<2> Medium density polyethylene (MDPE)
<3> Low density polyethylene (LDPE)
<4> Polypropylene (PP)
<5> Polyvinylidene chloride (PVDC)
<6> Polyvinyl chloride (PVC)
<7> Polystyrene (PS)
<8> Polyvinyl acetate (PVAc)
<9> Polytetrafluoroethylene (PTFE)
<10> ABS resin (acrylonitrile butadiene styrene resin)
<11> AS resin (SAN)
<12> Acrylic resin (PMMA)
<13> Polyamide (PA)/Product name Nylon <14> Polyacetal (POM)
<15> Polycarbonate (PC)
<16> Modified polyphenylene ether (m-PPE, modified PPE, PPO)
<17> Polybutylene terephthalate (PBT)
<18> Polyethylene terephthalate (PET)
<19> Cyclic polyolefin (COP)
<20> Polyphenylene sulfide (PPS)
<21> Polysulfone (PSF)
<22> Polyether sulfone (PES)
<23> Amorphous polyarylate (PAR)
<24> Liquid crystal polymer (LCP)
<25> Polyetheretherketone (PEEK)
<26> Thermoplastic polyimide (PI)
<27> Polyamideimide (PAI)
<28> Thermoplastic polyurethane (TPU)
<29> Fluororesin (PTFE)

The body film 2 may have one or more intermediate layers (not shown) laminated between the base layer 201 and the sealant layer 202 as appropriate. The intermediate layer is, for example, a barrier layer, a printed layer, a porous substrate layer such as a metal foil or paper. The barrier layer is a layer that prevents water vapor and/or oxygen from outside the self-supporting bag 1 from permeating the body film 2 and entering the inside of the self-supporting bag 1 . The barrier layer is, for example, a metal foil such as aluminum foil, a film made of a material having gas barrier properties such as ethylene vinyl alcohol copolymer resin (EVOH), or a barrier layer provided on at least one surface of the base layer 201. It is a thin film with The thin film having barrier properties is, for example, a coating film or a deposited film. The material of the coating film is not particularly limited, and is, for example, polyvinylidene chloride, and the forming method thereof is, for example, a roll coating method, a gravure coating method, a bar coating method, a spin coating method, a spray coating method, or an impregnation method. It can be formed by a known coating method. The material of the deposited film is not particularly limited, and may be aluminum, alumina, or silica, for example, and its formation method may be a known method such as a vacuum deposition method, a sputtering method, an ion plating method, or a plasma vapor deposition method. It can be formed by the following vapor deposition method. The method for forming the body film 2 is not particularly limited, and can be formed by bonding each layer together using a known lamination method such as an extrusion lamination method, a dry lamination method, or a coextrusion method. The thickness of the body film 2 is not particularly limited, but is preferably 50 to 250 μm, more preferably 80 to 200 μm.

The layer structure of the body film 2 is not particularly limited, but is, for example, NY/PE. In this specification, the layer structure is shown in order from one surface side of the film to the other surface side, and the material of each layer is shown in accordance with the general expression method in the technical field of packaging materials. It is sometimes expressed with / in between. Taking NY/PE as an example, the base layer 201 is made of NY, the sealant layer 202 is made of PE, and NY and PE are bonded to each other. Since NY has a lower oxygen gas permeability than other materials generally used for the base layer 201, it is particularly suitable for contents that are susceptible to oxidative deterioration. In order to further reduce the oxygen gas permeability, NY having a barrier layer may be used as NY.

The bottom gusset 20 closes the lower end 11 of the body 10. The bottom gusset 20 has a bag shape with one side open, and when there is no content in the storage space 15, the bottom gusset 20 is folded inside the body 10 and becomes a flat state, so that it can stand on its own. Although the bag 1 has a flat shape as a whole, when the contents are stored in the storage space 15, the folded state of the bottom gusset 20 is unfolded, and the self-supporting bag 1 can stably stand on its own. In this specification, when the bottom gusset 20 is shaped like a flat bag, the outer surface is referred to as the outer surface of the bottom gusset 20 or the outer surface of the bottom film 3, and the inner surface is referred to as the inner surface of the bottom gusset 20 or the bottom. It may also be referred to as the inner surface of the film 3.

The bottom gusset 20 has an open side 21, a closed top side 22, a left side 23, and a right side 24. As shown in FIG. 1, the bottom gusset 20 preferably has a substantially rectangular shape in plan view. Thereby, the yield of the bottom film 3 can be improved during manufacturing, and it can be efficiently produced, so that manufacturing costs can be suppressed. The open side 21 is the lower end of the self-supporting bag 1, and the opposing ends of the bottom film 3 are not bonded to each other. The upper end closed side 22 is a portion facing the accommodation space 15. The left side 23 is a portion of the left side edge 13 of the body 10 that faces the inner wall. The right side 24 is a portion of the right side edge 14 of the body 10 that faces the inner wall. At the upper end closed side 22, the left side 23, and the right side 24, the opposing ends of the bottom film 3 are continuous or adhered to each other.

As the material of the bottom film 3, the materials listed as the material of the trunk film 2 can be used. The material of the bottom film 3 may be the same as or different from the material of the trunk film 2. The thickness of the bottom film 3 is preferably thinner than the thickness of the trunk film 2. This allows the bottom gusset 20 to be opened more easily. For example, the thickness of the bottom film 3 is preferably 25 to 200 μm, more preferably 40 to 180 μm.

The bottom seal 30 is a portion in which the inner surface of the trunk film 2 and the outer surface of the bottom film 3 are partially adhered to each other when the bottom film 3 is inserted into the lower end of the trunk film 2. It includes at least a lower end seal portion 31. The lower end seal portion 31 is a portion where the outer surface of the bottom film 3 near the open side 21 and the outer surface of the trunk film 2 near the lower end 11 are bonded together. The bottom seal 30 is preferably bonded by heat sealing from the viewpoint of production efficiency, but may be bonded using an auxiliary material such as an adhesive.

Between the left and right side edges 13 and 14 of the body part 10 and the left and right sides 23 and 24 of the bottom gusset 20, there may be a gap 40 as shown in FIG. 1, or there may be no gap 40. (Illustrated). When there is a gap 40, the lower end 11 of the body 10 is bonded to the lower end seal portion 31 and the inner surface of the body film 2 in the gap 40, and the lower end seal portion 31 is bonded to the lower end seal portion 31, as shown in FIG. The gap is closed by continuous gap seal parts 51 and 52. If there is no gap 40, the lower end 11 of the body 10 is closed only by the lower end seal portion 31. Among these, it is more preferable that there is a gap 40. The presence of the gap 40 allows the bottom film 3 to be more easily inserted into the lower end of the body film 2. Therefore, production efficiency can be further improved.

Is the gap 40 provided only between the inner wall on the left side edge 13 of the body part 10 and the bottom gusset 20, or is it provided only between the inner wall on the right side edge 14 of the body part 10 and the bottom gusset 20? Alternatively, it may be provided both between the inner wall on the left side edge 13 of the body part 10 and the bottom gusset 20 and between the inner wall on the right side edge 14 of the body part 10 and the bottom gusset 20. The distance between the gaps 40 is not particularly limited, but is preferably 0.1 to 1.0 mm, more preferably 0.4 to 0.7 mm.

(First example self-standing bag)
Next, the characteristic structure of the first example of the self-supporting bag 1A will be explained. In the self-supporting bag 1A of the first example according to the present embodiment, the bottom film 3 is a laminate film having at least a base layer and a sealant layer, and the upper end closed side 22 is formed so that the bottom film 3 is double-sided with the base layer inside. The bottom seal 30 includes a left side seal portion 32 in which a region of a predetermined width from the left side 23 of the bottom film 3 and the inner surface of the body film 2 are adhered, and a right side 24 of the bottom film 3. The self-supporting bag 1A further includes a right side sealing part 33 in which a region of a predetermined width is bonded to the inner surface of the trunk film 2. and between the inner wall on the right side edge 14 of the body part 10 and the right side 24 of the bottom film 3, and the inner wall of the body part film 2 is formed in the entire area of the gap 40 on the left side edge 13 side. A left gap seal portion 51 whose surfaces are bonded to each other, a right gap seal portion 52 where the inner surfaces of the body film 2 are bonded to each other throughout the gap 40 on the right edge 14 side, a left side seal portion 32, and a left gap seal. A left side connecting seal part 53 is connected above the part 51 and the inner surfaces of the body film 2 are bonded together; It is preferable to further include a right side connecting seal portion 54 that is bonded.

In the self-supporting bag 1A of the first example, both the body film 2 and the bottom film 3 are laminated films. The trunk film 2 and the bottom film 3 may have the same layer structure or may have different layer structures. By making the body film 2 and the bottom film 3 of the same material, costs can be reduced. The layer structure of the body film 2 is not particularly limited, but is, for example, NY/PE. The layer structure of the bottom film 3 is not particularly limited, but is, for example, NY/PE. In the self-supporting bag 1A of the first example, barrier properties can be imparted not only to the trunk 10 but also to the bottom gusset 20, so that the barrier properties can be further enhanced in the entire self-supporting bag 1A.

In the self-standing bag 1A of the first example, the vertical seal 16 is arranged between the left side edge 13 and the right side edge 14 as shown in FIGS. 1 and 2, or on the left side edge 13 or the right side edge 14. It's okay. Among these, it is more preferable that the vertical seal 16 is disposed between the left side edge 13 and the right side edge 14 as shown in FIGS. 1 and 2. Since the left and right side edges 13 and 14 serve as folds of the trunk film 2, it is possible to eliminate discomfort caused by the vertical seal hitting the hand no matter which part of the trunk 10 is gripped.

The bottom gusset 20 is made by folding one bottom film 3 in half with the base layer inside, and inserting the bottom film 3 into the lower end of the body 10 so that the fold formed in half becomes the upper end closed side 22. At this time, the inner surfaces of the bottom film 3 facing each other on the left and right sides 23 and 24 are in a non-adhered state. Furthermore, the width of the bottom film 3 is designed to be shorter than the width of the flat cylindrical body 10, and the left and right side edges 13, 14 of the body 10 and the left and right sides 23, 24 of the bottom film 3 are A gap 40 is provided between them.

In the self-supporting bag 1A of the first example, the bottom seal 30 further includes a left side seal section 32 and a right side seal section 33 in addition to the lower end seal section 31. The left seal portion 32 is provided in an area of a predetermined width from the left side 23 , and the right seal portion 33 is provided in an area of a predetermined width from the right side 24 . Here, the predetermined width is not particularly limited, and can be appropriately designed to be about 1 to 10 mm, for example, depending on the dimensions of the bag or the weight of the contents. The bottom seal 30 includes a left side inclined seal part 34 extending diagonally between the open side 21 and the left side seal part 32, and a right side inclined seal part 35 extending diagonally between the open side 21 and the right side seal part 33. It may further contain. The left side inclined seal part 34 and the right side inclined seal part 35 may be provided continuously between the open side 21 and the left side seal part 32 or the right side seal part 33 (as shown in FIG. 1), or may be provided intermittently or partially. may be provided. Further, in FIG. 1, the boundary line of the left inclined seal part 34 on the accommodation space 15 side and the boundary line of the right inclined seal part 35 on the accommodation space 15 side are linear, and the left inclined seal part 34, the lower end seal part 31 and Although the right inclined seal portion 35 is shown in a row to form an inverted trapezoidal shape, the present invention is not limited to this. For example, the boundary line of the left inclined seal portion 34 on the accommodation space 15 side and the right inclined seal portion 35 on the side of the accommodation space 15 is formed into a circular arc shape protruding outward, and the left side inclined seal part 34, the lower end seal part 31, and the right side inclined seal part 35 are connected to form a circular arc shape (not shown). It's okay. In FIG. 1, the inner surface of the body film 2 and the outer surface of the bottom film 3, which face each other, are in a non-adhered state in a region surrounded by the lower end seal portion 31, the left side seal portion 32, and the left inclined seal portion 34. Although a form having a non-adhesive portion 60 is shown, the inner surface of the trunk film 2 and the outer surface of the bottom film 3 may be bonded to each other even in the portion that is the non-adhesive portion 60 in FIG. .

Furthermore, the self-supporting bag 1A has a left gap seal part 51 and a right gap seal part 52 in which the inner surfaces of the trunk film 2 are adhered to each other in the entire area of the left and right gaps 40, and a left gap seal part 51 and a right gap seal part 52. It further includes a left side connecting seal part 53 and a right side connecting seal part 54 which are connected to each other above and have the inner surfaces of the trunk film 2 bonded to each other. The left side 23 and the right side 24 of the bottom film 3 each have a notch 28, and the inner surfaces of the body film are bonded to each other within the notch 28 in the left side gap seal portion 51 and the right side gap seal portion 52. Preferably, it includes a portion. The left gap seal portion 51 and the right gap seal portion 52 can be bonded more firmly. The shapes of the boundary line of the left side connecting seal part 53 on the side of the housing space 15 and the boundary line of the right side connecting seal part 54 on the side of the housing space 15 are shown in FIG. 1 as an example in which the boundary line on the side of the housing space 15 is a straight line. However, the present invention is not limited to this, and for example, it may have an arcuate shape with an outward protrusion (not shown). Further, the boundary line of the left side connecting seal part 53 on the side of the housing space 15 and the boundary line of the right side connecting seal part 54 on the side of the housing space 15 are shaped like an outwardly projecting arc, and the boundary line of the left side connecting seal part 34 on the side of the housing space 15 is formed into an arc shape. The boundary line and the boundary line on the accommodation space 15 side of the right side inclined seal part 35 are made into an outwardly projecting arc shape, and the left side connecting seal part 53, the left side inclined seal part 34, the lower end seal part 31, the right side inclined seal part 35, and the right side The connecting seal portions 54 may be connected to form an arc shape (not shown).

In the self-standing bag 1A of the first example, since the inner surface of the bottom film 3 is made of the base layer, the inner surfaces of the bottom film 3 cannot be heat-sealed to each other, and the left and right sides 23 and 24 of the bottom film 3 face each other. The bottom films 3 are in a non-adhesive state, and the lower end 11 of the body portion 10 is not closed only by providing the lower end seal portion 31 and the gap seal portions 51 and 52. Therefore, by continuously providing the left side seal part 32, the left side gap seal part 51, and the left side connecting seal part 53, and by continuously providing the right side seal part 33, the right side gap seal part 52, and the right side connecting seal part 54, The lower end 11 of the body 10 is closed.

(Second example self-standing bag)
Next, with reference to FIGS. 3 and 4, the characteristic structure of the second example of the self-supporting bag 1B will be described. In the second example self-standing bag 1 (1B) according to the present embodiment, the bottom film 3 has at least a high melting point sealant layer on the first surface and a high melting point sealant layer on the second surface opposite to the first surface. The bottom seal 30 has a low melting point sealant layer with a low melting point, and has a flat bag shape with the first side inside and the sides other than the open side closed, and as shown in FIG. 3 or 4, the bottom seal 30 is , further includes a left-side inclined seal portion 34 extending diagonally between the open side 21 and the left side 23, and a right-side inclined seal portion 35 extending diagonally between the open side 21 and the right side 24; The seal portion 34 and the right side inclined seal portion 35 are preferably portions where the inner surface of the body film 2 and the bottom film 3, which face each other, are bonded together.

As will be explained later, the second example of the self-supporting bag 1B differs from the first example of the self-supporting bag 1A in the layered structure of the bottom film 3, and the inner surface of the bottom film 3 has heat sealability. For this reason, the sides other than the open side 21 of the bottom film 3, that is, the upper end closed side 22 and any one of the left and right sides 23, 24, are made a crease, and the remaining sides are closed by thermal bonding between the opposing bottom films 3. Can be done. As a result, the lower end 11 of the body portion 10 is closed only by the lower end seal portion 31 and the gap seal portion 50. As a result, the adhesive portion between the inner surfaces of the trunk film 2 at the left and right side edges 13 and 14 of the trunk 10 is only in a limited area at the lower end of the trunk 10, so that the bottom gusset 20 of the trunk 10 is not included. This eliminates the discomfort caused by the side seals hitting your hands even when you grip the parts that touch your hands.

In the bottom film 3, only the open sides 21 are opposite to each other, and the inner surfaces of the bottom film 3 are in a non-adhered state, and the upper end closed side 22, the left side 23, and the right side 24 are closed. As an example, the bottom film 3 is a single sheet-like film, a fold obtained by folding the single sheet-like film in half is the upper end closed side 22, and the inner surfaces of the sheet-like film are separated from each other at the edge opposite to the fold. Although the bonded portion is shown as an open side 21, and the inner surfaces of the sheet-like film are adhered to each other at both edges extending from both ends of the fold, and the closed portion is formed as a left side 23 and a right side 24, the present invention is not limited to this.

In the self-supporting bag 1B of the second example, the material of the bottom film 3 is a laminated film in which sealant layers made of materials having different melting points are disposed on the front and back sides, and the laminated film is The melting point of the sealant layer forming the film 2 side is lower than the melting point of the sealant layer forming the first surface (inner side, the side opposite to the body film 2 side). This makes it possible to thermally bond the opposing inner surfaces of the bottom film 3 to each other, while preventing the inner surfaces of the bottom film 3 from adhering to each other when forming the lower end seal portion 31. can be manufactured. The material of the low melting point sealant layer and the material of the high melting point sealant layer may be appropriately combined from among the materials listed as the material of the body film 2 that can be used as the sealant layer so as to provide a desired melting point difference between the front and back sides. There is no particular limitation, and for example, it is preferable to appropriately select from PE and PP. The melting point of the low melting point sealant layer is not particularly limited, but is preferably 70 to 100°C, more preferably 80 to 90°C. The melting point of the high melting point sealant layer is not particularly limited, but is preferably 90 to 130°C, more preferably 100 to 120°C. The melting point difference between the high melting point sealant layer and the low melting point sealant layer is preferably 10 to 50°C, more preferably 20 to 40°C.

In the self-supporting bag 1B of the second example, the bottom film 3 is preferably a laminate film in which a base layer is laminated between a high melting point sealant layer and a low melting point sealant layer. More preferably, the base layer has a barrier layer. Since barrier properties can be imparted not only to the body 10 but also to the bottom gusset 20, the barrier properties of the entire self-supporting bag 1 can be further enhanced. The material of the base layer is not particularly limited, and can be appropriately selected from, for example, the materials exemplified as the material of the trunk film 2. The layer structure of the bottom film 3 is not particularly limited, but is, for example, PE/NY/PE.

In the self-supporting bag 1B of the second example, the bottom seal 30 further includes a left side inclined seal part 34 and a right side inclined seal part 35 in addition to the lower end seal part 31. The left side inclined seal part 34 and the right side inclined seal part 35 may be provided continuously between the open side 21 and the left and right sides 23, 24 (as shown in FIG. 1), or may be provided intermittently or partially. It's okay. Further, in FIG. 3, the boundary line of the left inclined seal part 34 on the accommodation space 15 side and the boundary line of the right inclined seal part 35 on the accommodation space 15 side are linear, and the left inclined seal part 34, the lower end seal part 31, and Although the right inclined seal portion 35 is shown in a row to form an inverted trapezoidal shape, the present invention is not limited to this. For example, the boundary line of the left inclined seal portion 34 on the accommodation space 15 side and the right inclined seal portion 35 on the side of the accommodation space 15 is formed into a circular arc shape protruding outward, and the left side inclined seal part 34, the lower end seal part 31, and the right side inclined seal part 35 are connected to form a circular arc shape (not shown). It's okay.

In the second example of the self-supporting bag 1B, the vertical seal 16 is arranged between the left side edge 13 and the right side edge 14, as shown in FIG. 3 or 4. The vertical seal 16 is arranged outside the housing space 15 in the thickness direction of the body film 2 . As a result, the left and right side edges 13 and 14 become folds of the trunk film 2, so that no matter which part of the trunk 10 is gripped, it is possible to eliminate the discomfort caused by the side seals hitting the hands. The position where the vertical seal 16 is provided is between the left side edge 13 and the right side edge 14 as shown in FIG. 3, closer to the right side edge 14, or between the left side edge 13 and the right side edge 14 as shown in FIG. or between the left side edge 13 and the right side edge 14, closer to the left side edge 13 (not shown). Further, the shape of the vertical seal 16 is generally a substantially rectangular shape as shown in FIG. 3, but may have an irregular shape as shown in FIG. Further, as shown in FIG. 4, a locking hole 17 may be provided in the vertical seal 16 so that the vertical seal 16 can be hung.

(Third example self-standing bag)
Next, the characteristic structure of the third example of the self-supporting bag 1C will be explained with reference to FIGS. 5 to 7. The self-supporting bag 1C of the third example has the same structure as the self-supporting bag 1B of the second example except that the position of the vertical seal 16 is different. Therefore, descriptions of common configurations will be omitted.

In the third example of the self-supporting bag 1C, the vertical seal 16 is arranged on the left side edge 13 or the right side edge 14. Although the vertical seal 16 is arranged on the right side edge 14 in FIGS. 5 and 6, the present invention is not limited thereto, and the vertical seal 16 may be placed on the left side edge 13. By using the vertical seal 16 as a side seal, the following effects can be obtained. For example, since the thickness can be made uniform over the entire circumference of the opening edge of the upper end 12 of the body 10 that communicates with the accommodation space 15, the pinholes in the bottom seal 30 and the seal closing the upper end 12 of the body 10 can be made uniform. This allows the bag to be sealed more reliably. In addition, the side edge on the side where the vertical seal 16 is not provided among the left and right side edges 13 and 14 (the left side edge 13 in FIGS. 5 and 6) becomes the fold of the body film 2, so it can stand on its own around this part. By gripping the bag 1, it is possible to eliminate the discomfort caused by the side seal hitting the hand.

In the third example of the self-supporting bag 1C, the vertical seal 16 is free from the outer surface of the body 10 and has a locking hole 17 for suspending the self-supporting bag 1, as shown in FIG. It is preferable to have. The locking hole 17 is a through hole provided in the vertical seal 16, and its shape is not particularly limited. By attaching a fastener (not shown) such as a carabiner or hook to the locking hole 17, portability can be further improved. Therefore, it is suitable for applications that require portability, such as during outdoor activities or exercise. Further, although the vertical seal 16 is generally approximately rectangular in shape, it may have an irregular shape, for example by providing a partially wide portion as shown in FIG. It is also possible to use a wider seal than usual.

In addition, in the third example of the self-standing bag 1C, the vertical seal 16 is fixed to the outer surface of the body 10 while being folded back along the outer surface of the body 10, as shown in FIGS. 6 and 7. Preferably. Since the left and right side edges 13 and 14 serve as folds of the trunk film 2, it is possible to eliminate the discomfort caused by the side seals hitting the hands no matter which part of the trunk 10 is gripped. The method of fixing the vertical seal 16 to the outer surface of the body 10 is not particularly limited, and may be, for example, adhesion using a hot melt adhesive.

(Fourth example self-standing bag)
Next, the characteristic structure of the fourth example of the self-supporting bag 1D will be described with reference to FIGS. 8 to 11. The self-standing bag 1D of the fourth example includes the bottom film 3 at the lower end of the vertical seal 16, and the body film 2 and the bottom film 3 are bonded together. Same configuration as . Therefore, descriptions of common configurations will be omitted.

In the self-standing bag 1D of the fourth example, the bottom film 3 includes at least a high melting point sealant layer on the first surface 3a (illustrated in FIG. 10) and a second surface 3b (illustrated in FIG. 10) opposite to the first surface 3a. ) has a low melting point sealant layer having a lower melting point than the high melting point sealant layer, and the left side 23 is a fold line where the bottom film 3 is folded back with the first surface inward, as shown in FIG. 8 or 9. The vertical seal 16 is disposed on the right side edge 14 and has a lower end portion that is integrally bonded to the body film 2 with the right side 24 of the bottom film 3 being sandwiched between the body films 2. 16a, and the lower end 16a of the vertical seal 16 connects the adhesive part between the inner surface of the body film 2 and the bottom film 3 and the bottom film 3 along the thickness direction of the body film 2 and the bottom film 3. It is preferable to have an adhesive part between the films 3 and an adhesive part between the bottom film 3 and the inner surface of the body film 2.

In the self-standing bag 1D of the fourth example, the position of the vertical seal 16 and the side of the bottom film 3 included in the lower end 16a of the vertical seal 16 are both expressed as being limited to the right side, but as described above, , left and right are expressions for convenience, and when the self-supporting bag 1D in FIGS. 8 and 9 is viewed from above from the side opposite to the illustrated side, the position of the vertical seal 16 is the left edge of the body 10, The side of the bottom film 3 included in the lower end 16a of the vertical seal 16 is the left side. Therefore, in the fourth example of the self-supporting bag 1D, the expressions "left and right" mean left and right when the self-supporting bag 1D is viewed from above with the vertical seal 16 on the right side. In the fourth example of the self-supporting bag 1D, the vertical seal 16 is a side seal similarly to the third example of the self-supporting bag 1C (shown in FIG. 5 or 6). Get the desired effect.

In the self-standing bag 1D of the fourth example, it is sufficient that at least the upper end closed side 22 and the left side 23 are closed, and in FIGS. 8 and 9, as an example, the left side 23 Although the inner surfaces of the bottom film 3 are bonded to each other on the side extending from one end of the left side 23 to form the upper end closed side 22, the present invention is not limited to this. For example, the inner surfaces of the bottom film 3 may be bonded to each other at the left side 23 shown in FIGS. 8 and 9. The state in which the inner surfaces of the bottom films 3 are bonded to each other is obtained by heat-sealing a single bottom film 3 from above the fold line and bonding the bottom films 3 facing each other in a predetermined width area from the fold line. It also includes a form in which two bottom films 3 are stacked one on top of the other with the first side facing inside and the edges are adhered with a predetermined width.

As shown in FIG. 8, the fourth example of a self-supporting bag 1D has a vertical seal 16 that is free from the outer surface of the body 10, and has a locking hole 17 for suspending the self-supporting bag 1. It is preferable to have. The structure of the locking hole 17 and its effect are the same as that of the third example of the self-supporting bag 1C shown in FIG.

The end face across the body 10 in FIG. 9 is as shown in the end view in FIG. 7. In the self-supporting bag 1D of the fourth example, as shown in FIG. 8, it is preferable that the vertical seal 16 is fixed to the outer surface of the body 10 in a folded state along the outer surface of the body 10. The fixation of the vertical seal 16 and its effect are similar to the third example of the self-supporting bag 1C shown in FIG.

With reference to FIGS. 10 and 11, an example of the manufacturing process of the self-supporting bag 1D of the fourth example will be described. First, as shown in FIG. 10(a), a single sheet-like bottom film 3 is folded in half with the first surface 3a made of the high melting point sealant layer inside, and the closed left side 23 made of the fold is opened. Form. Next, as shown in FIG. 10(b), the inner surfaces of the bottom films 3 facing each other on the side extending from one end of the left side 23 are adhered to each other to form the upper end closed side 22. At this time, the right side 24 may have the inner surfaces of the bottom film 3 in a non-adhered state, or may have the inner surfaces of the bottom film 3 in a bonded state.

The bottom film 3 obtained in FIG. 10(b) is inserted into the lower end of the sheet-shaped body film 2 folded in half as shown in FIG. 11(a) (first step). At this time, in the portion where the lower end 16a of the vertical seal 16 is formed, a right side 24 made of the two stacked bottom films 3 is formed between the inner surfaces of the two stacked body films 2. It is considered to be stuck. Further, in FIG. 11(a), as an example, the edge of the bottom film 3 on the open side 21 side is arranged so as to extend outward from the lower edge of the body film 2, but the present invention is not limited to this. The edge on the open side 21 side may be arranged inside the lower edge of the body film 2 (not shown), or the edge on the open side 21 side may be arranged to match the lower edge of the body film 2 ( (not shown). Next, as shown in FIG. 11(b), a vertical seal 16 is formed (second step). The vertical seal is preferably formed by heat sealing, and the forming method thereof is not particularly limited, but may be, for example, heat sealing, ultrasonic sealing, high frequency sealing, spot sealing, impulse sealer, or laser bonding. At this time, at the lower end 16a of the vertical seal 16, there are a thermally bonded portion between the inner surface of the body film 2 and the bottom film 3, a thermally bonded portion between the bottom films 3, and an inner surface of the bottom film 3 and the body film 2. A thermally bonded portion with the surface is formed, and the two body films 2 and the two bottom films 3 are thermally bonded together. In a portion other than the lower end 16a of the vertical seal 16, the inner surfaces of the two body films are thermally bonded to each other. Next, as shown in FIG. 11(c), if there are various bottom seals 30 (31, 34, 35) and a gap 40, a gap seal portion 50 is formed, and the lower end 11 of the body 10 is closed ( Third step). The various bottom seals 30 (31, 34, 35) and gap seal portions 50 may be formed all at the same time, or may be formed one after another. In the step of FIG. 11(a), when the edge of the bottom film 3 on the open side 21 side is arranged so as to extend outward from the lower edge of the body film 2, as shown in FIG. 11(d), The lower end seal portion 31 and the gap seal portion 50 formed in step c) are cut at appropriate positions, for example, at the position of the dashed line L (shown in FIG. 11(c)) (fourth step). As a result, the lower end of the trunk film 2 and the open side 21 of the bottom film 3 are aligned, and the matched lower end of the trunk film 2 and the open side 21 of the bottom film 3 are bonded over the entire circumference. The adhesive part between the lower end of the highly rigid body film 2 and the open side 21 of the bottom film 3 is installed on the ground surface of the self-supporting bag 1, and the self-supporting bag 1 can stably stand on its own. Can be done.

Up to this point, the self-supporting bag 1 according to the present embodiment has been described using specific examples, but the present invention is not interpreted as being limited to these descriptions. The embodiments may be modified in various ways as long as the effects of the present invention are achieved.

For example, in the self-standing bag 1A of the first example shown in FIG. 1, a locking hole 17 may be provided in the vertical seal 16 to enable the vertical seal 16 to be hung as shown in FIG. As shown in FIG. 5, the vertical seal 16 may be provided with a locking hole 17 to enable hanging, or as shown in FIGS. 6 and 7, the vertical seal 16 may be folded back along the outer surface of the body 10. It may also be modified to be fixed to the outer surface of the trunk 10 in a deformed state.

In the second example of the self-standing bag 1B and the third example of the self-standing bag 1C shown in FIGS. 3 to 6, the bottom gusset 20 doubles one sheet-like bottom film 3 (3C), as shown in FIG. An example has been shown in which the folded fold is the upper end closed side 22, and the portions closed by adhering the inner surfaces of the bottom film 3 to each other at both edges extending from both ends of the fold are the left side 23 and the right side 24. , modifications as shown in FIGS. 13 to 16 may be made.

As shown in FIG. 13, the bottom film 3 (3A) is a tubular film with no seam in the circumferential direction and has a cylindrical shape with both ends open, and the open side 21 is the cylindrical shape of the bottom film 3 (3A). The bottom films 3 (3A) facing each other at one end of the bottom film 3 (3A) are in a non-adhered state, and the upper end closed side 22 is the bottom film 3 (3A) facing each other at the other end of the cylindrical shape of the bottom film 3 (3A). (3A) is a portion closed by adhering the bottom film 3 (3A) to each other, and the left side 23 and right side 24 are preferably folds formed by flattening the cylindrical shape of the bottom film 3 (3A). A circumferentially seamless tubular film as shown in FIG. 13 can be formed, for example, by inflation molding. The bottom film 3 (3A) can be manufactured through a simple process of preparing a roll of cylindrical film in advance and then heat-sealing and slitting it at predetermined intervals while unwinding the film, reducing manufacturing costs. Can be suppressed.

Further, as shown in FIG. 14, the bottom film 3 (3B) is a sheet-like film, and the sheet-like film is attached to the back to form a cylinder shape. The bottom films 3 (3B) facing each other at the other end of the shape are glued together to form the upper end closed side 22, and the fold formed by flattening the cylindrical shape of the bottom film 3 (3B) is the left side 23 and the right side. It may be set to 24.

As shown in FIG. 15, the bottom film 3 (3D) is two sheet-like films, and the two sheet-like films are overlapped and one edge of the periphery is used to touch the inner surfaces of the sheet-like films. The non-adhered portion is an open side 21, and the inner surfaces of the sheet-like film are adhered and closed with the remaining edges of the periphery to form an upper closed side 22, a left side 23, and a right side 24, respectively. There may be.

The bottom film 3 (3E) is a sheet-like film, and the fold made by folding the sheet-like film in half is either the left side 23 or the right side 24 (right side 24 in FIG. 7). , the inner surfaces of the bottom film are glued together at the edges opposite the folds, and the closed portion is defined as the other of the left side 23 or the right side 24 (the left side 23 in FIG. 7), and the edge extending from one end of the fold is used as the sheet. The upper end closed side 22 is the part where the inner surfaces of the sheet-like film are glued together, and the open side 21 is the part where the inner surfaces of the sheet-like film are not glued together at the edge extending from the other end of the fold. There may be.

In the self-standing bag 1D of the fourth example shown in FIGS. 8 and 9, the bottom gusset 20 may be modified to be formed of the bottom film 3 shown in FIGS. 12 to 16.

1 (1A, 1B, 1C, 1D) Self-supporting bag 2 Body film 3 (3A, 3B, 3C, 3D, 3E) Bottom film 3a 1st surface 3b 2nd surface 10 Body 11 Lower end 12 Upper end 13 Left edge 14 Right side Edge 15 Accommodation space 16 Vertical seal 16a Lower end of vertical seal 17 Locking hole 20 Bottom gusset 21 Open side 22 Upper end closed side 23 Left side 24 Right side 28 Notch 30 Bottom seal 31 Lower end seal part 32 Left side seal part 33 Right side seal Part 34 Left side inclined seal part 35 Right side inclined seal part 40 Gap 50 Gap seal part 51 Left side gap seal part 52 Right side gap seal part 53 Left side connected seal part 54 Right side connected seal part 60 Non-adhesive part 201 Base layer 202 Sealant layer

Claims (5)

A laminate film having at least a base layer and a sealant layer is used as a body film, and a vertical seal is provided with the sealant layer inside to form a cylinder shape with open upper and lower ends, and the cylinder shape is flattened to form a left edge and a right side. A torso with a rim;
an open side, a top closed side opposite to the open side, a left side connecting the left side of the open side and the left side of the top closed side, and a right side of the open side and a right side of the top closed side. and a bottom gusset having a bottom film inserted into the lower end of the body with the open side facing downward,
The trunk film and the bottom film are fixed with a bottom seal,
The bottom seal has at least a lower end seal portion in which a lower end of the bottom film and a lower end of the trunk film are bonded to each other, and
The bottom film is a laminate film having at least a base layer and a sealant layer,
The upper end closed side is a crease where the bottom film is folded in half with the base layer inside,
The bottom seal includes a left side seal portion in which a region of a predetermined width from the left side of the bottom film and the inner surface of the trunk film are adhered, and a region of a predetermined width from the right side of the bottom film and the trunk. further comprising a right side seal portion to which the inner surface of the film is adhered;
The self-supporting bag has a gap between the inner wall at the left edge of the trunk and the left side of the bottom film, and between the inner wall at the right edge of the trunk and the right side of the bottom film. and a left-side gap seal portion in which the inner surfaces of the body film are bonded to each other throughout the gap on the left side edge side, and the inner surfaces of the body film are bonded to each other in the entire area of the gap on the right side edge side. The bonded right side gap seal portion, the left side connecting seal portion that is connected above the left side seal portion and the left side gap seal portion and has the inner surfaces of the body film adhered to each other, and the right side seal portion and the right side gap. A self-supporting bag characterized by further comprising: a right side connecting seal section connected above the seal section and having the inner surfaces of the body film adhered to each other . The self-supporting bag according to claim 1 , wherein the vertical seal is disposed between the left side edge and the right side edge. The self-supporting bag according to claim 1 , wherein the vertical seal is arranged on the left side edge or the right side edge. The self-supporting bag according to claim 3 , wherein the vertical seal is fixed to the outer surface of the body while being folded back along the outer surface of the body. 4. The self-supporting bag according to claim 3 , wherein the vertical seal is free from the outer surface of the body and has a locking hole for suspending the self-supporting bag.

Images