Container with zipper tape, manufacturing method of container with zipper tape, and zipper tape

Abstract

To provide a container with a zipper tape, a manufacturing method of the container with a zipper tape, and a zipper tape capable of sufficiently deaerating a bag even when an internal pressure of the bag increases due to heating.SOLUTION: The container with a zipper tape related to the present invention includes a container body in which a storage space is formed between a first surface and a second surface, and a zipper tape containing a first band-shaped base joined to the first surface, a second band-shaped base joined to the second surface, a first engagement portion and a second engagement portion. The second band-shaped base includes a first section in which a deaerating structure is formed and a second section in which the deaerating structure is not formed. In both the first section and the second section, the second surface is not joined on the storage space side with respect to the second engagement portion.SELECTED DRAWING: Figure 2A

Description

[Technical field]

[0001] The present invention relates to a container with a zipper tape, a method for manufacturing a container with a zipper tape, and a zipper tape. [Background technology]

[0002] Conventionally, bags in which food or the like is stored and which can be cooked have been widely used. Patent Document 1 describes such a bag having a steam-permeable structure (aeration-removing structure) that expands excessively during cooking to prevent leakage of the contents. The bag described in Patent Document 1 can release steam when heated by forming a non-sealed area between a part of the zipper tape and the bag body. Therefore, the male and female parts of the zipper tape are prevented from being released even when heated, preventing leakage of the contents. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-122931 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a non-sealed area is formed in the bag structure described in Patent Document 1, when the internal pressure of the bag increases due to heating, the zipper tape bends around the engaging portion between the male and female portions of the zipper tape, blocking the non-sealed area. As a result, the inside of the bag cannot communicate with the outside space, and the inside of the bag cannot be sufficiently deaerated, which may cause the engaging portion between the male and female portions of the zipper tape to be released.

[0005] Therefore, an object of the present invention is to provide a container with zipper tape, a manufacturing method for a container with zipper tape, and a zipper tape that can be sufficiently degassed even when the internal pressure of the bag increases due to heating. [Means for solving the problem]

[0006] [1] A container with zipper tape comprising: a container body including at least a first surface and a second surface opposing each other, with a storage space being formed between the first surface and the second surface; a first strip-shaped base joined to the first surface, a second strip-shaped base joined to the second surface, and a zipper tape including a first engagement portion and a second engagement portion protruding from the first strip-shaped base and the second strip-shaped base, respectively, and capable of engaging with each other, wherein the second strip-shaped base includes, in the longitudinal direction, a first section in which a deaeration structure is formed on the side opposite the storage space with respect to the second engagement portion, and a second section in which the deaeration structure is not formed, and both the first section and the second section are not joined to the second surface on the storage space side with respect to the second engagement portion. [2] The container with zipper tape described in [1], wherein the deaeration structure is a structure that connects the storage space side of the second strip base with the opposite side of the storage space, or a structure that connects the storage space side of the second strip base with the opposite side of the storage space when the pressure on the storage space side of the second strip base is higher than the pressure on the opposite side of the storage space. [3] The container with zipper tape described in [1] or [2], wherein when the first engagement portion and the second engagement portion are engaged with each other, the first strip-shaped base has an extension portion formed on the storage space side in the width direction that is longer than the end portion of the second strip-shaped base, and at least a portion of the extension portion is releasably joined to the second surface. [4] The container with zipper tape described in any one of [1] to [3], wherein the second belt-shaped base is joined to the second surface on the opposite side of the storage space with respect to the second engagement portion, and has a weakened portion formed in the first section on the opposite side of the second engagement portion with respect to the storage space. [5] The container with zipper tape described in [4], wherein the weakened portion is a cut portion or a thin-walled portion. [6] The container with a zipper tape according to any one of [1] to [5], wherein the first engaging portion is a male engaging portion and the second engaging portion is a female engaging portion. [7] The container with zipper tape according to any one of [1] to [6], further comprising a third engagement portion and a fourth engagement portion protruding from the first strip-shaped base and the second strip-shaped base, respectively, on the storage space side of the first engagement portion and the second engagement portion and engageable with each other, wherein the third engagement portion and the fourth engagement portion are a pair of hook-shaped engagement portions. [8] The container with zipper tape described in [3], wherein the bonding strength between the first belt-shaped base and the first surface is greater than the bonding strength between the extension portion of the first belt-shaped base and the second surface. [9] The container with a zipper tape according to any one of [1] to [8], wherein the deaeration structure is a vapor permeable structure.

[10] The container with a zipper tape according to any one of [1] to [9], wherein the container body forms a bag body.

[11] A method for manufacturing a container with a zipper tape, comprising: a step of supplying a zipper tape including a first strip-shaped base and a second strip-shaped base, and a first engaging portion and a second engaging portion protruding from the first strip-shaped base and the second strip-shaped base, respectively, and engageable with each other; a step of joining the first strip-shaped base and the second strip-shaped base to a first surface and a second surface opposed to each other, respectively, of a film; and a step of forming a container body that defines a storage space between the first surface and the second surface opposed to each other. and in the step of joining the first strip base and the second strip base to the first surface and the second surface of the film, respectively, which are opposed to each other, the second strip base includes, in the longitudinal direction, a first section in which a deaeration structure is formed on the side opposite the storage space with respect to the second engagement portion, and a second section in which the deaeration structure is not formed, and both the first section and the second section are not joined to the second surface on the storage space side of the second engagement portion.

[12] The method for manufacturing a container with a zipper tape according to

[11] , wherein the step of joining the first strip-shaped base and the second strip-shaped base to the first surface and the second surface facing each other of the film, respectively, includes a step of releasably joining at least a part of an extension portion formed on the first strip-shaped base toward the storage space in the width direction and longer than the end portion of the second strip-shaped base to the second surface when the first engaging portion and the second engaging portion included in the first strip-shaped base are engaged with each other.

[13] The method for manufacturing a container with a zipper tape according to

[11] or

[12] , wherein the step of joining the first strip base and the second strip base to the first surface and the second surface opposing each other of the film, respectively, includes a step of forming a weakened portion in at least a portion of one end side of the second engaging portion in the second strip base.

[14] The method for manufacturing a container with a zipper tape according to

[11] or

[12] , wherein in the step of joining the first strip base and the second strip base to the first surface and the second surface facing each other of the film, respectively, the second strip base having a weakened portion in at least a portion of one end side of the second engagement portion is joined to the second surface.

[15] A zipper tape comprising a first strip base, a second strip base, and a first engagement portion and a second engagement portion protruding from the first strip base and the second strip base, respectively, and capable of engaging with each other, wherein the second strip base has a weakened portion in at least a portion of one end side of the second engagement portion.

[16] The zipper tape according to

[15] , wherein the weakened portion is a cut portion or a thin-walled portion. Effect of the Invention

[0007] According to the container with zipper tape, the manufacturing method for a container with zipper tape, and the zipper tape of the present invention, when the internal pressure of the bag increases due to heating, the zipper tape does not bend even in the section where the deaeration structure is formed. Therefore, the gap between the zipper tape and the film forming the container is not blocked, and the storage space and the outside space can communicate with each other, making it possible to deaeration sufficiently. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a front view showing a bag body according to an embodiment of the present invention. [Figure 2A] 2 is a cross-sectional view of the bag body shown in FIG. 1 taken along line IIA-IIA. [Figure 2B] 2 is a cross-sectional view of the bag body shown in FIG. 1 taken along line IIB-IIB. [Figure 3A] FIG. 13 is a diagram for explaining the behavior of the bag body during steam passage, showing the cross section along the line IIA-IIA. [Figure 3B] FIG. 11 is a diagram for explaining the behavior of the bag body during steam passage, showing the cross section along the line IIB-IIB. [Figure 4] 2B is a front view of a bag according to a modified example of the zipper tape shown in FIG. 2A. FIG. [Diagram 5] 5 is a diagram for explaining the behavior of the bag body according to the example of FIG. 4 during steam passage. FIG. [Figure 6] 2B is a cross-sectional view showing a main part of a bag body according to another modified example of the zipper tape shown in FIG. 2A. FIG. [Figure 7] 7 is a diagram for explaining the behavior of the bag body according to the example of FIG. 6 during steam passage. FIG. [Figure 8] 2B is a cross-sectional view showing a main part of a bag body according to still another modified example of the zipper tape shown in FIG. 2A. FIG. [Figure 9] 1 is a perspective view of a three-side bag making machine for manufacturing a bag with a zipper tape according to an embodiment of the present invention. [Figure 10] FIG. 13 is a diagram for explaining the behavior of the bag body according to the conventional example during steam passage. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted.

[0010] (Bag structure) Hereinafter, a bag body 1 according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a front view of a bag body 1 according to one embodiment of the present invention. As shown in Fig. 1, the bag body 1 is a container with a zipper tape including a bag body 10 forming the bag body 1, which is a container body having a film 11A as a first surface and a film 11B as a second surface, and a zipper tape 20.

[0011] Bag body 10 is formed by overlapping films 11A and 11B, with a pair of side seal portions 12 formed around the periphery. When no packaged item is stored inside, top seal portion 13 or bottom seal portion 14 is formed, and when a packaged item is stored inside, top seal portion 13 and bottom seal portion 14 are formed. Bag body 10 defines storage space 10C in which the packaged item is stored by side seal portion 12, top seal portion 13, and bottom seal portion 14.

[0012] The zipper tape 20 is joined to the films 11A and 11B. Of the side seal portion 12 of the bag body 10, both ends in the longitudinal direction of the zipper tape 20 are flattened to form point seal portions (not shown). Also, notches 15 are cut into the bag body 10 between positions where both ends in the longitudinal direction of the zipper tape 20 intersect with the periphery of the side seal portion 12 of the bag body 10 and a position where the top seal portion 13 intersects with the periphery of the side seal portion 12.

[0013] As the films 11A and 11B, for example, a single-layer or multi-layer film formed of a thermoplastic resin such as linear low density polyethylene (LLDPE) or polypropylene (PP) is used. As the multi-layer film, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), biaxially oriented nylon (ONy), cast polypropylene (CPP), or the like can be used as the surface substrate. These are not limited to resins derived from fossil fuels, and may be environmentally friendly bioplastics (polyolefin resins such as biopolyethylene and biopolypropylene derived from biomass), or may be a mixture of a resin derived from fossil fuels and a bioplastic. Note that the multi-layer film may be configured to have an inorganic layer, such as aluminum deposition or lamination of aluminum foil, for the purpose of so-called gas barrier or light shielding.

[0014] The bag 1 may be used as a microwave cooking container for heating contents such as food using a microwave oven. When the bag 1 is heated, the internal pressure of the storage space 10C increases due to steam S generated from the contents. At this time, the steam S is discharged to the external space from a deaeration structure formed so as to be able to communicate the storage space 10C with the external space while the male engaging portion 21B and the female engaging portion 22B are engaged with each other at the engaging portion 23 of the zipper tape 20.

[0015] The deaeration structure is a structure that communicates the storage space C side of the female side belt-like base 22A, which is the second belt-like base, with the opposite side of the storage space C, or a structure that communicates the storage space C side of the female side belt-like base 22A with the opposite side of the storage space C when the pressure on the storage space C side of the female side belt-like base 22A is higher than the pressure on the opposite side of the storage space C. In this specification, the "storage space side of the second belt-like base" refers to the side of the storage space C from the female side seal part 22D between the female member 22 and the film 11B, that is, the side where a space is formed between the female member 22 and the film 11B. In addition, the "opposite side of the second belt-like base from the storage space" refers to the opposite side of the storage space C from the female side seal part 22D, that is, the side where the space between the female member 22 and the film 11B is open or the female member 22 is not present. The deaeration structure is a vapor-permeable structure when the internal pressure of the storage space 10C increases due to vapor S generated from the contents when heated, for example. In the following description, the "deaeration structure" will be described as a "vapor-permeable structure".

[0016] The steam-permeable structure is formed in section D in the longitudinal direction of the female side belt-like base 22A of the bag body 10, which is the first section. Section D may be in one location as shown in the figure, or may be in multiple locations. In sections other than section D (second sections), the steam-permeable structure is not formed. Section D is preferably 3 mm or more. Furthermore, from the viewpoint of efficiency of cooking using a microwave oven or the like, section D is preferably less than half the width of the bag body 10.

[0017] (Zipper tape composition) The detailed configuration of the zipper tape 20 is shown in Fig. 2A and Fig. 2B. Fig. 2A is a cross-sectional view of the bag body 1 shown in Fig. 1 taken along line IIA-IIA, and Fig. 2B is a cross-sectional view of the bag body 1 shown in Fig. 1 taken along line IIB-IIB. The zipper tape 20 shown in Fig. 2A has a vapor-permeable structure. The zipper tape 20 shown in Fig. 2B does not have a vapor-permeable structure. As shown in the figure, the zipper tape 20 includes a male member 21 and a female member 22 which are engageable with and disengageable from each other at an engagement portion 23. The male member 21 and the female member 22 are joined to the opposing inner surfaces of the films 11A and 11B, respectively, by an appropriate method such as heat sealing or adhesive.

[0018] The male member 21 includes a male belt-like base 21A, which is a first belt-like base, and a male engagement portion 21B, which is a first engagement portion that protrudes from the male belt-like base 21A and can engage with a female engagement portion 22B. The male engagement portion 21B is formed along the longitudinal direction (x direction in the figure) of the male belt-like base 21A. The male engagement portion 21B includes a first male claw 21B1 that protrudes on the side opposite to the storage space 10C, and a second male claw 21B2 that protrudes on the side opposite to the first male claw 21B1.

[0019] The pair of male seal parts 21D are formed on both sides in the width direction (y direction in the figure) between the male belt-like base part 21A and the film 11A, excluding the part corresponding to the engagement part 23. The male seal part 21D may be provided with a seal layer. The male belt-like base part 21A is joined to the film 11A by the pair of male seal parts 21D.

[0020] The male belt-like base 21A includes an extension 21C formed longer than the end of the female belt-like base 22A on the storage space 10C side in the width direction (y direction in the figure) of the male belt-like base 21A when the male engagement portion 21B and the female engagement portion 22B are engaged with each other. At least a part of the extension 21C is peelably joined to the film 11B.

[0021] In the extension 21C, an easy peel layer 21E is formed in a belt shape along the longitudinal direction (x direction in the figure) of the male side belt-like base 21A in an area extended beyond one edge of the female side belt-like base 22A. The easy peel layer 21E is formed between the extension 21C and the film 11B to bond them together. The bonding strength between the male side belt-like base 21A and the film 11A by the male side seal part 21D is higher than the bonding strength between the extension 21C and the film 11B by the easy peel layer 21E. The bonding strength of the easy peel layer 21E is set to allow the extension 21C to be peeled off from the film 11B when the user releases the engagement of the engagement part 23 to open the package.

[0022] The easy-peel layer 21E is used as a watertight means. If the storage space 10C is in communication with the vapor-permeable structure during transportation or storage of the bag body 1, there is a risk that the contents may leak out of the bag body 10 through the vapor-permeable structure. Therefore, it is preferable that the easy-peel layer 21E be used as a watertight means to provide a gap between the vapor-permeable structure and the storage space 10C.

[0023] The female member 22 includes a female side band-like base 22A which is a second band-like base, and a female type engaging portion 22B which is a second engaging portion that protrudes from the female side band-like base 22A and can engage with the male type engaging portion 21B. The female type engaging portion 22B is formed along the longitudinal direction (x direction in the figure) of the female side band-like base 22A. The female type engaging portion 22B is formed so that a first female side claw 22B1 which can be engaged with the first male side claw 21B1 and a second female side claw 22B2 which can be engaged with the second male side claw 21B2 face each other.

[0024] As shown in Figures 2A and 2B, the female belt-like base 22A is not joined to the film 11B on the storage space 10C side with respect to the female engagement portion 22B in both section D where the vapor-permeable structure is formed and sections other than section D. Also, as shown in Figure 2A, in section D, the female belt-like base 22A is not joined to the film 11B on the opposite side of the storage space 10C with respect to the female engagement portion 22B. On the other hand, as shown in Figure 2B, in sections other than section D, the female belt-like base 22A and the film 11B are joined by the female seal portion 22D on the opposite side of the storage space 10C with respect to the engagement portion 23. The female seal portion 22D may be provided with a seal layer.

[0025] Thus, in section D, the female belt-like base 22A is not joined to the film 11B on the side of the female engagement portion 22B facing the storage space 10C and on the side opposite the storage space 10C. Therefore, a gap is created between the female belt-like base 22A and the film 11B due to an increase in the internal pressure of the storage space 10C caused by heating the bag body 1. This allows the storage space 10C to communicate with the outside space, and steam S is discharged.

[0026] The zipper tape 20 is formed using, for example, a polyolefin resin. As the polyolefin resin, for example, a polyethylene resin such as low-density polyethylene or linear low-density polyethylene, or a polypropylene resin is preferable. As the polypropylene resin, homopolypropylene (H-PP), block polypropylene (B-PP), random polypropylene (R-PP), propylene-ethylene-butene 1 random terpolymer, or the like can be used. The polyolefin resin is not limited to a resin derived from fossil fuels, but may be an environmentally friendly bioplastic (a polyolefin resin such as biopolyethylene or biopolypropylene derived from biomass), or may be a mixture of a resin derived from fossil fuels and a bioplastic. The material of the zipper tape 20 may be added with known additives, such as a stabilizer, an antioxidant, a lubricant, an antistatic agent, or a colorant, as necessary.

[0027] Male seal portion 21D and female seal portion 22D are formed from, for example, polypropylene. Easy peel layer 21E is formed from, for example, polyethylene or a mixed layer of polyethylene and polypropylene. Specifically, it is formed in a layer shape from linear low density polyethylene (LLDPE), a mixture of low density polyethylene (LDPE) and high density polyethylene (HDPE), a mixture of low density polyethylene (LDPE) and polypropylene, or the like.

[0028] The resin component of the male seal portion 21D can be the same as that of the male member 21. The resin component of the female seal portion 22D can be the same as that of the female member 22. If the resin component of the male seal portion 21D is different from that of the male member 21, it is preferable that the male seal portion 21D uses a resin having a lower melting point than the resin of the male member 21. If the resin component of the female seal layer portion of the female seal portion 22D is different from that of the female member 22, it is preferable that the female seal layer portion of the female seal portion 22D uses a resin having a lower melting point than the resin of the female member 22.

[0029] (Behavior during steam passage) Fig. 3A is a diagram illustrating the behavior of the bag body 1 when steam passes through it, which is a cross section taken along line IIA-IIA. Also, Fig. 3B is a diagram illustrating the behavior of the bag body 1 when steam passes through it, which is a cross section taken along line IIB-IIB.

[0030] In the bag 1, the internal pressure of the storage space 10C increases due to steam S generated from the contents when heated. At this time, in sections other than section D where the vapor-permeable structure is formed, the female belt-like base 22A and the film 11B are joined by the female seal portion 22D on the opposite side of the female engagement portion 22B from the storage space 10C, as shown in Fig. 3B. Therefore, no gap is generated between the female member 22 and the film 11B due to the internal pressure of the storage space 10C, and the storage space 10C does not communicate with the outside space, so that the steam S is not discharged.

[0031] In section D, as shown in Fig. 3A, the female belt-like base 22A is not joined to the film 11B, so that the internal pressure of the storage space 10C creates a gap between the female belt-like base 22A and the film 11B, which allows the storage space 10C to communicate with the outside space and allows steam S to be discharged.

[0032] When the internal pressure of the storage space 10C increases due to heating of the bag body 1, the female belt-like base 22A is not joined to the film 11B on the storage space 10C side relative to the engaging portion 23, so a force acts on the male member 21 in the direction of arrow P1 in the figure, and a force acts on the female member 22 in the direction of arrow P2 in the figure. Accordingly, a force acts on the male engaging portion 21B pulling it toward the storage space 10C (arrows P3 and P4 in the figure), and a force acts on the female engaging portion 22B pulling it in the opposite direction to the storage space 10C (arrows P5 and P6 in the figure).

[0033] Therefore, a force acts in the direction in which the second male claw 21B2 and the second female claw 22B2 interlock with each other (arrows P3 and P5 in the figure). In addition, the zipper tape 20 is generally designed so that the hook of the claw on the storage space side is large so that it is difficult to open from the storage space side, so that the engagement of the engagement part 23 on the storage space 10C side becomes strong. In view of the above, it is preferable that the vapor passage structure is formed on the female-side belt-like base portion 22A side as in the bag body 1 of this embodiment.

[0034] (Comparison with conventional examples) Here, the behavior of bag 9, which is a conventional container with zipper tape, during steam passage will be described with reference to Fig. 10. The illustrated zipper tape 90 has a steam passage structure formed on the male member 91 side. Zipper tape 90 includes male member 91 and female member 92 which are engageable and detachable with each other at engagement portion 93. Male member 91 and female member 92 are joined to the opposing inner surfaces of films 81A and 81B, respectively.

[0035] The bag 9 according to the conventional example is generally similar to the bag 1 according to the present embodiment, but in sections other than section D where the vapor-permeable structure is formed, the male member 91 is also joined to the film 81A on the side of the engagement portion 93 of the storage space 80C. Therefore, when the internal pressure of the storage space 10C increases due to heating of the bag 1, the male side belt-like base 91A is bent along the film 81A with the engagement portion 93 as a fulcrum even in the section where the vapor-permeable structure is formed. At this time, the bent male side belt-like base 91A closes the gap between the male member 91 and the film 81A, and the storage space 80C cannot communicate with the external space. Therefore, there is a risk that the steam S will not be sufficiently discharged.

[0036] In contrast, in the bag body 1 of this embodiment, the female side belt-like base 22A is not joined to the film 11B on the storage space 10C side of the female side engagement part 22B in both section D and sections other than section D. Therefore, when the internal pressure of the storage space 10C increases due to heating of the bag body 1, the female side belt-like base 22A does not bend as in the conventional example even in section D. Therefore, as shown in Fig. 3A, the female side belt-like base 22A does not close the gap between the female member 22 and the film 11B, allowing the storage space 10C to communicate with the external space, and steam S can be sufficiently discharged.

[0037] Modifications of the zipper tape 20 in the present embodiment will be described below. In the following description of the modifications, the same components as those in the embodiment will be denoted by the same reference numerals, and description thereof will be omitted or simplified. [Variation 1] FIG. 4 is a front view of the bag body 1 according to a modified example of this embodiment. As shown in the figure, in the section D where the vapor-permeable structure is formed, a cut portion 22E, which is a weakened portion, is formed between the engagement portion 23 of the female side belt-like base 22A and the female side seal portion 22D. In addition, in the section D, the female side belt-like base 22A is joined to the film 11B by the female side seal portion 22D on the opposite side of the storage space 10C with respect to the engagement portion 23. The cut portion 22E may be continuous in the longitudinal direction of the female side belt-like base 22A, or may be intermittent in the form of perforations. The configuration of the bag body 1 other than the above is the same as that of the bag body 1 according to the embodiment described above.

[0038] FIG. 5 is a diagram for explaining the behavior of the bag body 1 according to the example of FIG. 4 during steam passage. When the internal pressure of the storage space 10C increases due to heating of the bag body 1, as shown in the figure, in section D, the female belt-like base 22A is joined to the film 11B by the female seal portion 22D on the opposite side of the storage space 10C with respect to the engagement portion 23. Therefore, the storage space 10C is connected to the outside space by the cut portion 22E, and steam S is discharged.

[0039] According to this example, since the female belt-like base 22A and the film 11B are joined even in section D, the seal bar used for joining can be formed uniformly, and alignment during joining is not required.

[0040] [Variation 2] Another modified example of the zipper tape 20 according to the present embodiment will be described with reference to FIG. As shown in the figure, in section D where the vapor-permeable structure is formed, the female side belt-like base 22A is joined to the film 11B by the female side seal portion 22D on the opposite side of the storage space 10C with respect to the engagement portion 23. Also, the female side belt-like base 22A has a thin-walled portion 22F, which is a weakened portion, formed between the engagement portion 23 and the female side seal portion 22D. The configuration of the bag body 1 other than the above is the same as that of the bag body 1 according to the embodiment described above.

[0041] FIG. 7 is a diagram for explaining the behavior of the bag body 1 according to the example of FIG. 6 during steam passage. When the internal pressure of the storage space 10C increases due to heating of the bag body 1, the thin-walled portion 22F breaks. Therefore, as shown in the figure, in section D, the storage space 10C communicates with the outside space through an opening formed by breaking the thin-walled portion 22F, and steam S is discharged.

[0042] According to this example, since the female belt-like base 22A and the film 11B are joined even in the section D, the seal bar used for joining can be formed uniformly, and alignment during joining is not required. Also, since the storage space 10C does not communicate with the outside space before the thin-walled portion 22E breaks, the easy-peel layer 21E is not necessarily required.

[0043] [Variation 3] Still another modification of the zipper tape 20 according to the present embodiment will be described with reference to FIG. The zipper tape 20 shown in Fig. 8 has a male hook portion 24, which is a third engaging portion protruding from the male belt-like base portion 21A, on the storage space 10C side of the male engaging portion 21B. The zipper tape 20 also has a female hook portion 25, which is a fourth engaging portion protruding from the female belt-like base portion 22A, on the storage space 10C side of the female engaging portion 22B. The male hook portion 24 and the female hook portion 25 are a pair of hook-shaped engaging portions that can engage with each other. The male hook portion 24 includes a male claw 24A that protrudes toward the storage space 10C, and the female hook portion 25 includes a female claw 25A with which the male claw 24A can engage.

[0044] When the internal pressure of the storage space 10C increases due to heating of the bag body 1, as explained with reference to Fig. 3A, a shear force acts on the male member 21 toward the storage space 10C, and a shear force acts on the female member 22 on the opposite side of the storage space 10C. Therefore, a shear force acts on the male hook portion 24 toward the storage space 10C, and a shear force acts on the female hook portion 25 on the opposite side of the storage space 10C. As a result, the shear force acts to engage the male hook portion 24 and the female hook portion 25 with each other.

[0045] In addition, in FIG. 8, an example has been described in which the engaging portion 23 includes the male hook portion 24 and the female hook portion 25 in addition to the male engaging portion 21B and the female engaging portion 22B, but multiple pairs of the male engaging portion 21B and the female engaging portion 22B may be included.

[0046] According to this example, in the engaging portion 23, in addition to the male engaging portion 21B and the female engaging portion 22B, the male hook portion 24 and the female hook portion 25 are engaged at a plurality of points, so that the engagement strength is increased and high sealing performance is obtained by the engagement.

[0047] (Manufacturing method of bags with zipper tape) FIG. 9 is a perspective view of a three-side bag making machine 600 for manufacturing a bag with a zipper tape according to an embodiment of the present invention. As shown in the figure, in the three-side bag making machine 600, a film supplying section 601 unwinds the film 11 wound around a film roll 602, and cuts it in the width direction using a cutting blade (not shown) to form a pair of films 11A and 11B facing each other. The films 11A and 11B may be formed by folding the film 11 without cutting it. Meanwhile, a tape supplying section 603 unwinds the zipper tape 20 wound around a tape roll 604, and supplies it to a predetermined position between the films 11A and 11B using a guide member (not shown). A seal bar 605 bonds the male side belt-like base 21A and the female side belt-like base 22A of the zipper tape 20 to the films 11A and 11B of the film 11, respectively. At this time, an easy peel layer 21E may be formed on a part of the extension portion 21C and bonded to the film 11B. The joining may be performed by heat sealing, ultrasonic welding, or bonding using an adhesive.

[0048] As in the example of FIG. 2A, when the female side belt-like base 22A and the film 11B are not joined only in the section D where the vapor-permeable structure is formed, the portion of the seal bar 605 corresponding to the storage space 10C side of the female side engagement part 22B in the section D may be made of a heat insulating material or may not be heat-sealed. As in the examples of FIG. 4 and FIG. 5, when the female side belt-like base 22A is formed with a weakened portion, for example, a cut portion 22E, the female side belt-like base 22A may be formed with the cut portion 22E in advance, or a step of forming the weakened portion, for example, the cut portion 22E, may be provided before joining the female side belt-like base 22A to the film 11B by the seal bar 605. As in the examples of FIG. 6 and FIG. 7, when the female side belt-like base 22A is formed with a thin portion 22F, the zipper tape 20 with the thin portion 22F formed in advance on the female side belt-like base 22A can be joined.

[0049] When the easy peel layer 21E is formed on a part of the extension 21C, the top seal portion 13 is formed between the films 11A and 11B by the seal bar 606 in the film 11 after the zipper tape 20 is joined. When the easy peel layer 21E is not formed on a part of the extension 21C, the top seal portion 13 and the bottom seal portion 14 are formed between the films 11A and 11B by the seal bar 606 in the film 11 after the zipper tape 20 is joined. In addition, the side seal portion 12 is formed by the seal bar 607. The bag body 1 with the zipper tape is manufactured through a process of forming the bag body 10 from the film 11 using a cutting blade 608 that cuts the film 11 in the longitudinal direction along the bottom seal portion 14 and a cutting blade 609 that cuts the film 11 in the width direction along the side seal portion 12.

[0050] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art in the technical field to which the present invention pertains can come up with various modified or altered examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention. [Explanation of symbols]

[0051] 1...bag body, 10...bag main body, 10C...storage space, 11A, 1B...film, 20...zipper tape, 21...male member, 21A...male side belt-shaped base, 21B...male engagement portion, 21C...extension portion, 21D...male side seal portion, 21E...easy peel layer, 22...female member, 22A...female side belt-shaped base, 22B...female engagement portion, 22E...slit portion, 22F...thin portion, 23...engagement portion, 24...male side hook portion, 25...female side hook portion, S...steam

Claims

1. a container body including at least a first surface and a second surface facing each other, with a storage space formed between the first surface and the second surface; a zipper tape including a first band-shaped base joined to the first surface, a second band-shaped base joined to the second surface, and a first engaging portion and a second engaging portion protruding from the first band-shaped base and the second band-shaped base, respectively, and capable of engaging with each other; Equipped with the second belt-shaped base includes, in the longitudinal direction, a first section in which an air release structure is formed on the side opposite the storage space with respect to the second engagement portion, and a second section in which the air release structure is not formed, and both the first section and the second section are not joined to the second surface on the storage space side with respect to the second engagement portion; Container with zipper tape.

2. 2. The container with zipper tape according to claim 1, wherein the deaeration structure is a structure that connects the storage space side of the second strip-shaped base with the opposite side of the storage space, or a structure that connects the storage space side of the second strip-shaped base with the opposite side of the storage space when the pressure on the storage space side of the second strip-shaped base is higher than the pressure on the opposite side of the storage space.

3. The first belt-shaped base has an extension portion formed on the storage space side in the width direction that is longer than the end portion of the second belt-shaped base when the first engaging portion and the second engaging portion are engaged with each other, and at least a portion of the extension portion is releasably joined to the second surface. The container with zipper tape according to claim 1.

4. The bonding strength between the first band-shaped base and the first surface is higher than the bonding strength between the extension of the first band-shaped base and the second surface; The container with zipper tape according to claim 3.

5. the second belt-shaped base is joined to the second surface on a side opposite to the storage space with respect to the second engaging portion, and has a weakened portion formed on the side opposite to the storage space with respect to the second engaging portion in the first section. The container with zipper tape according to claim 1.

6. The weakened portion is a notch or a thin-walled portion. The container with zipper tape according to claim 5.

7. The first engaging portion is a male engaging portion, and the second engaging portion is a female engaging portion. The container with zipper tape according to claim 1.

8. a third engaging portion and a fourth engaging portion protruding from the first band-shaped base and the second band-shaped base, respectively, on the storage space side of the first engaging portion and the second engaging portion, the third engaging portion and the fourth engaging portion being engageable with each other; the third engaging portion and the fourth engaging portion are a pair of hook-shaped engaging portions; The container with zipper tape according to claim 1.

9. The degassing structure is a steam-permeable structure. The container with zipper tape according to claim 1.

10. The container body forms a bag. The container with zipper tape according to claim 1.

11. providing a zipper tape including a first strip-shaped base, a second strip-shaped base, and a first engaging portion and a second engaging portion protruding from the first strip-shaped base and the second strip-shaped base, respectively, and engageable with each other; bonding the first belt-shaped base and the second belt-shaped base to a first surface and a second surface of a film, respectively, which are opposed to each other; forming a container body that defines a storage space between the first surface and the second surface that face each other; A method for manufacturing a container with a zipper tape, comprising: In the step of joining the first belt-shaped base and the second belt-shaped base to the first surface and the second surface of the film, respectively, which are opposed to each other, the second belt-shaped base includes, in the longitudinal direction, a first section in which an air release structure is formed on the opposite side of the second engagement portion from the storage space, and a second section in which the air release structure is not formed, and both the first section and the second section are not joined to the second surface on the storage space side of the second engagement portion; A method for manufacturing a container with zipper tape.

12. The step of joining the first belt-shaped base and the second belt-shaped base to the first surface and the second surface of the film, which are opposed to each other, respectively, includes: and a step of releasably joining at least a portion of an extension portion formed on the storage space side in the width direction longer than the end portion of the second strip-shaped base to the second surface when the first engaging portion and the second engaging portion included in the first strip-shaped base are engaged with each other. The method for manufacturing a container with a zipper tape according to claim 11.

13. The step of joining the first belt-shaped base and the second belt-shaped base to the first surface and the second surface of the film, which are opposed to each other, respectively, includes: forming a weakened portion in at least a portion of one end side of the second engagement portion in the second band-shaped base; A method for producing a container with a zipper tape according to claim 11 or 12.

14. In the step of joining the first belt-shaped base and the second belt-shaped base to the first surface and the second surface of the film, respectively, which are opposed to each other, the second belt-shaped base having a weakened portion in at least a portion of one end side of the second engagement portion is joined to the second surface; A method for producing a container with a zipper tape according to claim 11 or 12.

15. The device includes a first band-shaped base, a second band-shaped base, and a first engaging portion and a second engaging portion that protrude from the first band-shaped base and the second band-shaped base, respectively, and are engageable with each other; The second belt-shaped base has a weakened portion in at least a part of one end side of the second engagement portion. Zipper tape.

16. The weakened portion is a notch or a thin-walled portion. The zipper tape of claim 15.

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