Packaging bag with zipper

Abstract

To provide a packaging bag having an opening that is maintained in a state of being widely opened in a direction perpendicular to a longitudinal direction when viewed from above, and in particular, to provide a packaging bag with a zipper having an opening that is widely opened in a direction perpendicular to an extending direction of the zipper when viewed from above and maintained in that state.SOLUTION: The above problem is solved by providing at least one pair of longitudinal mountain fold lines on the front and back surfaces of a packaging bag body of a packaging bag with a zipper.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging bag with a zipper that can greatly expand and maintain the opening. [Background technology]

[0002] BACKGROUND ART Packaging bags made of plastic films have been used for a variety of purposes. In particular, zippered packaging bags have been used for a variety of purposes since they are inexpensive and easy to open and seal. For example, Patent Document 1 discloses a packaging bag with a zipper, in which a non-engaging portion is provided in part of the zipper, thereby enabling the opening to maintain an octagonal shape. Furthermore, Patent Document 2 discloses a packaging bag (pouch) with a zipper, which has a low fitting strength portion in the zipper (fastener) to reduce the volume of the sound generated when the bag is opened. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6565150 specification [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-067160 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the openings of conventional packaging bags, regardless of whether they have a zipper or not, are difficult to maintain open in a direction perpendicular to the longitudinal direction when viewed from above (they return to their original state when the user lets go), posing issues with operability when putting in or taking out contents. In particular, the opening of conventional zippered packaging bags had the problem that it was difficult to open in a direction perpendicular to the direction in which the zipper extended when viewed from above, and it was also difficult to maintain the open state, due to the zipper's greater rigidity than the packaging bag itself.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a packaging bag whose opening is maintained in a state where it is widely open in a direction perpendicular to the longitudinal direction when viewed from above. In particular, an object of the present invention is to provide a packaging bag with a zipper that opens widely in a direction perpendicular to the direction in which the zipper extends when viewed from above and remains in that state. [Means for solving the problem]

[0006] As a result of intensive research into solving the above-mentioned problems, the inventors of the present invention succeeded for the first time in creating at least one set of vertical mountain fold lines on the front and back of the packaging bag body of a zippered packaging bag, which allows the bag to open wide in a direction perpendicular to the direction in which the zipper extends when viewed from above, and to maintain that state, thereby completing the present invention.

[0007] The main configuration of the present invention is as follows. [1] A zipper is provided at the opening of the packaging bag body to releasably seal the opening, At least one pair of vertical mountain fold lines is provided on the front and back of the packaging bag body, and the mountain fold lines are: i) having a length from the upper end of the packaging bag body to at least the lower end of the zipper; or ii) having a length of at least 50% of the length of the packaging bag body from the lower end of the packaging bag body; Packaging bag with zipper. [2] The packaging bag with a zipper according to [1], having at least one low fitting portion on the zipper. [3] The contents are contained in the internal space of the packaging bag body, The opening is sealed, [1] or [2]. The zippered packaging bag according to [1] or [2]. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a packaging bag with a zipper, the opening of which opens widely in a direction perpendicular to the direction in which the zipper extends when viewed from above, and which is maintained in that state. [Brief explanation of the drawings]

[0009] [Figure 1] Fig. 1(a) is a front view of one embodiment of the resealable packaging bag of the present invention. In Fig. 1(a), BL indicates the boundary line between the internal space of the packaging bag body and the bottom gusset. The hatching shown in Fig. 1(a) indicates the seal portion. Fig. 1(b) is a schematic diagram of the opening of one embodiment of the resealable packaging bag of the present invention when viewed from above in an opened state. [Figure 2] FIG. 2 is a conceptual diagram of the zipper of the zippered packaging bag of the present invention. [Figure 3-1] Figure 3-1 is a front view of the appearance of the pouches of Examples 1 to 3. Note that each figure is intended to show the appearance of the pouches in a schematic manner, and the scale and aspect ratios are not necessarily consistent (the same applies to Figures 3-2 to 5-3). [Figure 3-2] FIG. 3-2 is a front view of the appearance of the pouches of Example 4, Comparative Example 1, and Example 5. [Figure 3-3] FIG. 3-3 is a front view of the appearance of the pouches of Examples 6 and 7 and Comparative Example 2. [Figure 3-4] FIG. 3-4 is a front view of the appearance of the pouches of Examples 8 to 10. [Figure 3-5] FIG. 3-5 is a front view of the appearance of the pouches of Examples 11 and 12. [Figure 3-6] 3-6 are external front views of the pouches of Examples 13 and 14. FIG. [Figure 4-1] FIG. 4-1 is a front view of the appearance of the pouches of Examples 22 to 24. [Figure 4-2]FIG. 4-2 is a front view of the appearance of the pouches of Examples 25 to 27. [Figure 5-1] FIG. 5-1 is a front view of the appearance of the pouches of Reference Examples 6 to 8. FIG. [Figure 5-2] FIG. 5-2 is a front view of the appearance of the pouches of Reference Examples 9 to 11. [Figure 5-3] FIG. 5-3 is a front view of the appearance of the pouch of Reference Example 12. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0011] A packaging bag with a zipper according to the present invention (hereinafter also simply referred to as the “packaging bag of the present invention”) 1 has a zipper 4 at an opening 3 of a packaging bag body 2 that can open and close the opening 3. In this specification, various materials are used for the packaging bag body 2 depending on the application, and examples thereof include polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and nylon (NY). The packaging bag body 2 may have a single layer structure using only one of the above materials, or may have a multi-layer structure in which several of the above materials are laminated. Furthermore, the packaging bag body 2 may be transparent or opaque, and may be printed.

[0012] The zipper 4 in the packaging bag 1 of the present invention seals the opening 3 of the packaging bag body 2 in an openable manner by fitting together a male member and a female member having the same width dimension. The material of the male and female members of the zipper 4 is not particularly limited, and may be made of a plastic material that can be fused to the packaging bag body 2, for example. From the viewpoint of ease of use, the center of the zipper 4 is located at a position 3% to 40% of the length L of the packaging bag main body 2 from the upper end of the packaging bag main body 2 .

[0013] In the packaging bag 1 of the present invention, at least one pair of vertical mountain fold lines ML is provided on the front and back surfaces of the packaging bag body 2. The mountain fold line ML has a length from the upper end of the packaging bag body 2 to at least the lower end of the zipper 4; or ii) It has a length of at least 50% of the length of the packaging bag body 2 from the lower end of the packaging bag body 2. In case i), the mountain fold line ML preferably has a length from the upper end of the packaging bag body 2 that is 50% or more of the length L of the packaging bag body 2, and more preferably has a length of 80% or more of the length L of the packaging bag body 2. In the case of ii), the mountain fold line ML preferably has a length that extends from the lower end of the packaging bag body 2 to the lower end of the zipper 4, and more preferably has a length that extends to the upper end of the zipper 4. When a pair of mountain fold lines ML is provided, they are preferably provided at the center of the front and back surfaces of the packaging bag body 2. The mountain fold lines ML are formed at a predetermined pressure (for example, 0.05 MPa to 0.15 MPa), for a predetermined time (for example, 0.2 seconds to 1 second), and at a predetermined temperature (for example, 125° C.). Two or more sets of mountain fold lines ML (for example, two or three sets) may be provided on the front and back surfaces of the packaging bag body 2. Furthermore, apart from the vertical mountain fold lines ML, oblique mountain fold lines ML may be provided, and vertical valley fold lines VL may be provided.

[0014] The packaging bag 1 of the present invention preferably has at least one low fitting portion 5 on the zipper 4 . The low fitting portion 5 may be formed by crushing a portion of one or both of the male and female members of the chuck 4 at a predetermined pressure (e.g., 0.45 MPa, etc.), for a predetermined time (e.g., 4 seconds, etc.), and at a predetermined temperature (e.g., 135°C, etc.) (see FIG. 2), or may be designed by omitting a portion of one or both of the male and female members of the chuck 4 at the design stage (not shown). The width of the low fitting portion 5 is, for example, 6% to 16% of the length of the zipper 4. The number of low fitting portions 5 may be two or more (for example, two, three, etc.). The location where the low fitting portion 5 is arranged may be the center of the chuck 4 or an end of the chuck 4, with the end of the chuck 4 being preferred. In FIG. 1(a), a total of three low fitting portions 5 are provided in the center and both ends of the chuck 4.

[0015] In the packaging bag 1 of the present invention, the contents may be accommodated in the internal space of the packaging bag body 2, and the opening 3 may be sealed. The contents include food, liquid seasonings, etc. For example, if the contents are liquid seasoning, it is envisioned that opening 3 is left open, and ingredients selected by the user, such as meat or vegetables, are placed into the internal space, after which opening 3 is resealed and the contents are heated in a microwave oven.

[0016] The packaging bag 1 of the present invention may have a zipper tape attached to the surface of the packaging bag body 2, and the zipper tape may be provided with an easily peelable tape portion 6 as shown in Figure 1(a). Since the easily peelable tape portion 6 is located on the internal space side of the packaging bag main body 2 relative to the zipper 4, when contents are contained in the packaging bag 1 of the present invention, liquid-tightness is ensured by heat sealing the easily peelable tape portion 6 to the back surface of the packaging bag main body 2, thereby reducing the risk of the contents adhering to the zipper 4. The packaging bag 1 of the present invention may also be in the form of a standing pouch having a bottom gusset 7 as shown in FIG. 1(a). Furthermore, the packaging bag 1 of the present invention may be provided with a protrusion that protrudes outward in the width direction from either the left or right side portion of the packaging bag body 2, and the protrusion may be formed to include a second opening different from the opening 3. The second opening is used, for example, to put contents into the internal space of the packaging bag body 2 using a nozzle or the like, and is sealed after the contents have been put in.

[0017] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples. [Example]

[0018] [Zipper-type packaging bag] The specifications common to the checked packaging bags used in the following Experimental Examples 1 and 2, Reference Examples, Examples, and Comparative Examples, are as follows: Zippered packaging bag type - Stand-up pouch -Material and structure of the packaging bag body - From the surface, it has a three-layer structure of transparent vapor-deposited polyethylene terephthalate (PET) 12μm, biaxially oriented nylon (ONY) 15μm, and unstretched polypropylene (CPP) 60μm Material of the male and female parts of the chuck: Polypropylene (PP) -Packaging bag length: 170mm Gusset width of the packaging bag body: 34mm Zipper placement - The center is 11.8% of the length of the bag body from the top of the bag Mountain fold temperature: -125℃

[0019] [Experimental Example 1] Effect of mountain folds and zipper folds

[0020] [Evaluation items] When the opening of a standing pouch containing 75 ml of water was viewed from above, the length of the opening (vertical width; VW in Figure 1(b)) perpendicular to the direction in which the zipper extended 10 minutes after opening was measured, and measurements greater than the measurement value of the reference example were deemed to be effective (Example). The external front views of the pouches of Examples 1 to 14 and Comparative Examples 1 and 2 are shown in FIGS. 3-1 to 3-6, and the specifications and results of the pouches of Reference Examples 1 to 3, Examples 1 to 20, and Comparative Examples 1 and 2 are shown in Table 1.

[0021] [Table 1]

[0022] [result] (length of mountain fold line) The longer the mountain fold line, the greater the vertical width of the opening of the pouch, and the greater the effect of the zipper, as it also had a crease (Examples 1 to 9 and Comparative Examples 1 and 2). (Number of mountain folds) Even when two or more sets of mountain fold lines extending to the zipper were provided, the vertical width of the opening of the pouch did not increase (Examples 1 and 10 to 14). (Width of the packaging bag body) The larger the width of the packaging bag body (W in FIG. 1(a)), the larger the vertical width of the opening of the pouch (Examples 1, 15 and 16). (Mountain fold line application time) There was a tendency for the vertical width of the pouch opening to increase with increasing time, but the vertical width of the pouch opening was similar at 0.7 seconds and 1 second (Examples 1, 17 and 18). (Applied pressure on mountain fold line) No significant difference in the vertical width of the pouch opening was observed due to the difference in applied pressure (Examples 1, 19 and 20).

[0023] [Experimental Example 2] Effect of adding low fitting part

[0024] [Evaluation items] When the opening of a 181 mm wide standing pouch containing 69 ml of water was viewed from above, the length of the opening (vertical width; VW in Figure 1(b)) perpendicular to the direction in which the zipper extended was measured 10 minutes after opening, and measurements greater than the measurement value of the reference example were deemed to be effective (Example). The low fitting temperature was 135°C, the low fitting pressure was 0.45 MPa, the low fitting time was 4 seconds, and the thickness of the low fitting was 88% of that of a normal zipper. The external front views of the pouches of Examples 22 to 27 are shown in FIGS. 4-1 and 4-2, and the specifications and results of the pouches of Reference Example 4 and Examples 21 to 27 are shown in Table 2.

[0025] [Table 2]

[0026] [result] (Width of low mating part) No clear relationship was observed between the width of the low fitting portion and the vertical width of the opening of the pouch (Examples 22 to 24). (Number and arrangement of low-fitting parts) Regardless of the number of low fitting portions, when low fitting portions were provided at the end of the zipper, the vertical width of the opening of the pouch increased (Examples 25 to 27).

[0027] [Zipperless packaging bag] The zipperless packaging bags used in the following Experimental Examples 3 and 4 were in the form of standing pouches, and other specifications for each Experimental Example are shown below.

[0028] [Experimental Example 3] Effect of mountain folds

[0029] [specification] - Material and structure of the packaging bag body - From the surface, it has a four-layer structure of polyethylene terephthalate (PET) 12 μm, biaxially oriented nylon (ONY) 15 μm, aluminum 7 μm, and unstretched polypropylene (CPP) 60 μm. Mountain fold temperature: -130℃

[0030] [Evaluation items] When the opening of a standing pouch (width: 120 mm; length: 180 mm; gusset width: 33 mm) filled with water up to the half-length position is viewed from above, the length of the opening perpendicular to the longitudinal direction (vertical; unit: mm), the length of the opening in the longitudinal direction (horizontal; unit: mm), and the area of ​​the opening (unit: mm) were measured 10 minutes after opening. 2 ) was measured. The front views of the appearance of the pouches of Reference Examples 6 to 12 are shown in FIGS. 5-1 to 5-3, and the specifications and results of the pouches of Reference Examples 5 to 12 are shown in Table 3.

[0031] [Table 3]

[0032] [result] In the zipperless packaging bag of this experimental example, the mountain fold lines did not have any effect.

[0033] [Experimental Example 4] Effect of increasing width

[0034] [specification] -Material and structure of the packaging bag body - From the surface, it has a three-layer structure of transparent vapor-deposited polyethylene terephthalate (PET) 12μm, biaxially oriented nylon (ONY) 15μm, and unstretched polypropylene (CPP) 60μm Mountain fold temperature: -125℃

[0035] [Evaluation items] When the opening of a standing pouch containing water up to half its length was viewed from above, the length of the opening perpendicular to the longitudinal direction (vertical; unit: mm) and the length of the opening in the longitudinal direction (horizontal; unit: mm) were measured 10 minutes after opening. The specifications and results of the pouches of Reference Examples 13 to 16 are shown in Table 4.

[0036] [Table 4]

[0037] [result] Even in the zipperless packaging bag of this experimental example, the effect of the mountain fold lines was not obtained. Therefore, it was suggested that the effect of the mountain fold line does not change depending on the size (width) of the packaging bag, but does change depending on whether or not there is a zipper. [Industrial Applicability]

[0038] According to the present invention, it is possible to provide a packaging bag with a zipper, the opening of which opens widely in a direction perpendicular to the direction in which the zipper extends when viewed from above, and which remains in that state.

Claims

1. A zipper is provided at the opening of the packaging bag body to releasably seal the opening, At least one pair of vertical mountain fold lines is provided on the front and back of the packaging bag body, and the mountain fold lines are: i) having a length extending from the upper end of the packaging bag body to at least the lower end of the zipper; or ii) having a length of at least 50% of the length of the packaging bag body from the lower end of the packaging bag body; Packaging bag with zipper.

2. The packaging bag with a zipper according to claim 1, wherein the zipper has at least one low fitting portion.

3. The contents are contained in the internal space of the packaging bag body, The opening is sealed, The packaging bag with a zipper according to claim 1 or 2.

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