Container with zipper tape and manufacturing method of the same

Abstract

To provide a container with a zipper tape that further reliably makes a shape of an end part different after opening, regardless of a configuration of a laminated film of a container body and the direction in which a tearing force is applied.SOLUTION: In a zipper tape whose cross-sectional shape includes a first part and a second part facing each other, in the first part, among first, second and third regions in a width direction, the first and third regions are thick-wall parts, both end parts in the width direction of the second region located between the first and third regions are thin-wall parts, and a part between the thin-wall parts is an intermediate part, and in the second part, a thin wall-part facing the intermediate part is formed in the second region, and a remaining part is a thick-wall part. A notch is formed at a longitudinal end part of the zipper tape that overlaps a side seal part. In a part that overlaps with the end part of the notch, an easy-to-open part consisting of a scar is provided in a resin film constituting at least an intermediate layer of a laminated film of a container body to which the zipper tape is bonded.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a container with a zipper tape and a method for producing the same. [Background technology]

[0002] As a packaging material for packaging various items such as food, medicine, medical supplies, miscellaneous goods, etc., a bag with zipper tape is used, in which a pair of strip-shaped zipper tapes formed of male and female members that interlock with each other are arranged at the opening of the bag, and the interlocking state can be opened and closed freely. Such a bag with zipper tape is sealed by sealing the upper part of the zipper tape, and when opening it, it can be opened by tearing the film of the bag body, starting from notches formed on both sides of the bag.

[0003] As an example of such a technique, Patent Document 1 (e.g., Figure 10) describes a technique for stably inducing tearing of the film of the bag body by using a thin section and a thick section provided at the base of the zipper tape. By providing thin sections at different positions on the zipper tape joined to both sides of the bag body, the ends of the zipper tape after the film is torn are staggered, making it easy to widen the opening by hooking a finger or the like on the end of the zipper tape when removing the contents from the bag body.

[0004] Furthermore, Patent Document 2 describes a technology in which, in a zipper tape having a cross-sectional shape including first and second portions opposed to each other, in the first portion, among the first, second and third regions in the width direction, the first and third regions are thick portions, both ends in the width direction of the second region located between the first and third regions are thin portions, and the portion between these thin portions is an intermediate portion, and in the second portion, a thin portion is formed in the second region facing the intermediate portion, and the remaining portion is a thick portion. This makes it possible to more reliably make the shape of the end portion after opening uneven regardless of the direction in which the tearing force acts. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-104334 A [Patent Document 2] International Publication No. 2021 / 060235 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the case of the technology described in Patent Document 1, depending on the direction of the force that tears the bag body, the end of the zipper tape after opening may or may not be uneven. The technology described in Patent Document 2 solves this problem, but depending on the configuration of the laminated film used as the container body, the shape of the end after opening may not be uneven.

[0007] Therefore, the present invention aims to provide a container with zipper tape that can more reliably make the shape of the ends staggered after opening, regardless of the configuration of the laminated film of the container body or the direction in which the tearing force acts, and a manufacturing method thereof. [Means for solving the problem]

[0008] [1] A container with zipper tape comprising a container body having at least a first surface and a second surface opposing each other, and a zipper tape, the zipper tape including, in a cross-sectional shape, a first portion and a second portion configured to be at least partially opposing each other, at least a part of the first portion is joined to the first surface, and at least a part of the second portion is joined to the second surface, each of the first portion and the second portion includes, in a cross-sectional shape, a base portion and an engaging portion protruding from the base and capable of engaging with each other, the first portion has a first region, a second region and a third region in a width direction of the zipper tape, a thick portion is formed in the first region, and a thick portion continuous with the base is formed in the third region, a first thin portion and a second thin portion are formed at both ends in the width direction of the second region located between the first region and the third region, and at least a first intermediate portion and a second intermediate portion, the first region and the third region of the second portion each having a thick portion extending beyond an end portion of the second region in the width direction, and the second region has at least one third thin portion facing the intermediate portion, side seal portions where the first surface and the second surface are joined are formed at both ends of the container body, and a notch is formed at an end portion of the zipper tape in the longitudinal direction overlapping with the side seal portion, the notch formed in the first portion includes a tapered portion or a bulging portion directed toward the first thin portion and the second thin portion, and the notch formed in the second portion includes a tapered portion or a bulging portion directed toward the third thin portion, and in the laminate film constituting the first surface and the second surface, an easy-to-open portion consisting of a scar is provided at least in a portion of a resin film constituting an intermediate layer of the laminate film that overlaps with an end portion of the notch. [2] The container with zipper tape described in [1], wherein the easy-to-open portion is provided linearly across the entire width of the container body along the longitudinal direction of the zipper tape. [3] The container with zipper tape according to [1] or [2], wherein the laminated film includes a nylon layer as the intermediate layer. [4] The container with a zipper tape according to [3], wherein the laminate film has a laminate structure in which a PET layer, an aluminum layer, a nylon layer and a linear low-density polyethylene layer are laminated in this order. [5] A container with a zipper tape described in any one of [1] to [4], wherein the middle portion is formed with a thickness corresponding to the thick portion. [6] The container with a zipper tape described in any one of [1] to [5], wherein the first thin portion, the second thin portion and the third thin portion are formed with a thickness of 10 μm or more and 200 μm or less, and the thick portions of the first region and the third region are formed with a thickness of 200 μm or more and 700 μm or less. [7] A container with a zipper tape described in any one of [1] to [6], wherein the first region, the second region and the third region cover the entire area of ​​the zipper tape other than the base portion and the engagement portion. [8] The container with zipper tape described in any one of [1] to [7], wherein the first portion and the second portion are connected to each other at a widthwise end of the first region opposite the second region, or at a widthwise end of the base opposite the third region. [9] A container with a zipper tape described in any one of [1] to [8], wherein the thick portion and the intermediate portion of the first part are joined to the first surface, and the thick portion of the second part is joined to the second surface.

[10] A container with a zipper tape described in any one of [1] to [9], wherein the container body is bag-shaped.

[11] A container with a zipper tape according to any one of [1] to

[10] , wherein the cutout formed in the first portion includes a first bulge portion and a second bulge portion directed toward the first thin-walled portion and the second thin-walled portion, respectively, and the cutout formed in the second portion includes a tapered portion directed toward the third thin-walled portion.

[12] The container with zipper tape according to

[11] , wherein the first bulge protrudes more toward the longitudinal center of the zipper tape than the second bulge.

[13] The container with a zipper tape described in any one of [1] to

[10] , wherein the cutout formed in the first portion includes a first tapered portion and a second tapered portion directed toward the first thin-walled portion and the second thin-walled portion, respectively, and the cutout formed in the second portion includes a tapered portion directed toward the third thin-walled portion.

[14] A container with a zipper tape according to any one of [1] to

[13] , wherein in the longitudinal direction of the zipper tape, a first position where the tapered portion or the bulge portion is connected to the first thin portion in the first portion is different from a second position where the tapered portion or the bulge portion is connected to the third thin portion in the second portion.

[15] The container with zipper tape according to

[14] , wherein the second position is closer to a longitudinal end of the zipper tape than the first position.

[16] The container with zipper tape described in

[15] , wherein the distance between the first position and the second position is 2 mm or more and 50 mm or less.

[17] A method for manufacturing a container with a zipper tape described in any one of [1] to

[16] , comprising the steps of: forming the notch in the zipper tape; joining the zipper tape with the notch formed therein to the container body; and forming the side seal portion crossing the notch in the container body to which the zipper tape is joined.

[0009] According to the above configuration, after the tape or zipper tape is attached to the bag body, whether a force is applied from the first surface side or the second surface side, the thin-walled part formed on the side where the force is applied is located in the storage space with respect to the thin-walled part formed on the opposite side, so that the shape of the end after opening can be made uneven more reliably regardless of the direction in which the tearing force is applied. Also, by providing an easy-to-open part consisting of a scar at least in the part overlapping the end of the notch, the above effect can be achieved regardless of the configuration of the laminated film of the container body. [Brief description of the drawings]

[0010] [Figure 1] 1 is a plan view of a tape-attached bag according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3A] 2 is a diagram showing a case where a force is applied from the first surface side in the example of FIG. 1. FIG. [Figure 3B] 2 is a diagram showing a case where a force is applied from the second surface side in the example of FIG. 1. FIG. [Figure 4] 5A to 5C are diagrams for explaining an example of a method for manufacturing a tape in one embodiment of the present invention. [Diagram 5] 5A to 5C are diagrams showing examples of the shape of a notch in the example shown in FIG. 4. [Figure 6] FIG. 2 is a diagram showing an example of a laminate film constituting a bag body in one embodiment of the present invention. [Figure 7] 13A and 13B are diagrams showing examples of easy-to-open portions formed of scars in one embodiment of the present invention. [Figure 8] 13A and 13B are diagrams for explaining a position where an easy-to-open portion is formed. [Figure 9] FIG. 11 is a cross-sectional view showing a modified example of an embodiment of the present invention. [Figure 10] FIG. 11 is a diagram showing another example of a cutout in the embodiment of the present invention. [Figure 11] FIG. 11 is a diagram showing another example of a cutout in the embodiment of the present invention. [Figure 12] FIG. 11 is a diagram showing another example of a cutout in the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] 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.

[0012] Fig. 1 is a plan view of a bag with a zipper tape according to one embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. As shown in the figure, the bag with zipper tape 100 includes a bag body 110 formed of a film and having a first surface 111A and a second surface 111B facing each other, and zipper tapes 120 joined to the first surface 111A and the second surface 111B of the bag body 110, respectively, to define one side of a storage space SP formed between the first surface 111A and the second surface 111B.

[0013] The bag body 110 is formed of a laminated film as described below. The laminated film includes a layer formed of a thermoplastic resin such as low-density polyethylene, linear low-density polyethylene, or polypropylene. The polypropylene may be homopolypropylene, random polypropylene, or block polypropylene. For example, biaxially oriented polypropylene, biaxially oriented polyethylene terephthalate, or biaxially oriented nylon is used as the surface substrate of the laminated film. These resin materials are not limited to resins derived from fossil fuels, and may be environmentally friendly bioplastics, or a mixture of fossil fuel-derived resins and bioplastics. As the bioplastic, for example, biopolyethylene is preferable. The laminated film may also include a layer of a metal material such as aluminum, or an inorganic material. For example, by making the bag body 110 into a mono-material of a resin composition mainly composed of polyethylene, like the zipper tape 120 described below, an environmentally friendly configuration with excellent recyclability can be achieved.

[0014] In this embodiment, the bag body 110 is formed by overlapping two films and joining them to each other at the top seal portion 112, the bottom seal portion 113, and the side seal portion 114. In another embodiment, the bag body 110 may be formed by folding back one film at a portion corresponding to the side seal portion 114. In addition, the bag body 110 may have a portion where the film is folded inward at a portion corresponding to the bottom seal portion 113 or the side seal portion 114, that is, a so-called gusset. In this case, the gusset may be formed of the same film as the first surface 111A or the second surface 111B, or may be formed of a film different from these. In addition, the bag 100 with the zipper tape may be a standing pouch that can be placed upright by forming a gusset at the bottom.

[0015] 2, the zipper tape 120 is an elongated member including a first portion 120A and a second portion 120B facing each other in a cross-sectional shape. The first portion 120A includes a first thick portion 121A, a second thick portion 122A, thin portions 123A and 123B, an intermediate portion 124, a base portion 125A and an engagement portion 126A that constitute the zipper portion in a cross-sectional shape. The second portion 120B includes a first thick portion 121B, a second thick portion 122B, a thin portion 123C, a base portion 125B and an engagement portion 126B that constitute the zipper portion in a cross-sectional shape.

[0016] The first portion 120A is joined to the first surface 111A of the bag body 110 at the first thick portion 121A, the second thick portion 122A, and the base portion 125A. The second portion 120B is also joined to the second surface 111B of the bag body 110 at the first thick portion 121B, the second thick portion 122B, and the base portion 125B. In the illustrated example, the first portion 120A is also joined to the first surface 111A at the intermediate portion 124, but the intermediate portion 124 does not have to be joined to the first surface 111A. From the viewpoint of facilitating alignment during manufacturing, it is more advantageous to join the intermediate portion 124 to the first surface 111A. In addition, the first thick portions 121A, 121B and the second thick portions 122A, 122B do not necessarily have to be joined to the first surface 111A or the second surface 111B over the entire surface, and for example, the portions adjacent to the thin portions 123A, 123B, 123C do not necessarily have to be joined to the first surface 111A or the second surface 111B. In this case, a portion having a thickness intermediate between the thick portions 121, 122 and the thin portion 123 may be provided between the thick portions 121, 122 and the thin portion 123. In addition, the base portions 125A, 125B do not necessarily have to be joined to the first surface 111A or the second surface 111B over the entire surface.

[0017] The bases 125A and 125B are joined to the first surface 111A and the second surface 111B of the bag body 110, respectively, and face each other, and the engagement parts 126A and 126B protrude from the bases 125A and 125B, respectively, and can be engaged with each other. The second thick parts 122A and 122B are continuous with the bases 125A and 125B, respectively. In the illustrated example, the second thick parts 122A and 122B are formed thicker than the bases 125A and 125B, but in other examples, the second thick parts 122A and 122B and the bases 125A and 125B may have the same thickness. The shape of the engagement parts 126A and 126B is not limited to the illustrated example, and can be any shape of known zipper engagement parts that combine claw shapes, hook shapes, knob shapes, and the like. In the illustrated example, the engaging portion 126A is male and the engaging portion 126B is female, but they may be reversed. Also, in the illustrated example, one pair of engaging portions is provided, but multiple pairs of engaging portions may be provided.

[0018] In the zipper tape 120, the first thick portions 121A, 121B and the second thick portions 122A, 122B do not necessarily have to be the same thickness, but the thin portions 123A, 123B, 123C (hereinafter sometimes collectively referred to as the thin portions 123) are portions formed thinner than both the first thick portions 121A, 121B and the second thick portions 122A, 122B (hereinafter sometimes collectively referred to as the thick portions 121, 122). The middle portion 124 is formed thicker than the thin portions 123A, 123B. The thickness relationship between the intermediate portion 124 and the thick portions 121A and 122A is not necessarily limited, but when the intermediate portion 124 is joined to the first surface 111A together with the thick portions 121A and 122A as in the illustrated example, it is preferable that the intermediate portion 124 is formed with a thickness corresponding to the thick portions 121A and 122A. The corresponding thickness does not necessarily have to be strictly the same thickness, but means a thickness close to a degree that makes it easy to join the thick portions 121A and 122A and the intermediate portion 124 to the same surface (first surface 111A) as in the illustrated example. Specifically, the thickness of the intermediate portion 124 is preferably within ±20% of the thickness of the thick portions 121A and 122A, more preferably within ±10%, and even more preferably the same thickness. Note that when the thicknesses of the thick portions 121A and 122A are different, it is preferable that the thickness of the intermediate portion 124 is within the above range with respect to the average value of these thicknesses. By setting the thickness of intermediate portion 124 within the above range, intermediate portion 124 can be more reliably joined to first surface 111A.

[0019] The zipper tape 120 as described above is formed, for example, by extrusion molding of a polyolefin resin. More specifically, the zipper tape 120 may be formed of low-density polyethylene, linear low-density polyethylene, or polypropylene. The polypropylene may be homopolypropylene, random polypropylene, or block polypropylene. These are not limited to resins derived from fossil fuels, and may be environmentally friendly bioplastics, or a mixture of a resin derived from fossil fuels and a bioplastic. As the bioplastic, for example, biopolyethylene is preferable. The material of the zipper tape 120 may be added with known additives, such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants, as necessary.

[0020] The zipper tape 120 may be mono-materialized with a resin composition mainly composed of polyethylene. In this case, the entire zipper tape 120, i.e., the first thick portions 121A and 121B, the second thick portions 122A and 122B, the thin portions 123A, 123B and 123C, and the intermediate portion 124, are all formed with a resin composition mainly composed of polyethylene. Here, the main component is a component that occupies a predetermined ratio or more of the resin composition, and is usually a component whose content is 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, particularly preferably 98% by mass or more, and most preferably 100%. However, even when the content of the main component is 100%, the mixture of additives and impurities is permitted. The main component can be confirmed, for example, by the IR method. By mono-materializing the zipper tape 120 with a resin composition mainly composed of polyethylene, an environmentally friendly configuration with excellent recyclability is possible. Furthermore, by using bio-polyethylene as the polyethylene, an environmentally friendly structure with excellent recyclability can be achieved.

[0021] Here, as shown in FIG. 2, a first region R 1 , the second region R 2 and the third region R 3These regions are common to the first portion 120A and the second portion 120B of the zipper tape 120 when the first portion 120A and the second portion 120B face each other. 1 , the second region R 2 and the third region R 3 is the third region R 3 is adjacent to the zipper region including bases 125A, 125B, and a second region R 2 is the first region R 1 and the third region R 3 The first region R 1 , the second region R 2 and the third region R 3 It may cover the entire area of ​​the zipper tape 120 in the width direction except for the base portions 125A, 125B and the engagement portions 126A, 126B as in the example shown in FIG. 2, or it may not cover those areas as in the modified example described later.

[0022] In the first portion 120A, a first region R 1 and the third region R 3 The first thick portion 121A and the second thick portion 122A are formed in the second region R 2 In the second portion 120B, the thin wall portion 123A and the thin wall portion 123B are formed at both ends in the width direction, and the intermediate portion 124 is formed between the thin wall portion 123A and the thin wall portion 123B. 1 and the third region R 3 The first thick portion 121B and the second thick portion 122B are formed in the second region R 2 That is, in the second portion 120B, the first thick portion 121B and the second thick portion 122B each extend beyond the boundary of the first region R 1 or the third region R 3 to the second region R 2 The second region R 2 The thin portion 123C formed in the second portion 120B faces the intermediate portion 124 formed in the first portion 120A.

[0023] As described above, in the present embodiment, in the first portion 120A, the thin portion 123A and the thin portion 123B are in the second region R 2 In contrast, in the second portion 120B, a first thick portion 121B and a second thick portion 122B are formed in the second region R 2 Since the thin-walled portions 123A and 123B extend beyond the ends in the width direction of the first portion 120A, the thin-walled portions 123A and 123B do not face the thin-walled portions of the second portion 120B. The thin-walled portion 123C formed in the second portion 120B does not face between the thin-walled portions 123A and 123B of the first portion 120A, but faces the intermediate portion 124 formed between the thin-walled portions. As a result, when the first portion 120A and the second portion 120B face each other, the thin-walled portions 123A to 123C are arranged alternately in the width direction of the zipper tape 120, specifically, from the top seal portion 112 side, in the order of the thin-walled portion 123A, the thin-walled portion 123C, and the thin-walled portion 123B, without overlapping with each other.

[0024] With the above-mentioned configuration, in the bag with zipper tape 100 according to this embodiment, for example, when a user tears and opens the bag body 110 starting from the notch 115 formed in the side seal portion 114 at the longitudinal end of the zipper tape 120, the ends of the zipper tape 120 and the bag body 110 after opening can be made uneven. Specifically, for example, when a force F for tearing the bag body 110 acts from the first surface 111A side as shown in Fig. 3A, the thin portion 123A breaks at the first portion 120A of the zipper tape 120, the thin portion 123C breaks at the second portion 120B, and the tearing of the bag body 110 is guided along the thin portions 123A and 123C, so that the ends of the zipper tape 120 and the bag body 110 after opening become uneven. As shown in FIG. 3B, even when force F acting to tear bag body 110 acts from the second surface 111B side, thin-walled portion 123C breaks at second portion 120B of zipper tape 120, and thin-walled portion 123B breaks at first portion 120A, and the tearing of bag body 110 is guided along thin-walled portions 123B and 123C, resulting in uneven ends of zipper tape 120 and bag body 110 after opening.

[0025] According to the findings of the inventors, when a thin-walled portion formed on the opposite side to the side on which the force F that tears the bag body 110 acts (the first surface 111A side in the example of Figure 3A, and the second surface 111B side in the example of Figure 3B) is located on the storage space SP side, the end of the zipper tape 120 after breaking is likely to become uneven. Therefore, for example, in the above example, if the thin portion 123B is not formed in the first portion 120A of the zipper tape 120, when force F is applied from the first surface 111A side as in the example shown in Figure 3A, the thin portion 123A and the thin portion 123C will break, resulting in an uneven end of the zipper tape 120 after opening. However, when force F is applied from the second surface 111B side as in the example shown in Figure 3B, since the thin portion 123A is located closer to the top seal portion 112 than the thin portion 123C, the first portion 120A will break near the middle portion 124 (note that if the thin portion 123B is not formed, it is not called the middle portion), rather than near the thin portion 123A, and the ends of the zipper tape 120 and the bag body 110 after opening may not be uneven.

[0026] In contrast, in this embodiment, as described above, whether a force is applied from the first surface 111A side or the second surface 111B side, the thin-walled portion formed on the side where the force is applied is located on the storage space SP side, and therefore, regardless of the direction in which the force is applied, the ends of the zipper tape 120 and the bag body 110 after opening can be made uneven with more certainty. This makes it easier to widen the opening by hooking a finger or the like on the end of the tape when removing the contents from the bag body, as described above. At this time, in order to make it even easier to widen the opening, a rib facing the inside of the bag body may be formed on the end of each part other than the thin-walled part (thick part or middle part).

[0027] In this embodiment, the thin-walled parts 123A, 123B, and 123C may be thinner than the adjacent parts, i.e., the thick-walled parts 121 and 122 and the intermediate part 124, but may be formed with a thickness of, for example, 200 μm or less so that they are easily broken by the above force. The thickness of the thin-walled parts 123A, 123B, and 123C is preferably 150 μm or less, more preferably 120 μm or less, even more preferably 100 μm or less, and particularly preferably 80 μm or less. By setting the thickness within such a range, the tensile strength can be reduced, and the thin-walled parts can be broken more easily. The lower limit of the thickness of the thin-walled parts 123A, 123B, and 123C is not particularly limited, but is usually 10 μm.

[0028] On the other hand, the dimension of the thin parts 123A, 123B, 123C in the width direction of the zipper tape 120 is usually 10 μm or more, preferably 30 μm or more. The upper limit is usually 3 mm, preferably 1 mm or less. By setting it in this range, for example, in the example described later, the openability is improved by interaction with the R (radius of curvature) formed in the cutout 131.

[0029] For example, when the zipper tape 120 is formed by extrusion molding, a transitional portion of thickness is formed between the thick portions 121, 122 or the intermediate portion 124 and the thin portions 123A, 123B, 123C. In this case, the thin portions 123A, 123B, 123C are specified as portions formed thinner than the thinner of the thick portions 121, 122 or the intermediate portion 124 on both sides. Therefore, when the thicknesses of the thick portions 121, 122 and the intermediate portion 124 on both sides are different, there may be a portion (transitional portion of thickness) between the thick portion and the thin portions 123A, 123B, 123C that is neither a thick portion, an intermediate portion, nor a thin portion. In addition, when the thicknesses of the thin portions 123A, 123B, 123C are specifically specified as described above, the thin portions 123A, 123B, 123C are specified as portions that satisfy the thickness specification. In this case, there may be a portion (thickness transition portion) between the thick portions 121, 122 and the intermediate portion 124 that is neither a thick portion, an intermediate portion, nor a thin portion.

[0030] On the other hand, the thick parts 121, 122 may be thicker than the adjacent thin parts 123A, 123B, 123C, but the thickness is preferably 200 μm or more, more preferably 250 μm or more, and even more preferably 300 μm or more. By making the thickness of the thick parts 121, 122 200 μm or more, the tensile strength is increased, and the thick parts 121, 122 can be prevented from breaking due to the force at the time of opening. In addition, the upper limit of the thickness of the thick parts 121, 122 is not particularly limited, but is usually 700 μm. By making the thickness of the thick parts 121, 122 700 μm or less, the occurrence of pinholes due to melt flattening can be prevented.

[0031] As described above, the bag body 110 is formed by overlapping two films or folding back one film, but when overlapping two films, the direction in which the crystals are oriented between the film forming the first surface 111A and the film forming the second surface 111B can be adjusted to induce the tearing of the bag body 110 starting from the notch 115 to be in different directions on the first surface 111A side and the second surface 111B side, making it easier for the end of the bag body 110 to be uneven after opening. Similarly, when folding back one film, the end of the bag body 110 can be easily made uneven after opening by adjusting the fold between the first surface 111A and the second surface 111B to be non-parallel and non-perpendicular to the direction in which the crystals of the film are oriented.

[0032] FIG. 4 is a diagram for explaining an example of a method for manufacturing a tape in one embodiment of the present invention. As shown in FIG. 1, in the bag 100 with zipper tape according to this embodiment, a notch 131 overlapping the side seal portion 114 is formed at the longitudinal end of the zipper tape 120. This notch 131 is formed when the bag 100 with zipper tape is continuously manufactured using a bag making machine, for example, as shown in FIG. 4. Specifically, the notches 131 (openings at this point) are formed in the long zipper tape 120 at the same interval as the width of the bag body 110 after manufacturing, that is, the interval of the side seal portion 114. Thereafter, the zipper tape 120 is joined to the bag body 110, and further the side seal portion 114, the top seal portion 112, and the bottom seal portion 113 that cross the notch 131 are formed. The bag body 110 to which the zipper tape 120 is joined is cut at the center of the side seal portion 114 to obtain the bag 100 with zipper tape as shown in FIG. 1.

[0033] For example, when a user tries to tear the bag body 110 starting from a notch 115 formed in the side seal portion 114 at the longitudinal end of the zipper tape 120, the thus formed notch 131 guides the tearing of the bag body 110 starting from the notch 115 to proceed along the thin portion formed in the zipper tape 120. Specifically, for example, as shown in FIG. 5(a), a notch 131A having a shape including a bifurcated tapered portion 132A facing the thin portions 123A and 123B may be formed on the side of the first portion 120A of the zipper tape 120. Also, as shown in FIG. 5(b), a notch 131B having a shape including a single tapered portion 132B facing the thin portion 123C may be formed on the side of the second portion 120B of the zipper tape 120. In this way, by forming the notch 131 in a shape that matches the position of the thin-walled portion formed in each of the first portion 120A and the second portion 120B of the zipper tape 120, the effect of making the ends of the zipper tape 120 and the bag body 110 uneven after opening can be more easily and reliably obtained. In addition, it is preferable to give R (radius of curvature) to the tip of the tapered portion. By giving R, even if there is some deviation in the position of the tip of the acute angle during processing, it is possible to guide the tear to the thin-walled portion, and the number of manufacturing defects can be reduced. R is, for example, 0.1 mm to 1.0 mm, and preferably 0.2 mm to 0.7 mm.

[0034] 6 is a diagram showing an example of a laminated film constituting a bag body in one embodiment of the present invention. In the laminated film constituting the bag body 110 in this embodiment, the outermost layer, the base material layer 110A, the intermediate layers, the metal layer 110B and the functional layer 110C, and the innermost layer, the sealant layer 110D, which comes into contact with the contents, are laminated in this order. The above layers do not necessarily have to be directly adjacent to each other, and for example, an adhesive layer may be laminated between at least any of the layers.

[0035] The base layer 110A is preferably formed from a film having excellent printability, heat resistance so that it does not melt when heat-sealed for bag making, and puncture strength, tensile strength, impact resistance, etc. Examples of materials for the film constituting the base layer 110A include polyethylene terephthalate, polypropylene, polyamide (nylon), polyethylene, and ethylene-vinyl alcohol copolymer, and biaxially or uniaxially oriented films thereof are preferable. In addition, in order to impart a barrier property against oxygen or water vapor to these films, a deposition film in which a metal such as aluminum or magnesium or an oxide such as silicon oxide is deposited, or a coated film coated with a barrier coating agent such as polyvinylidene chloride may be used.

[0036] The metal layer 110B is made of a metal foil such as aluminum, which has a barrier property against oxygen and water vapor, and is formed by, for example, evaporating a metal or oxide onto the film constituting the base layer 110A, as described above.

[0037] The functional layer 110C is a layer having functionality such as impact resistance, pinhole resistance, and barrier properties against oxygen and water vapor. As a film having impact resistance and pinhole resistance, a resin film containing polyamide is preferable. As a film having barrier properties against oxygen and water vapor, a deposition film in which a metal such as aluminum or a metal oxide such as silica or alumina is deposited on the same film as the film forming the base layer 110A, or an ethylene vinyl alcohol resin film is preferable. In addition, a film similar to the film forming the base layer 110A can be used as the functional layer 110C. The functional layer 110C may be used as a single layer or as a multilayer.

[0038] Sealant layer 110D is a layer that is bonded to an opposing layer by application of heat and pressure, specifically, by melting with the opposite surface of bag body 110 or zipper tape 120. Examples of materials for sealant layer 110D include polyethylene, such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene, and polypropylene, and unstretched films made of these resins or layers of these resins extruded are preferred.

[0039] The above-mentioned base layer 110A, metal layer 110B, functional layer 110C, and sealant layer 110D are laminated together by an existing method such as dry lamination or extrusion lamination to form a laminated film. An example of the laminated film configuration is a laminated film including a nylon layer as an intermediate layer, more specifically, a laminated film in which the base layer 110A is a PET layer, the metal layer 110B is an aluminum layer, the functional layer 110C is a nylon layer, and the sealant layer 110D is a linear low-density polyethylene layer, but is not limited to these examples.

[0040] FIG. 7 is a diagram showing an example of an easy-to-open portion made of a scar provided in one embodiment of the present invention. In the laminated film constituting the bag body 110 as described above, an easy-to-open portion made of a scar is provided in a portion overlapping an end of the notch 131 (notches 131A and 131B shown in FIG. 5) of the resin film constituting the intermediate layer of the laminated film. The easy-to-open portion may be provided continuously not only at the end of the notch 131 but also over the entire length of the zipper tape 120 in the longitudinal direction (total width of the bag body 110), or may be provided intermittently at a predetermined interval in the longitudinal direction of the zipper tape 120 (width direction of the bag body 110). When the easy-to-open portions are provided intermittently, the interval between the easy-to-open portions may be appropriately adjusted according to the width dimension of the bag 100 with the zipper tape, the position of the notch 131, the position of the thin-walled portion, and the like. Also, it is desirable that the width of the easy-open part (the dimension in the depth direction of the bag 100 with zipper tape) is at least wider than the width of the notch 131 (the dimension in the depth direction of the bag 100 with zipper tape). Specifically, the width of the easy-open part is preferably 5 mm to 50 mm, and more preferably 10 mm to 25 mm. The easy-open part may be provided in the base material layer and intermediate layer constituting the laminated film, or may be provided only in the intermediate layer constituting the laminated film. When the easy-open part is provided in the base material layer and intermediate layer constituting the laminated film, it is preferable that the easy-open part of each layer is aligned in the depth direction of the bag 100 with zipper tape.

[0041] Here, the easy-to-open portion is a portion in which a plurality of through holes or semi-through holes are formed in the resin film by pressing a tool having an uneven surface such as a metal blade or a file, or by irradiating a laser such as a carbon dioxide laser, a YAG laser, or a green laser, thereby forming scars on the surface of the resin film and reducing the tear strength of the film. In FIG. 7, as non-limiting examples of the scars, (a) multiple rows of perforated and staggered scars, (b) striped scars, and (c) random and fine scars are shown. In the case of providing the scars (a) to (c), the openability is the best in (c). The openability is related to the distance between the scars and the adjacent scars, and the openability of (c), which has the shortest distance, is the best. Note that (a) to (c) above are examples of scars forming the easy-to-open portion, and the present invention is not limited to these examples. In addition, the rectangular frame shown in FIG. 7 simply shows the outer edge of the illustrated range, and does not show the outer shape of the member.

[0042] FIG. 8 is a diagram for explaining the position where the easy-to-open portion is formed. The easy-to-open portion 141 is provided so as to overlap the end 131E of the notches 131A and 131B shown by the thick lines in FIG. 8(a) and (b), so that the tear can easily proceed from the position of only the laminated film not joined to the zipper tape 120 to the thin-walled portions 123A, 123B, and 123C of the zipper tape 120. Note that FIG. 8 illustrates the easy-to-open portion 141 by the scar of FIG. 7(a), but this is not limited to this example, and the easy-to-open portion by the scar of FIG. 7(b) and (c) and other may be formed. As in the illustrated example, the easy-to-open portion 141 may be provided linearly and continuously over the entire width of the bag body 110 along the longitudinal direction of the zipper tape 120 so as to include the end of the cutout 131 and the thin-walled portions 123A, 123B, and 123C of the zipper tape 120. In this case, the tear resistance remains low along the thin-walled portions 123A, 123B, and 123C over the entire width of the bag body 110, which is preferable because the bag can be easily torn. In addition, in this case, it is not necessary to align the end 131E of the notch 131 with the easy-opening portion in the longitudinal direction of the zipper tape 120 during manufacturing. In addition, since the easy-opening portion is also provided in the side seal portion 114 of the bag body 110, the easy-opening portion can also function as the opening start portion without providing a separate opening start portion (notch, etc.). The easy-opening portion and the scar of the opening start portion may be provided separately in the portion overlapping the end 131E of the notch 131 and in the side seal portion 114, respectively.

[0043] 9 is a cross-sectional view showing a modified example of an embodiment of the present invention. In the example shown in FIG. 1 , the second region R 2 and the third region R 3However, it does not cover the entire area of ​​the zipper tape 120 other than the base portions 125A, 125B and the engagement portions 126A, 126B. In the illustrated example, thin portions 127A, 127B are formed at the end of the zipper tape 120 on the thick portions 121A, 121B side, and thin portions 127C, 127D are formed between the thick portions 122A, 122B and the base portions 125A, 125B. It should be noted that the thin portions 127 are not intended to break when the bag 100 with zipper tape is opened. In such a case, the first region R 1 is defined as the region where the thick portion 121A and the thick portion 121B are formed (excluding the thin portions 127A and 127B). Similarly, the third region R 3 is defined as the region where the thick portion 122A and the thick portion 122B are formed (excluding the thin portions 127C and 127D). In the illustrated example, the thin portions 127A and 127B and the region closer to the end of the zipper tape 120 in the width direction than the thin portions 127A and 127B, and the region between the thin portions 127C and 127D and the base portions 125A and 125B are defined as the first region R. 1 , the second region R 2 and the third region R 3 is not included in any of the above.

[0044] FIG. 10 is a diagram showing another example of a cutout in an embodiment of the present invention. In the example shown in FIG. 10, among the cutouts 131A, 131B formed in the longitudinal end of the zipper tape 120 overlapping the side seal portion 114 (not shown), the cutout 131A formed on the side of the first portion 120A of the zipper tape 120 includes bulging portions 132C, 132D directed toward the thin portions 123A, 123B. On the other hand, the cutout 131B formed on the side of the second portion 120B of the zipper tape 120 includes a tapered portion 132E directed toward the thin portion 123C. By using such cutouts 131A, 131B, as in the example described above with reference to FIG. 5, when a user tries to tear the bag body starting from the longitudinal end of the zipper tape 120, the tearing of the bag body can be guided to proceed along the thin portion formed in the zipper tape 120. In another example, as shown in FIG. 11, the intermediate portions of the bulging portions 132C and 132D may have a shape without curvature.

[0045] Here, in this specification, the tapered portion is a portion in which the edges on both sides of the width direction of the notch are straight, and these straight lines form a taper that gradually narrows toward the thin portion. On the other hand, the bulge portion is a portion in which the shape of the notch protrudes toward the thin portion. As shown in the example of FIG. 10, the tip of the tapered portion can be given an R (radius of curvature). As already mentioned, by giving an R to the shape of the notch, even if there is some deviation in the position of the notch during processing, the tear can be guided to the thin portion, and the number of defective products can be reduced. When an R is given to the tip of the tapered portion, the tapered portion and the bulge portion have in common the fact that they include a portion with an R toward the thin portion. If there are straight edges forming a taper on both sides of the portion with an R, it is a tapered portion, and if both sides of the portion with an R are curved edges or are straight but do not form a taper, it is a bulge portion. For example, in the example of FIG. 10 above, the tapered portion 132E may be formed as a bulge portion.

[0046] In the case of the tip of the tapered portion, as in the above-mentioned example, R is, for example, 0.1 mm to 1.0 mm, preferably 0.2 mm to 0.7 mm. In the case of the bulging portion, R is, for example, 0.1 mm to 2.0 mm, preferably 0.1 to 1.5 mm, more preferably 0.1 mm to 1.0 mm, still more preferably 0.2 mm to 0.8 mm, and particularly preferably 0.2 mm to 0.7 mm.

[0047] 10, the first position P1 where the bulging portions 132C and 132D of the notch 131A are connected to the thin portions 123A and 123B is different from the second position P2 where the tapered portion 132E of the notch 131B is connected to the thin portion 123C in the longitudinal direction of the zipper tape 120. More specifically, in the illustrated example, the second position P2 is closer to the longitudinal end of the zipper tape 120 than the first position P1. With this configuration, the timing at which the tapered portion 132E starts tearing the thin portion 123C is shifted from the timing at which the bulging portions 132C and 132D start tearing the thin portions 123A and 123B, and the thin portions that are less resisted among the thin portions 123A and 123B can be selectively torn. 5, the position where the bifurcated tapered portion 132A of the cutout 131A is connected to the thin portions 123A, 123B may be different from the position where the tapered portion 132B of the cutout 131B is connected to the thin portion 123C. In the longitudinal direction of the zipper tape 120, the distance between the first position P1 and the second position P2 is preferably 1 mm or more.

[0048] FIG. 12 is a diagram showing yet another example of the cutout in the embodiment of the present invention. In the example shown in FIG. 12, the cutouts 131A, 131B formed at the longitudinal end of the zipper tape 120 overlapping the side seal portion 114 (not shown) include the bulging portions 132C, 132D and the tapered portion 132E. As a difference from the example shown in FIG. 10 above, in the example of FIG. 12, of the bulging portions 132C, 132D included in the cutout 131A, the bulging portion 132C bulges more toward the longitudinal center of the zipper tape 120 than the bulging portion 132D. As a result, the intermediate portion 133 between the bulging portions 132C, 132D has an asymmetric shape in the width direction of the zipper tape 120, unlike the example of FIG. 10. Specifically, the intermediate portion 133 is inclined with respect to the width direction of the zipper tape 120 from the bulging portion 132D to the bulging portion 132C. As a result, when the first portion 120A and the second portion 120B of the zipper tape 120 are overlapped, the middle portion 133 does not intersect at right angles with the thin portion 123C of the second portion 120B but intersects at an angle. This makes it possible to guide the tear to the bulge 132C and the thin portion 123A continuing to the bulge 132C not only when the tear in the bag body progresses toward the bulge 132C as shown by the arrow Q1 in Fig. 12, but also when the tear progresses toward the middle between the bulges 132C and 132D as shown by the arrow Q2.

[0049] 12, tearing of the bag body is guided toward thin-walled portion 123A on the side closer to top seal portion 112, but tearing may be guided toward thin-walled portion 123B on the side farther from top seal portion 112. Specifically, in the example of FIG. 12, bulging portion 132D may bulge more toward the center of zipper tape 120 in the longitudinal direction than bulging portion 132C.

[0050] 10 to 12, the first position P1 at which the bulges 132C and 132D are connected to the thin portion 123A in the first portion 120A of the zipper tape 120 is different from the second position P2 at which the tapered portion 132E is connected to the thin portion 123C in the second portion 120B, and the second position P2 is closer to the longitudinal end of the zipper tape 120 than the first position P1. The distance d between the first position P1 and the second position P2 is preferably 2 mm or more, more preferably 4 mm or more, and even more preferably 8 mm or more. The upper limit is preferably 50 mm or less, more preferably 30 mm or less, and even more preferably 20 mm or less.

[0051] In the embodiment described above, the first and second portions of the zipper tape are formed to have approximately the same width and are completely opposed to each other, but in other embodiments, one of the first and second portions of the zipper tape may be wider than the other, so that the first and second portions are partially opposed to each other.

[0052] In addition, although the above describes an example in which the container body is a bag-shaped bag body, the zipper tape may be joined to a container body other than a bag-shaped body to provide a container with zipper tape. In addition, although the above describes an example in which the first thick portion, the second thick portion, the thin portion, and the intermediate portion are continuously formed, for example, when not only the thick portion and the intermediate portion but also the thin portion is joined to the surface of the container body, the thin portion may be separated from the first thick portion, the second thick portion, or the intermediate portion at at least one location, and the tape or zipper tape may be provided as a combination of multiple long members.

[0053] 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]

[0054] 100...bag with zipper tape, 110...bag body, 110A...base material layer, 110B...metal layer, 110C...functional layer, 110D...sealant layer, 111A...first surface, 111B...second surface, 112...top seal portion, 113...bottom seal portion, 114...side seal portion, 115...notch, 120...zipper tape, 120A...first portion, 120B...second portion, 121A, 121B...first thick portion, 122A, 122B...Second thick part, 123A, 123B, 123C...Thin part, 124...Intermediate part, 125A, 125B...Base, 126A, 126B...Engaging part, 127A, 127B, 127C, 12 7D...Thin wall part, 131,131A,131B...Notch, 131E...End part, 132A,132B,132E...Tapered part, 132C,132D...Bulging part, 133...Middle part, 141...Easy to open part, R 1 …First region, R 2 …Second domain, R 3 ...The third area, SP...Storage space.

Claims

1. A container with zipper tape comprising a container body having at least a first surface and a second surface facing each other, and a zipper tape, the zipper tape includes, in a cross-sectional shape, a first portion and a second portion configured to at least partially oppose each other, at least a portion of the first portion being joined to the first surface, and at least a portion of the second portion being joined to the second surface; Each of the first and second portions includes, in a cross-sectional shape, a base portion and an engaging portion that protrudes from the base portion and is capable of engaging with each other; In the first portion, a thick portion is formed in the first region among a first region, a second region and a third region in the width direction of the zipper tape, a thick portion continuous with the base is formed in the third region, a first thin portion and a second thin portion are formed at both ends in the width direction of the second region located between the first region and the third region, and at least one intermediate portion is formed between the first thin portion and the second thin portion, In the second portion, the first region and the third region each have a thick portion extending beyond an end portion of the second region in the width direction, and the second region has at least one third thin portion facing the intermediate portion, side seal portions are formed at both ends of the container body where the first surface and the second surface are joined, and notches are formed at longitudinal ends of the zipper tape that overlap the side seal portions; the notch formed in the first portion includes a tapered or bulged portion directed toward the first thinned portion and the second thinned portion; the notch formed in the second portion includes a tapered or bulged portion directed toward the third thin-walled portion; In the laminate film constituting the first surface and the second surface, an easy-to-open portion consisting of a scar is provided at least in a portion of a resin film constituting an intermediate layer of the laminate film that overlaps an end of the notch. Container with zipper tape.

2. The container with zipper tape according to claim 1 , wherein the easy-open portion is provided linearly across the entire width of the container body along the longitudinal direction of the zipper tape.

3. 2. The container with zipper tape according to claim 1, wherein the laminated film includes a nylon layer as the intermediate layer.

4. 4. The container with zipper tape according to claim 3, wherein the laminated film has a laminated structure in which a PET layer, an aluminum layer, a nylon layer, and a linear low-density polyethylene layer are laminated in this order.

5. The container with zipper tape according to claim 1 , wherein the intermediate portion is formed to have a thickness corresponding to the thick portion.

6. the first thin portion, the second thin portion, and the third thin portion are formed to a thickness of 10 μm or more and 200 μm or less; 2. The container with zipper tape according to claim 1, wherein the thick-walled portions of the first region and the third region are formed to have a thickness of 200 μm or more and 700 μm or less.

7. 2. The container with zipper tape according to claim 1, wherein the first region, the second region, and the third region cover the entire region of the zipper tape except for the base portion and the engaging portion.

8. 2. The container with zipper tape according to claim 1, wherein the first portion and the second portion are connected to each other at a widthwise end of the first region opposite the second region or at a widthwise end of the base opposite the third region.

9. The container with zipper tape according to claim 1 , wherein the thickened portion and the intermediate portion of the first portion are joined to the first surface, and the thickened portion of the second portion is joined to the second surface.

10. The container with zipper tape according to claim 1 , wherein the container body is bag-shaped.

11. the notch formed in the first portion includes a first bulge and a second bulge directed toward the first thin portion and the second thin portion, respectively; 2. The zipper tape container according to claim 1, wherein the notch formed in the second portion includes a tapered portion directed toward the third thin-walled portion.

12. 12. The container with zipper tape according to claim 11, wherein the first bulge protrudes more toward the center of the zipper tape in the longitudinal direction than the second bulge protrudes.

13. the notch formed in the first portion includes a first tapered portion and a second tapered portion directed toward the first thinned portion and the second thinned portion, respectively; 2. The zipper tape container according to claim 1, wherein the notch formed in the second portion includes a tapered portion directed toward the third thin-walled portion.

14. 2. The container with zipper tape according to claim 1, wherein a first position in the longitudinal direction of the zipper tape where the tapered portion or the bulging portion is connected to the first thin-walled portion in the first portion is different from a second position in the second portion where the tapered portion or the bulging portion is connected to the third thin-walled portion.

15. The container with zipper tape according to claim 14 , wherein the second position is closer to an end of the zipper tape in the longitudinal direction than the first position.

16. 16. The container with zipper tape according to claim 15, wherein the distance between the first position and the second position is 2 mm or more and 50 mm or less.

17. forming the notch in the zipper tape; joining the zipper tape with the notch formed therein to the container body; forming the side seal portion across the notch on the container body to which the zipper tape is joined; A method for producing a container with a zipper tape according to any one of claims 1 to 16, comprising:

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