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

Abstract

To prevent weakening of an engagement strength at a hinge portion in a container with zipper tape that can be easily opened by sliding both surfaces of the container in a longitudinal direction of the zipper tape.SOLUTION: There is provided the container with zipper tape that includes a container body having at least a first region and a second region that face each other, and the zipper tape having a first base strip piece that is at least partially joined to the first region, a second base strip piece that is at least partially joined to the second region, and a first engaging portion and a second engaging portion that project from the first base strip piece and the second base strip piece respectively, and can engage with each other. A hinge is formed in at least one position where m / n<0.25, when a length of an opening of the container body is n and a distance to an inner end of an opening in a longitudinal direction of the zipper tape is m.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Bags with zipper tape are widely used for packaging various items such as medicines and food. One advantage of such bags with zipper tape is that they can be easily opened and resealed. A user can open the bag by pulling the two sides of the bag to which the zipper tape is attached apart from each other to disengage the zipper tape. Conversely, a user can press the two sides of the bag closer to each other to engage the zipper tape and reseal the bag.

[0003] When opening a bag with a zipper tape as described above, it is common for the user to pinch both sides of the bag with the fingers and pull them in a direction perpendicular to the longitudinal direction of the zipper tape. In this case, both hands are required for opening. In contrast, Patent Document 1 describes a technique that enables a user to open a bag by sliding both sides of the bag alternately along the longitudinal direction of the zipper tape. In this case, the user can release the engagement of the zipper tape and open the bag by pinching both sides of the bag with the fingers of one hand, specifically the thumb and index finger of one hand, and twisting them.

[0004] However, in the technology of the above-mentioned Patent Document 1, the user can easily perform the opening operation of disengaging the zipper tape by bending only one side of the bag on both sides of the pinched portion only when the zipper tape has a relatively low rigidity and is soft. Therefore, when the zipper tape is formed from a material with high rigidity in order to counter the internal pressure of the bag by strengthening the engagement or to prevent unintentional opening due to external force, it is not easy to bend the zipper tape, and therefore it is difficult to apply the technology of Patent Document 1.

[0005] In view of the above, a technology has been proposed as described in Patent Document 2. Patent Document 2 describes a bag with zipper tape, which includes a bag body having at least one pair of opposing surfaces, a pair of base strips respectively joined to the opposing surfaces, and a long zipper tape having in its cross-sectional shape at least one pair of engaging portions respectively protruding from the base strips and engaging with each other, the zipper tape having hinges formed at two positions in the longitudinal direction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] US Patent Application Publication No. 2003 / 0138171 [Patent Document 2] International Publication No. 2019 / 111911 Summary of the Invention [Problem to be solved by the invention]

[0007] According to the configuration described in the above Patent Document 2, the bag can be easily opened by sliding both sides of the bag in the longitudinal direction of the zipper tape, regardless of the rigidity of the zipper tape. However, when trying to prevent unintentional opening due to external force, for example, the engagement of the zipper tape is relatively weak at the hinge portion, and as a result, the function of preventing unintentional opening may not be fully exerted.

[0008] Therefore, the present invention aims to provide a container with zipper tape that can prevent the engagement strength at the hinge portion from becoming relatively weak in a container with zipper tape that can be easily opened by sliding both sides of the container in the longitudinal direction of the zipper tape, a manufacturing method for a container with zipper tape, and a manufacturing device for a container with zipper tape. [Means for solving the problem]

[0009] [1] A container with zipper tape comprising: a container body including at least a first region and a second region opposed to each other; a first base strip at least partially joined to the first region, a second base strip at least partially joined to the second region, and a zipper tape including first and second engagement portions protruding from the first and second base strips, respectively, and engageable with each other, wherein a hinge is formed at at least one position such that m / n<0.25, where n is the length of an opening of the container body and m is the distance to the inner end of the opening in the longitudinal direction of the zipper tape. [2] The container with zipper tape described in [1], wherein the hinge is formed at a position where the distance m to the inner edge of the opening is 20 mm or less. [3] A container with a zipper tape according to [1] or [2], in which the engagement strength of the portion of the zipper tape excluding the hinge is 26 N / 50 mm or more. [4] A container with a zipper tape described in any one of [1] to [3], wherein the hinge includes a thin-walled portion or a cut-out portion formed in the first and second engagement portions. [5] A container with a zipper tape described in any one of [1] to [3], wherein the hinge includes a punched hole passing through the first and second base strips and the first and second engagement portions. [6] A container with a zipper tape described in any one of [1] to [5], wherein an anti-slip structure is formed on at least one of the surface opposite to the surface to which the first base strip of the first region is joined and the surface opposite to the surface to which the second base strip of the second region is joined. [7] A container with a zipper tape described in any one of [1] to [6], wherein an opening is formed in the container body on one side in the width direction of the zipper tape, and the first base strip is not joined to the first region on the opening side of the first engagement portion in the width direction. [8] A container with a zipper tape described in any one of [1] to [7], wherein the zipper tape further includes third and fourth engagement portions protruding from the first and second base strips, respectively, and capable of engaging with each other. [9] A container with a zipper tape described in any one of [1] to [8], wherein the container body is bag-shaped.

[10] A method for producing a container with zipper tape, comprising the steps of supplying a zipper tape including first and second base strips and first and second engaging portions projecting from the first and second base strips, respectively, and engageable with each other, joining the first and second base strips to first and second opposing regions of a film, respectively, and cutting the film to form a container body, further comprising the step of forming a hinge at least at a position such that m / n<0.25, where n is the length of an opening of the container body and m is the distance to an inner end of the opening in the longitudinal direction of the zipper tape.

[11] The method for producing a container with zipper tape according to

[10] , wherein the step of forming the hinge is performed between the steps of supplying the zipper tape and joining the first and second base strips to the first and second regions, respectively.

[12] The method for manufacturing a container with a zipper tape described in

[10] , wherein the step of forming the hinge is performed after the steps of joining the first and second base strips to the first region and the second region, respectively.

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

[12] , further comprising the step of joining the first region and the second region to each other at joining regions at both longitudinal ends of the zipper tape, wherein in the step of forming a container body, the film is cut along the joining regions, and the step of forming a hinge comprises the step of forming a hinge by a forming means positioned across the joining regions.

[14] The method for manufacturing a container with a zipper tape described in any one of

[10] to

[13] , wherein the step of supplying the zipper tape includes a step of guiding the zipper tape using a cylindrical guide member.

[15] An apparatus for manufacturing a container with zipper tape, comprising: means for supplying a zipper tape including first and second base strips, and first and second engaging portions protruding from the first and second base strips, respectively, and capable of engaging with each other; means for joining the first and second base strips to first and second opposing regions, respectively, of a film; and means for cutting the film to form a container body, further comprising means for forming a hinge at least at a position such that m / n<0.25, where n is the length of an opening of the container body and m is the distance to the inner end of the opening in the longitudinal direction of the zipper tape.

[16] The manufacturing apparatus for a container with a zipper tape according to

[15] , wherein the means for supplying the zipper tape includes a cylindrical guide member capable of guiding the zipper tape therein.

[17] The apparatus for manufacturing a container with a zipper tape as described in

[16] , wherein the means for joining the first and second base strips to the opposing first and second regions of the film, respectively, does not include a plate interposed between the first and second base strips.

[18] An apparatus for manufacturing a container with a zipper tape according to any one of

[15] to

[17] , further comprising means for joining the first region and the second region to each other at joining regions at both longitudinal ends of the zipper tape, wherein the means for forming the container body cuts the film along the joining regions, and the means for forming the hinge includes forming means positioned across the joining regions. Effect of the Invention

[0010] In this embodiment, the hinge is formed at least at one position where m / n<0.25, where n is the length of the opening of the container body and m is the distance to the inner end of the opening in the longitudinal direction of the zipper tape. In the joining region, the base strips of the zipper tape are joined and fixed to each other, so that the engagement strength of the engagement part is relatively high in the part close to the joining region in the longitudinal direction of the zipper tape compared to other parts. By forming the hinge at the above position, the engagement strength in the sections on both sides of the hinge is relatively high, so that it is possible to compensate for the decrease in engagement strength caused by the change in the shape of the engagement part by the hinge. This makes it possible to prevent the engagement strength of the hinge from becoming relatively weak in the bag with the zipper tape. [Brief description of the drawings]

[0011] [Figure 1] 1 is a plan view of a bag with a zipper tape according to a first embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view of the zipper tape bag shown in FIG. 1 taken along line II-II. [Diagram 3] 5A to 5C are diagrams for explaining a thin-walled portion formed in the bag with zipper tape in the present embodiment and its function. [Figure 4] FIG. 11 is a plan view of a bag with a zipper tape according to a second embodiment of the present invention. [Diagram 5] FIG. 11 is a plan view of a bag with a zipper tape according to a third embodiment of the present invention. [Figure 6] 1 is a cross-sectional view showing an example of a zipper tape that prevents unintentional opening. [Figure 7] FIG. 11 is a cross-sectional view showing yet another example of a zipper tape. [Figure 8] 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 9] 1A to 1C are diagrams illustrating examples of means for forming a hinge in an embodiment of the present invention. [Figure 10] 5A to 5C are diagrams illustrating examples of a guide member according to an embodiment of the present invention. [Figure 11]5A to 5C are diagrams illustrating examples of a guide member according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] 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 description will be omitted.

[0013] (First embodiment) Fig. 1 is a plan view of a bag with a zipper tape according to a first embodiment of the present invention, Fig. 2 is a cross-sectional view of the bag with the zipper tape shown in Fig. 1 taken along line II-II.

[0014] 1 and 2, the zipper tape bag 100 includes a film 110 and a zipper tape 120. The film 110 forms a bag body including a first region 111A and a second region 111B facing each other. The zipper tape 120 includes a base strip 121A at least partially joined to the first region 111A, a base strip 121B at least partially joined to the second region 111B, and a pair of engagement portions 122 (engagement portions 122A, 122B) that protrude from the base strips 121A, 121B, respectively, and are engageable with each other.

[0015] The film 110 is formed of, for example, a single-layer or multi-layer thermoplastic resin. Specifically, the thermoplastic resin may be low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or polypropylene (PP). PP may be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). When the film 110 is a multi-layer film, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), or biaxially oriented nylon (ONy) may be used for the surface substrate. These are not limited to fossil fuel-derived resins, 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 film 110 may also include a layer of a metal material such as aluminum, or an inorganic material. For example, by making the film 110 and the zipper tape 120 into a mono-material of a resin composition mainly composed of polyethylene, an environmentally friendly configuration with excellent recyclability can be achieved.

[0016] The thickness of the film 110 is, for example, 20 μm or more, preferably 35 μm or more, and more preferably 50 μm or more. The thickness of the film 110 is, for example, 300 μm or less, preferably 200 μm or less, and more preferably 180 μm or less.

[0017] In this embodiment, two films 110 are overlapped and joined to each other at the bottom seal 112 and the side seal 113 to form the first region 111A and the second region 111B, but in another embodiment, for example, one film 110 may be folded back at a portion corresponding to the bottom seal 112 and joined to each other at the side seal 113. The side seals 113 are formed at both ends in the longitudinal direction of the zipper tape 120 and are joining regions where the first region 111A, base strips 121A and 121B of the zipper tape 120, and the second region 111B are overlapped in this order and joined to each other.

[0018] Also, a so-called gusset may be formed where the film is folded inward at a portion corresponding to bottom seal 112 or side seal 113. In this case, the gusset may be formed of the same film as first region 111A or second region 111B, or may be formed of a film different from these. Also, zipper tape-attached bag 100 may be a standing pouch that can be placed upright by forming a gusset at the bottom.

[0019] In this embodiment, a bottom seal 112 and a side seal 113 are formed while a top seal is not formed, thereby forming an opening in the bag body; however, in another embodiment, a top seal is formed in addition to the bottom seal and side seal, and it may be possible to later form an opening in the bag body by cutting between the top seal and the zipper tape.

[0020] In yet another embodiment, the zipper tape bag may be provided without a bottom seal on the opposite side of the zipper tape, which is formed after the bag is filled with contents. In addition, the present invention can be applied to various other known zipper tape bag configurations.

[0021] The zipper tape 120 is formed by extrusion molding of, for example, a polyolefin resin. More specifically, the zipper tape 120 may be formed of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). PP may be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). These 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 material of the zipper tape 120 may be added with known additives, such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants, as necessary.

[0022] The zipper tape 120 may be mono-materialized with a resin composition mainly composed of polyethylene. In this case, the zipper tape 120 is entirely formed of 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 if the content of the main component is 100%, mixing of additives and impurities is permitted. The main component can be confirmed by, for example, an 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 biopolyethylene as the polyethylene, an environmentally friendly configuration with even excellent recyclability is possible.

[0023] In the zipper tape 120, the shapes of the engagement parts 122A, 122B are not limited to the illustrated example, and may be any of various known zipper shapes that combine claw, hook, or knob shapes. In the illustrated example, the engagement part 122A is male and the engagement part 122B is female, but they may be reversed. In the illustrated example, one pair of engagement parts is provided, but multiple pairs of engagement parts may be provided.

[0024] Fig. 3 is a diagram for explaining the thin-walled portion formed in the bag with zipper tape in this embodiment and its function. Fig. 3 is a cross-sectional view of the bag with zipper tape shown in Fig. 1 and Fig. 2 taken along line III-III. As shown in Fig. 1 and Fig. 3(A), in the bag with zipper tape 100 according to this embodiment, thin-walled portions 131A, 131B are formed in a portion including the engaging portion 122 of the zipper tape 120. The thin-walled portions 131A, 131B are formed by thinning the engaging portions 122A, 122B of the zipper tape 120 together with the base strips 121A, 121B and the film 110 forming the bag body, for example, by pressing as described later.

[0025] In this embodiment, the engaging portions 122A, 122B having an uneven cross-sectional shape in the zipper tape 120 are thinned, so that the thin portions 131A, 131B function as hinges of the zipper tape 120. In this specification, the hinge means a point where a bending moment is not transmitted or is relatively weakened in the longitudinal direction of the zipper tape 120, so that the deflection angle of the zipper tape 120 becomes discontinuous. Therefore, the hinge allows the zipper tape 120 to be easily bent.

[0026] 3(A), in this embodiment, such hinges are formed as thin-walled portions 131A and 131B at two positions in the longitudinal direction of the zipper tape 120. Here, the thin-walled portions 131A and 131B are formed at positions close to both ends of the zipper tape 120 in the longitudinal direction.

[0027] Here, the thin-walled parts 131A and 131B are formed at positions where m / n<0.25, where n is the length of the opening of the bag body, and m is the distance to the inner end of the opening in the longitudinal direction of the zipper tape (both ends of the section of length n). Preferably, m / n≦0.22, more preferably m / n≦0.20, even more preferably m / n≦0.16, and particularly preferably m / n≦0.12. The lower limit of m / n may be 0, but m / n≧0.01 or more is preferable, m / n≧0.03 or more is more preferable, and m / n≧0.05 or more is even more preferable. By setting it in this range, both the ease of opening and the function of preventing unintentional opening with a higher degree of certainty can be achieved. Here, the length n of the opening of the bag body is, for example, 30 mm or more, preferably 50 mm or more, and more preferably 70 mm or more. Also, the length n of the opening of the bag body is, for example, 500 mm or less, preferably 400 mm or less, and more preferably 350 mm or less.

[0028] The thin portions 131A and 131B may be formed at positions in the longitudinal direction of the zipper tape 120 where the distance m to the side seal 113, which is the joining region, is 20 mm or less. Here, the distance m is the distance from the edge of the side seal 113 on the side closer to each of the thin portions 131A and 131B to the edge of the thin portions 131A and 131B on the opposite side to the side seal 113. In other words, the regions where the thin portions 131A and 131B are formed are within the range of the distance m from the edge of the side seal 113 on the closer side. The distance m is preferably 18 mm or less, more preferably 15 mm or less, and even more preferably 12 mm or less. In addition, the distance m may be 0 mm, but from the viewpoint of openability, it is preferably 3 mm or more, more preferably 5 mm or more, and more preferably 7 mm or more. The distances m may be the same value or may be different values.

[0029] 3B, when the first region 111A and the second region 111B of the film 110 are slid in different directions along the longitudinal direction of the zipper tape 120 near the middle of the thin portions 131A and 131B, the engaging portion 122B is bent away from the engaging portion 122A in the thin portion 131A, and the engaging portion 122A is bent away from the engaging portion 122B in the thin portion 131B. As a result, the engaging portion 122A and the engaging portion 122B are disengaged near the thin portions 131A and 131B. For example, by inserting a finger or the like into the opening formed near the thin portions 131A and 131B at this time and pushing it open, the engaging portions 122A and 122B are disengaged over the entire zipper tape 120, and the bag with zipper tape 100 can be opened.

[0030] In order to facilitate the above-mentioned opening operation, as shown in Fig. 1, a non-slip structure 140 may be formed on the surface of the zipper tape 120 of the first region 111A and the second region 111B opposite to the surface where the base strips 121A, 121B are joined. The non-slip structure 140 may be formed, for example, between two positions where the thin-walled parts 131A, 131B are formed as in the illustrated example. Alternatively, the non-slip structure 140 may be formed over the entire length of the zipper tape 120 including the thin-walled parts 131A, 131B. Specifically, the non-slip structure 140 may be a roughened or embossed surface treatment for increasing the coefficient of friction between the film 110 and the user's fingers, or an adhesive treatment.

[0031] In this embodiment, the thin-walled parts 131A, 131B are formed at positions where m / n<0.25, where n is the length of the opening of the bag body and m is the distance to the inner end of the opening in the longitudinal direction of the zipper tape. Since the base strips 121A, 121B of the zipper tape 120 are fixed in a joined state to each other in the side seal 113 forming the inner end of the opening, the engagement strength of the engagement part 122 is relatively high in the part close to the side seal 113 in the longitudinal direction of the zipper tape 120 compared to other parts. By forming the thin-walled parts 131A, 131B at the above positions, the engagement strength in the sections on both sides of the thin-walled parts 131A, 131B is relatively high, so that it is possible to compensate for the decrease in engagement strength caused by the change in shape of the engagement part 122 at the thin-walled parts 131A, 131B. Therefore, in this embodiment, it is possible to prevent the engagement strength of the thin-walled portions 131A, 131B in the zipper tape-attached bag 100 from becoming relatively weak.

[0032] Specifically, for example, if the engagement strength of the zipper tape 120 in a section not including either the thin wall portions 131A or 131B is 26 N / 50 mm or more, it is possible to prevent the bag 100 with the zipper tape from being unintentionally opened starting from the thin wall portions 131A or 131B. The engagement strength of the zipper tape 120 in a section not including either the thin wall portions 131A or 131B is preferably 30 N / 50 mm or more, more preferably 40 N / 50 mm or more. The engagement strength can be measured as follows, for example, using a digital force gauge (manufactured by Imada Co., Ltd.). First, the base strips 121A and 121B are held at a portion 2 mm from the engagement portion of the zipper tape cut to 50 mm in the longitudinal direction. Next, while the base strip 121A is fixed, the base strip 121B is pulled up and the strength until the engagement of the engagement portion 122 is released is measured, and the measurement result at the maximum load is taken as the engagement strength. If the length in the longitudinal direction is less than 50 mm, then assuming that the length is X mm, the measurement result N / X mm can be multiplied by 50 / X to convert it to N / 50 mm.

[0033] Second embodiment FIG. 4 is a plan view of a bag with a zipper tape according to the second embodiment of the present invention. As shown in the figure, in the bag with a zipper tape 200 according to this embodiment, the cutouts 132A and 132B are formed in a portion including the engaging portion 122 of the zipper tape 120. In the example shown in the figure, the cutouts 132A and 132B are formed on both sides of the bag with a zipper tape 200. Specifically, the cutout 132A is formed from the first region 111A of the film 110 to the base strip 121A and the engaging portions 122A and 122B of the zipper tape 120, and the cutout 132B is formed from the second region 111B of the film 110 to the base strip 121B and the engaging portions 122A and 122B of the zipper tape 120. The configuration of the bag with a zipper tape 200 other than the above is the same as that of the bag with a zipper tape 100 according to the first embodiment described above.

[0034] In this embodiment, the cuts 132A and 132B that reach the engagement parts 122A and 122B having uneven cross-sectional shapes in the zipper tape 120 function as hinges of the zipper tape 120. As already described in the first embodiment, the hinges allow the zipper tape 120 to be easily bent. As in the first embodiment, the cuts 132A and 132B are formed in positions close to both ends in the longitudinal direction of the zipper tape 120. Specifically, the cuts 132A and 132B are formed in positions in the longitudinal direction of the zipper tape 120 where the distance m to the side seal 113, which is the joining region, is 20 mm or less. The definition of the distance m is the same as in the first embodiment, and the regions where the cuts 132A and 132B are formed are within the range of the distance m from the edge of the side seal 113 on the closer side.

[0035] In the second embodiment of the present invention described above, as in the first embodiment, the cuts 132A and 132B formed in the zipper tape 120 function as hinges, so that even if the zipper tape 120 is made of a material with a relatively high rigidity, it is easy to bend one of the engagement parts 122A and 122B of the zipper tape 120 at the cuts 132A and 132B. Also in this embodiment, the cuts 132A and 132B are formed at positions where m / n<0.25 is satisfied, where n is the length of the opening of the bag body and m is the distance to the inner end of the opening in the longitudinal direction of the zipper tape, so that the reduction in engagement strength caused by the loss of the engagement part 122 at the cuts 132A and 132B can be compensated for. Therefore, in this embodiment, it is possible to prevent the engagement strength at the cuts 132A and 132B from becoming relatively weak in the zipper tape-attached bag 200.

[0036] (Third embodiment) FIG. 5 is a plan view of a bag with a zipper tape according to the third embodiment of the present invention. As shown in the figure, in the bag with a zipper tape 300 according to this embodiment, punch holes 133A and 133B are formed in a portion including the engaging portion 122 of the zipper tape 120. In the example shown in the figure, the punch holes 133A and 133B are formed penetrating the zipper tape 120, respectively. Specifically, the punch holes 133A and 133B are formed penetrating the base strip 121A, the engaging portions 122A and 122B, and the base strip 121B of the zipper tape 120 by a process performed before joining the zipper tape 120 to the film 110, for example, as described later. The configuration of the bag with a zipper tape 300 other than the above is the same as that of the bag with a zipper tape 100 according to the first embodiment described above.

[0037] In this embodiment, punch holes 133A, 133B penetrating the engagement parts 122A, 122B having uneven cross-sectional shapes in the zipper tape 120 function as hinges of the zipper tape 120. As already described in the first embodiment, the hinges can easily bend the zipper tape 120. As in the first embodiment, the punch holes 133A, 133B are formed in positions close to both ends in the longitudinal direction of the zipper tape 120. Specifically, the punch holes 133A, 133B are formed in positions in the longitudinal direction of the zipper tape 120 where the distance m to the side seal 113, which is the joining region, is 20 mm or less. The definition of the distance m is the same as in the first embodiment, and the regions where the punch holes 133A, 133B are formed are within the range of the distance m from the edge of the side seal 113 on the closer side.

[0038] In the third embodiment of the present invention described above, similarly to the first embodiment, the punch holes 133A, 133B formed in the zipper tape 120 function as hinges, so that even if the zipper tape 120 is made of a material with a relatively high rigidity, it is easy to bend one of the engagement parts 122A, 122B of the zipper tape 120 at the punch holes 133A, 133B. Also in this embodiment, the punch holes 133A, 133B are formed at positions where m / n<0.25 is satisfied, where n is the length of the opening of the bag body and m is the distance to the inner end of the opening in the longitudinal direction of the zipper tape, so that it is possible to compensate for the decrease in engagement strength caused by the loss of the engagement part 122 at the punch holes 133A, 133B. Therefore, in this embodiment, it is possible to prevent the engagement strength at the punch holes 133A, 133B from becoming relatively weak in the zipper tape-attached bag 300.

[0039] In the above embodiments, examples have been described in which hinges are formed at two positions where m / n<0.25, where n is the length of the opening of the bag body at each of both ends of the zipper tape and m is the distance to the inner end of the opening in the longitudinal direction of the zipper tape, but the hinge may be formed at only one position at either of both ends of the zipper tape. Also, in the above embodiments, examples have been described in which the container body is bag-shaped, but a container with zipper tape may be provided that includes a container body other than a bag-shaped one and a zipper tape.

[0040] (Example of zipper tape to prevent unintentional opening) FIG. 6 is a cross-sectional view showing an example of a zipper tape that can be used in the first to third embodiments, for example, to prevent unintentional opening. In the illustrated example, the base strip 121C on the side of the male engaging portion 122A does not extend further toward the opening side than the engaging portion 122A in the width direction of the zipper tape. Therefore, the base strip 121C is not joined to the first region 111A of the film 110 on the opening side than the engaging portion 122A in the width direction of the zipper tape. As a result, even if the film 110 is pinched on the opening side than the zipper tape, no force is applied in the direction to release the engagement of the engaging portion 122, making it difficult to open the bag with zipper tape 100 by a normal method. Even in such a case, the bag with zipper tape 100 can be opened by the method described above with reference to FIG. 3, so the configuration of the zipper tape as shown in FIG. 6 is effective in preventing unintentional opening of the bag with zipper tape 100.

[0041] FIG. 7 is a cross-sectional view showing yet another example of the zipper tape. For example, the zipper tape shown in FIG. 6 may further include engaging portions 122C, 122D that protrude from the base strip 121C and the base strip 121B, respectively, and are engageable with each other. In this case, the zipper tape is engaged by two sets of engaging portions, 122A, 122B and 122C, 122D, so that the engagement strength can be increased. This structure is effective when opening is made difficult by not joining the base strip 121C on one side to the first region 111A of the film 110 on the opening side of the engaging portion 122A in the width direction of the zipper tape, as in the illustrated example, but may also be adopted when both base strips are joined to the film on both sides in the width direction, as in the example shown in FIG. 2. From the viewpoint of openability, it is preferable that the engagement parts 122C and 122D have hinges such as the thin parts 131A and 131B, the cut parts 132A and 132B, or the punch holes 133A and 133B described above. However, in order to achieve both higher sealing and openability, it is also possible to form hinges only on the engagement parts 122A and 122B on the opening side and not on the engagement parts 122C and 122D on the storage space side. Alternatively, it is also possible to arrange the engagement parts 122C and 122D on which no hinges are formed on the opening side and the engagement parts 122A and 122B on which hinges are formed on the storage space side, in the opposite manner to the illustrated example. In addition, when hinges are formed on both the engagement parts 122A and 122B and the engagement parts 122C and 122D, the values ​​of m for both may be different, but it is preferable that they have the same value from the viewpoint of realizing smoother openability.

[0042] (Manufacturing method of bags with zipper tape) FIG. 8 is a perspective view of a three-sided bag making machine for manufacturing a bag with a zipper tape according to an embodiment of the present invention. As shown in the figure, in the three-sided bag making machine 600, a film supplying section 601 unwinds the film 110 wound around a film roll 602, and cuts it in the width direction using a cutting blade (not shown) to form a pair of opposing portions (first region 111A and second region 111B). Meanwhile, a tape supplying section 603 unwinds the zipper tape 120 wound around a tape roll 604, and supplies it to a predetermined position between the first region 111A and the second region 111B of the film 110 using a guide member (not shown). A seal bar 605 bonds the base strips 121A and 121B of the zipper tape 120 to the first region 111A and the second region 111B of the film 110, respectively. For bonding, heat sealing, ultrasonic welding, or bonding using an adhesive is used.

[0043] After the zipper tape 120 is joined to the film 110, a bottom seal 112 is formed between the first region 111A and the second region 111B by a seal bar 606, and similarly a side seal 113 is formed by a seal bar 607. The bag with zipper tape 100 is manufactured through a process of forming a bag body from the film 110 using a cutting blade 608 that cuts the film 110 in the longitudinal direction along the bottom seal 112 and a cutting blade 609 that cuts the film 110 in the width direction along the side seal 113. The same applies to the bags with zipper tape 200 and 300 according to the second and third embodiments.

[0044] Here, FIG. 8 does not show means for forming hinges such as the thinned portions 131A, 131B, the cut portions 132A, 132B, or the punched holes 133A, 133B in the zipper tape 120. The means for forming the hinges is disposed, for example, at any of the portions indicated by the arrows P1 to P4 shown in FIG. 8. The arrow P1 is located between the tape supplying portion 603 for supplying the zipper tape 120 and the seal bar 605 for joining the base strips 121A, 121B of the zipper tape 120 to the first region 111A and the second region 111B of the film 110. The arrow P2 is located behind the seal bar 605 and before the seal bar 606 for forming the bottom seal 112. The arrow P3 is located behind the seal bar 606 and before the seal bar 607 for forming the side seal 113, and the arrow P4 is located behind the seal bar 607.

[0045] Fig. 9 is a diagram showing an example of a hinge forming means in an embodiment of the present invention. In the illustrated example, at the position of arrow P4 shown in Fig. 8, i.e., at the position after the side seal 113 is formed between the first region 111A and the second region 111B of the film 110, the first region 111A and the second region 111B are pressed from both sides using pressers 610A and 610B having protrusions 611 (protrusions 611A and 611B) to form the thin-walled parts 131A and 131B of the zipper tape-attached bag 100 according to the first embodiment. By carrying out such pressing processing, the engaging part 122 of the zipper tape 120 is thinned while maintaining its shape, and the thin-walled parts 131A and 131B can be formed while maintaining the sealing function of the zipper tape 120.

[0046] In the illustrated example, before the film 110 is cut along the side seal 113, the pressers 610A and 610B are arranged to straddle the side seal 113. This allows the thin-walled portions 131A and 131B to be efficiently formed when the thin-walled portions 131A and 131B are formed in positions close to the side seal 113, specifically when the thin-walled portions 131A and 131B are formed in positions where m / n<0.25 is satisfied, where n is the length of the opening of the bag body and m is the distance to the inner end of the opening in the longitudinal direction of the zipper tape. For example, even when the width of the bag 100 with zipper tape is changed, the thin-walled portions 131A and 131B can be formed using the same pressers 610A and 610B. In other words, in this embodiment, by forming hinges such as thin-walled portions 131A and 131B close to the ends, the distance from the end of the bag body to the hinges becomes constant if the width of bag 100 with zipper tape does not change significantly, and the hinges can be formed with the same jig regardless of the width of the bag. In other examples, hinges may be formed with different jigs for each width of bag 100 with zipper tape, or the hinges on both sides may be formed with different jigs.

[0047] In the above example, the thin-walled parts 131A and 131B are formed using the protrusion 611. Similarly, by providing a cutting blade instead of the protrusion 611, the cut-out parts 132A and 132B of the bag with zipper tape 200 according to the second embodiment can be formed. Also, by providing a punch instead of the protrusion 611 and providing a die hole having a shape corresponding to the punch at a position opposite the punch, the punched holes 133A and 133B of the bag with zipper tape 300 according to the third embodiment can be formed. In the illustrated example, the thin-walled part 131A is formed by pressing from the first region 111A side, and the thin-walled part 131B is formed by pressing from the second region 111B side, but both the thin-walled parts 131A and 131B may be formed by pressing from either the first region 111A side or the second region 111B side, or both.

[0048] 8, the hinge is formed in the zipper tape 120 at the position of the arrow P4, but it is also possible to form the hinge at any of the positions of the arrows P1 to P3. For example, when forming the hinge at the position of the arrow P1, the hinge can be formed in the zipper tape 120 without affecting the film 110, because the hinge is formed before the zipper tape 120 is joined to the film 110. For example, when forming the punched holes 133A and 133B as in the third embodiment, it is preferable to form the zipper tape 120 before it is joined to the film 110 in order to ensure the strength and sealability of the bag body. On the other hand, when hinges are formed at the positions of arrows P2 to P4, for example, thin portions 131A, 131B and cut portions 132A, 132B are also formed in the film 110, but since the hinges are formed in a process close to the process in which the side seal 113 is formed between the first region 111A and the second region 111B, the accuracy of alignment between the hinges and the side seal 113 (i.e., the end of the zipper tape 120) is improved.

[0049] In the above example, the bag with the zipper tape was manufactured by a three-side bag making machine, but this is not limited to a three-side bag making machine. Various other bag making machines can also manufacture a bag with the zipper tape, in which a hinge is formed in the zipper tape, by incorporating an apparatus such as that described with reference to Figure 9 between the step of supplying the zipper tape and the step of joining the zipper tape to the film, or after the step of joining the zipper tape to the film.

[0050] Figures 10 and 11 are diagrams showing examples of a device for guiding a zipper tape in an embodiment of the present invention. Both figures show an example of a zipper tape in which one base strip 121C is not joined to the first region 111A of the film 110 on the opening side of the engagement portion 122A as described above with reference to Figure 6, but the configurations shown in Figures 10 and 11 are also applicable to other zipper tapes. Each figure shows as (A) a configuration for guiding the zipper tape at the front portion of the seal bar 605 shown in Figure 8, and as (B) a configuration of the seal bar 605 portion.

[0051] 10A, the zipper tape is guided using plates 651, 652 that are interposed between the first region 111A and the second region 111B of the film 110 and between the base strips 121B and 121C of the zipper tape. The widthwise positions of the engagement portions 122A, 122B of the zipper tape are fixed between the plates 651 and 652, thereby positioning the zipper tape relative to the film 110. As shown in (B), in the portion shown as the seal bar 605 in FIG. 8, the seal bar 653A sandwiches the first region 111A and the base strip 121C between the plates 651, 652, and the seal bar 653B sandwiches the second region 111B between the plates 651, 652, thereby joining the zipper tape to the film 110.

[0052] 11A, the zipper tape is guided inside a cylindrical guide member 654 disposed between the first region 111A and the second region 111B of the film 110. The widthwise position of the base strip 121B is fixed between the side walls of the guide member 654, thereby positioning the zipper tape relative to the film 110. As shown in (B), in the portion shown as the seal bar 605 in FIG. 8, the seal bars 653A and 653B sandwich the first region 111A and the second region 111B, as well as the base strips 121B and 121C disposed therebetween, thereby joining the zipper tape to the film 110.

[0053] 11 may be effective when it is not necessary to sandwich a plate between the seal bars 653A, 653B due to conditions such as the sealing temperature. Also, when the flange portion projecting from the engaging portion 122A of one of the base strips 121C is short or not formed as in the illustrated example, the zipper tape can be positioned more reliably by using a cylindrical guide member 654 rather than the plates 651, 652. The guide member 654 does not necessarily have to have a rectangular cross section as illustrated, and may have, for example, a polygonal cross section other than a rectangle, or may have a U-shaped cross section with the upper or lower portions open in the figure.

[0054] 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 amended 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]

[0055] 100, 200, 300...bag with zipper tape, 110...film, 111A...first region, 111B...second region, 112...bottom seal, 113...side seal, 120...zipper tape, 121A, 121B, 121C...base strip, 122, 122A, 122B...engagement portion, 131A, 131B...thin portion, 132A, 132B...notch portion, 133A, 133B...punched hole, 140...anti-slip structure, 600...three-sided bag making machine, 601...film supply section, 602...film roll, 603...tape supply section, 604...tape roll, 605, 606, 607...seal bar, 608, 609...cutting blade, 610A, 610B...pressure element, 611, 611A, 611B...protrusion, 651, 652...plate, 653A, 653B...seal bar, 654...guide member.

Claims

1. A container body including at least a first region and a second region opposed to each other; a zipper tape including a first base strip at least partially joined to the first region, a second base strip at least partially joined to the second region, and first and second engagement portions projecting from the first and second base strips, respectively, and capable of engaging with each other; Equipped with A container with a zipper tape, wherein a hinge is formed at least at one position such that m / n<0.25, where n is the length of an opening of the container body and m is the distance to an inner end of the opening in the longitudinal direction of the zipper tape.

2. 2. The container with zipper tape according to claim 1, wherein the hinge is formed at a position where a distance m to an inner edge of the opening is 20 mm or less.

3. 3. The container with zipper tape according to claim 1, wherein an engagement strength of a portion of the zipper tape not including the hinge is 26 N / 50 mm or more.

4. The container with zipper tape according to claim 1 , wherein the hinge includes a thinned portion or a cutout portion formed in the first and second engagement portions.

5. 4. The container with zipper tape of claim 1, wherein the hinge includes punched holes through the first and second base strips and the first and second mating portions.

6. 6. The container with zipper tape according to claim 1, wherein an anti-slip structure is formed on at least one of a surface of the first region opposite to a surface to which the first base strip is joined and a surface of the second region opposite to a surface to which the second base strip is joined.

7. An opening is formed in the container body on one side in the width direction of the zipper tape, The container with zipper tape according to claim 1 , wherein the first base strip is not joined to the first region on a side closer to the opening than the first engagement portion in the width direction.

8. 8. The container with zipper tape according to claim 1, wherein the zipper tape further includes third and fourth engagement portions protruding from the first and second base strips, respectively, and engageable with each other.

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

10. providing a zipper tape including first and second base strips and first and second engaging portions projecting from the first and second base strips, respectively, and engageable with each other; bonding the first and second base strips to opposing first and second regions of a film, respectively; cutting the film to form a container body; A method for producing a container with a zipper tape, comprising: The method for manufacturing a container with a zipper tape further includes a step of forming a hinge at least at one position where m / n<0.25, where n is a length of an opening of the container body and m is a distance to an inner end of the opening in the longitudinal direction of the zipper tape.

11. 11. The method of claim 10, wherein the step of forming the hinge is performed between the steps of providing the zipper tape and joining the first and second base strips to the first and second regions, respectively.

12. 11. The method of claim 10, wherein the step of forming the hinge is performed after the steps of joining the first and second base strips to the first and second regions, respectively.

13. The method further includes a step of joining the first region and the second region to each other at joining regions at both ends of the zipper tape in a longitudinal direction, In the step of forming the container body, the film is cut along the joining region, The method for manufacturing a container with a zipper tape according to claim 12, wherein the step of forming the hinge includes the step of forming the hinge with a forming means disposed so as to straddle the joining region.

14. 14. The method for manufacturing a container with a zipper tape according to claim 10, wherein the step of supplying the zipper tape includes a step of guiding the zipper tape using a cylindrical guide member.

15. a means for supplying a zipper tape including first and second base strips and first and second engaging portions projecting from the first and second base strips, respectively, and engageable with each other; means for joining the first and second base strips to opposed first and second regions of the film, respectively; A means for cutting the film to form a container body; A manufacturing apparatus for a container with a zipper tape, comprising: the zipper tape-attached container manufacturing apparatus further comprising a means for forming a hinge at least at a position where m / n<0.25 is satisfied, where n is a length of an opening of the container body and m is a distance to an inner end of the opening in the longitudinal direction of the zipper tape.

16. 16. The manufacturing apparatus for a container with a zipper tape according to claim 15, wherein the means for supplying the zipper tape includes a cylindrical guide member capable of guiding the zipper tape inside.

17. 17. The apparatus of claim 16, wherein the means for joining the first and second base strips to the opposing first and second regions of the film, respectively, does not include a plate interposed between the first and second base strips.

18. a means for joining the first region and the second region to each other at joining regions at both ends of the zipper tape in the longitudinal direction, The means for forming the container body includes cutting the film along the joining area; 18. The manufacturing apparatus for a container with a zipper tape according to claim 15, wherein the means for forming the hinge includes a forming means arranged so as to straddle the joining region.

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