Chain belt, film with chain belt, container with chain belt, and method for manufacturing container with chain belt

Abstract

A chain belt is provided with a first member including, in a cross-sectional shape, a first engaging portion, a first flange portion extending from the first engaging portion toward a first side in a width direction of the chain belt, and a second flange portion extending from the first engaging portion toward a second side in the width direction, and a second member including, in a cross-sectional shape, a second engaging portion capable of engaging with the first engaging portion, and a third flange portion extending from the second engaging portion toward the first side, and including a fourth flange portion extending from the second engaging portion toward the second side and formed shorter than the second flange portion or not including a flange portion extending from the second engaging portion toward the second side, at least a portion of the second flange portion in the width direction having a thickness greater than a maximum thickness of the first flange portion.

Description

Technical Field

[0001] This invention relates to a zipper belt, a membrane with a zipper belt, a container with a zipper belt, and a method for manufacturing a container with a zipper belt. Background Technology

[0002] For example, as described in Patent Document 1, there is a known method for manufacturing a container with a zipper belt by winding a film pre-jointed with a zipper belt onto a core and joining the two ends of the film to form the container body. In this manufacturing method, a filling device for the contents can also be assembled to the core, and the contents can be filled simultaneously with the manufacturing of the container.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2018 / 207631 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] For example, in the manufacturing method described in Patent Document 1, a film with a zipper belt is conveyed along the width direction of the zipper belt and wound onto a core. However, there are cases where the flange portion extending from the engagement portion of the zipper belt rolls up, or the engagement portion opens as the flange portion rolls up.

[0008] Therefore, the object of the present invention is to provide a zipper belt that can effectively prevent the flange portion from rolling up during the manufacturing of a container, a membrane with a zipper belt, a container with a zipper belt, and a method for manufacturing a container with a zipper belt.

[0009] Methods for solving problems

[0010] [1] A chain strap comprising a first member and a second member, wherein the first member comprises, in cross-sectional shape, a first engaging portion, a first flange portion extending from the first engaging portion toward a first side in the width direction of the chain strap, and a second flange portion extending from the first engaging portion toward a second side in the width direction; the second member comprises, in cross-sectional shape, a second engaging portion capable of engaging with the first engaging portion and a third flange portion extending from the second engaging portion toward the first side, and includes a fourth flange portion extending from the second engaging portion toward the second side and formed to be shorter than the second flange portion, or does not include the flange portion extending from the second engaging portion toward the second side; at least a portion of the thickness of the second flange portion in the width direction is greater than the maximum thickness of the first flange portion.

[0011] [2] According to the chain belt of [1], a thick-walled portion is formed in the second flange portion, the thickness of the second flange portion at the thick-walled portion is greater than the thickness of the thick-walled portion or rib formed in the first flange portion, and when the second member includes the fourth flange portion, the thick-walled portion is formed in the area of ​​the second flange portion that is not opposite to the fourth flange portion.

[0012] [3] According to the chain belt of [1] or [2], wherein a rib is formed on the second flange portion, the thickness of the second flange portion at the rib is greater than the thickness of the rib or thick-walled portion formed on the first flange portion, and when the second member includes the fourth flange portion, the rib is formed in the region of the second flange portion that is not opposite to the fourth flange portion.

[0013] [4] The zipper belt according to any one of [1] to [3], wherein the difference between the thickness of at least a portion of the second flange portion in the width direction and the maximum total thickness of the first flange portion and the third flange portion is less than 100 μm.

[0014] [5] The zipper belt according to any one of [1] to [4], wherein the second member includes the fourth flange portion, the length of the fourth flange portion being 4 mm or less.

[0015] [6] The zipper tape according to any one of [1] to [5], wherein the third flange portion is formed to be longer than the first flange portion in cross-sectional shape, and the zipper tape further comprises a tear strip disposed between the first engaging portion and the end of the third flange portion on the first side.

[0016] [7] According to the chain belt of [6], the tear strip is provided in a portion of the area of ​​the third flange that is not opposite to the first flange.

[0017] [8] The zipper belt according to [6], wherein the tear strip is provided at the end of the first side of the first flange portion.

[0018] [9] According to the chain belt of [6], the end of the first side of the first flange portion constitutes the tear strip, and a peeling layer is provided between the tear strip and the third flange portion.

[0019]

[10] A membrane with a zipper tape, wherein the zipper tape of any one of [6] to [9] is joined to the membrane, wherein at least a portion of the first flange portion and the second flange portion and at least a portion of the third flange portion not opposite to the first flange portion are joined to the membrane.

[0020]

[11] The membrane with a zipper belt according to

[10] , wherein a tongue is formed in a portion of the length direction of the zipper belt by a cut that transverses the tear strip, the membrane with the zipper belt is provided with a protective film covering at least a portion of the length direction of the zipper belt including the tongue from the side opposite to the membrane, the protective film being joined to the membrane, the third flange portion and at least a portion of the second flange portion.

[0021]

[12] The membrane with a clamping strip according to

[11] , wherein the cut includes a plurality of portions that clamp the non-forming portion in the middle, such that the non-forming portion breaks and the plurality of portions are continuous with each other, thereby forming the tongue.

[0022]

[13] A container with a zipper belt, formed from a membrane with a zipper belt as described in any one of

[10] to

[12] , wherein the membrane is folded back at both ends of the zipper belt along its length to form a container body.

[0023]

[14] A method for manufacturing a container with a zipper belt, wherein the container with a zipper belt is formed from a film with a zipper belt as described in any one of

[10] to

[12] , wherein the method for manufacturing a container with a zipper belt includes the steps of conveying the film with the zipper belt along the width direction of the zipper belt and winding it onto a core, and joining the two ends of the film wound on the core to form a container body.

[0024] According to the above structure, the second flange portion is formed to a sufficient length so that the zipper tape is stably bonded to the membrane on both sides of the engagement portion. In contrast, the fourth flange portion, which is not bonded to the membrane, is formed to be shorter than the second flange portion or is not formed at all, thereby preventing roll-up. Furthermore, by increasing the thickness of the second flange portion in the first region of the second flange portion, the reduction of the overall thickness of the zipper tape can be suppressed, and the zipper tape can be stably bonded to the membrane, etc. Attached Figure Description

[0025] Figure 1 This is a top view of a container with a zipper belt according to the first embodiment of the present invention.

[0026] Figure 2 It is along Figure 1 A sectional view along line II-II.

[0027] Figure 3 It is shown Figure 2 A diagram of a variation.

[0028] Figure 4 It is shown Figure 2 The diagram shows the relationship between the dimensions in the example.

[0029] Figure 5 This is a cross-sectional view of a container with a zipper belt according to a second embodiment of the present invention.

[0030] Figure 6 This is a cross-sectional view of a container with a zipper belt according to the third embodiment of the present invention.

[0031] Figure 7 This is a cross-sectional view showing variations that can be applied to various embodiments.

[0032] Figure 8 This is a diagram illustrating a membrane with a chain strap according to an embodiment of the present invention.

[0033] Figure 9 This is a diagram showing variations of the tongue that can be applied in various embodiments.

[0034] Figure 10 This is a diagram illustrating the manufacturing process of a container with a zipper belt according to an embodiment of the present invention. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, in this specification and the accompanying drawings, constituent elements having substantially the same functional structure are omitted from repeated description by using the same reference numerals.

[0036] Figure 1 This is a top view of a container with a zipper belt according to a first embodiment of the present invention. In the container 100 with the zipper belt, a zipper belt 120 is joined to the container body formed of a membrane 110.

[0037] The membrane 110 is composed of, for example, a single layer or multiple layers of thermoplastic resin film. Specifically, the thermoplastic resin can be low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or polypropylene (PP). PP can also be homopolymer polypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). When the membrane 110 is composed of multiple layers, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), or biaxially oriented nylon (ONy) can be used as the surface substrate. Furthermore, the membrane constituting the membrane 110 can also include layers of metallic materials such as aluminum, or layers of inorganic materials. Additionally, a resin membrane containing any amount of bioplastics such as biopolymer polyethylene can also be used. By folding the membrane 110 back at both ends along the length of the chain strap 120 and joining the two ends at the back sealing portion 112, a top sealing portion 113 and a bottom sealing portion 114 are formed, thus forming a bag-shaped container body including a first surface 111A and a second surface 111B that are opposed to each other.

[0038] The zipper tape 120 is an elongated member formed with a cross-sectional shape as described later, and is joined to the first surface 111A of the membrane 110. The zipper tape 120 includes: first and second members, each including a pair of engaging portions 121 and flange portions as described later; and a tear strip 123. Examples of resins forming the portions of the zipper tape 120 include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or polypropylene (PP). Examples of PP include homopolymer polypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). These can also be environmentally friendly bioplastics, or mixtures of resins derived from fossil fuels and biomass plastics such as biopolymer polyethylene can be used. In addition, examples of environmentally friendly biodegradable resins used as the resins forming the various parts of the sandwich band 120 include polylactic acid (PLA), polybutylene succinate (PBS), poly(butylene adipate / butylene terephthalate) (PBAT), polycaprolactone (PCL), poly(butylene adipate / butylene succinate) (PCLBS), poly(butylene succinate / adipic acid) (PBSA), poly(butylene succinate / carbonate) (PEC), poly(ethylene terephthalate / ethylene succinate) (PETS), poly(butylene adipate / butylene terephthalate) (PTMAT), poly(ethylene succinate) (PES), polyvinyl alcohol (PVA-H), polyglycolic acid (PGA), and poly(hydroxybutyrate / hydroxyhexanoate) (PHBH). These biodegradable resins can also be derived from biomass. The materials of each part of the chain belt 120 may contain one or more of the resins exemplified above, and may be further supplemented as needed with known additives, such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants.

[0039] In the container 100 with the zipper belt, a tongue is formed near a portion of the length of the zipper belt 120, specifically near one end of the zipper belt 120 along its length, by a cut 131 that transverses the zipper belt 123. Additionally, a protective film 141 is provided that covers at least a portion of the length of the zipper belt 120, including the tongue, from the side of the membrane 110 opposite to the first surface 111A. The protective film 141 prevents a decrease in the container's airtightness caused by the cut 131. In the illustrated example, a cut 132 is also formed near the other end of the zipper belt 120 along its length to form the endpoint of the tear on the first surface 111A caused by the zipper belt 123, and a protective film 142 is also provided covering the area including the cut 132. The protective films 141 and 142 are, for example, formed of the same material as the membrane 110. It should be noted that the cut 132 can be replaced by a thin-walled portion, for example, in which case the protective film 142 can also be provided. Furthermore, regarding the portion forming the tongue, if the container's airtightness can be ensured by other means, a protective film is not necessary.

[0040] Figure 2 It is along Figure 1 A cross-sectional view along line II-II, showing the cross-sectional shape of the chain strap. Figure 3 yes Figure 2 A magnified view of a portion of the image. As shown in the figure. Figure 1 The shown zipper belt 120 includes a first component 120A and a second component 120B. The first component 120A, in its cross-sectional shape, includes a first engaging portion 121A, a first flange portion 122A extending from the first engaging portion 121A towards a first side in the width direction of the zipper belt 120, and a second flange portion 122B extending from the first engaging portion 121A towards a second side in the width direction. Specifically, the first side in the width direction of the zipper belt 120 is the side where the tear strip 123 forms an opening in the container body when the container 100 with the zipper belt is formed, and the second side is the side opposite to the opening. Therefore, for simplicity, the first side and the second side will be referred to as the opening side and the non-opening side, respectively, in the following description. However, the first side and the second side can also be distinguished in the state before the zipper belt 120 is installed on the membrane 110. The above description does not limit the invention to the state where the zipper belt 120 forms a container 100 with an opening in the container body.

[0041] The second member 120B includes, in its cross-sectional shape, a second engaging portion 121B, a third flange portion 122C extending from the second engaging portion 121B toward the opening side, and a fourth flange portion 122D extending from the second engaging portion 121B toward the non-opening side. Alternatively, as... Figure 3As shown, the second member 120B may also not include the flange extending from the second engaging portion 121B toward the non-opening side. The second engaging portion 121B can engage with the first engaging portion 121A, constituting... Figure 1 The diagram shows a pair of engaging portions 121. It should be noted that the first engaging portion 121A is shown as convex and the second engaging portion 121B as concave, but the convex and concave shapes can be reversed. Furthermore, various engaging portions such as hook-shaped and nodular shapes can be used in addition to convex and concave shapes; it is not limited to a single pair and may include multiple pairs of engaging portions. Regarding the relationship with the flange portion of the first member 120A extending in the same direction in the cross-sectional shape, the third flange portion 122C is formed to be longer than the first flange portion 122A, and the fourth flange portion 122D is formed to be shorter than the second flange portion 122B, or is not formed at all. As shown in the figure, when the zipper belt 120 is installed onto the membrane 110, the first member 120A is engaged with the first surface 111A of the membrane 110 at at least a portion of the first flange portion 122A and the second flange portion 122B, and the second member 120B is engaged with the first surface 111A at at least a portion of the area of ​​the third flange portion 122C that is not opposite to the first flange portion 122A.

[0042] A tear strip 123 is disposed between the first engaging portion 121A and the open-side end of the third flange portion 122C. More specifically, in this embodiment, the tear strip 123 is disposed between the open-side end of the first flange portion 122A extending from the first engaging portion 121A and the thick-walled portion 127 formed at the open-side end of the third flange portion 122C opposite to it, i.e., a portion of the area of ​​the third flange portion 122C that is not opposite to the first flange portion 122A. The tear strip 123 may also be joined to the first surface 111A of the membrane 110 together with other parts of the chain strap 120. By pinching the tear strip 123 from the tongue formed by the cut 131 and pulling, the first surface 111A can be torn to form an opening in the container. In the illustrated example, the cut 131 is also formed on the side of the second member 120B. Therefore, when the tear strip 123 is pulled from the tongue, a part of the second member 120B is also pulled. However, for example, the second member 120B breaks at the sealing part where the protective film 141, which does not have the cut 131, is joined to the second member 120B. After that, the tear strip 123 tears the first surface 111A while peeling off from the second member 120B, specifically the third flange 122C.

[0043] To facilitate peeling, the resin forming the second component 120B and the resin forming the tear strip 123 can be a combination of resins with low compatibility. Examples of resin combinations with low compatibility, without limitation, include low-density polyethylene (LDPE) / random polypropylene (RPP), linear low-density polyethylene (LLDPE) / RPP (partially, including m-LL), LDPE / homogeneous polypropylene (HPP), LLDPE / HPP (partially, including m-LL), LDPE / polystyrene (PS), LLDPE / PS (including m-LL), RPP / PS, HPP / PS, LDPE / polyethylene terephthalate (PET), LLDPE / PET, RPP / PET, HPP / PET, PS / PET, LDPE / nylon (Ny), LLDPE / Ny, RPP / Ny, HPP / Ny, or PS / Ny. When the first component 120A and the second component 120B are formed using biodegradable resins, the tear strip 123 is also preferably formed from a biodegradable resin.

[0044] In this embodiment, the second flange portion 122B is formed to a sufficient length so that the zipper tape 120 is stably bonded to the membrane 110 on both sides of the engagement portion 121. In contrast, the fourth flange portion 122D, which is not bonded to the membrane 110, is formed to be shorter than the second flange portion 122B or is not formed at all. This prevents the fourth flange portion 122D from rolling up during the container manufacturing process when the membrane 110 with the zipper tape 120 is wound onto the core, as described later. When the fourth flange portion 122D is formed, the length of the fourth flange portion 122D in the cross-sectional shape, i.e. Figure 4 The width dimension w of the shown zipper tape 120 is preferably 4 mm or less from the end of the irregular portion of the second engaging portion 121B, more preferably 3 mm or less, and even more preferably 2 mm or less. On the other hand, the dimension w of the fourth flange portion 122D is preferably 0 mm or more, more preferably 0.5 mm or more, and more preferably 1 mm or more. Therefore, during the manufacture of the film with the zipper tape, the zipper tape 120 can be stably fed out using a guide, and a stable engagement can be achieved without causing defects such as tilting of the zipper tape.

[0045] Furthermore, in this embodiment, at least a portion of the thickness of the second flange portion 122B is greater than the maximum thickness of the first flange portion 122A extending towards the opposite side of the engaging portion. More specifically, as... Figure 4As shown, the thickness t1 of the thick-walled portion 124 formed in the second flange portion 122B is greater than the thickness t3 of the thick-walled portion 126 formed in the first flange portion 122A or the thickness t4 of the rib 125C. When the fourth flange portion 122D is formed, the thick-walled portion 124 is formed in the region of the second flange portion 122B that is not opposite to the fourth flange portion 122D. Alternatively, the thickness t2 of the rib 125A formed in the second flange portion 122B is greater than the thickness t4 of the rib 125C formed in the first flange portion 122A or the thickness t3 of the thick-walled portion 126. The rib 125A is also formed in the region of the second flange portion 122B that is not opposite to the fourth flange portion 122D when the fourth flange portion 122D is formed. By forming such thick-walled portions 124 and ribs 125A, the reduction in the overall thickness of the chain strap 120 caused by the relatively short or absent fourth flange portion 122D is suppressed.

[0046] By suppressing the reduction of the overall thickness of the zipper tape 120 in the region where the fourth flange portion 122D is not formed, the difference in the overall thickness of the zipper tape 120 on both sides of the engaging portion 121 becomes smaller. For example, when the zipper tape 120 is joined to the membrane 110, the first flange portion 122A and the second flange portion 122B can be stably pressed and joined to the membrane 110 using a sealing rod.

[0047] As an example, the difference between the maximum thickness t1 or t2 of the second flange portion 122B and the maximum total thickness of the first flange portion 122A and the third flange portion 122C is preferably 100 μm or less. More specifically, the difference between the thickness t1 of the portion of the second flange portion 122B forming the thick-walled portion 124, or the thickness t2 of the portion forming the rib 125A, and the total thickness t3+t5 or t4+t5 of the first flange portion 122A and the third flange portion 122C is preferably 100 μm or less. This difference is more preferably 50 μm or less, further preferably 30 μm or less, and even more preferably 10 μm or less. The smaller the difference, the better, so the lower limit is not particularly limited, but when the thickness of at least a portion of the second flange portion 122B in the width direction is equal to the maximum total thickness of the first flange portion 122A and the third flange portion 122C, the above-mentioned difference becomes 0 μm. It should be noted that, in Figure 4 An example of forming a fourth flange portion 122D is shown, but the same applies to examples where a fourth flange portion is not formed.

[0048] It should be noted that, in order to reduce the overall thickness difference of the chain strap 120, or to guide the tearing of the membrane 110 caused by the tear strip 123, in addition to the thick-walled portion 124, ribs 125A and 125B, ribs 125C and thick-walled portion 126 may also be formed in the first flange portion 122A, or thick-walled portion 127 may be formed in the third flange portion 122C.

[0049] Furthermore, in the case where a protective film 141 is present as shown in the example, by suppressing the reduction in the overall thickness of the zipper tape 120 in the area where the fourth flange portion 122D is not formed, the protective film 141 can be stably bonded to the film 110 and the zipper tape 120. More specifically, the peripheral portion of the protective film 141 is bonded to the film 110 on both sides of the zipper tape 120, the third flange portion 122C of the second member 120B, and the second flange portion 122B of the first member 120A. For example, if a thick-walled portion 124 is formed in the second flange portion 122B, the protective film 141 can be stably bonded to this thick-walled portion. By stably bonding the protective film 141 to the second flange portion 122B at its peripheral portion, the reduction in the airtightness of the container caused by the formation of the slit 131 can be more reliably prevented.

[0050] As explained above, in the first embodiment of the present invention, by forming the fourth flange portion 122D, which is not engaged with the film 110 in the zipper tape 120, to be shorter than or not formed at all, it is possible to prevent the fourth flange portion 122D from rolling up during the container manufacturing process when the film 110 with the zipper tape 120 engaged is wound onto the core. Moreover, by making at least a portion of the thickness of the second flange portion 122B greater than the thickness of the first flange portion 122A, for example, the stability of the engagement when the zipper tape 120 is engaged with the film 110, when the protective film 141 is engaged with the film 110, and when the zipper tape 120 is engaged can be improved.

[0051] Figure 5 This is a cross-sectional view of a container with a zipper strap according to a second embodiment of the present invention. The arrangement of the tear strip 123 in this embodiment differs from that in the first embodiment described above, but the other structural details are the same; therefore, repeated detailed descriptions are omitted. In this embodiment, the tear strip 123 is provided at the end of the first flange portion 122A on the opening side. Alternatively, as shown in the example, a thin-walled portion 122E may be formed at the end of the first flange portion 122A on the opening side, and the tear strip 123 may be stacked on the side of the thin-walled portion 122E opposite to the second member 120B. In this case, the tear strip 123, pulled from the tongue, peels off from the third flange portion 122C, tearing a portion of the first flange portion 122A, including the thin-walled portion 122E, along with the first surface 111A to form an opening in the container.

[0052] Figure 6This is a cross-sectional view of a container with a zipper belt according to a third embodiment of the present invention. The arrangement of the tear strip 223 in this embodiment differs from that in the first embodiment described above, but the structure is otherwise the same; therefore, repeated detailed descriptions are omitted. In this embodiment, the tear strip 223 is formed at the open end of the first flange portion 122A. Therefore, the first member 120A including the first flange portion 122A and the tear strip 223 are formed, for example, from the same material. Furthermore, a release layer 224 is provided between the tear strip 223 and the third flange portion 122C. By providing the release layer 224, even if the first member 120A and the second member 120B of the zipper belt 120 are formed from the same material as the tear strip 223, the tear strip 223 can be easily peeled off from the third flange portion 122C when it is pulled. The first member 120A, the second member 120B, the tear strip 223, and the release layer 224 may also be formed, for example, from a combination of resins with low compatibility as described above.

[0053] Figure 7 This is a cross-sectional view showing a variation applicable to the various embodiments described above. In the embodiments described above, examples of forming thick-walled portions 124, 126, 127, and ribs 125A, 125B, and 125C in the chain strap 120 were described, but these structures are not necessary. For example, as shown, ribs and thick-walled portions may not be formed in each flange portion, and the second flange portion 122B may be formed thicker overall in the first region R1 where it does not oppose the fourth flange portion 122D. The thicker portion 128 is exemplified as a stepped portion, but for example, it may not be a step but rather a portion where the second flange portion 122B gradually thickens towards the non-opening side. In addition, ribs and thick-walled portions may not be formed in the same way in all flange portions; for example, ribs and thick-walled portions may be formed only in a portion of the flange portions, or both. Furthermore, regarding the portion forming the tongue, if the airtightness of the container can be ensured by other means, a protective film may not be necessary, as shown.

[0054] Figure 8This is a diagram illustrating a film with a zipper tape according to an embodiment of the present invention. The zipper tape 120 described above can also be joined to, for example, a rolled film 110 formed before the container body, and provided as a film 300 with a zipper tape. In this case, the width direction of the film 110 is aligned with the length direction of the zipper tape 120. As described above as a structure of a container with a zipper tape, at least a portion of each of the first flange portion 122A and the second flange portion 122B, and at least a portion of the area of ​​the third flange portion 122C that does not oppose the first flange portion, are joined to the film 110. Furthermore, when protective films 141 and 142 are provided, the protective films 141 and 142 are arranged in a manner that covers the cutouts 131 and 132 of the tongue from the side opposite to the film 110, within at least a portion of the length direction of the zipper tape 120. As will be explained below, the membrane 110 is formed into the container body on both ends of the chain belt 120 along its length, so that the width L1 of the membrane 110 is more than twice the length L2 of the chain belt.

[0055] Figure 9 This diagram illustrates a variation of the tongue that can be applied in various embodiments. In the illustrated example, the cut 131 forming the tongue includes multiple portions 131A, 131B, 131C, and 131D that sandwich the non-forming portion 133 in between. By breaking the non-forming portion 133, the multiple portions 131A, 131B, 131C, and 131D are made continuous with each other, thereby forming the tongue. Thus, for example, when used as... Figure 8 When the film with the chain strap shown is wound, it can prevent the tongue formed by the cut 131 from floating up. For this purpose, the non-forming portion 133 between portions 131A and 131B at one end of the tongue and the non-forming portion 133 between portions 131C and 131D at the other end of the tongue are effective when viewed in the width direction of the chain strap. In this case, the non-forming portion 133 between portions 131B and 131C may not need to be formed. Not limited to these examples, the cut 131 forming the tongue may be divided into more or fewer portions than in the illustrated example. In addition, the shape of the tongue is not limited to the illustrated example and can be any other shape.

[0056] Figure 10This diagram illustrates the manufacturing process of a container with a zipper strap according to an embodiment of the present invention. In the illustrated example, the manufacturing apparatus 500 includes a supply mechanism 501 for supplying the aforementioned film 300 with a zipper strap, a core 502, a conveyor belt 503, and a back seal forming portion 504. The film 300 with the zipper strap is conveyed from top to bottom by the conveyor belt 503 while being wound around the core 502. The core 502 has a generally circular cross-section at its upper part, thereby enabling the film 300 with the zipper strap to be smoothly wound into a cylindrical shape. The cylindrical film 110 is folded back on both sides in the width direction, that is, on both ends in the length direction of the zipper strap 120, thereby forming the first surface 111A and the second surface 111B of the container body. The area where the zipper strap 120 is joined is called the first surface 111A. The back seal forming portion 504 forms a back seal portion 112 by joining the two ends of the wound film 110 in the width direction, for example, by heat sealing. The area with the sealing part 112 on the back becomes the second surface 111B.

[0057] In embodiments of the present invention, it is possible to prevent the flange portion of the zipper tape 120 not engaged with the film 110, specifically the fourth flange portion 122D, from rolling up or the locking portion 121 from opening when the film 300 with the zipper tape is wound onto the core 502 during the manufacturing process described above.

[0058] The manufacturing apparatus 500 also includes sealing rods 505 and 506, a cutting tool 507, and a pad 508. The sealing rods 505 and 506 include portions that clamp the cutting tool 507 and are positioned opposite each other on their upper and lower sides. These opposing portions are used to form a top sealing portion 113 and a bottom sealing portion 114 on the membrane 110, for example, by heat sealing. The cutting tool 507 approaches and separates from the pad 508, cutting the membrane 110 in the width direction near the top sealing portion 113 and the bottom sealing portion 114.

[0059] Here, the aforementioned core 502 is hollow, with a filling device 509 inserted from above inside. The filling device 509, together with the sealing rods 505 and 506, clamps the membrane 110 and simultaneously ejects the contents. This allows the contents to be filled into a storage space higher than the bottom sealing portion 114. When the sealing rods 505 and 506 separate, the contents, along with the membrane 110, are conveyed downwards past the sealing rods 505 and 506. Then, the sealing rods 505 and 506 clamp the membrane 110 to form a top sealing portion 113, thereby sealing the storage space.

[0060] Through the manufacturing process described above, a container 100 with a zipper strap can be manufactured. It should be noted that the above process is an example and various modifications are possible. For instance, the manufacturing process of a membrane 300 with a zipper strap, including supplying a membrane 110 without the zipper strap 120, joining the zipper strap 120, forming the slits 131 and 132, and joining the protective films 141 and 142, can be performed as a series of processes with the manufacturing process of a container with a zipper strap as described above.

[0061] Explanation of reference numerals in the attached figures

[0062] 100: Container with a zipper belt; 110: Membrane; 111A: First side; 111B: Second side; 112: Back seal; 113: Top seal; 114: Bottom seal; 120: zipper belt; 120A: First component; 120B: Second component; 121: Engaging part; 121A: First engaging part; 121B: Second engaging part; 122A: First flange; 122B: Second flange; 122C: Third flange; 122D: Fourth flange; 122E: Thin-walled part; 123 223: Tear strip; 124, 126, 127: Thick-walled portion; 125A, 125B, 125C: Ribs; 224: Peel layer; 128: Thicker portion; 131, 132: Cut; 141, 142: Protective film; 300: Film with interlocking belt; 500: Manufacturing device; 501: Supply mechanism; 502: Core; 503: Conveyor belt; 504: Back seal forming portion; 505, 506: Sealing rod; 507: Cutting tool; 508: Pad; 509: Filling device.

Claims

1. A chain strap comprising a first component and a second component, wherein, The first component includes, in its cross-sectional shape, a first engaging portion, a first flange extending from the first engaging portion toward a first side in the width direction of the chain strap, and a second flange extending from the first engaging portion toward a second side in the width direction. The second component includes, in its cross-sectional shape, a second engaging portion capable of engaging with the first engaging portion and a third flange portion extending from the second engaging portion toward the first side, and includes a fourth flange portion extending from the second engaging portion toward the second side and formed to be shorter than the second flange portion, or may not include the flange portion extending from the second engaging portion toward the second side. The thickness of at least a portion of the second flange in the width direction is greater than the maximum thickness of the first flange.

2. The chain strap according to claim 1, wherein, A thick-walled portion is formed in the second flange portion, and the thickness of the second flange portion at the thick-walled portion is greater than the thickness of the thick-walled portion or rib formed in the first flange portion. When the second component includes the fourth flange portion, the thick-walled portion is formed in the region of the second flange portion that is not opposite to the fourth flange portion.

3. The chain strap according to claim 1 or 2, wherein, A rib is formed in the second flange portion, and the thickness of the second flange portion at the rib is greater than the thickness of the rib or thick-walled portion formed in the first flange portion. When the second member includes the fourth flange, the rib is formed in the region of the second flange that is not opposite to the fourth flange.

4. The chain strap according to any one of claims 1 to 3, wherein, The difference between the thickness of at least a portion of the second flange portion in the width direction and the maximum combined thickness of the first flange portion and the third flange portion is less than 100 μm.

5. The chain strap according to any one of claims 1 to 4, wherein, The second component includes the fourth flange portion, the length of which is less than 4 mm.

6. The chain strap according to any one of claims 1 to 5, wherein, The third flange is longer than the first flange in cross-sectional shape. The chain strap also includes a tear strip disposed between the first engaging portion and the end of the third flange portion on the first side.

7. The chain conveyor belt according to claim 6, wherein, The tear strip is provided in a portion of the third flange portion that is not opposite to the first flange portion.

8. The chain conveyor belt according to claim 6, wherein, The tear strip is provided at the end of the first side of the first flange portion.

9. The chain belt according to claim 6, wherein, The first side end of the first flange portion constitutes the tear strip, and a peeling layer is provided between the tear strip and the third flange portion.

10. A membrane with a zipper tape, wherein the zipper tape of any one of claims 6 to 9 is joined to the membrane, wherein, At least a portion of the first flange portion and the second flange portion, and at least a portion of the area of ​​the third flange portion that is not opposite to the first flange portion, are joined to the membrane.

11. The membrane with a chain strap according to claim 10, wherein, A tongue is formed on a portion of the length of the chain strap by making a cut that bisects the tear strip. The membrane with the zipper tape is configured with a protective film that covers at least a portion of the length of the zipper tape, including the tongue, from the side opposite to the membrane. The protective film is bonded to at least a portion of the film, the third flange, and the second flange.

12. The membrane with a chain strap according to claim 11, wherein, The incision includes multiple sections that sandwich the non-forming portion in the middle. The non-forming portion is broken to make the plurality of portions continuous with each other, thereby forming the tongue.

13. A container with a zippered strap, formed from the membrane with a zippered strap according to any one of claims 10 to 12, wherein, The membrane is folded back at both ends of the chain strap along its length to form the container body.

14. A method for manufacturing a container with a zippered belt, comprising forming a container with a zippered belt from a film with a zippered belt as described in any one of claims 10 to 12, wherein, The method for manufacturing the container with the zipper belt includes the steps of conveying the film with the zipper belt along the width direction of the zipper belt and winding it onto a core, and joining the two ends of the film wound onto the core to form a container body.

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