Stand Up Pouch

Abstract

To provide a self-standing bag which imparts no unpleasant feeling to a hand when the hand grips a trunk part, and which prevents distortion or constriction from occurring at the trunk part.SOLUTION: In a self-standing bag 1, a lower end of a trunk part film 2 and a lower end of a bottom part film 3 facing each other are joined, and a portion joined therewith includes: side adhesion parts 51, 52 for connecting both end parts of a folding part 21 and both end parts of an opposing part 22 respectively; and a lower end adhesion part 53 for connecting lower ends of the side adhesion parts. The self-standing bag includes: extension adhesion parts 54, 55 in which inner surfaces of the trunk part film 2 are caused to adhere to each other; and connected adhesion parts 56, 57 connected to the extension adhesion parts. The connected adhesion parts are regions surrounded by points A which are intersections of bag inside boundary lines 54a, 55a of the extension adhesion parts and left / right side end edge, respectively, points B which are points on the left / right-side-end edges and which are above the points A, respectively, and points C which are intersections of bag inside boundary lines 51a, 52a of the side adhesion parts and the folding parts, respectively, and which are portions in which the inner surfaces of the trunk part film 2 are adhered.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a freestanding bag. [Background technology]

[0002] Conventionally, there are known self-supporting bags such as standing pouches that have a body and a bottom, and the bottom is formed in a gusseted format (see, for example, Patent Document 1). In self-supporting bags such as those in Patent Document 1, side seals are applied to the left and right edges. Because these side seals are very rigid, there are problems with the feel of use, such as consumers feeling pain in their hands when the side seals hit them when they hold the bag in their hands.

[0003] Therefore, a self-supporting bag without a side seal has been proposed in which the side end of the bottom member is attached to the inner surface of the body portion by an adhesive member that bonds the side end of the bottom member to the body portion so as to cover the side end of the bottom member (see, for example, Patent Documents 2 and 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-191200 A [Patent Document 2] JP 2011-195175 A [Patent Document 3] JP 2019-6435 A Summary of the Invention [Problem to be solved by the invention]

[0005] The self-supporting bags described in Patent Documents 2 and 3 can be mass-produced at low cost by inserting a gusseted bottom into a tubular film. However, in addition to the lack of a side seal, they are made of soft packaging material, so when the contents are liquid or heavy, the weight of the contents can cause distortion or constriction near the bottom of the body, making the self-supporting bag unstable and making the product look unattractive when displayed.

[0006] To provide a self-supporting bag which can be mass-produced inexpensively while being environmentally friendly, causes no discomfort when gripped in the hand at the body portion, and prevents distortion or narrowing of the body portion. [Means for solving the problem]

[0007] The inventors found that the above-mentioned problems could be solved by providing a connecting adhesive portion, and completed the present invention. That is, the self-supporting bag according to the present invention comprises a body portion having a flattened body film with a cylindrical shape with upper and lower ends open and creases on the left and right side edges, and a bottom film having a folded-in part and an opposing part opposing the folded-in part, inserted into the lower end of the body portion with the folded-in part on the upper side, the bottom film being tapered in shape when folded in half, the width of which decreases from the folded-in part toward the opposing part, the lower end of the body film being shaped to fit the periphery of the inserted bottom film, the lower end of the body film facing each other being joined, and the joined bottom film is formed in a shape that is different from the shape of the bottom film. the folded portion includes side edge adhesive portions connecting both ends of the folded portion and both ends of the opposing portion, and a bottom end adhesive portion connecting the bottom ends of the side edge adhesive portions, and the self-supporting bag has an extended adhesive portion where the side edge adhesive portions are extended until they reach the left and right side edges to bond the inner surfaces of the body film to each other, and a connecting adhesive portion connected to the extended adhesive portion, and the connecting adhesive portion is a portion where the inner surfaces of the body film are bonded to each other in an area surrounded by Point A, which is the intersection of the bag inner boundary line of the extended adhesive portion and the left and right side edges, Point B, which is a point on the left and right side edges and is above Point A, and Point C, which is the intersection of the bag inner boundary line of the side edge adhesive portion and the folded portion.

[0008] In the self-standing bag according to the present invention, when the distance between point D, which is the intersection point between the inner boundary line of the bottom edge adhesive part and the inner boundary line of the side edge adhesive part, and point A is K1 and the distance between point A and point B is K2, it is preferable that K2 is 0.5K1 or more and 1.5K1 or less, thereby making it possible to more reliably suppress distortion or necking of the body part.

[0009] In the self-supporting bag according to the present invention, when the distance between the point A and the point B is K2 and the total length of the left and right side edges is L1, it is preferable that the distance K2 is 0.05L1 or more and 0.50L1 or less. Since the extended adhesive portion does not reach the gripping portion of the body, there is no discomfort when the body is gripped with the hand.

[0010] In the self-supporting bag according to the present invention, it is preferable that the angle between the inner boundary line of the side edge adhesive portion and an imaginary extension line of the inner boundary line of the bottom end adhesive portion extending outward is between 20° and 70°, which makes the self-supporting bag more stable.

[0011] In the self-supporting bag according to the present invention, it is preferable that the body portion has a thick portion extending in the up-down direction of the body portion. This makes the self-supporting bag more stable.

[0012] In the self-supporting bag according to the present invention, it is preferable that the inner boundary line of the adhesive portion connecting point B and point C among the connected adhesive portions has a shape that is convex toward the inside of the bag, which can more reliably suppress distortion or narrowing of the body portion.

[0013] In the self-supporting bag according to the present invention, the upper end of the body portion includes a form having a spout, a fitting, or a sealing seal. Effect of the Invention

[0014] According to the present disclosure, a self-supporting bag can be provided that can be mass-produced inexpensively while being environmentally friendly, causes no discomfort when gripping the body portion in the hand, and prevents distortion or narrowing of the body portion. [Brief description of the drawings]

[0015] [Figure 1]FIG. 2 is a front view showing an example of a self-standing bag according to the present embodiment. [Diagram 2] 2 is a cross-sectional view taken along line XX in FIG. 1. [Diagram 3] 13 is a partial front view showing a modified example of the lower end portion of the self-standing bag according to the embodiment. FIG. [Figure 4] FIG. 13 is a front view showing an example of a free-standing bag that does not have a connecting adhesive portion. [Diagram 5] 2 shows the state of the body part near the bottom part of the self-supporting bag 1 of Example 1. [Figure 6] 1 shows the state of the body part near the bottom of a self-supporting bag 900 of Comparative Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Next, the present invention will be described in detail with reference to the embodiments, but the present invention is not limited to these descriptions. Various modifications of the embodiments may be made as long as the effects of the present invention are achieved.

[0017] Fig. 1 is a front view showing an example of a self-supporting bag according to the present embodiment. Fig. 2 is a cross-sectional view taken along line XX in Fig. 1. The self-supporting bag 1 according to the present embodiment includes a body portion 10 having a flattened body film 2 in a cylindrical shape with upper and lower ends open, and creases at left and right side edges 14, 15, and a bottom film 3 having a folded-in-two fold portion 21 and an opposing portion 22 opposing the folded-in-two fold portion 21, which is inserted into the lower end of the body portion 10 with the folded-in-two fold portion 21 on the upper side. In this self-supporting bag, the bottom film 3 is folded in two and has a tapered shape that becomes narrower from the folded-in-two fold portion 21 toward the opposing portion 22, and the lower end of the body film 2 is shaped to fit the periphery of the inserted bottom film 3, and the lower end of the body film 2 and the lower end of the bottom film 3, which face each other, are joined, and the joined portion faces both ends of the folded-in-two fold portion 21. and a bottom adhesive portion 53 connecting the bottom ends of the side adhesive portions 51, 52 to the bottom ends of the folded-back portion 21. The self-supporting bag 1 has extended adhesive portions 54, 55 formed by extending the side adhesive portions 51, 52 until they reach the left and right side edges 14, 15 to bond the inner surfaces of the body film 2 together, and connecting adhesive portions 56, 57 connected to the extended adhesive portions 54, 55. The connecting adhesive portions 56, 57 are portions where the inner surfaces of the body film 2 are bonded together in an area surrounded by point A, which is the intersection of the bag inner boundary lines 54a, 55a of the extended adhesive portions 54, 55 and the left and right side edges 14, 15, point B, which is a point on the left and right side edges 14, 15 and is above point A, and point C, which is the intersection of the bag inner boundary lines 51a, 52a of the side adhesive portions 51, 52 and the folded-back portion 21.

[0018] The self-supporting bag 1 has a body 10 and a bottom 20, and the bottom 20 is gusseted to provide self-supporting properties. The self-supporting bag 1 has a storage chamber 13 for contents inside, as shown in Fig. 2. Fig. 1 is a diagram showing the self-supporting bag 1 in a flat state with no contents stored in the storage chamber 13, but by storing contents in the storage chamber 13, the bottom 20 folded in half opens up in a gusset shape, allowing the self-supporting bag 1 to stably stand on its own.

[0019] As shown in Figs. 1 and 2, the body 10 has a front portion 11 and a rear portion 12, and is flat when no contents are contained. The front portion 11 and the rear portion 12 are connected via folds at the left and right side edges 14, 15. The flat shape refers to a state in which the inner wall surface of the front portion 11 and the inner wall surface of the rear portion 12 are close to each other when no contents are contained in the self-standing bag 1, and the cross-sectional shape of the self-standing bag 1 is elongated. A typical self-standing bag has side seals at the left and right side edges by bonding the inner surfaces of the body films to each other, but the self-standing bag 1 according to this embodiment has folds rather than side seals at the left and right side edges 14, 15. Therefore, even if the body 10 is held in the hand, the side seals do not come into contact with the hand, so there is no discomfort.

[0020] The body 10 is made of a body film 2. The body film 2 is preferably an inflation film as shown in FIG. 1 and FIG. 2. Since the inflation film is cylindrical, the body 10 can be made seamless by heat sealing or the like. Alternatively, the body film 2 may be a single film, and the body 10 may be made cylindrical by back-pasting. For example, the body 10 may be made cylindrical by butting both ends of a single film together without any gaps, and heat-sealing the back by forming an adhesive film (not shown) on the inner side of the film, or by bonding the inner surface of one side end of a single film to the outer surface of the other side end of the single film together in an envelope-like form, or by bonding the inner surfaces of both side ends of a single film together in a palm-to-palm form. The envelope-like form or palm-to-palm form may be performed by heat sealing or by using an adhesive. The material of the body film 2 may be any of the following: <1> ~ <29> Any of the above may be used, but is not particularly limited in this embodiment. Of these, the material of the body film 2 is preferably, for example, a polyethylene resin or a polypropylene resin. The body film 2 may include a porous base material such as paper. <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> Polyethersulfone (PES) <23> Amorphous Polyarylate (PAR) <24> Liquid Crystal Polymer (LCP) <25> Polyetheretherketone (PEEK) <26> Thermoplastic Polyimide (PI) <27> Polyamide-imide (PAI) <28> Thermoplastic Polyurethane (TPU) <29> Fluorine resin (PTFE) Furthermore, the body film 2 may be a single layer film or a laminate film. When the body film 2 is a single layer film, its thickness is preferably about 0.2 to 1.5 mm. When the body film 2 is a laminate film, its thickness is preferably about 0.4 to 2.0 mm.

[0021] The bottom portion 20 closes the lower end of the body portion 10. When there is no content in the storage chamber 13, the bottom portion 20 is folded inside the body portion 10, and the self-standing bag 1 is generally flattened. When the storage chamber 13 is filled with content, the bottom portion 20 unfolds and the self-standing bag 1 can stably stand on its own. The folded portion 21 is the crease where the bottom portion 20 is folded in half. The facing portion 22 is the lowermost portion of the bottom portion 20. The folded shape of the bottom film 3 is a tapered shape whose width decreases from the folded portion 21 toward the facing portion 22. The tapered shape may be an inverted trapezoid shape as shown in FIG. 1, or may be, for example, a semicircular shape (not shown) or a semi-elliptical shape (not shown). When the folded shape of the bottom film 3 is, for example, an inverted trapezoid (shown in FIG. 1), the folded portion 21 is the lower base (longer base) of the trapezoid, and the facing portion 22 is the upper base (shorter base) of the trapezoid. When the folded shape of the bottom film 3 is, for example, a semicircular shape (not shown), the folded portion 21 is a chord passing through the center of the circle, and the facing portion 22 is the arc obtained by dividing a semicircular arc into n equal parts (where n is an odd number equal to or greater than 3) that is the farthest from the folded portion 21. When the folded shape of the bottom film 3 is, for example, a semi-elliptical shape (not shown), the folded portion 21 is the long or short axis of the ellipse, and the facing portion 22 is the arc obtained by dividing an elliptical arc into n equal parts (where n is an odd number equal to or greater than 3) that is the farthest from the folded portion 21.

[0022] The material of the bottom film 3 can be the same as those listed as the materials of the body film 2. The material of the bottom film 3 may be the same as or different from the material of the body film 2.

[0023] The joint between the lower end of the body film 2 and the lower end of the bottom film 3 has side adhesive parts 51, 52 and a bottom adhesive part 53. In this specification, each adhesive part is preferably a thermal adhesive part such as a heat seal. The self-standing bag 1 according to this embodiment can be mass-produced inexpensively and environmentally friendly by inserting the gusseted bottom part 20 into the cylindrical body part 10.

[0024] The extended adhesive parts 54, 55 are adhesive parts between the inner wall surface of the front part 11 and the inner wall surface of the rear part 12 in the area surrounded by lines obtained by extending the bag inside boundary lines 51a, 52a of the side adhesive parts 51, 52 until they reach the left and right side edges 14, 15, the left and right side edges 14, 15, and the upper ends (lines on the folded-back parts 21) of the side adhesive parts 51, 52. When the bag inside boundary lines 51a, 52a of the side adhesive parts 51, 52 are straight, the bag inside boundary lines 54a, 55a of the extended adhesive parts 54, 55 are extension lines of the bag inside boundary lines 51a, 52a of the side adhesive parts 51, 52. When the bag inside boundary lines 51a, 52a of the side edge adhesive parts 51, 52 are curved, the bag inside boundary lines 54a, 55a of the extended adhesive parts 54, 55 are preferably tangents to the end points (points C) on the folded-back parts 21 of the bag inside boundary lines 51a, 52a of the side edge adhesive parts 51, 52. In this specification, the bag inside boundary line refers to the boundary line on the storage chamber 13 side of the adhesive parts.

[0025] The connecting adhesive parts 56, 57 are adhesive parts between the inner wall surface of the front part 11 and the inner wall surface of the rear part 12 in the area surrounded by points A, B, and C. Point A is the intersection point between the bag inside boundary lines 54a, 55a of the extended adhesive parts 54, 55 and the left and right side edges 14, 15. Point B is a point on the left and right side edges 14, 15 and is above point A. Point C is the intersection point between the bag inside boundary lines 51a, 52a of the side adhesive parts 51, 52 and the folded-back part 21. Point C can also be said to be the end point on the folded-back part 21 of the bag inside boundary lines 51a, 52a of the side adhesive parts 51, 52, or the end point on the folded-back part 21 of the bag inside boundary lines 54a, 55a of the extended adhesive parts 54, 55.

[0026] In FIG. 1, as an example, the bag inner boundary line 56a, 57a of the adhesive part connecting point B and point C of the connected adhesive parts 56, 57 is shown as a straight line, but this embodiment is not limited to this. FIG. 3 is a partial front view showing a modified example of the lower end part of the self-supporting bag according to this embodiment. In the self-supporting bag 1 according to this embodiment, the bag inner boundary line 56a, 57a of the adhesive part connecting point B and point C of the connected adhesive parts 56, 57 is preferably in a convex shape toward the inside of the bag as shown in FIG. The convex shape may be, for example, a curved line shape, a dogleg shape, or an inverted dogleg shape. This makes it possible to more reliably suppress distortion or narrowing of the body part.

[0027] Fig. 4 is a front view showing an example of a self-supporting bag without a connecting adhesive part. A self-supporting bag 900 without connecting adhesive parts 56, 57 (shown in Fig. 1) includes a body part 910 in which a body film having a cylindrical shape with an open upper end and lower end is flattened and has creases at left and right side edges 914, 915, and a bottom part 920 in which a bottom film having a folded part folded in two is inserted into the lower end part of the body part 910 with the folded part facing up. When the bottom film is inserted into the cylindrical body film, the width of the bottom film may be made smaller than the width of the body film so that the bottom film can be inserted into the body film more reliably. A gap M between the left and right side edges 914, 915 of the body part and the left and right side edges of the bottom film is about 1 to 5 mm. A bottom seal is provided to close this gap M, but the inventor has found that when the self-standing bag 900 is filled with contents and the bottom 920 opens, stress is applied to each of points S, T, U, and V shown in Fig. 4, causing distortion or warping in the body 910 near the bottom 920. The inventor has therefore found that the distortion or warping occurring in the body 910 can be eliminated by providing a connecting adhesive part, and has completed the present invention.

[0028] 1 and 3, for convenience of explanation, the hatching of the side adhesive parts 51, 52 and the bottom end adhesive part 53 is different from the hatching of the connecting adhesive parts 56, 57, and the hatching of the extended adhesive parts 54, 55, but the side adhesive parts 51, 52 and the extended adhesive parts 54, 55 are connected and integrated at the folded part 21, and the extended adhesive parts 54, 55 and the connecting adhesive parts 56, 57 are connected and integrated in a straight line or curve connecting points A and C. By providing the connecting adhesive parts 56, 57, the stress applied to points S, T, U, and V shown in Fig. 4 is dispersed to points A, B, C, and D shown in Fig. 1, respectively, so that the body part 10 can be prevented from being distorted or constricted even when the self-standing bag 1 is filled with contents.

[0029] In the self-standing bag 1 according to the present embodiment, as shown in FIG. 1, when the distance between point D and point A, which are the intersection points of the bag inner boundary line 53a of the bottom end adhesive part 53 and the bag inner boundary lines 51a, 52a of the side edge adhesive parts 51, 52, is K1, and the distance between point A and point B is K2, K2 is preferably 0.5K1 or more and 1.5K1 or less. By setting K2 relative to K1 in such a range, it is possible to more reliably suppress distortion or necking of the body part. It is more preferable that K2 is 0.7K1 or more and 1.3K1 or less, and further more preferable that it is 0.8K1 or more and 1.2K1 or less. It is particularly preferable that K2 is equal to K1. In this embodiment, a triangle with vertices at points A, B, and D becomes an isosceles triangle, and it is possible to more reliably suppress distortion or necking of the body part and to obtain a self-standing bag with excellent aesthetics.

[0030] In the self-supporting bag 1 according to this embodiment, as shown in Fig. 1, when the distance between points A and B is K2 and the total length of the left and right side edges 14, 15 is L1, it is preferable that K2 is 0.05L1 or more and 0.50L1 or less. By setting K2 relative to L1 in this range, the connecting adhesive parts 56, 57 do not extend to the grippable part of the body part 10, so that there is no discomfort when the body part 10 is gripped by hand. K2 is more preferably 0.10L1 or more and 0.30L1 or less, and even more preferably 0.15L1 or more and 0.20D1 or less.

[0031] In the self-supporting bag 1 according to this embodiment, as shown in Fig. 1, the angle θ between the bag inner boundary lines 51a, 52a of the side edge adhesive parts 51, 52 and an imaginary extension line extending outward from the bag inner boundary line 53a of the bottom end adhesive part 53 is preferably 20° or more and 70° or less. By setting θ in this range, the self-supporting bag 1 becomes more stable. θ is more preferably 40° or more and 60° or less, and even more preferably 45°.

[0032] In the self-supporting bag 1 according to the present embodiment, as shown in FIG. 1, the body 10 preferably has a thick portion 16 extending in the vertical direction of the body 10. By providing the thick portion 16, the rigidity of the body 10 is increased, and the self-supporting stability and shape retention are further improved. The thick portion 16 is preferably not provided on the left and right side edges 14, 15, but is provided on the front portion 11 and the rear portion 12. The thick portion 16 may be integral with the body film 2 (shown in FIG. 2) or may be separate from the body film 2 (not shown). The thick portion 16 may be, for example, a protruding rib or a male or female member of a fitting. The number of thick portions 16 is not particularly limited, but is preferably 2 to 10.

[0033] In the self-supporting bag 1 according to the present embodiment, the upper end of the body 10 includes a form having a spout 30 as shown in FIG. 1. By providing the spout 30 at the upper end of the body 10, the self-supporting bag 1 can be used as a substitute for a plastic bottle. For example, from the viewpoint of environmental conservation, many municipalities require that the cap and the printed shrink label of a plastic bottle be separated from the bottle body before disposal. It takes time for consumers to dispose of the bottle, and there is a risk of injuring their nails or fingers when peeling off the shrink label. The self-supporting bag 1 according to the present embodiment can be printed directly on the body 10, so there is no need to separate the label when disposing of the bag, and the bag can be disposed of without separating it from the spout 30. This not only makes it easier to dispose of the bag as household waste, but also contributes to reducing the work time, disposal costs, and labor costs at restaurants. The self-supporting bag 1 uses less resin than a plastic bottle, so it can be crushed into small pieces after use, which allows for a dramatic reduction in the amount of waste. In addition, the self-supporting bag 1 can be washed after use and reused like a plastic bottle, reducing the burden on the environment. Since the self-supporting bag 1 can be manufactured more cheaply than a plastic bottle, the economic effect is immeasurable.

[0034] In the self-standing bag 1 according to this embodiment, the upper end of the body portion 10 may have a fitting (not shown) or a sealing seal (not shown). The fitting is, for example, a female-male interlocking zipper having a male member and a female member. The sealing seal is a portion at the upper end of the body portion 10 where the inner wall surface of the front portion 11 and the inner wall surface of the rear portion 12 are bonded together.

[0035] The total length L1 of the left and right side edges 14, 15 is not particularly limited, but is preferably, for example, 80 to 200 mm. The height L2 from the facing portion 22 of the bottom portion 20 to the folded-back portion 21 is not particularly limited, but is preferably, for example, 10 to 50 mm. The width between the left and right side edges 14, 15 is not particularly limited, but is preferably, for example, 50 to 200 mm, and more preferably 70 to 150 mm. EXAMPLES

[0036] Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

[0037] Example 1 A self-supporting bag 1 as shown in FIG. 1 was produced. However, thick portion 16 was not provided. Both body film 2 and bottom film 3 were inflation films, and their material was polyethylene (thickness: 0.4 mm). The external dimensions were L1 150 mm, L2 20 mm, L3 100 mm, and θ 45°. 300 ml of water was filled as the content, and the bag was sealed with spout 30. In this self-supporting bag 1, K1 was 30 mm, and K2 was 30 mm.

[0038] Comparative Example 1 A self-supporting bag 900 shown in Fig. 4 was produced. The material, outer dimensions, contents, and content volume were the same as those of the self-supporting bag 1 in Example 1.

[0039] The state of the body near the bottom of the self-supporting bag 1 of Example 1 and the self-supporting bag 900 of Comparative Example 1 was visually confirmed. Fig. 5 shows the state of the body near the bottom of the self-supporting bag 1 of Example 1. Fig. 6 shows the state of the body near the bottom of the self-supporting bag 900 of Comparative Example 1. As shown in Fig. 6, the self-supporting bag 900 of Comparative Example 1 had constrictions and distortions near the bottom of the body, whereas as shown in Fig. 5, the self-supporting bag 1 of Example 1 had no constrictions or distortions near the bottom of the body due to the presence of connecting adhesive parts 56, 57. [Explanation of symbols]

[0040] 1 freestanding bag 2. Body Film 3 Bottom Film 10. Torso 11 Front part 12 Rear part 13 Containment Room 14,15 Left and right side edges 16 Thick wall part 20 bottom 21 Folding part 22 Opposing part 30 Spout 51,52 Side adhesive part 51a, 52a Inside boundary line of side adhesive part 53 Lower end adhesive part 53a Bottom adhesive part bag inner boundary line 54,55 Extension adhesive part 54a, 55a Inside boundary line of extended adhesive part 56,57 Joint adhesive part 56a, 57a Bag inner boundary line of joint adhesive part 900 freestanding bag 914,915 Left and right side edges 910 Torso 920 bottom

Claims

1. A body portion having a cylindrical shape with an open upper end and a closed lower end, the body portion being flattened and having folds on the left and right side edges; A self-supporting bag comprising: a bottom film having a folded portion and an opposing portion opposing the folded portion; and a bottom portion inserted into a lower end portion of the body portion with the folded portion facing upward, The bottom film is folded in half to form a tapered shape in which the width decreases from the folded portion toward the facing portion, The lower end of the body film is shaped to fit the periphery of the inserted bottom film, The lower end of the body film and the lower end of the bottom film facing each other are joined together, The joined portion includes side edge adhesive portions that respectively connect both ends of the folded portion and both ends of the facing portion, and a bottom edge adhesive portion that connects bottom ends of the side edge adhesive portions, The self-supporting bag has an extended adhesive portion that extends the side edge adhesive portion until it reaches the left and right side edges to bond the inner surfaces of the body film together, and a connecting adhesive portion that connects to the extended adhesive portion, The connected adhesive portion is a portion where the inner surfaces of the body film are adhered to each other in an area surrounded by point A, which is the intersection of the bag inner boundary line of the extended adhesive portion and the left and right side edges, point B, which is a point on the left and right side edges and is above point A, and point C, which is the intersection of the bag inner boundary line of the side edge adhesive portion and the folded-back portion.

2. When the distance between point D, which is the intersection point of the inner boundary line of the bottom end adhesive portion and the inner boundary line of the side edge adhesive portion, and point A is K1, and the distance between point A and point B is K2, 2. The self-supporting bag according to claim 1, wherein K2 is equal to or greater than 0.5K1 and equal to or less than 1.5K1.

3. When the distance between point A and point B is K2 and the total length of the left and right side edges is L1, 3. The self-supporting bag according to claim 1, wherein K2 is equal to or greater than 0.05L1 and equal to or less than 0.50L1.

4. The self-supporting bag according to any one of claims 1 to 3, characterized in that an angle between the bag inner boundary line of the side edge adhesive portion and an imaginary extension line extending outward from the bag inner boundary line of the bottom end adhesive portion is greater than or equal to 20° and less than or equal to 70°.

5. 5. The self-supporting bag according to claim 1, wherein the body portion has a thick portion extending in a vertical direction of the body portion.

6. 6. The self-supporting bag according to claim 1, wherein an inner boundary line of the adhesive portion connecting point B and point C among the connecting adhesive portions has a convex shape toward the inside of the bag.

7. 7. The self-supporting bag according to claim 1, wherein the upper end of the body portion has a spout, a fitting or a sealing seal.

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