Standing pouch

Abstract

To provide a standing pouch improved in durability against falling.SOLUTION: At the side end of a first stacking region in which a front wall 101, a rear wall, and a bottom gusset part 103 are staked at the lower end of a standing pouch 1A, first to third main junction regions 211a1-211a3 in which the front wall 101 and a front wall side gusset part are joined and a rear wall side gusset part and the rear wall are joined, and first and second sub-junction regions 211b1 and 211b2 in which the front wall 101 and the rear wall are joined are positioned. The following equations (1)-(6) are satisfied, A1<D1 (1), A1<E1 (2), B1<D1 (3), B1<E1(4), A1<C1(5), and B1<C1(6), in which A1-E1 represent the lengths of the first to third main junction regions 211a1-211a3 and the first and second sub-junction regions 211b1 and 211b2 in the height direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a standing pouch provided with a bottom gusset. [Background technology]

[0002] Conventionally, so-called standing pouches have been widely used, which have an internal storage space formed by joining a pair of opposing sheet-like members and a sheet-like member folded in half so as to be interposed between the pair of sheet-like members. In this standing pouch, when the storage space is filled with contents, the bottom gusset defined mainly by the folded sheet-like members is pushed open, thereby enabling the standing pouch to stand on its own. For example, Japanese Patent Application Laid-Open No. 2017-114519 (Patent Document 1) discloses this type of standing pouch. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-114519 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, in a stand-up pouch, the bottom gusset is formed by joining multiple sheet-like members together at predetermined locations, and if the stand-up pouch is dropped, a load is concentrated on a portion of the joined portions, making the pouch prone to tearing from that portion. Furthermore, in recent years, there has been a growing need for larger stand-up pouches, and if the amount of content increases, the load also increases, further increasing the risk of the pouch tearing. Therefore, some kind of solution to the above problem is required for stand-up pouches so that they do not easily tear even if dropped.

[0005] Therefore, the present invention has been made in consideration of the above points, and an object of the present invention is to provide a standing pouch with improved durability against dropping. [Means for solving the problem]

[0006] A stand-up pouch according to the present invention has first and second side edges positioned opposite each other in the width direction and upper and lower edges positioned opposite each other in the height direction, and has an internal storage space for storing contents. The stand-up pouch according to the present invention also includes a front wall, a rear wall, and a bottom gusset that define the storage space. The lower edge has a first overlapping region formed by overlapping the front wall, the rear wall, and the bottom gusset when no contents are contained in the storage space. The rest of the pouch except for the lower edge has a second overlapping region formed by overlapping the front wall and the rear wall when no contents are contained in the storage space. The bottom gusset is folded in half to include a front wall gusset located on the front wall side and a rear wall gusset located on the rear wall side, and is positioned between the front wall and the rear wall with the fold located on the upper edge side. A lower end of the front wall crotch portion is connected to a lower end of the front wall, and a lower end of the rear wall crotch portion is connected to a lower end of the rear wall. In a portion of the first overlapping region corresponding to the first side end, the front wall, the front wall crotch portion, the rear wall crotch portion, and the rear wall are overlapped in this order, and the front wall and the front wall crotch portion are joined to each other and the rear wall crotch portion and the rear wall are joined to each other, thereby providing a first main bonding region, a second main bonding region, and a third main bonding region that are spaced apart from each other in the height direction. In addition, in the portion of the first overlapping region corresponding to the first side end, a first cut-out portion and a second cut-out portion positioned at a distance from each other in the height direction are provided in both the front wall portion side crotch portion and the rear wall portion side crotch portion, thereby forming a first sub-bonding region formed by directly joining the front wall portion and the rear wall portion in the portion corresponding to the first cut-out portion, and a second sub-bonding region formed by directly joining the front wall portion and the rear wall portion in the portion corresponding to the second cut-out portion.The first main bonding region, the first sub-bonding region, the second main bonding region, the second sub-bonding region, and the third main bonding region are adjacently arranged in this order from top to bottom in the height direction. A first side-end-side bonding region is formed by directly bonding the front wall portion and the rear wall portion in a portion of the second overlapping region corresponding to the first side end. The first main bonding region is adjacent to the first side-end-side bonding region in the height direction. The third main bonding region defines the lowermost end of the first overlapping region in the portion corresponding to the first side end. In the portion of the first overlapping region corresponding to the second side end, the front wall portion, the front wall portion side crotch portion, the rear wall portion side crotch portion and the rear wall portion are overlapped in this order, and the front wall portion and the front wall portion side crotch portion are joined to each other, and the rear wall portion side crotch portion and the rear wall portion are joined to each other, thereby providing a fourth main joining region, a fifth main joining region and a sixth main joining region positioned at a distance from each other along the height direction. In a portion of the first overlapping region corresponding to the second side end, a third cutout and a fourth cutout are provided in both the front wall crotch portion and the rear wall crotch portion, spaced apart in the height direction, to form a third minor bonded region formed by directly joining the front wall and the rear wall in a portion corresponding to the third cutout, and a fourth minor bonded region formed by directly joining the front wall and the rear wall in a portion corresponding to the fourth cutout. The fourth main bonded region, the third minor bonded region, the fifth main bonded region, the fourth minor bonded region, and the sixth main bonded region are adjacently arranged in this order from top to bottom in the height direction. In a portion of the second overlapping region corresponding to the second side end, a second side end bonded region formed by directly joining the front wall and the rear wall is formed. The fourth main bonded region is adjacent to the second side end bonded region in the height direction. The sixth main bonding region defines the lowermost end of the first overlapping region in a portion corresponding to the second side end portion.

[0007] In the standing pouch according to the present invention, when the length of the first main bonding region in the height direction is A1, the length of the second main bonding region in the height direction is B1, the length of the third main bonding region in the height direction is C1, the length of the first minor bonding region in the height direction is D1, the length of the second minor bonding region in the height direction is E1, the length of the fourth main bonding region in the height direction is A2, the length of the fifth main bonding region in the height direction is B2, the length of the sixth main bonding region in the height direction is C2, the length of the third minor bonding region in the height direction is D2, and the length of the fourth minor bonding region in the height direction is E2, the following formulas (1) to (12) are satisfied. A1 <D1···(1) A1 <E1···(2) B1 <D1···(3) B1 <E1···(4) A1 <C1···(5) B1 <C1···(6) A2 <D2···(7) A2 <E2···(8) B2 <D2···(9) B2 <E2···(10) A2 <C2···(11) B2 <C2···(12) [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a standing pouch with improved durability against dropping. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a front view of a standing pouch according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the standing pouch shown in FIG. [Figure 3] 10 is a schematic diagram for explaining how the front wall portion, the rear wall portion, and the bottom crotch portion are overlapped. FIG. [Figure 4]2 is an enlarged front view of a main part of the first overlapping region shown in FIG. 1, the portion corresponding to the first side end portion. [Figure 5] 2 is an enlarged front view of a main part of the first overlapping region shown in FIG. 1, the portion corresponding to the second side end portion. [Figure 6] 1 is a table showing the dimensions of the standing pouch used in the verification test and the results of the verification test. [Figure 7] FIG. 10 is an enlarged front view of a main part of the first overlapping region of the standing pouch according to the first modified example, the portion corresponding to the first side end portion. [Figure 8] FIG. 10 is a front view of a standing pouch according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0011] (Embodiment) FIG. 1 is a front view of a standing pouch according to an embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. FIG. 3 is a schematic diagram illustrating how the front wall, rear wall, and bottom gusset are superimposed. First, the overall configuration of a standing pouch 1A according to this embodiment will be described with reference to FIGS. 1 to 3. For ease of understanding, in FIG. 1, the same pattern is applied to the bonded regions of the sheet-like members constituting the standing pouch 1A in regions corresponding to first to sixth main bonded regions (described later), while patterns different from those of the first to fourth sub-bonded regions are applied to the regions corresponding to the first to sixth main bonded regions. Furthermore, the bonded regions of the sheet-like members corresponding to the other regions are colored in light gray (the same applies to FIGS. 4, 5, 7, and 8, described later).

[0012] 1 and 2, the standing pouch 1A includes a pair of sheet-like members facing each other and a sheet-like member folded in half so as to be interposed between the pair of sheet-like members. One of the pair of sheet-like members defines a front wall portion 101, and the other defines a rear wall portion 102. The folded sheet-like member defines a bottom gusset portion 103.

[0013] The inside of the standing pouch 1A is provided with a storage space 100a defined by a front wall portion 101, a rear wall portion 102, and a bottom gusset portion 103. The contents stored in the storage space 100a are usually liquid, but may also be granular, powdery, or the like.

[0014] The standing pouch 1A is flat and has a substantially rectangular outer shape when viewed from the front when no contents are contained in the containing space 100a.

[0015] The standing pouch 1A has a first side end 21 and a second side end 22 positioned opposite each other in its width direction (i.e., the left-right direction in Figure 1), and an upper end 31 and a lower end 32 positioned opposite each other in its height direction (i.e., the up-down direction in Figure 1).

[0016] As shown in Fig. 2, the bottom crotch portion 103 is folded in half to include a front wall crotch portion 103a located on the front wall 101 side and a rear wall crotch portion 103b located on the rear wall 102 side. The bottom crotch portion 103 is positioned between the front wall 101 and the rear wall 102 with its fold located on the upper end portion 31 side. The lower end of the front wall crotch portion 103a is connected to the lower end of the front wall 101. The lower end of the rear wall crotch portion 103b is connected to the lower end of the rear wall 102.

[0017] When the standing pouch 1A is viewed from the front with no contents contained in the storage space 100a, the dimension between the lower end of the bottom gusset 103 and the fold (see L1 in FIG. 1) is preferably 35 mm or more and 80 mm or less, and more preferably 40 mm or more and 65 mm or less. This dimension L1 corresponds to the length of the bottom gusset 103 in the height direction of the standing pouch 1A.

[0018] 1 and 2, when no contents are stored in the storage space 100a, the lower end portion 32 has a first overlapping region 210 formed by overlapping the front wall portion 101, the rear wall portion 102, and the bottom crotch portion 103. On the other hand, the portion excluding the lower end portion 32 has a second overlapping region 220 formed by overlapping the front wall portion 101 and the rear wall portion 102.

[0019] 1, a first-side-end joining region 221 is formed by directly joining the front wall 101 and the rear wall 102 in a portion of the second overlapping region 220 corresponding to the first side end 21. A second-side-end joining region 222 is formed by directly joining the front wall 101 and the rear wall 102 in a portion of the second overlapping region 220 corresponding to the second side end 22.

[0020] The first side end joining region 221 and the second side end joining region 222 extend in a direction parallel to the height direction of the standing pouch 1A.

[0021] An upper end side joining region 223 is formed in a portion of the second overlapping region 220 corresponding to the upper end 31 by directly joining the front wall 101 and the rear wall 102. The region of the upper end side joining region 223 located on the second side end 22 side extends in a direction parallel to the width direction of the standing pouch 1A. The region of the upper end side joining region 223 located on the first side end 21 side extends in a direction that slopes toward the lower end 32 as it moves away from the second side end 22.

[0022] Spout 300 is attached to a region of upper end side joint region 223 that extends along the inclined direction. Spout 300 has base 301 located at one end in the axial direction, and substantially cylindrical spouting portion 302 that protrudes from base 301. Cap 500 is provided on spouting portion 302, which can be attached and detached to open and close spouting portion 302.

[0023] Base portion 301 is sandwiched between and joined to front wall portion 101 and rear wall portion 102 that define upper end side joining region 223. In this way, spout 300 is attached to upper end side joining region 223.

[0024] In the region of the first overlapping region 210 located on the lower end 32 side, other than the region where the first to sixth main joining regions 211a1 to 211a6 and the first to fourth sub-joining regions 211b1 to 211b4 described below are formed, there is a lower end side joining region 213 formed by the front wall portion 101, the front wall side crotch portion 103a, the rear wall side crotch portion 103b and the rear wall portion 102 being overlapped in this order, and the front wall portion 101 and the front wall side crotch portion 103a being joined to each other and the rear wall side crotch portion 103b and the rear wall portion 102 being joined to each other.

[0025] When the standing pouch 1A is viewed from the front when it is not filled with contents, the upper edge of the lower end side joining region 213 is curved in an approximately U-shape so as to approach the lower end 32 as it moves from the outside to the inside in the width direction of the standing pouch 1A.

[0026] The front wall 101, rear wall 102, and bottom gusset 103 of the standing pouch 1A are made of a sheet-like member, such as a resin film. The sheet-like member is preferably a laminate of a base film layer that exhibits the basic properties required for packaging (such as impact resistance, abrasion resistance, and heat resistance) and a sealant layer that enables bonding. In some cases, the sheet-like member may be a laminate that includes, in addition to the base film layer and sealant layer, a barrier layer that exhibits additional properties such as high gas barrier properties and light blocking properties, between the base film layer and the sealant layer.

[0027] Examples of materials for the base film layer include polyesters such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polycarbonate; polyolefins such as polyethylene and polypropylene; polyamides such as nylon 6 and nylon 66; polyacrylonitrile, polyimide, polyvinyl chloride, polyvinylidene chloride, polymethyl methacrylate, and polyethersulfone.

[0028] Examples of materials for the sealant layer include low-density polyethylene, linear low-density polyethylene, ethylene-propylene copolymer, unstretched polypropylene, biaxially oriented nylon, ethylene-olefin copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, and ethylene-vinyl acetate copolymer.

[0029] The thickness of each of the sealant layers included in the front wall portion 101, the rear wall portion 102, and the bottom gusset portion 103 is preferably 50 μm or more and 200 μm or less, which allows the standing pouch 1A to be made thinner, thereby reducing the amount of resin used.

[0030] Examples of materials for the barrier layer include metals such as aluminum, resins such as vinylidene chloride and ethylene-vinyl alcohol copolymer, aluminum oxide, and silica.

[0031] Methods for joining the front wall 101, the rear wall 102 and the bottom crotch 103 together include fusion bonding using heat sealing, ultrasonic sealing, high frequency sealing or the like, or bonding using an adhesive.

[0032] Fig. 4 is an enlarged front view of a main portion of the first overlapping region 210 corresponding to the first side end portion shown in Fig. 1. Fig. 5 is an enlarged front view of a main portion of the first overlapping region 210 corresponding to the second side end portion shown in Fig. 1. Next, with reference to Figs. 4 and 5 and the above-mentioned Figs. 1 and 3, the detailed configurations of the portion of the first overlapping region 210 corresponding to the first side end portion 21 of the standing pouch 1A and the portion of the first overlapping region 210 corresponding to the second side end portion 22 of the standing pouch 1A will be described.

[0033] As shown in Figures 1 and 4, in the portion of the first overlapping region 210 corresponding to the first side end portion 21, the first main bonding region 211a1, the second main bonding region 211a2, and the third main bonding region 211a3 are positioned at a distance from each other along the height direction of the standing pouch 1A.

[0034] The first main bonding region 211a1 is disposed adjacent to the first side end portion side bonding region 221 in the height direction. The third main bonding region 211a3 defines the lowermost end of the first overlapping region 210 in the portion corresponding to the first side end portion 21.

[0035] The first main bonding area 211a1, the second main bonding area 211a2 and the third main bonding area 211a3 are formed by overlapping the front wall portion 101, the front wall portion side crotch portion 103a, the rear wall portion side crotch portion 103b and the rear wall portion 102 in this order, and by bonding the front wall portion 101 and the front wall portion side crotch portion 103a to each other and bonding the rear wall portion side crotch portion 103b and the rear wall portion 102 to each other.

[0036] 1, 3, and 4, a first cutout 103s1 and a second cutout 103s2, which are spaced apart in the height direction, are provided in both the front wall crotch portion 103a and the rear wall crotch portion 103b in a portion of the first overlapping region 210 corresponding to the first side end 21. Therefore, a first sub-bonding region 211b1 formed by directly joining the front wall 101 and the rear wall 102 in a portion corresponding to the first cutout 103s1, and a second sub-bonding region 211b2 formed by directly joining the front wall 101 and the rear wall 102 in a portion corresponding to the second cutout 103s2 are located in the portion of the first overlapping region 210 corresponding to the first side end 21.

[0037] In this embodiment, a first cutout 103s1 and a second cutout 103s2, each cut into a substantially semicircular shape, are provided in the front wall crotch portion 103a and the rear wall crotch portion 103b, respectively. The shapes of the first cutout 103s1, the second cutout 103s2, the first sub-bonding region 211b1, and the second sub-bonding region 211b2 are not limited to a substantially semicircular shape and can be changed as appropriate. The shapes of the first cutout 103s1 and the second cutout 103s2 may be different from each other, and accordingly, the shapes of the first sub-bonding region 211b1 and the second sub-bonding region 211b2 may also be different from each other.

[0038] The first main bonding area 211a1, the first sub-bonding area 211b1, the second main bonding area 211a2, the second sub-bonding area 211b2 and the third main bonding area 211a3 described above are arranged adjacent to each other in this order from top to bottom in the height direction of the standing pouch 1A.

[0039] As shown in Figures 1 and 5, in the portion of the first overlapping region 210 corresponding to the second side end portion 22, the fourth main bonding region 211a4, the fifth main bonding region 211a5 and the sixth main bonding region 211a6 are positioned at a distance from each other along the height direction of the standing pouch 1A.

[0040] The fourth main bonding region 211a4 is disposed adjacent to the second side end portion side bonding region 222 in the height direction. The sixth main bonding region 211a6 defines the lowermost end of the first overlapping region 210 in the portion corresponding to the second side end portion 22.

[0041] The fourth main bonding area 211a4, the fifth main bonding area 211a5 and the sixth main bonding area 211a6 are formed by overlapping the front wall portion 101, the front wall portion side crotch portion 103a, the rear wall portion side crotch portion 103b and the rear wall portion 102 in this order, and by bonding the front wall portion 101 and the front wall portion side crotch portion 103a to each other and bonding the rear wall portion side crotch portion 103b and the rear wall portion 102 to each other.

[0042] 1, 3, and 5, a third cutout 103s3 and a fourth cutout 103s4, which are spaced apart in the height direction, are provided in both the front wall crotch portion 103a and the rear wall crotch portion 103b in a portion of the first overlapping region 210 corresponding to the second side end 22. Therefore, a third sub-bonding region 211b3 formed by directly joining the front wall 101 and the rear wall 102 in a portion corresponding to the third cutout 103s3, and a fourth sub-bonding region 211b4 formed by directly joining the front wall 101 and the rear wall 102 in a portion corresponding to the fourth cutout 103s4 are located in the portion of the first overlapping region 210 corresponding to the second side end 22.

[0043] In this embodiment, a third cutout 103s3 and a fourth cutout 103s4, which are cut out in a substantially semicircular shape, are provided in the front wall crotch portion 103a and the rear wall crotch portion 103b, respectively. Note that the shapes of the third cutout 103s3, the fourth cutout 103s4, the third sub-bonding region 211b3, and the fourth sub-bonding region 211b4 are not limited to a substantially semicircular shape and can be changed as appropriate.

[0044] The fourth main bonding area 211a4, the third sub-bonding area 211b3, the fifth main bonding area 211a5, the fourth sub-bonding area 211b4 and the sixth main bonding area 211a6 described above are arranged adjacent to each other in this order from top to bottom in the height direction of the standing pouch 1A.

[0045] 4 and 5, the length of the first main bonding region 211a1 in the height direction of the standing pouch 1A is defined as A1, the length of the second main bonding region 211a2 is defined as B1, the length of the third main bonding region 211a3 is defined as C1, the length of the first sub-bonding region 211b1 is defined as D1, and the length of the second sub-bonding region 211b2 is defined as E1. The length of the fourth main bonding region 211a4 in the height direction is defined as A2, the length of the fifth main bonding region 211a5 is defined as B2, the length of the sixth main bonding region 211a6 is defined as C2, the length of the third sub-bonding region 211b3 is defined as D2, and the length of the fourth sub-bonding region 211b4 is defined as E2. In this case, the standing pouch 1A satisfies the following formulas (1) to (12).

[0046] A1 <D1···(1) A1 <E1···(2) B1 <D1···(3) B1 <E1···(4) A1 <C1···(5) B1 <C1···(6) A2 <D2···(7) A2 <E2···(8) B2 <D2···(9) B2 <E2···(10) A2 <C2···(11) B2 <C2···(12)

[0047] Here, the length of the first main joining region 211a1 in the height direction of the standing pouch 1A (i.e., A1) means the length in the height direction of the portion of the first main joining region 211a1 that defines the end of the standing pouch 1A in the width direction. The same applies to B1, C1, D1, E1, A2, B2, C2, D2, and E2.

[0048] Furthermore, the standing pouch 1A more preferably satisfies the following formulas (13) to (16). A1×1.1≦C1 (13) B1×1.1≦C1 (14) A2×1.1≦C2 (15) B2×1.1≦C2 (16)

[0049] A1 and A2 are preferably 2 mm or more and 8 mm or less. B1 and B2 are preferably 1 mm or more and 10 mm or less. This significantly improves the drop resistance of the standing pouch 1A described below.

[0050] Furthermore, C1 and C2 are preferably 8 mm or more and 13 mm or less, D1 and D2 are preferably 12 mm or more and 18 mm or less, and E1 and E2 are preferably 12 mm or more and 18 mm or less.

[0051] By configuring it as described above, it is possible to provide a standing pouch 1A that is improved in durability against dropping.

[0052] That is, when the standing pouch 1A is dropped, the load generated by the drop concentrates on the boundary between the lower end of the first side end joining region 221 and the upper end of the first main joining region 211a1, which makes the bag prone to tearing starting from the boundary. This is because an impact load is applied to the boundary in a direction parallel to the height direction of the standing pouch 1A, and because the first main joining region 211a1, where the front wall crotch 103a and the rear wall crotch 103b are not joined to each other, deforms so as to bifurcate, causing the boundary to be pulled in both directions: from the front wall 101 toward the rear wall 102 (i.e., leftward in FIG. 2 ) and from the rear wall 102 toward the front wall 101 (i.e., rightward in FIG. 2 ).

[0053] This phenomenon also occurs when the standing pouch 1A is dropped and attention is focused on the second side edge 22. Therefore, when the standing pouch 1A is dropped, bag tearing is likely to occur starting from either or both of the boundary between the lower end portion of the first side edge side joining region 221 and the upper end portion of the first main joining region 211a1 and the boundary between the lower end portion of the second side edge side joining region 222 and the upper end portion of the fourth main joining region 211a4.

[0054] In this regard, the standing pouch 1A according to the present embodiment satisfies the above-described formulas (1) and (2). By configuring A1 to be smaller than both D1 and E1 in this manner, the amount of deformation of the first main bonded region 211a1 that causes the first main bonded region 211a1 to bifurcate as described above is effectively reduced, and as a result, the concentration of load on the boundary portion is suppressed.

[0055] Similarly to the first main bonding region 211a1, the second main bonding region 211a2 can also be deformed to expand into two branches, and the standing pouch 1A satisfies the above-described formulas (3) and (4). By configuring B1 to be smaller than both D1 and E1, the amount of deformation of the second main bonding region 211a2 is effectively reduced, which also prevents the load from concentrating on the boundary portion.

[0056] On the other hand, the third main bonding region 211a3 is different in configuration from the first main bonding region 211a1 and the second main bonding region 211a2 in that there is no portion below the third main bonding region 211a3 that is formed by directly bonding the front wall portion 101 and the rear wall portion 102, as in the first sub-bonding region 211b1 and the second sub-bonding region 211b2. That is, the third main bonding region 211a3 has high cushioning performance for absorbing the impact load caused by the above-mentioned drop, due to its deformability such that its lower end can expand.

[0057] The standing pouch 1A according to the present embodiment satisfies the above-mentioned formulas (5) and (6). In this manner, by configuring C1 to be larger than both A1 and B1, the third main bonding region 211a3 can effectively absorb the impact load.

[0058] Furthermore, the first sub-bonding region 211b1 and the second sub-bonding region 211b2 are both less deformed than the first main bonding region 211a1 and the second main bonding region 211a2, which tend to deform and expand into two branches as described above. This is because the first sub-bonding region 211b1 and the second sub-bonding region 211b2 are formed by directly bonding the front wall portion 101 and the rear wall portion 102.

[0059] Therefore, by satisfying the formulas (1) to (6), the first sub-bonding region 211b1 and the second sub-bonding region 211b2, which have a relatively small amount of deformation as described above, can be positioned closer to the boundary portion. As a result, the amount of deformation of the first main bonding region 211a1 and the second main bonding region 211a2 is effectively reduced, which also makes it possible to prevent the load from concentrating on the boundary portion.

[0060] Furthermore, the standing pouch 1A according to this embodiment satisfies the above-described formulas (7) and (8). By configuring A2 to be smaller than both D2 and E2, the amount of deformation of the fourth main bonding region 211a4 that bifurcates as described above is effectively reduced, and as a result, the concentration of load on the boundary between the lower end portion of the second-side bonding region 222 and the upper end portion of the fourth main bonding region 211a4 is suppressed.

[0061] Furthermore, the fifth main bonding region 211a5 can also be deformed to expand into two branches like the fourth main bonding region 211a4, and the standing pouch 1A satisfies the above-mentioned formulas (9) and (10). By configuring B2 to be smaller than both D2 and E2 in this way, the amount of deformation of the fifth main bonding region 211a5 is effectively reduced, which also prevents the load from concentrating on the boundary portion.

[0062] On the other hand, the sixth main bonding region 211a6 is different in configuration from the fourth main bonding region 211a4 and the fifth main bonding region 211a5 in that there is no portion below the sixth main bonding region 211a6 that is formed by directly bonding the front wall portion 101 and the rear wall portion 102, as in the third sub-bonding region 211b3 and the fourth sub-bonding region 211b4. That is, the sixth main bonding region 211a6 has high cushioning performance for absorbing the impact load caused by the above-mentioned drop, due to the fact that its lower end is deformable so as to widen.

[0063] The standing pouch 1A according to the present embodiment satisfies the above-described formulas (11) and (12). In this manner, by configuring C2 to be larger than both A2 and B2, the sixth main bonded region 211a6 can effectively absorb the impact load.

[0064] Furthermore, the third sub-bonding region 211b3 and the fourth sub-bonding region 211b4 are both less deformed than the fourth main bonded region 211a4 and the fifth main bonded region 211a5, which tend to deform and expand into two branches as described above. This is because the third sub-bonding region 211b3 and the fourth sub-bonding region 211b4 are formed by directly bonding the front wall portion 101 and the rear wall portion 102.

[0065] Therefore, by satisfying the formulas (7) to (12), the third sub-bonding region 211b3 and the fourth sub-bonding region 211b4, which have a relatively small amount of deformation as described above, can be disposed closer to the boundary portion. As a result, the amount of deformation of the fourth main bonding region 211a4 and the fifth main bonding region 211a5 is effectively reduced, which also prevents the load from concentrating on the boundary portion.

[0066] With the above-described configuration, when the standing pouch 1A is dropped, it is possible to prevent both the occurrence of tearing of the pouch starting from the boundary portion on the side of the first side end 21 and the occurrence of tearing of the pouch starting from the boundary portion on the side of the second side end 22. Therefore, the standing pouch 1A can be improved in durability against drops.

[0067] The effect of improving the durability of the standing pouch 1A against dropping as described above has been confirmed by a verification test to be described later.

[0068] Furthermore, the standing pouch 1A according to the present embodiment satisfies the above-mentioned formulas (13) to (16). By configuring it in this manner, the third main bonding region 211a3 and the sixth main bonding region 211a6 can more effectively absorb the above-mentioned impact load.

[0069] As described above, the standing pouch 1A according to the present embodiment has been described with reference to an example in which the front wall 101, the rear wall 102, and the bottom crotch 103 are each made of separate sheet-like members, but the front wall 101, the rear wall 102, and the bottom crotch 103 do not necessarily have to be made of separate sheet-like members. For example, the front wall 101, the rear wall 102, and the bottom crotch 103 may be made by folding a single sheet-like member, or the front wall 101 and the bottom crotch 103 may be made by folding a single sheet-like member and the rear wall 102 may be made of a separate sheet-like member, or the rear wall 102 and the bottom crotch 103 may be made by folding a single sheet-like member and the front wall 101 may be made of a separate sheet-like member.

[0070] (Verification test) In the verification test, verification was conducted to clarify the relationship between the satisfaction of the above formulas (1) to (12) and the durability of the standing pouch against dropping. Figure 6 is a table showing the dimensions of the standing pouch used in the verification test and the results of the verification test.

[0071] As shown in Fig. 1, the standing pouch according to Example S1 prepared in this verification test has a dimension L1 between the lower end of the bottom gusset and the fold of 50 mm, a height dimension L2 of 280 mm, and a width dimension L3 of 200 mm. Dimensions A1, B1, C1, D1, E1, A2, B2, C2, D2, and E2 of the standing pouch according to Example S1 are as shown in Fig. 6.

[0072] The standing pouch according to Example S2 prepared in this verification test had L1 of 60 mm, L2 (height dimension) of 340 mm, and L3 (width dimension) of 200 mm. Dimensions A1, B1, C1, D1, E1, A2, B2, C2, D2, and E2 of the standing pouch according to Example S2 are as shown in FIG. 6.

[0073] In this way, the standing pouches according to Examples S1 and S2 both satisfy the above formulas (1) to (12).

[0074] The standing pouch according to Comparative Example T1 prepared in this verification test had an L1 of 60 mm, a height dimension L2 of 340 mm, and a width dimension L3 of 200 mm. Dimensions A1, B1, C1, D1, E1, A2, B2, C2, D2, and E2 of the standing pouch according to Comparative Example T1 are as shown in FIG. 6.

[0075] The standing pouch according to Comparative Example T2 prepared in this verification test had L1 of 60 mm, L2 (height dimension) of 315 mm, and L3 (width dimension) of 200 mm. Dimensions A1, B1, C1, D1, E1, A2, B2, C2, D2, and E2 of the standing pouch according to Comparative Example T2 are as shown in FIG. 6.

[0076] Thus, the standing pouches of Comparative Examples T1 and T2 do not satisfy all of the above formulas (1) to (12). More specifically, the standing pouches of Comparative Examples T1 and T2 both satisfy the above formulas (1), (2), (7), and (8), but do not satisfy the above formulas (3) to (6), and (9) to (12).

[0077] The sheet-like members that make up the front wall, back wall, and bottom gusset of the standing pouch prepared in this verification test consist of a base film layer made of 12 μm thick aluminum-deposited polyethylene terephthalate and 15 μm thick nylon 6, and a sealant layer made of 120 μm thick linear low-density polyethylene.

[0078] In conducting the verification, first, 1.1 L of cold water was filled into the sample of the standing pouch according to Example S1. Similarly, 1.9 L of cold water was filled into the samples of the standing pouch according to Example S2 and Comparative Example T1, and 1.6 L of cold water was filled into the sample of the standing pouch according to Comparative Example T2. Note that the number of samples of the standing pouch according to Examples S1 and S2 and the number of samples of the standing pouch according to Comparative Examples T1 and T2 was one each.

[0079] Next, each sample of the standing pouch filled with cold water was allowed to drop from a height of 200 cm from the ground to the ground a total of five times to check whether the pouch broke. In this verification test, the free-fall verification was performed with the bottom gusset of the standing pouch facing the ground (i.e., upright position).

[0080] As shown in Figure 6, no bag breakage occurred in Examples S1 and S2, which satisfied all of the formulas (1) to (12). On the other hand, bag breakage occurred in Comparative Examples T1 and T2, which did not satisfy all of the formulas (1) to (12). From these results, it was confirmed that by satisfying the formulas (1) to (12), a standing pouch with improved drop resistance can be obtained.

[0081] (First Modification) Fig. 7 is an enlarged front view of a main portion of the first overlapping region of a standing pouch according to a first modified example, the portion corresponding to the first side edge. Standing pouch 1A1 according to the first modified example, which is based on the embodiment described above, will be described below with reference to Fig. 7. The configuration of the portion of first overlapping region 210 of standing pouch 1A1 corresponding to second side edge 22 is mirror-symmetrical in the width direction of standing pouch 1A1 to the configuration of the portion of first overlapping region 210 corresponding to first side edge 21.

[0082] As shown in FIG. 7, the standing pouch 1A1 of the first modified example differs from the standing pouch 1A of the above-described embodiment in the configuration of the end of the lower end 32 on the first side end 21 side and the end of the lower end 32 on the second side end 22 side.

[0083] More specifically, in the standing pouch 1A according to the embodiment described above, the end of the lower end 32 on the side of the first side end 21 and the end of the lower end 32 on the side of the second side end 22 both extend along a direction parallel to the width direction of the standing pouch 1A (see Figure 1), whereas in the standing pouch 1A1 according to the first modified example, the end of the lower end 32 on the side of the first side end 21 and the end of the lower end 32 on the side of the second side end 22 are both inclined with respect to a direction parallel to the width direction of the standing pouch 1A1.

[0084] More specifically, in the standing pouch 1A1, the end of the lower end 32 on the side of the first side end 21 and the end of the lower end 32 on the side of the second side end 22 are both inclined so as to approach the upper end 31 as they move from the inside to the outside in the width direction.

[0085] Even with this configuration, the same effects as those described in the above-described embodiment can be obtained, and the standing pouch can be improved in durability against dropping. Furthermore, with this configuration, the self-standing ability of the standing pouch can be improved.

[0086] (Second Modification) Fig. 8 is a front view of a standing pouch according to a second modified example. A standing pouch 1A2 according to a second modified example based on the above-described embodiment will be described below with reference to Fig. 8.

[0087] As shown in FIG. 8, a standing pouch 1A2 according to the second modified example differs from the standing pouch 1A according to the above-described embodiment in the configuration of the lower end side joining region 213.

[0088] More specifically, in the standing pouch 1A according to the above-described embodiment, when the standing pouch 1A is viewed from the front when it is not filled with contents, the upper edge of the lower end side joining region 213 is curved in an approximately U-shape so as to approach the lower end 32 as it moves from the outside to the inside in the width direction of the standing pouch 1A (see Figure 1), whereas in the standing pouch 1A2 according to the second modified example, when the standing pouch 1A2 in the above state is viewed from the front, the upper edge of the lower end side joining region 213 is composed of a pair of linearly inclined portions so as to approach the lower end 32 as it moves from the outside to the inside in the width direction, and a portion that extends linearly along a direction parallel to the width direction.

[0089] Even when configured in this manner, effects similar to those described in the above-mentioned embodiment can be obtained, and a standing pouch with improved durability against being dropped can be obtained.

[0090] (Addendum) The characteristic configurations of the standing pouches disclosed in the above-described embodiments and their modifications can be summarized as follows.

[0091] [Appendix 1] A standing pouch having a first side end and a second side end positioned opposite each other in a width direction, and an upper end and a lower end positioned opposite each other in a height direction, and having an internal storage space for storing contents, The storage space is defined by a front wall, a rear wall, and a bottom gusset. a first overlapping region formed by overlapping the front wall portion, the rear wall portion, and the bottom gusset portion when no contents are contained in the storage space is provided at the lower end portion; A second overlapping region is provided in the portion excluding the lower end portion, which is formed by overlapping the front wall portion and the rear wall portion when no contents are contained in the storage space, the bottom crotch is folded in half to include a front wall side crotch located on the front wall side and a rear wall side crotch located on the rear wall side, and is positioned between the front wall and the rear wall with the fold located on the upper end side; a lower end of the front wall side crotch portion is connected to a lower end of the front wall portion, and a lower end of the rear wall side crotch portion is connected to a lower end of the rear wall portion, In a portion of the first overlapping region corresponding to the first side end, the front wall portion, the front wall portion side crotch portion, the rear wall portion side crotch portion, and the rear wall portion are overlapped in this order, and the front wall portion and the front wall portion side crotch portion are joined to each other and the rear wall portion side crotch portion and the rear wall portion are joined to each other, thereby providing a first main bonding region, a second main bonding region, and a third main bonding region positioned at a distance from each other along the height direction; In a portion of the first overlapping region corresponding to the first side end, a first cutout portion and a second cutout portion positioned at a distance from each other in the height direction are provided in both the front wall portion side crotch portion and the rear wall portion side crotch portion, thereby forming a first sub-bonding region formed by directly joining the front wall portion and the rear wall portion in a portion corresponding to the first cutout portion, and a second sub-bonding region formed by directly joining the front wall portion and the rear wall portion in a portion corresponding to the second cutout portion, the first main bonding region, the first sub-bonding region, the second main bonding region, the second sub-bonding region, and the third main bonding region are adjacently arranged in this order from top to bottom in the height direction; a first side end portion side joining region formed by directly joining the front wall portion and the rear wall portion is formed in a portion of the second overlapping region corresponding to the first side end portion; the first main bonding region is disposed adjacent to the first side end side bonding region in the height direction, the third main joining region defines a lowermost end of the first overlapping region in a portion corresponding to the first side end portion; In a portion of the first overlapping region corresponding to the second side end, the front wall, the front wall side crotch, the rear wall side crotch, and the rear wall are overlapped in this order, and the front wall and the front wall side crotch are joined to each other and the rear wall side crotch and the rear wall are joined to each other, thereby providing a fourth main joining region, a fifth main joining region, and a sixth main joining region positioned at a distance from each other along the height direction; In a portion of the first overlapping region corresponding to the second side end, a third cutout portion and a fourth cutout portion positioned at a distance from each other in the height direction are provided in both the front wall portion side crotch portion and the rear wall portion side crotch portion, thereby forming a third sub-bonding region formed by directly joining the front wall portion and the rear wall portion in a portion corresponding to the third cutout portion, and a fourth sub-bonding region formed by directly joining the front wall portion and the rear wall portion in a portion corresponding to the fourth cutout portion, the fourth main bonding region, the third sub-bonding region, the fifth main bonding region, the fourth sub-bonding region, and the sixth main bonding region are adjacently arranged in this order from top to bottom in the height direction, a second side end portion side joining region formed by directly joining the front wall portion and the rear wall portion is formed in a portion of the second overlapping region corresponding to the second side end portion, the fourth main bonding region is disposed adjacent to the second side end portion side bonding region in the height direction, the sixth main bonding region defines a lowermost end of the first overlapping region in a portion corresponding to the second side end portion; A standing pouch that satisfies the following formulas (1) to (12), where A1 is the length of the first main bonding region in the height direction, B1 is the length of the second main bonding region in the height direction, C1 is the length of the third main bonding region in the height direction, D1 is the length of the first minor bonding region in the height direction, E1 is the length of the second minor bonding region in the height direction, A2 is the length of the fourth main bonding region in the height direction, B2 is the length of the fifth main bonding region in the height direction, C2 is the length of the sixth main bonding region in the height direction, D2 is the length of the third minor bonding region in the height direction, and E2 is the length of the fourth minor bonding region in the height direction. A1 <D1···(1) A1 <E1···(2) B1 <D1···(3) B1 <E1···(4) A1 <C1···(5) B1 <C1···(6) A2 <D2···(7) A2 <E2···(8) B2 <D2···(9) B2 <E2···(10) A2 <C2···(11) B2 <C2···(12)

[0092] [Appendix 2] A standing pouch according to appendix 1, which satisfies the following formulas (13) to (16): A1×1.1≦C1 (13) B1×1.1≦C1 (14) A2×1.1≦C2 (15) B2×1.1≦C2 (16)

[0093] [Appendix 3] A1 and A2 are both 2 mm or more and 8 mm or less, 3. The standing pouch according to claim 1 or 2, wherein B1 and B2 are both 1 mm or more and 10 mm or less.

[0094] [Appendix 4] 4. A standing pouch according to any one of claims 1 to 3, wherein when no contents are contained in the storage space, the length of the bottom gusset portion in the height direction is 35 mm or more and 80 mm or less.

[0095] (Other forms, etc.) The stand-up pouches according to the above-described embodiments and their modifications can significantly reduce the amount of resin used compared to containers made of resin molded products. Furthermore, the stand-up pouches according to the above-described embodiments and their modifications can be folded, unlike containers made of resin molded products, and can be disposed of after reducing their volume.

[0096] Furthermore, the shape, configuration, size, number, material, etc. of each part shown in the above-mentioned embodiment of the present invention and its modified examples can be changed in various ways as long as they do not deviate from the spirit of the present invention.

[0097] Furthermore, the characteristic configurations shown in the above-described embodiments of the present invention and their modifications can naturally be combined with each other without departing from the spirit of the present invention.

[0098] As such, the above-described embodiments and their modifications disclosed herein are illustrative in all respects and are not limiting. The technical scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0099] 1A,1A1,1A2 Standing pouch, 21 first side end, 22 second side end, 31 upper end, 32 lower end, 100a accommodation space, 101 front wall, 102 rear wall, 103 bottom gusset, 103a front wall side gusset, 103b rear wall side gusset, 103s1 1st deletion part, 103s2 2nd deletion part, 103s3 3rd deletion part, 103s4 4th deletion part, 210 1st overlap area, 211a1 1st main joint area, 211a2 2nd main joint area, 211a3 3rd main joint area, 211a4 4th main joint area, 211a5 5th main joint area, 211a6 6th main joint area, 211b1 1st sub-joint area, 211b2 Second sub-bonding region, 211b3 third sub-bonding region, 211b4 fourth sub-bonding region, 213 lower end side bonding region, 220 second overlapping region, 221 first side end side bonding region, 222 second side end side bonding region, 223 upper end side bonding region, 300 spout, 301 base, 302 spouting portion, 500 cap.

Claims

1. A standing pouch having a first side end and a second side end positioned opposite each other in a width direction, and an upper end and a lower end positioned opposite each other in a height direction, and having an internal storage space for storing contents, a front wall portion, a rear wall portion, and a bottom gusset portion that define the storage space; a first overlapping region formed by overlapping the front wall portion, the rear wall portion, and the bottom gusset portion when no contents are contained in the storage space is provided at the lower end portion; A second overlapping region is provided in a portion excluding the lower end portion, the second overlapping region being formed by overlapping the front wall portion and the rear wall portion when no contents are contained in the storage space, the bottom crotch is folded in half to include a front wall side crotch located on the front wall side and a rear wall side crotch located on the rear wall side, and is positioned between the front wall and the rear wall with the fold located on the upper end side; a lower end of the front wall side crotch portion is connected to a lower end of the front wall portion, and a lower end of the rear wall side crotch portion is connected to a lower end of the rear wall portion, In a portion of the first overlapping region corresponding to the first side end, the front wall portion, the front wall portion side crotch portion, the rear wall portion side crotch portion, and the rear wall portion are overlapped in this order, and the front wall portion and the front wall portion side crotch portion are joined to each other, and the rear wall portion side crotch portion and the rear wall portion are joined to each other, thereby providing a first main bonding region, a second main bonding region, and a third main bonding region positioned at a distance from each other along the height direction; In a portion of the first overlapping region corresponding to the first side end, a first cutout portion and a second cutout portion positioned at a distance from each other in the height direction are provided in both the front wall portion side crotch portion and the rear wall portion side crotch portion, thereby forming a first sub-bonding region formed by directly joining the front wall portion and the rear wall portion in a portion corresponding to the first cutout portion, and a second sub-bonding region formed by directly joining the front wall portion and the rear wall portion in a portion corresponding to the second cutout portion, the first main bonding region, the first sub-bonding region, the second main bonding region, the second sub-bonding region, and the third main bonding region are adjacently arranged in this order from top to bottom in the height direction, a first side end joining region formed by directly joining the front wall portion and the rear wall portion in a portion of the second overlapping region corresponding to the first side end portion; the first main bonding region is disposed adjacent to the first side end side bonding region in the height direction, the third main bonding region defines a lowermost end of the first overlapping region in a portion corresponding to the first side end portion; In a portion of the first overlapping region corresponding to the second side end, the front wall portion, the front wall portion side crotch portion, the rear wall portion side crotch portion, and the rear wall portion are overlapped in this order, and the front wall portion and the front wall portion side crotch portion are joined to each other, and the rear wall portion side crotch portion and the rear wall portion are joined to each other, thereby providing a fourth main bonding region, a fifth main bonding region, and a sixth main bonding region positioned at a distance from each other along the height direction; In a portion of the first overlapping region corresponding to the second side end, a third cutout portion and a fourth cutout portion positioned at a distance from each other in the height direction are provided in both the front wall portion side crotch portion and the rear wall portion side crotch portion, thereby forming a third sub-bonding region formed by directly joining the front wall portion and the rear wall portion in a portion corresponding to the third cutout portion, and a fourth sub-bonding region formed by directly joining the front wall portion and the rear wall portion in a portion corresponding to the fourth cutout portion, the fourth main bonding region, the third sub-bonding region, the fifth main bonding region, the fourth sub-bonding region, and the sixth main bonding region are adjacently arranged in this order from top to bottom in the height direction, a second side end joining region formed by directly joining the front wall portion and the rear wall portion is formed in a portion of the second overlapping region corresponding to the second side end portion, the fourth main bonding region is disposed adjacent to the second side end bonding region in the height direction, the sixth main bonding region defines a lowermost end of the first overlapping region in a portion corresponding to the second side end portion; a standing pouch that satisfies the following formulas (1) to (12): A1, B1, C1, D1, E1, A2, B2, C2, D2, E2. A1<D1...(1) A1<E1...(2) B1<D1...(3) B1<E1...(4) A1<C1...(5) B1<C1...(6) A2<D2...(7) A2<E2...(8) B2<D2...(9) B2<E2...(10) A2<C2...(11) B2<C2...(12)

2. The standing pouch according to claim 1, which satisfies the following formulas (13) to (16): A1 × 1.1 ≦ C1 (13) B1 × 1.1 ≦ C1 (14) A2 × 1.1 ≦ C2 (15) B2 × 1.1 ≦ C2 (16)

3. A1 and A2 are both 2 mm or more and 8 mm or less, 3. The standing pouch according to claim 1, wherein B1 and B2 are both 1 mm or more and 10 mm or less.

4. 2. The standing pouch according to claim 1, wherein the length of the bottom gusset portion in the height direction is 35 mm or more and 80 mm or less when no contents are contained in the containing space.

Images