JP5462565B2 - Self-supporting bag and method for manufacturing self-supporting bag - Google Patents

Description

  The present invention relates to a self-supporting bag that does not cause discomfort to the hand when held by hand, and a method for manufacturing the self-supporting bag.

  A soft packaging material made of a plastic film or the like is known as a self-supporting bag body, a so-called self-supporting bag. One of the most common is called a standing pouch. This standing pouch has a front member, a back member, and a bottom member made of a gusset that is inserted into these bottom portions and folded in half. Both sides of the standing pouch are heat-sealed on the front member and the back member, the bottom is heat-sealed on the front member and the bottom member, and the back member and the bottom member.

  This standing pouch has heat seal portions on both sides. For this reason, when holding both sides with a hand, the heat seal part of this both sides worked like a knife edge, and there was a problem that an unpleasant feeling was given to a hand.

  In order to solve this problem, Patent Document 1 discloses a self-supporting bag 20 with a bottom gusset that has no heat seal portions on both sides. This self-supporting bag 20 is composed of a flat tube 21 having a crease on both sides and forming a loop, and a bottom gusset 22 having a rectangular pocket shape with the upper end closed and the lower end open. The bottom gusset 22 is accommodated in the bottom portion in the flat tube 21. The three edges of the bottom gusset 22 are flattened so that both sides of the bottom gusset 22 coincide with both inner sides of the flat tube 21 and the open lower end of the bottom gusset 22 coincides with the inner bottom portion of the flat tube 21. It is bonded to the inner surface of the tube 21. Here, the flat cylinder 21 has, for example, a base material layer 211 and a sealant layer 212, and the bottom gusset 22 has, for example, a base material layer 221 and a sealant layer 222.

  The bottom gusset 22 is made of, for example, a rectangular packaging material 22A and is manufactured as follows. First, the both side portions 22b and 22c of the rectangular packaging material 22A are folded at fold lines L21 and L22 so that the surfaces having no heat-sealing property are in close contact with each other to form folded surface portions (FIG. 30A). )reference). Second, it is folded in two at the fold line L23 in a direction perpendicular to the folding direction of the folding surface portion so that the surfaces having the heat sealing property of the folding surface portion and the surfaces having no heat sealing property of the central portion overlap each other. (See FIG. 30B). Third, the heat-sealing surfaces of the folded surface portions on both sides are joined together by heat sealing to obtain a bottom gusset 22 having a pocket shape (see FIG. 30C).

  FIG. 31 shows a cross-sectional view of a portion including the folded surface portion in the vicinity of the bottom portion of the self-supporting bag 20, that is, a cross-sectional view along C1-C1 shown in FIG. Even when the self-supporting bag 20 is manufactured, even if heat sealing for forming the overlapping bottom portion is performed in the flat tube 21 so that the inner surface of the flat tube 21 and the outer surface of the bottom gusset 22 formed of the pocket shape are in contact with each other, Since it is the base material layer 221-the base material layer 221, it is not heat-sealed. Thus, this self-supporting bag 20 does not have the heat seal part which protrudes on both sides, and does not give discomfort when it is held by hand.

JP 2004-161288 A

  The self-supporting bag 20 with a bottom gusset of Patent Document 1 has a palm seal portion A2 that is heat-sealed with a palm portion in which the folded surface portions of the bottom gusset 22 overlap each other and an inner surface of the flat tube 21 in contact with each other. . If there is at least a part of the joint seal portion A2 that is not in close contact with the bottom gusset 22 from the upper end to the lower end, the content leaks from that portion. Moreover, it is difficult to heat-seal the bag according to the upper edge of the bottom gusset 22 on the bag making. For this reason, the bottom heat seal portion S21, which is a heat seal for forming the bottom portion, is applied so as to slightly protrude upward from the upper end of the bottom gusset (part A1 in FIG. 29). A B1-B1 sectional view of FIG. 29 is shown in FIG. The protruding bottom heat seal portion S21 like the portions A1 and A5 of FIGS. 29 and 32 is a fusion portion between the inner surfaces of the flat tube 21. The fused portion has an edge, and gives an uncomfortable feeling when held by hand. Furthermore, since the fusion part becomes a trigger and it becomes easy to bend, self-supporting property falls.

  In the X12 section where the flat tube 21 and the bottom gusset 22 overlap, six laminated bodies overlap, and in the Y12 section including the portion A5 where the insides of the flat tubes 21 overlap, two stacked bodies overlap. Accordingly, the bottom heat seal part S21 is heat-sealed across a large step between the X12 and Y12 sections, that is, across the difference in the number of the four laminated bodies (see the part A6 in FIG. 32). Due to this level difference, a gap SP1 is generated between the flat tube 21 and the bottom gusset 22 and heat seal failure is likely to occur, and the contents may leak. For this reason, it is also described that a point seal is applied to the step portion (see FIG. 33). However, the load tends to concentrate on the point seal portion S24. In particular, when the contents are liquid, there is a possibility that the bag will break and the contents may leak.

  Further, in Patent Document 1, when the bottom gusset 22 and the flat tube 21 are heat-sealed at the bottom ends of the self-standing bags, the bottom gusset 22 does not have the folded portion and the folded portion. The number of stacked parts is different. For this reason, it is necessary to perform heat sealing across a region having a greatly different total thickness. Specifically, the portion having the folded portion is a large step between the X11 section of the six laminated bodies and the portion having no folded portion is the Y11 section of the four laminated bodies, that is, two laminated bodies. Heat sealing is performed across the number difference (see FIG. 31). Applying heat sealing across such regions having different total thicknesses tends to cause heat sealing failure at the portions A3 and A4 in FIG. Therefore, after the self-supporting bag 20 is filled with the content, the content leaks from the self-supporting bag 20 with the bottom gusset.

  It is an object of the present invention to provide a self-supporting bag having no uncomfortable edge at the hand-held portion all around the side surface of the bag body.

  Another object of the present invention is to provide a self-supporting bag in which no adhesion failure occurs in the bonding portion between the bag main body and the gusset, and the contents do not leak.

  Hereinafter, the features of the invention will be described with reference numerals. In addition, the code | symbol does not limit the characteristic of invention to embodiment.

  A feature of the first invention is that the tubular body (11) as a bag body and the folding of the body (11) are closed and one of the openings is provided inside the tubular body (11). A self-standing bag comprising a bottom portion (12) folded in two at a line (12a), wherein the bottom portion (12) has first and second bottom surface portions (12b, 12c), and each bottom portion has left and right side ends (12b1, 12b2, 12c1, 12c2) orthogonal to the fold line (12a) and lower ends (12b3, 12c3) parallel to the fold line (12a). The bottom part (12) is coupled by a coupling material (13, 14) that couples the bottom surface part (12b, 12c) and the body part (11) at the side end of the bottom part (12), and the lower end (12b3, 12c3). ) Is a self-supporting bag joined to the body (11).

  In the above self-supporting bag, the binding materials (13, 14) are arranged so as to cover all the side edges of one of the first and second bottom surfaces, and the binding materials (13, 14) are the first and second binding materials. One bottom face part and the said trunk | drum (11) are couple | bonded.

  The binding materials (13A, 13B, 14A, 14B) are arranged so as to cover all the side edges (12b1, 12b2, 12c1, 12c2) of the first and second bottom surface portions (12b, 12c), The binding material includes a first coupling portion (13A1, 13B1, 14A1, 14B1) disposed outside the first bottom surface portion (12b) and a second coupling disposed outside the second bottom surface portion (12c). Portion (13A2, 13B2, 14A2, 14B2), the first coupling portion (13A1, 13B1, 14A1, 14B1) couples the first bottom surface portion (12b) and the body portion (11), The two coupling portions (13A2, 13B2, 14A2, 14B2) are continuous with the first coupling portion (13A1, 13B1, 14A1, 14B1), and the first coupling portion (13A1, 13B1, 14A1, 14B1). Bound second bottom surface portion and (12c).

  The first and second coupling portions (13A1, 14A1, 13A2, and 14A2) are made of one coupling material (13A and 14A) having a fold line in the left-right direction, and the first and first fold lines are formed by the fold line (12a). It is divided into two coupling portions (13A1, 14A1, 13A2, 14A2), and is arranged at the side ends of the first and second bottom surface portions (12b, 12c) so as to sandwich the bottom portion from the upper end side of each bottom surface portion. Yes.

  Further, the first and second coupling portions (13B2, 13B3, 14B2, 14B3) are composed of one coupling material (13B, 14B) having folding lines (13B1, 14B1) in the vertical direction, and the folding lines (13B1, 14B1) 14B1) is partitioned into first and second coupling portions (13B2, 13B3, 14B2, 14B3), and at the side ends (12b1, 12b2, 12c1, 12c2) of the first and second bottom surface portions (12b, 12c). The bottom portion (12) is arranged so as to be sandwiched from the side end side of each bottom surface portion.

  Further, the length between the fold line (12a) of the bottom portion (12) and the lower end (12b3, 12c3) of the bottom portion (12), excluding the length of the lower end coupling portion, is the both sides of the bottom portion (12). It is half the length between the ends (12b1, 12b2, 12c1, 12c2).

  Further, the binding materials (13, 13A, 13B, 14, 14A, 14B) extend from the lower end to the upper end of the trunk portion (11).

  Moreover, the other opening of the trunk | drum (11) is closed by the top part (12) of the same shape as a bottom part (12).

  Further, the spout (16) is attached to the body (11).

  In addition, the left and right side edges (12c1, 12c2) are not aligned and shifted in the folded state of the binding material (13, 14).

  The second feature of the present invention is that the cylindrical body (11) as the bag body and one opening of the body (11) are closed and provided inside the cylindrical body (11). A self-standing bag comprising a bottom part in which two members are joined on one side, and the bottom part is partitioned into first and second bottom face parts with the joined one side as an upper end, and each bottom face part is connected to the bottom part Left and right side ends orthogonal to the one side and a lower end parallel to the combined side, and the bottom part is connected by a binding material that connects the bottom part and the body part at the side end of the bottom part And a self-supporting bag connected to the body at the lower end.

  The third feature of the present invention is that the cylindrical body (11) as the bag body and one opening of the body (11) are closed and provided inside the cylindrical body (11). A self-supporting bag composed of a cylindrical bottom part to which one open end is joined, and the bottom part is partitioned into first and second bottom face parts with the joined open end as an upper end, and each bottom face part Has left and right side ends orthogonal to the combined open end and a lower end parallel to the combined open end, and the bottom unit connects the bottom surface unit and the body unit at the side end of the bottom unit. It is a self-supporting bag that is joined by a binding material and joined to the body at the lower end.

  The fourth feature of the present invention is that a main body film (11A) constituting the trunk and a bottom film (12A) constituting the bottom are prepared, the bottom film (12A) is bent, and a fold line (12a) is prepared. Forming the first and second bottom surface portions (12b, 12c) with respect to the main body film (11A), the first bottom surface portion (12b) overlapping, and the bottom end of the main body film (11A) and the bottom The step of arranging the bottom film (12A) so that the lower ends of the films (12A) substantially coincide with each other, and the binders (13, 14) so as to cover all the side edges (12b1, 12b2, 12c1, 12c2) of the bottom film (12A). ), The step of bonding the bottom film (12A) and the main body film (11A) with the binder (13, 14), the main body film (11A) and the bottom film (12A) (13, 4) A step of forming a cylindrical shape with the surface being inward and joining both ends of the main film (11A) to each other, and a lower end of the main film (11A) and the first and second bottom surface portions (12b, 12c) is a method of manufacturing a self-supporting bag including a step of joining the lower end of the bag.

  In the method for manufacturing a self-supporting bag, the step of arranging the binder (13, 14) so as to cover all the side edges of the bottom film (12A) 2 is a step of disposing over only the bottom surface portion (12c).

  In addition, the step of arranging the binding materials (13A, 14A) so as to cover all the side edges of the bottom film (12A) bends the binding materials (13A, 14A) in the left-right direction to fold the bottom film (12A). It is a step of disposing the first bottom surface portion (12b) outside and the second bottom surface portion (12c) outside so as to sandwich the bottom film (12A) from the line side, and then on the main film (11A). The bottom film (12) on which the binding materials (13A, 14A) are disposed is disposed so that the bottom surface portion (12b) of 1 overlaps.

  Moreover, the process of arrange | positioning binding material (13B, 14B) so that all the side edges of a bottom film (12A) may be covered, a binding material (13B, 14B) is bent up and down, and the side edge of a bottom film (12A) It is a process of arrange | positioning a 1st bottom face part (12b) outer side and a 2nd bottom face part (12c) outer side so that a bottom film (12A) may be pinched | interposed from the side, and a 1st on a main body film (11A) after that The bottom film (12A) on which the binders (13B, 14B) are disposed is disposed so that the bottom surface portion (12b) overlaps.

  According to the self-supporting bag of the present invention, there is no portion where the insides of the side portions of the bag body are bonded together, and the side portion of the bag body is rounded. There is no. Moreover, since the opening of a bottom part opens in elliptical shape and circular shape, it is excellent in independence. Furthermore, since the adhesiveness between the trunk portion and the bottom portion is excellent, there is no risk of the contents leaking.

It is an elevation view of the self-standing bag of the first embodiment. It is a rear view of the self-supporting bag shown in FIG. (A) is the schematic which shows the junction structure of the side edges of a rectangular film, (B) And (C) is the schematic which shows the junction structure concerning deformation | transformation. (A) is a development view of the self-supporting bag shown in FIG. 1, and (B) is a development view of the self-supporting bag related to deformation. (A) is a partially expanded development view of the self-supporting bag 10 before applying the heat seal HS1, and (B) is a partially expanded development view of the self-supporting bag after heat sealing. (A) is sectional drawing along VIA-VIA of FIG. 2, (B) is sectional drawing along VIB-VIB of FIG. It is sectional drawing along VII-VII shown in FIG. (A) is an expanded view of the bottom part of the self-supporting bag concerning the second embodiment and the first and second bonding members, and (B) is the bent bottom part and the first and second bonding members. FIG. (A) is an expanded development view of the self-supporting bag 10A before applying the heat seal HS3, and (B) is an expanded development view of the self-supporting bag after heat sealing. It is sectional drawing along XX of FIG.9 (B). FIG. 6 is a cross-sectional view corresponding to FIG. 6A taken along the line VIA-VIA of FIG. 2, and FIG. 6B is a cross-sectional view taken along line VIB-VIB of FIG. (A) is a perspective view of the bottom part of the self-supporting bag of the third embodiment and the first and second bonding members, and (B) is a perspective view of the bottom part of the arrangement and the first and second bonding members. FIG. (A) is an expanded development view of the self-supporting bag 10B before applying the heat seal HS5, and (B) is an enlarged development view of the self-supporting bag after heat sealing. It is sectional drawing which followed XIV-XIV shown in FIG.13 (B). (A), (B) is sectional drawing equivalent to FIG. 6 (A) along VIA-VIA of FIG. 2, (A) shows the structure before unfolding, (B) shows the structure after unfolding, (C ) Is a cross-sectional view corresponding to FIG. 6B along VIB-VIB of FIG. 2. It is a top view of the self-supporting bag concerning the deformation | transformation of 1st Embodiment. (A), (B) is a top view of the self-supporting bag concerning the deformation | transformation of 1st Embodiment. (A), (B) is a partial top view of the self-supporting bag before the heat seal which bonds the bottom part 12 concerning the deformation | transformation of 1st Embodiment. (A) is a cross-sectional view corresponding to FIG. 18 (A) corresponding to FIG. 6 (A), and (B) is a cross-sectional view corresponding to FIG. 6 (A) corresponding to FIG. 18 (B). (A), (B) is a partial top view of the self-supporting bag before the heat seal which bonds the bottom part 12 concerning the deformation | transformation of 2nd Embodiment. (A) is a cross-sectional view corresponding to FIG. 6 (A) corresponding to FIG. 20 (A), and (B) is a cross-sectional view corresponding to FIG. 6 (A) corresponding to FIG. 20 (B). (A), (B) is sectional drawing of the bottom part 12 and bonding member 13B, 14B concerning the deformation | transformation of 3rd Embodiment. (A) is a cross-sectional view corresponding to FIG. 6 (A) corresponding to FIG. 22 (A), and (B) is a cross-sectional view corresponding to FIG. 6 (A) corresponding to FIG. 22 (B). It is a perspective view of 10 C of self-supporting bags provided with the bottom on the bottom and the ceiling. It is the perspective view which opened 10 C of self-supporting bags of FIG. It is a perspective view of self-supporting bag 10D provided with a spout. It is a perspective view of the self-supporting bag 10E which concerns on the deformation | transformation of 1st Embodiment. It is an expansion | deployment top view of the self-supporting bag shown in FIG. It is a partial elevation view of the self-standing bag according to the prior art. (A), (B), (C) is a top view which shows the preparation methods of the bottom gusset concerning a prior art. It is sectional drawing along C1-C1 shown in FIG. It is sectional drawing along B1-B1 shown in FIG. It is a partial elevation view of the self-supporting bag showing the method of point seal.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

First Embodiment A first embodiment of the present invention will be described with reference to FIGS.

  The self-supporting bag 10 according to the first embodiment includes a trunk portion 11 as a cylindrical bag body, a bottom portion 12 that forms the bottom of the trunk portion 11, and a binder used for bonding the bottom portion 12 and the trunk portion 11. Bonding members 13 and 14, and a bonding member 15 that forms a cylindrical shape of the body portion 11.

  Next, the trunk | drum 11 is demonstrated.

  The trunk | drum 11 consists of a film-like laminated body. This laminate has at least a base material layer 111 and a sealant layer 112 (see FIG. 6). In addition, the trunk | drum 11 may use a single layer film.

  The film of the layer which comprises a laminated body is not specifically limited. The base material layer 111 is preferably a film having excellent printability and further having piercing strength, tensile strength, impact resistance, and the like. Examples thereof include a biaxially stretched film such as polyethylene terephthalate, polypropylene, polyamide, and ethylene vinyl alcohol copolymer, or a single body or a laminate of uniaxially stretched films. Moreover, in order to give oxygen and water vapor | steam barrier property to these, the base material layer 111 is a vapor deposition film which vapor-deposited metals, such as aluminum and magnesium, or oxides, such as a silicon oxide, Barrier coatings, such as a polyvinylidene chloride A coated film coated with an agent or the like may be used.

As the sealant layer 112, a heat-sealable film is used. As the sealant layer 112, for example, an unstretched film such as high-density polyethylene, low-density polyethylene, linear low-density polyethylene, or polypropylene, or a layer obtained by extruding these resins is used.
The laminated body may use an intermediate layer between the base material layer 111 and the sealant layer 112 as necessary. The intermediate layer includes a film having functionalities such as oxygen barrier property, water vapor barrier property, and tearing property depending on the use of the self-supporting bag. For the intermediate layer, for example, a metal foil such as aluminum, the above-described deposited film, or a coat film is used. When tearing in one direction is required, the intermediate layer is a film uniaxially stretched in the direction requiring tearing. The base material layer 111, the sealant layer 112, and an intermediate layer as necessary are laminated by a known method such as dry lamination using an adhesive or extrusion lamination using a heat-adhesive resin.

  The trunk | drum 11 is made into a cylinder shape by abutting the both ends 11a and 11b of the rectangular film 11A as a main body film, closing the both ends 11a and 11b using the bonding member 15 (refer FIG. 3A). Instead of using this bonding member 15, envelope bonding (see FIG. 3B) in which both side ends 11a and 11b are stacked and bonded, or the sealant layers 112 on both side ends 11a and 11b are bonded together. It is good also as sticking together (refer FIG. 3C).

  Next, the bottom 12 will be described.

  The bottom part 12 consists of a film-like laminated body. This laminate has at least a base material 121 and a sealant layer 122 (see FIG. 6). The bottom 12 may be a single layer film.

  The laminate may be the same laminate as the body 11 or a different laminate. However, the sealant layer 112 of the body portion 11 and the sealant layer 122 of the bottom portion 12 are bonded together by heat fusion. In this embodiment, it is desirable that the sealant layers 112 and 122 can be heat-bonded to each other. The same kind of resin is preferable.

  As shown in FIG. 4, the bottom 12 before unfolding is folded in half along the fold line 12a with the sealant layer 122 serving as the inner surface of the self-supporting bag 10 as the front. The bottom portion 12 has a first bottom surface portion 12b and a second bottom surface portion 12c with a fold line 12a as a boundary. Each of these first bottom surface portions 12b has an upper end as a folding line 12a, both side ends 12b1, 12b2, and a lower end 12b3. The second bottom surface portion 12c has an upper end as a folding line 12a, both side ends 12c1, 12c2, and a lower end 12c3.

  The first side ends 12b1 and 12c1 and the second side ends 12b2 and 12c2 overlap each other with the bottom 12 folded in half.

  Next, the bonding members 13, 14, and 15 will be described.

  Both surfaces of the bonding members 13, 14, and 15 have heat sealing properties. Specifically, for example, a laminate film having a sealant layer on both sides, a single layer film, and a co-extruded film can be mentioned. In this embodiment, a bonding member made of a single layer synthetic resin film is used. This is because heat is applied to the bonded member by heat sealing, so that everything can be melted in the thickness direction of the bonded member and can be thinner. Further, even when a step is generated due to the difference in the number of laminated bodies when the body 11 and the bottom 12 are bonded together, it is easy to enter the step and hardly cause a heat seal failure. For this reason, it is preferable that the material of the bonding member is the same kind of resin that can be heat-sealed with the resin of the sealant layer 112 of the body portion 11 and the sealant layer 122 of the bottom portion 12.

  Next, the self-supporting bag 10 will be described.

  As shown in FIG. 1, in the self-supporting bag 10, the bottom portion 12 is inserted inside the trunk portion 11 with the fold line 12 a facing upward, and the top portion of the self-supporting bag 10 is open. In the cylindrical trunk | drum 11, the 1st side ends 12b1 and 12c1 of the 1st and 2nd bottom face parts 12b and 12c are overlapped (refer FIG. 5 (A)). Similarly, the second side edges 12b2 and 12c2 are overlapped. As shown in FIG. 5B, in this example, the bonding member 13 overlaps the first side ends 12b1 and 12c1. It arrange | positions so that one surface of the bonding member 13 may contact | connect the 2nd bottom face part 12c and the trunk | drum 11. FIG. The bonding member 13 bonds the second bottom surface portion 12c and the body portion 11 so as to include the first side end 12c1. Further, the bonding member 14 overlaps the second side ends 12b2 and 12c2. One surface of the bonding member 14 is disposed in contact with the second bottom surface portion 12 c and the body portion 11. The bonding member 14 bonds the second bottom surface portion 12c and the body portion 11 so as to include the second side end 12c2. Thus, the bonding members 13 and 14 bond the bottom portion 12 and the body portion 11 together. Furthermore, the lower end 11c of the trunk | drum 11 and the lower ends 12b3 and 12c3 of the bottom part 12 are bonded together as a lower end coupling | bond part (refer FIG. 1).

  The manufacturing method of the self-supporting bag 10 concerning the 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 4, the bottom film 12 </ b> A forming the bottom portion 12 is folded in half at the lower end of the rectangular film 11 </ b> A constituting the body portion 11 and overlapped. At that time, the surface of the sealant layer 112 of the rectangular film 11A and the surface of the sealant layer 122 of the first bottom surface portion 12b folded in half are matched, and the lower end 11c of the rectangular film 11A and the lower end of the bottom film 12A 12b3 and 12c3 are substantially matched. The length h1 between both side ends 11a and 11b of the rectangular film 11A is set to be twice as long as the length h2 between both side ends 12b1 and 12b2 of the bottom film 12A or between both side ends 12c1 and 12c2.

  The bonding member 13 covers all of the first side ends 12b1 and 12c1 of the bottom portion 12 and crosses the first side ends 12b1 and 12c1, and the sealant layer 112 of the rectangular film 11A and the sealant of the second bottom surface portion 12c. It is arranged so as to overlap with the layer 122. Similarly, the bonding member 14 covers all of the second side ends 12b2 and 12c2 of the bottom portion 12 and crosses the second side ends 12b2 and 12c2, and the sealant layer 112 and the second bottom surface of the rectangular film 11A. It arrange | positions so that it may overlap with the sealant layer 122 of the part 12c.

  Next, the first side edges 12b1 and 12c1 of the bottom film 12A are all covered, and the rectangular film 11A, the bottom film 12A, and the bonding member 13 are bonded together by the heat seal HS1. At this time, since the sealant layers face each other, the rectangular film 11A and the first bottom surface portion 12b of the bottom film 12A are integrated by the heat seal HS1. Further, the bonding member 13 is integrated with the rectangular film 11A and the second bottom surface portion 12c of the bottom film 12A by the heat seal HS1. Therefore, the rectangular film 11A, the first and second bottom surface portions 12b, 12c of the bottom film 12A and the bonding member 13 are integrated with each other at the first side ends 12b1, 12c1 of the bottom film 12A by the heat seal HS1. The

  Similarly, the first side edges 12b2 and 12c2 of the bottom film 12A are all covered, and the rectangular film 11A, the bottom film 12A, and the bonding member 14 are bonded together by the heat seal HS2. At this time, since the sealant layers face each other, the rectangular film 11A and the first bottom surface portion 12b of the bottom film 12A are integrated by the heat seal HS2. Moreover, the bonding member 14 is integrated with the rectangular film 11A and the second bottom surface portion 12c of the bottom film 12A by the heat seal HS2. Accordingly, the rectangular film 11A, the first and second bottom surface portions 12b, 12c of the bottom portion 12 and the bonding member 14 are integrated at the second side ends 12b2, 12c2 of the bottom film 12A by the heat seal HS2. .

  In this manner, the bottom film 12A is integrated as the bottom portion 12 with the rectangular film 11A.

  Next, a cylindrical shape is formed with the rectangular film 11 </ b> A so that the surface to which the bottom portion 12 is bonded is inside, and both side ends 11 a and 11 b of the rectangular film 11 </ b> A are butted against the back surface of the self-supporting bag 10. From the sealant layer 112 side, using the bonding member 15, the side ends 11a and 11b are bonded to each other to form a bonded cylindrical body 11 by heat sealing. Note that the both ends 11a and 11b of the rectangular film 11A may be abutted together with an envelope or a palm, and the abutting location may be provided anywhere without departing from the object of the present invention. In the case of envelope pasting and joint palm pasting, the length h1 is twice the length h2 and the combined length of the pasted portions.

  Finally, the lower end 11c of the body part 11 and the lower end 12b3 of the bottom part 12 are heat-sealed by the entire length of the lower end 12b3, and the lower end 11c of the body part 11 and the lower end 12c3 of the bottom part 12 are heat-sealed by the entire length of the lower end 12c3. to paste together. Thereby, the bottom seal portion S1 (see FIG. 6B) as a lower end coupling portion is formed over the entire length of the lower end 11c of the cylindrical body portion 11 to manufacture the self-supporting bag 10 of FIG.

  If necessary, the vicinity of the bottom seal portion S1 may be removed after forming the bottom seal portion S1 so as to have a desired shape.

  Next, the effect of the self-supporting bag 10 will be described.

  The self-supporting bag 10 manufactured using the above manufacturing method takes the intermediate form of FIG. 4A when the bottom film 12A is bonded to the rectangular film 11A. FIG. 7 shows a cross-sectional view taken along the line VII-VII for the portion P2 where the rectangular film 11A and the bottom film 12A are bonded together in this form. Here, in the X2 section having the bottom film 12A, three laminates and one bonding member 13 overlap. In the Y2 section that does not have the bottom film 12A, one laminate and one bonding member are overlapped. Accordingly, the heat seal HS1 is spread over regions having different total thicknesses for the two laminated bodies. However, here, the bonding member 13 is a single-layer film having double-sided heat sealability. Not only the sealant layer 112 of the rectangular film 11A and the sealant layer 122 of the bottom film 12A, but also the bonding member 13 is melted by the heat at the time of applying the double-sided heat seal HS1, and melted to a step where a difference in total thickness occurs. Get in. Therefore, the rectangular film 11 </ b> A and the bottom film 12 </ b> A can be bonded together with no heat seal failure. When the self-supporting bag 10 is formed, a cross-sectional view corresponding to VIB-VIB shown in FIG. 2 is shown in FIG. On the back surface of the self-supporting bag 10, a gap is generated between the trunk portion 11 and the bottom portion 12, but the lower end 11 c of the trunk portion 11 and the lower ends 12 b 3 and 12 c 3 of the bottom portion 12 are sealed by the bottom seal portion S 1. The contents do not leak from the self-supporting bag 10.

  Moreover, in the self-supporting bag 10 of the present invention, there is no portion where the inner surfaces of the body portion 11 are bonded to each other except for the part P1 in FIG. Therefore, even when the self-supporting bag 10 is formed, there is no heat-seal portion with an edge standing on the side surface of the bag body made of the trunk portion 11, and even when the self-supporting bag 10 is held by hand, it is inconvenient for the hand. It does not give pleasure. In addition, even when the palm is pasted on the back side, since there is no heat seal part on the side of the free standing bag, compared to the conventional standing pouch, there is extremely discomfort when holding the free standing bag 10 by hand. Few.

  This is the same also in the location which heat-seal HS2 of the bonding member 14 is performed.

  Further, among the bottom seal portion S1 for bonding the lower end 11c of the body portion 11 and the lower ends 12b3 and 12c3 of the bottom portion 12, a side sectional view on the side where the bonding member 13 is used (in the VIA-VIA shown in FIG. 2) A sectional view taken along the line is as shown in FIG. In the X1 section where the bonding members 13 overlap, the four laminated bodies and the two bonding members overlap, and in the Y1 section where the bonding members 13 do not overlap, the four stacked bodies overlap. Therefore, the heat sealing of the bottom seal portion S1 is performed across regions having different total thicknesses of the two laminated members. However, the bonding member 13 has heat sealability on both sides. For this reason, not only the sealant layer 112 of the trunk portion 11 and the sealant layer 122 of the bottom portion 12 but also the bonding member 13 is melted by the heat sealing of the bottom seal portion S1, and the step is caused by entering the steps having different total thicknesses. The gap is filled. Therefore, the self-supporting bag 10 is unlikely to cause a heat seal failure, and the contents do not leak even after the contents are filled.

  This also applies to the side portion on the side where the bonding member 14 is used in the bottom seal portion S1.

  Note that the manufacturing method according to the present embodiment is easiest as compared with the other embodiments.

Second Embodiment A second embodiment will be described with reference to FIGS.

  The self-supporting bag 10 </ b> A forms a trunk portion 11, a bottom portion 12 that forms the bottom of the trunk portion 11, bonding members 13 </ b> A and 14 </ b> A, and a cylindrical shape of the trunk portion 11 for bonding the bottom portion 12 and the trunk portion 11. The bonding member 15 is used. In addition, regarding the trunk | drum 11, the bottom part 12, and the bonding member 15, it is the same as that of 1st Embodiment. The bonding members 13A and 14A are the same material as the bonding members 13 and 14 of the first embodiment.

  Similar to the self-supporting bag 10 shown in FIG. 1, the self-supporting bag 10A has a bottom 12 inserted inside the trunk 11 with the fold line 12a facing upward, and the top of the self-supporting bag 10A is open. In the cylindrical trunk | drum 11, the 1st side ends 12b1 and 12c1 of the 1st and 2nd bottom face parts 12b and 12c are piled up. Similarly, the second side ends 12b2 and 12c2 are overlapped. As shown in FIG. 8, in this example, the bonding member 13A has a fold line 13A3 in the left-right direction, and is partitioned into first and second bonding portions 13A1 and 13A2 by the fold line 13A3. The bonding member 13A includes a first bonding portion 13A1 on the outer side of the first bottom surface portion 12b and a second bonding surface at the first side ends 12b1 and 12c1 of the first and second bottom surface portions 12b and 12c. The mating portion 13A2 is disposed so as to sandwich the bottom portion 12 from the upper end side of each bottom surface portion 12b and 12c, that is, the fold line 12a side of the bottom portion 12 so as to be disposed outside the second bottom surface portion 12c.

  Similarly, the bonding member 14A has a fold line 14A3 in the left-right direction, and is partitioned into first and second bonding portions 14A1 and 14A2 by the fold line 14A3. The bonding member 14A includes a first bonding portion 14A1 on the outer side of the first bottom surface portion 12b and a second bonding surface at the second side ends 12b2 and 12c2 of the first and second bottom surface portions 12b and 12c. The mating portion 14A2 is disposed so as to sandwich the bottom portion 12 from the upper end side of each bottom surface portion 12b and 12c, that is, the fold line 12a side of the bottom portion 12 so as to be disposed outside the second bottom surface portion 12c.

  At both ends of the bottom portion 12, the first bonding portions 13 </ b> A <b> 1 and 14 </ b> A <b> 1 bond the first bottom surface portion 12 b and the trunk portion 11, thereby bonding the bottom portion 12 and the trunk portion 11.

  Furthermore, the lower end 11c of the trunk | drum 11 and the lower ends 12b3 and 12c3 of the bottom part 12 are bonded together as a lower end coupling part.

  A method for manufacturing the self-supporting bag 10A according to the second embodiment of the present invention will be described. As shown in FIG. 8, at the first side ends 12b1 and 12c1 of the bottom film 12A constituting the bottom portion 12, the first and second bottom surfaces cover all the first side ends 12b1 and 12c1 of the bottom film 12A. The pasting member 13A is placed on both outer sides of the portions 12b and 12c. Specifically, the bonding member 13A is bent at a fold line 13A3 in the left-right direction, and disposed so as to sandwich the bottom film 12A from the upper end side of the bottom film 12A, that is, the fold line 12a side of the bottom film 12A. At this time, the bonding member 13A is partitioned by the fold line 13A3, and the portion disposed outside the first bottom surface portion 12b is the portion disposed outside the first bonding portion 13A1 and the second bottom surface portion 12c. Is a second bonding portion 13A2.

  Similarly, on the second side ends 12b2 and 12c2 of the bottom film 12A, outside the first and second bottom surface portions 12b and 12c so as to cover all the second side ends 12b2 and 12c2 of the bottom film 12A. Then, the bonding members 14A are arranged so as to overlap each other. Specifically, the bonding member 14A is bent at a fold line 14A3 in the left-right direction, and arranged so as to sandwich the bottom 12 from the upper end side of the bottom film 12A, that is, the fold line 12a side of the bottom film 12A. At this time, the bonding member 14A is partitioned by the fold line 14A3, and the portion disposed outside the first bottom surface portion 12b is the portion disposed outside the first bonding portion 14A1 and the second bottom surface portion 12c. Is a second bonding portion 14A2.

  Thereafter, as shown in FIG. 9A, the bottom film 12A folded in half is overlapped on the lower end of the rectangular film 11A constituting the body portion 11. At that time, the surface of the sealant layer 112 of the rectangular film 11A and the surface of the sealant layer 122 of the first bottom surface portion 12b are matched. Further, the lower end portion of the rectangular film 11A and the lower ends 12b3 and 12c3 of the bottom film 12A are substantially matched. The length h1 between both side ends 11a and 11b of the rectangular film 11A is set to be twice as long as the length h2 between both side ends 12b1 and 12b2 of the bottom film 12A or between 12c1 and 12c2.

  Next, as shown in FIG. 9B, the first side edges 12b1 and 12c1 of the bottom film 12A are all covered, and the rectangular film 11A, the bottom film 12A, and the bonding member 13A are bonded together by a heat seal HS3. At this time, the sealant layers of the rectangular film 11A, the first bonding portion 13A1, and the first bottom surface portion 12b of the bottom film 12A face each other, and are integrated by the heat seal HS3. Further, the second bonding portion 13A2 is integrated with the first bonding portion 13A1 integrated with the rectangular film 11A and the second bottom surface portion 12c of the bottom film 12A by the heat seal HS3. Accordingly, the first and second bottom surface portions 12b and 12c of the rectangular film 11A and the bottom film 12A and the bonding member 13A are integrated by the heat seal HS3.

  Similarly, the second side edges 12b2 and 12c2 of the bottom film 12A are all covered, and the rectangular film 11A, the bottom film 12A, and the bonding member 14A are bonded together by the heat seal HS4. At this time, the sealant layers of the rectangular film 11A, the first bonding portion 14A1, and the first bottom surface portion 12b of the bottom film 12A face each other and are integrated by the heat seal HS4. Further, the second bonding portion 14A2 is integrated with the first bonding portion 14A1 integrated with the rectangular film 11A and the second bottom surface portion 12c of the bottom film 12A by the heat seal HS4. Accordingly, the first and second bottom surface portions 12b and 12c of the rectangular film 11A and the bottom film 12A and the bonding member 14A are integrated by the heat seal HS4.

  In this manner, the bottom film 12A is integrated as the bottom portion 12 with the rectangular film 11A.

  Thereafter, the self-supporting bag 10 </ b> A is produced in the same manner as the self-supporting bag 10.

  Next, the effect of the self-supporting bag 10A will be described.

  The self-supporting bag 10A produced using the above manufacturing method takes the intermediate form shown in FIG. 9 when the bottom film 12A is bonded to the rectangular film 11A. In this form, the rectangular film 11A and the bottom film 12A are bonded together. FIG. 10 is a cross-sectional view taken along the line XX for the part P3 in FIG. Here, in the X3 section having the bottom film 12A, three laminated bodies and two bonding members are overlapped. The Y3 section that does not have the bottom film 12A is a single laminate. Accordingly, the heat seal HS3 is spread over regions having different total thicknesses corresponding to two sheets of the laminated body and two sheets of the bonding member. However, here, the bonding member 13A is a film having double-sided heat sealability. Not only the sealant layer 112 of the rectangular film 11A and the sealant layer 122 of the bottom film 12A, but also the bonding member 13A is melted by the heat at the time of applying the heat seal HS3, and melts and enters the step where a difference in total thickness occurs. . Therefore, the rectangular film 11A and the bottom film 12A can be bonded together without any heat seal failure. When the self-supporting bag 10A is formed, a cross-sectional view corresponding to the cross-sectional view along VIB-VIB of FIG. 2 is shown in FIG. 11B. There is a gap between them, but the lower end 11c of the body 11 and the lower ends 12b3 and 12c3 of the bottom 12 are sealed by the bottom seal portion S2 as the lower end coupling portion, so that the content leaks from the self-supporting bag 10A. There is no.

  Moreover, in the self-supporting bag 10A of the present invention, there is no portion where the inner surfaces of the trunk portion 11 are bonded to each other except for the part P4 in FIG. For this reason, even when the self-supporting bag 10A is formed, there is no heat-sealed portion with an edge on the side surface of the bag body made of the trunk portion 11, and even when the self-supporting bag 10A is held by hand, it is inconvenient for the hand. It does not give pleasure. Moreover, even when the palm is pasted on the back, since there is no heat seal part on the side of the free standing bag, there is very little discomfort when holding the free standing bag 10A by hand, compared to a conventional standing pouch. .

  This is the same also in the location which heat-bonds HS4 of the bonding member 14A.

  Further, of the bottom seal portion S2 for bonding the lower end 11c of the body portion 11 and the lower ends 12b3 and 12c3 of the bottom portion 12, a side sectional view on the side where the bonding member 13A is used (see VIA-VIA in FIG. 2). (Corresponding to a sectional view taken along the line) is as shown in FIG. In the X4 section where the bonding member 13A overlaps, the four laminates and the four bonding members overlap. In the Y4 section where the bonding member 13A does not overlap, the four laminated bodies overlap. Therefore, the heat sealing of the bottom seal portion S2 is performed across regions having different total thicknesses for the four bonded members. However, the bonding member 13A has heat sealing properties on both sides. For this reason, not only the sealant layer 112 of the trunk portion 11 and the sealant layer 122 of the bottom portion 12 but also the bonding member 13A is melted by heat sealing of the bottom seal portion S2, and a gap is generated by entering a step having a different total thickness. Is buried. Therefore, the self-supporting bag 10A is unlikely to cause a heat seal failure, and the contents do not leak even after the contents are filled.

  The same applies to the side portion of the bottom seal portion S2 on the side where the bonding member 14A is used.

  In the self-supporting bag 10A according to the present embodiment, since the bonding members 13A and 14A are disposed outside both the bottom surface portions 12b and 12c, the leakage of the contents can be further prevented.

Third Embodiment A third embodiment of the present invention will be described with reference to FIGS.

  The self-supporting bag 10 </ b> B includes a trunk portion 11, a bottom portion 12 that forms the bottom of the trunk portion 11, bonding members 13 </ b> B and 14 </ b> B that bond the bottom portion 12 and the trunk portion 11, and a bonding that forms a cylindrical shape of the trunk portion 11. The member 15 is used. In addition, regarding the trunk | drum 11, the bottom part 12, and the bonding member 15, it is the same as that of 1st, 2nd embodiment. The bonding members 13B and 14B are made of the same material as the bonding members 13 and 14 of the first embodiment and the bonding members 13A and 14A of the second embodiment.

  Similar to the self-supporting bag 10 shown in FIG. 1, the self-supporting bag 10B has a bottom 12 inserted inside the trunk 11 with the fold line 12a facing upward, and the top of the self-supporting bag 10B is open. In the cylindrical trunk | drum 11, the 1st side ends 12b1 and 12c1 of the 1st and 2nd bottom face parts 12b and 12c are piled up. Similarly, the second side ends 12b2 and 12c2 are overlapped. As shown in FIG. 12, in this example, the bonding member 13B has a fold line 13B1 in the vertical direction, and is divided into first and second bonding portions 13B2 and 13B3 by the fold line 13B1. The bonding member 13B includes a first bonding portion 13B2 on the outer side of the first bottom surface portion 12b and a second bonding surface at the first side ends 12b1 and 12c1 of the first and second bottom surface portions 12b and 12c. The mating portion 13B3 is disposed so as to sandwich the bottom portion 12 from the left end side of each bottom surface portion 12b and 12c, that is, from the first side end portions 12b1 and 12c1 side, so as to be disposed outside the second bottom surface portion 12c. Has been.

  Similarly, the bonding member 14B has a fold line 14B1 in the vertical direction, and is divided into first and second bonding portions 14B2 and 14B3 by the fold line 14B1. The bonding member 14B includes a first bonding portion 14B2 on the outer side of the first bottom surface portion 12b and a second bonding surface at the second side ends 12b2 and 12c2 of the first and second bottom surface portions 12b and 12c. The mating portion 14B3 is disposed so as to sandwich the bottom portion 12 from the right end side of each bottom surface portion 12b and 12c, that is, from the second side end portions 12b2 and 12c2 side, so as to be disposed outside the second bottom surface portion 12c. Has been.

  At both ends of the bottom portion 12, the first bonding portions 13 </ b> B <b> 2 and 14 </ b> B <b> 2 are bonded to each other by bonding the first bottom surface portion 12 b and the trunk portion 11.

  Furthermore, the lower end 11c of the trunk | drum 11 and the lower ends 12b3 and 12c3 of the bottom part 12 are bonded together as a lower end coupling part.

  Next, a method for manufacturing the self-supporting bag 10B according to the third embodiment of the present invention will be described.

  As shown in FIG. 12, both the first and second bottom surface portions 12b and 12c cover all the side ends 12b1 and 12c1 of the bottom film 12A at the side ends 12b1 and 12c1 of the bottom film 12A constituting the bottom portion 12. The laminated member 13B is placed on the outside of the sheet. Specifically, the laminating member 13B is bent at the folding line 13B1 in the vertical direction so that the bottom film 12A folded in half from the left end side of the bottom portion 12, that is, the first side end portions 12b1 and 12c1 side, is sandwiched. Deploy. At this time, the bonding member 13B is partitioned by the fold line 13B1, and a portion disposed outside the first bottom surface portion 12b is a portion disposed outside the first bonding portion 13B2 and the second bottom surface portion 12c. Is a second bonding portion 13B3.

  Similarly, the side edges 12b2 and 12c2 of the bottom film 12A constituting the bottom 12 are attached to the outside of both the first and second bottom faces 12b and 12c so as to cover all the side edges 12b2 and 12c2 of the bottom film 12A. The alignment members 14B are arranged so as to overlap each other. Specifically, the laminating member 14B is bent at a fold line 14B1 in the vertical direction so as to sandwich the bottom film 12A folded in half from the right end side of the bottom portion 12, that is, from the second side end portions 12b2 and 12c2 side. Deploy. At this time, the bonding member 14B is partitioned by the fold line 14B1, and a portion disposed outside the first bottom surface portion 12b is a portion disposed outside the first bonding portion 14B2 and the second bottom surface portion 12c. Is a second bonding portion 14B3.

  Thereafter, as shown in FIG. 13A, the bottom film 12A constituting the bottom portion 12 folded in half is stacked on the lower end of the rectangular film 11A constituting the body portion 11. At that time, the surface of the sealant layer 112 of the rectangular film 11A and the surface of the sealant layer 122 of the first bottom surface portion 12b are matched. Further, the lower end 11c of the rectangular film 11A and the lower ends 12b3 and 12c3 of the bottom film 12A are substantially matched. The length h1 between both side ends 11a and 11b of the rectangular film 11A is set to be twice as long as the length h2 between both side ends 12b1 and 12b2 of the bottom film 12A or between 12c1 and 12c2.

  Next, the first side edges 12b1 and 12c1 of the bottom film 12A are all covered, and the rectangular film 11A, the bottom film 12A, and the bonding member 13B are bonded together by the heat seal HS5. At this time, the sealant layers of the rectangular film 11A, the first bonding portion 13B2, and the first bottom surface portion 12b of the bottom film 12A face each other and are integrated by the heat seal HS5. The second bonding portion 13B3 is continuous with the first bonding portion 13B2, and is integrated with the second bottom surface portion 12c of the bottom film 12A by the heat seal HS5. Accordingly, the first and second bottom surface portions 12b and 12c of the rectangular film 11A and the bottom film 12A and the bonding member 13B are integrated by the heat seal HS5.

  Similarly, the second side edges 12b2 and 12c2 of the bottom film 12A are all covered, and the rectangular film 11A, the bottom film 12A, and the bonding member 14B are bonded together by the heat seal HS6. At this time, the sealant layers of the rectangular film 11A, the first bonding portion 14B2, and the first bottom surface portion 12b of the bottom film 12A face each other and are integrated by the heat seal HS6. The second bonding portion 14B3 is continuous with the first bonding portion 14B2, and is integrated with the second bottom surface portion 12c of the bottom film 12A by the heat seal HS6. Accordingly, the first and second bottom surface portions 12b and 12c of the rectangular film 11A and the bottom film 12A and the bonding member 14B are integrated by the heat seal HS6.

  In this manner, the bottom film 12A is integrated as the bottom portion 12 with the rectangular film 11A.

  Thereafter, the self-supporting bag 10B is produced in the same manner as the self-supporting bags 10 and 10A.

  Next, the effect of the self-supporting bag 10B will be described.

  The self-supporting bag 10B manufactured using the above manufacturing method takes the intermediate form shown in FIG. 13 when the bottom 12 is bonded to the rectangular film 11A. FIG. 14 shows a cross-sectional view taken along the line XIV-XIV for a part P5 in FIG. 13B where the rectangular film 11A and the bottom film 12A are bonded together in this form. Here, in the X5 section having the bottom, three laminated bodies and two bonding members are overlapped. In the Y5 section having no bottom, one laminate and two bonding members are overlapped. Therefore, the heat seal HS5 is spread over regions having different total thicknesses for the two laminated bodies. However, here, the bonding member 13B is a film having heat sealability on both sides. Not only the sealant layer 112 of the rectangular film 11A and the sealant layer 122 of the bottom 12 but also the bonding member 13B is melted by the heat at the time of applying the heat seal HS5, and melts and enters the step where the difference in total thickness occurs. Therefore, the rectangular film 11A and the bottom film 12A can be bonded together without any heat seal failure. When the self-supporting bag 10B is formed, a cross-sectional view corresponding to a cross-sectional view along VIB-VIB of FIG. 2 is as shown in FIG. On the back surface of the self-supporting bag 10B, a gap is formed between the trunk portion 11 and the bottom portion 12, but the lower end 11c of the trunk portion 11 and the lower ends 12b3 and 12c3 of the bottom portion 12 are sealed by a bottom seal portion S3 as a lower end coupling portion. Therefore, the contents do not leak from the self-supporting bag 10B.

  Further, in the self-supporting bag 10B of the present invention, there is no portion where the inner surfaces of the body portion 11 are bonded to each other except for the part P6 in FIG. Therefore, even when the self-supporting bag 10B is formed, there is no heat-seal portion with an edge on the side surface of the bag body made of the trunk portion 11, and even when the self-supporting bag 10B is held by hand, it is inconvenient for the hand. It does not give pleasure. In addition, even when the palm is pasted on the back side, since there is no heat seal part on the side of the free standing bag, compared to the conventional standing pouch, the discomfort when holding the free standing bag 10B by hand is extremely high. Few.

  This is the same also in the location which heat-seal HS6 of the bonding member 14B.

  Further, in the bottom seal portion S3 for bonding the lower end 11c of the body portion 11 and the lower ends 12b3 and 12c3 of the bottom portion 12, a side sectional view on the side using the bonding member 13B (along VIA-VIA in FIG. 2). (Corresponding to the cross-sectional view) is as shown in FIGS. In the X6 section where the bonding members 13B overlap, the four laminates and the two bonding members overlap, and in the Y6 section where the bonding members 13B do not overlap, the four stacks overlap. Therefore, the heat seal of the bottom seal portion S3 is performed across the regions having different total thicknesses for the two bonded members. However, the bonding member 13B has heat sealability on both sides. For this reason, not only the sealant layer 112 of the body part 11 and the sealant layer 122 of the bottom part 12 but also the bonding member 13B is melted by the heat sealing of the bottom seal part S3, and a step is generated by entering the steps having different total thicknesses. The gap to be filled is filled. Therefore, the self-supporting bag 10B is unlikely to cause a heat seal failure, and the contents do not leak even after the contents are filled.

  The same applies to the side portion of the bottom seal portion S3 on the side where the bonding member 14B is used.

  In the self-supporting bag 10B according to the present embodiment, since the bonding members 13B and 14B are arranged outside both the bottom surface portions 12b and 12c, the leakage of the contents can be further prevented.

1st modification The modification of a bottom seal part is shown below. When the self-supporting bag 10 is provided with a bottom seal portion, it is preferable to provide an arc-shaped seal portion 17 that partially bonds the body portion 11 and the bottom portion 12 of the self-supporting bag 10 (see FIG. 16). By matching the arc-shaped seal portion 17 with the opening of the bottom portion 12, the self-standing bag 10 is self-supporting in a good shape. Moreover, since the strength of the bottom portion is increased, it is excellent in self-supporting property and shape retention.

  When the bottom seal portion of the self-supporting bag 10 of the present invention is the arc-shaped seal portion 17, the upper end of the arc-shaped seal portion 17 is provided so as to coincide with or be lower than the upper ends of the bonding members 13 and 14. . Furthermore, it is preferable that the upper end of the arc-shaped seal portion 17 is provided so as to coincide with or be below the fold line 12a of the bottom portion 12. Conversely, when the arc-shaped seal portion 17 is provided so that the upper end of the arc-shaped seal portion 17 is higher than the upper ends of the bonding members 13 and 14, the inner surfaces of the body portion 11 are directly bonded to each other at the portion P7 in FIG. This is because it causes discomfort when held by hand. Further, when the upper end of the arc-shaped seal portion 17 is provided below the upper ends of the bonding members 13 and 14 and above the fold line 12a of the bottom portion 12, the bonding members 13 and 14 are heated on both sides at a site P7 in FIG. Since it has a sealing property, the bonding members 13, 13, 14, 14 facing each other are bonded together, and in this case, a loose edge is also formed. In this case as well, there is a risk of giving some discomfort when held by hand. Therefore, when the arc-shaped seal portion 17 is provided so that the upper end of the arc-shaped seal portion 17 coincides with or falls below the fold line 12a of the bottom portion 12, the inner surfaces of the body portion 11 and the bonding members 13 and 13 in P7 of FIG. 14, 14 and 14 are not bonded to each other, no edge is formed, and no uncomfortable feeling is given to the hand.

  According to the manufacturing method of the self-supporting bag 10 of the present invention, even when the bottom seal portion is the arc-shaped seal portion 17, the body portion 11 and the bottom portion 12 are bonded together before the bottom seal portion is applied. Therefore, even if the upper end of the arc-shaped seal portion 17 is provided below the fold line 12a of the bottom portion 12, the contents will not leak. Similarly, instead of the arc-shaped seal portion 17, a trapezoidal seal portion 17A as shown in FIG. 17A or a triangular seal portion 17B as shown in FIG. 17B may be used.

  On the other hand, in the self-supporting bag of the prior art document 1 shown in FIG. 27, the bottom gusset 22 corresponding to the bottom portion of the present invention and the flat tube 21 corresponding to the trunk portion of the present invention are bonded together at the bottom heat seal portion S21. Yes. For this reason, as shown in FIG. 27, unless the upper end of the bottom heat seal portion S21 protrudes slightly from the upper end of the bottom gusset 22, the contents leak from the self-supporting bag. For this reason, the upper end of the bottom heat seal portion S21 is always provided in a form protruding slightly from the upper end of the bottom gusset 22. For this reason, in the self-supporting bag of the prior art document 1, the inner surfaces of the flat tubes 21 are bonded to each other at the portion A1 in FIG.

  The same effect can be obtained by forming the arc-shaped seal part 17, the trapezoidal seal part or the triangular seal part in the self-supporting bag 10A and the self-supporting bag 10B.

Second Modification A modification of the arrangement of the bonding members 13 and 14 is shown below. In the self-supporting bag 10, the bonding members 13 and 14 are bent when the self-supporting bag 10 is formed in a cylindrical shape, and the left and right edges may not be aligned and may be shifted (FIG. 18 ( A), (B)). Thereby, among the bottom seal part S1 for bonding the lower end 11c of the body part 11 and the lower ends 12b3 and 12c3 of the bottom part 12, a side sectional view of the side using the bonding member 13 (cross section VIA-VIA in FIG. 2). FIG. 19 (A) or FIG. 19 (B) is equivalent to FIG. In this form, in the X7 section, four laminated bodies and two bonding members overlap. In the Y7 section, four laminates and one bonding member overlap. In the Z7 section, four laminated bodies overlap. The heat seal of the bottom seal portion S1 is performed across the X7 section, the Y7 section, and the Z7 section. Therefore, the heat sealing is performed by changing the number of bonding members by one sheet and extending over regions where the total thickness is gradually different. Thereby, it is hard to generate | occur | produce a heat seal defect more, and even after filling the content in the self-supporting bag 10, a content does not leak.

  Similarly, in the self-standing bag 10A, the bonding members 13A and 14A are bent when the self-standing bag 10A is formed into a cylindrical shape, and the left and right edges may be shifted without being aligned ( FIG. 20). Thereby, among the bottom seal part S2 which bonds the lower end 11c of the trunk | drum 11 and the lower ends 12b3 and 12c3 of the bottom part 12, side sectional drawing of the side using the bonding member 13A (in the VIA-VIA of FIG. 2). (Corresponding to the sectional view taken along) is as shown in FIG. 21 (A) or FIG. 21 (B). In this form, in the X8 section, four laminated bodies and four bonding members are overlapped. In the Y8 section, the four laminates and the two bonding members overlap. In the Z8 section, four laminated bodies overlap. The heat seal of the bottom seal portion S2 is performed across the X8 section, the Y8 section, and the Z8 section. Accordingly, in the heat seal, the bonding members are different by two sheets, and the total thickness is gradually spread over different areas, so that the level difference is eased. Thereby, it is hard to generate | occur | produce a heat seal defect more, and even after filling the self-supporting bag 10A with a content, a content does not leak.

  In the self-supporting bag 10B, in a state where the bonding members 13B and 14B are bent, the left and right edges may not be coincident and may be shifted (see FIG. 22). Thereby, among the bottom seal part S3 which bonds the lower end 11c of the trunk | drum 11 and the lower ends 12b3 and 12c3 of the bottom part 12, side sectional drawing by the side using the bonding member 13B (in VIA-VIA of FIG. 2). (Corresponding to a sectional view taken along the line) is as shown in FIG. 23 (A) or 23 (B). In this form, in the X9 section, the four laminated bodies and the two bonding members are overlapped. In the Y9 section, four laminates and one bonding member overlap each other. In the Z9 section, four laminated bodies are overlapped. The heat sealing of the bottom seal portion S3 is performed across the X9 section, the Y9 section, and the Z9 section. Therefore, the heat sealing is performed by changing the number of bonding members by one sheet and extending over regions where the total thickness is gradually different. Thereby, it is hard to generate | occur | produce a heat seal defect more, and even after filling the content in the self-supporting bag 10B, the content does not leak.

Third Modification In the self-supporting bag 10, the height h3 excluding the bottom seal portions S1 of the bottom surface portions 12b and 12c of the bottom portion 12 may be half of the width h4 when the self-supporting bag 10 is folded (FIG. 4A). )reference). This is because when the self-supporting bag 10 is self-supported, the opening of the bottom portion 12 in the direction perpendicular to the width direction of the self-supporting bag 10 is developed to the same length as the width direction of the bottom portion 12. This is because the independence of the bag 10 is improved. Moreover, by making the bottom seal part S1 into the arc-shaped seal part 17, the bottom part 12 is developed into a perfect circle, and the self-supporting property of the self-supporting bag 10 is further improved. Furthermore, by making the bottom seal part a triangular seal part, the bottom part 12 is developed into a square shape and the self-supporting property is improved.

  Similarly, in the self-supporting bags 10A and 10B, the height h3 excluding the bottom seal portions S2 and S3 of the bottom surface portions 12b and 12c of the bottom portion 12 is half the width h4 when the self-supporting bags 10A and B are folded. A similar effect can be obtained.

Fourth Modification In the self-supporting bag 10, the length h5 of the bonding members 13 and 14 is set to the same length as the height h6 of the trunk portion 11 and extends from the upper end to the lower end of the trunk portion 11. Further, heat sealing HS1 and HS2 are performed over the entire length of the bonding members 13 and 14 (see FIG. 4B). Thereby, the both sides of the self-supporting bag 10 have the width | variety of the bonding member 13 or 14 by the bonding members 13 and 14 and heat seal HS1 and HS2. For this reason, the top part of the self-supporting bag 10 is easy to open, and since it is excellent in shape retention, it is excellent also in self-supporting property.

  The same effect is acquired by making the length of the bonding members 13B and 14B of the self-supporting bag 10B the same length as the height of the trunk portion 11.

5th modification In the self-supporting bag 10, the container 10C of the up-and-down object is formed by providing the member similar to the bottom part 12 also in the top part of the self-supporting bag 10 (refer FIG. 24). The container 10C has good self-supporting property and can be stacked vertically.

  Moreover, it can utilize like a tray by tearing the part which bonds the side ends 11a and 11b of the trunk | drum 11, and peeling the bonding member 15. FIG. In order to peel off the bonding member 15, the bonding member 15 may use an easy peel film. FIG. 25 shows a view of the side edges 11a and 11b cut away.

  Similarly, the same effect can be obtained by providing the bottom portion 12 at the upper end of the self-supporting bag 10A and the self-supporting bag 10B as well.

  Moreover, the shape of a bonding member may differ in a bottom part and a top part.

6th deformation | transformation form In the self-supporting bag 10, it becomes container 10D with a pouring part by using the pouring part 16 at the top part of the trunk | drum 11 (refer FIG. 26). In many cases, the container 10D is filled with a liquid or fluid such as a beverage, shampoo, rinse, or soap as a content. It is convenient when carrying beverages and using shampoos, rinses, soaps, etc., because it does not cause discomfort when held by hand. Similarly, you may provide the extraction | pouring part 16 in the self-supporting bag 10A, 10B.
Moreover, the extraction | pouring part 16 is not restricted to a top part, You may provide in any position of a trunk | drum.

Seventh Modification As shown in FIG. 27, a self-standing bag 10E according to this modification includes a bonding member 14 and a bonding member 15 that join the body 11 and the bottom 12 of the self-standing bag 10. It is the same as the self-supporting bag 10 except that it is a single member. That is, the first side ends 12b1 and 12c1 of the bottom portion 12 and the barrel portion 11 are coupled by the bonding member 14 and are coupled so as to close both side ends 11a and 11b of the rectangular film 11A. It is formed in a cylindrical shape. Therefore, since the joining part of the trunk | drum 11 of the self-supporting bag 10E is formed in the vicinity of the side end of the self-supporting bag, it is possible to design on the whole surface of the trunk | drum 11, it is easy to give a design to the trunk | drum 11, and it looks Also good. Note that the bonding member 13 and the bonding member 15 may be one member instead of the bonding member 14.

Next, a method for manufacturing the self-supporting bag 10E will be described.
In manufacturing the self-supporting bag 10E, in order to make the bonding member 14 and the bonding member 15 in the self-supporting bag 10 as one member, the rectangular film 11A of the self-supporting bag and the side edges 11b, 12b2, and 12c2 of the bottom film 12A are joined together. If they match, the free standing bag 10E is not formed.

  As shown in FIG. 28 (B), the bottom film 12A is positioned slightly inside the side end 11b of the rectangular film 11A. As shown in FIG. 2A, a single bonding member 14 is disposed so as to cover both the second side edges 12b2 and 12c2 of the bottom film 12A and the side edges 11b of the rectangular film 11A. The laminating member 13 is disposed so as to cover the first side edges 12b1 and 12c1 of the bottom film in the same manner as the self-supporting bag 10.

  Next, both end portions 11a and 11b of the rectangular film 11A are abutted, and the second side ends 12b2 and 12c2 of the bottom film 12A are covered with respect to the position of the bonding member 14, and both end portions of the rectangular film 11A are covered. Heat seal HS8 is performed so as to cover all the portions 11a and 11b. As a result, the second side edges 12b2 and 12c2 of the bottom film 12A, the rectangular film 11A, and the bonding member 14 are integrated, and the side edges 11a and 11b of the rectangular film 11A and the bonding member 14 are integrated. To form a cylindrical body 11 from the rectangular film 11A. In addition, the second side ends 12b1 and 12c1 of the bottom film 12A and the rectangular film 11A are integrated with respect to the position of the bonding member 13.

  Finally, the bottom seal portion S4 is formed by heat sealing similarly to the self-supporting bag 10, and the self-supporting bag 10E is manufactured.

  According to this form, since the bonding member 15 which joins the side edges 11a and 11b of the rectangular film 11A is not necessary, the number of members and the number of steps can be omitted, and thus the manufacturing cost can be reduced. .

  Each embodiment and each modification of the present invention can be modified or changed within the scope of the gist of the invention. For example, instead of heat sealing, the first and second bonding members 13 and 14 may be bonded to the body 11 or the bottom 12 using an adhesive.

  Moreover, the side edge of the bottom part 12 may be closed beforehand. Specific examples include those closed by a fusing seal and those closed by folding. Further, the bottom 12 may be one in which two members are joined on one side. The combined one side may be the upper end of the bottom, and the one side may protrude toward the inside of the self-standing bag or may protrude toward the outside.

  Furthermore, the bottom portion 12 may have a cylindrical shape such as an inflation tube. In that case, one open end is combined, and the combined open end is the upper end of the bottom. The joined open end may protrude in the inner direction of the self-supporting bag or may protrude in the outer direction.

  Furthermore, the shape of the bonding member in the present invention may be different at the first side end and the second side end of the bottom.

10, 10A, 10B Self-supporting bag 11 Body 11A Rectangular film 12 Bottom 13, 13A, 13B First bonding member 14, 14A, 14B Second bonding member

Claims (16)

A cylindrical body as a bag body;
A self-standing bag consisting of a bottom part folded in two along a fold line, which is provided inside the cylindrical body part while closing one opening of the body part,
The barrel portion has a cylindrical shape by bonding both ends of a rectangular film,
The bottom portion is partitioned into first and second bottom surface portions with the fold line as an upper end, and each bottom surface portion has left and right side ends orthogonal to the fold line and a lower end parallel to the fold line,
The bottom portion is a self-supporting bag that is coupled by a binding material that couples the bottom surface portion and the body portion at a side end of the bottom portion, and is coupled to the body portion at the lower end. The binding material is arranged so as to cover all the side edges of the bottom surface of one of the first and second,
2. The self-supporting bag according to claim 1, wherein the binding material joins one of the first and second bottom portions and the trunk portion. The binding material is arranged so as to cover all the side edges of both the first and second bottom surface portions,
The binding material includes a first coupling portion disposed outside the first bottom surface portion, and a second coupling portion disposed outside the second bottom surface portion,
The first coupling portion couples the first bottom surface portion and the body portion,
The self-supporting bag according to claim 1, wherein the second coupling portion is continuous with the first coupling portion and couples the first coupling portion and the second bottom surface portion. The first and second coupling parts are made of one coupling material having a fold line in the left-right direction, and are partitioned into the first and second coupling parts by the fold line,
The self-supporting bag according to claim 3, wherein at the side ends of the first and second bottom surface portions, the bottom portion is disposed so as to sandwich the bottom portion from the upper end side of each bottom surface portion. The first and second coupling parts are made of one coupling material having a fold line in the vertical direction, and are divided into first and second coupling parts by the fold line,
The self-supporting bag according to claim 3, wherein at the side ends of the first and second bottom surface portions, the bottom portion is disposed so as to sandwich the bottom portion from the side end side of each bottom surface portion.   6. A length obtained by removing a length of a lower end coupling portion from a length between a folding line of the bottom portion and a lower end of the bottom portion is a half of a length between both side ends of the bottom portion. A self-supporting bag according to any one of the above.   The self-supporting bag according to any one of claims 1 to 3, 5, and 6, wherein the binding material extends from a lower end to an upper end of the trunk portion. The other opening of the barrel is closed at the top of the same shape as the bottom;
The self-supporting bag according to any one of claims 1 to 7.   The self-supporting bag according to any one of claims 1 to 8, wherein a spout is attached to the trunk portion.   The self-standing bag according to any one of claims 1 to 9, wherein the left and right side edges of the binding material are not aligned and are displaced in a folded state. A cylindrical body as a bag body;
While closing one opening of the trunk part, provided in the cylindrical trunk part, a self-standing bag consisting of a bottom part in which two members are joined on one side,
The barrel portion has a cylindrical shape by bonding both ends of a rectangular film,
The bottom portion is divided into first and second bottom surface portions with the combined one side as an upper end, and each bottom surface portion is parallel to the left and right side ends orthogonal to the combined one side and the combined one side. Having a lower end,
The bottom portion is a self-supporting bag that is coupled by a binding material that couples the bottom surface portion and the body portion at a side end of the bottom portion, and is coupled to the body portion at the lower end. A cylindrical body as a bag body;
A self-supporting bag comprising a bottom portion to which one open end of a tubular body is coupled, which is provided inside the tubular body portion and closes one opening of the body portion,
The barrel portion has a cylindrical shape by bonding both ends of a rectangular film,
The bottom portion is divided into two first and second bottom surface portions with the combined open end as an upper end,
Each bottom portion has left and right side ends orthogonal to the combined open end and a lower end parallel to the combined open end,
The bottom portion is a self-supporting bag that is coupled by a binding material that couples the bottom surface portion and the body portion at a side end of the bottom portion, and is coupled to the body portion at the lower end. Prepare a main body film constituting the body part and a bottom film constituting the bottom part,
Folding the bottom film to form first and second bottom surfaces with respect to the fold line;
A step of arranging the bottom film such that the first bottom surface portion overlaps the main body film, and the lower end of the main body film and the lower end of the bottom film substantially coincide with each other;
Arranging a binder so as to cover all side edges of the bottom film;
A step of bonding the bottom film and the main body film with the binder;
Forming the main body film with the surface where the bottom film is bonded inward to form a cylindrical shape, and connecting both ends of the main film to each other; and a lower end of the main film and the first and second bottom surfaces The manufacturing method of the self-supporting bag including the process of couple | bonding the lower end of a part.   The self-supporting according to claim 13, wherein the step of disposing the binding material so as to cover all the side edges of the bottom film is a step of disposing the binding material across only the main body film and the second bottom surface portion. Bag manufacturing method. The step of disposing the binding material so as to cover all side edges of the bottom film includes bending the binding material in the left-right direction and sandwiching the bottom film from the fold line side of the bottom film. A step of disposing the bottom surface portion outside and the second bottom surface portion outside,
The method for manufacturing a self-supporting bag according to claim 13, wherein the bottom film on which the binder is disposed is disposed such that the first bottom surface portion overlaps the main body film. The first bottom surface includes a step of disposing a binding material so as to cover all side edges of the bottom film so that the binding material is bent in the vertical direction and the bottom film is sandwiched from the side edge side of the bottom film. A step of arranging the outer side of the part and the outer side of the second bottom surface part,
The method for manufacturing a self-supporting bag according to claim 13, wherein the bottom film on which the binder is disposed is disposed such that the first bottom surface portion overlaps the main body film.

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