Zipper tape, bag with zipper tape and method of manufacturing same

Abstract

To provide a zipper tape, a bag body with a zipper tape, and a manufacturing method for the same, which can implement productivity improvement by reducing a time for welding with a film constituting the bag body and a time requiring for zipper crushing.SOLUTION: This zipper tape 3 includes a female pawl member 11 and a male pawl member 9 that are formed using low melting point synthetic resin for zippers containing 50 mass% or more of metallocene-based polypropylene having an MFR equal to or higher than 5.0 g / 10 minutes and a melting peak temperature equal to or lower than 130°C, which enables efficient zipper crushing.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a zipper tape for bags used mainly for packaging food, medicine, miscellaneous goods, etc., a bag with zipper tape, and a method for manufacturing the same. [Background technology]

[0002] 2. Description of the Related Art Conventionally, bags used in various applications such as food packaging, pharmaceutical packaging, and miscellaneous goods packaging have been widely provided with a zipper tape at the opening to enable opening and closing.

[0003] The zipper tape comprises a pair of base portions made of synthetic resin, a pair of female claw bodies integrally protruding from the surface of one of the base portions, and a male claw body integrally protruding from the other base portion and inserted between the female claw bodies, and the female claw bodies and the male claw bodies are adapted to be detachably engaged with each other.

[0004] This zipper tape is fixed to the inside of the opening of the bag by welding a sealing layer laminated on the back side (film side) of the base to the inside of the film that constitutes the bag.

[0005] In addition to sealing the bag body, this zipper tape is designed to integrate both ends of the zipper with the sealed portions of the bag body by pressing both ends at high temperature (hereinafter referred to as zipper crushing).

[0006] Meanwhile, in this type of zipper tape, a low-melting-point resin has been used in the sealing layer to shorten the welding time and improve productivity and appearance (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2003-212249 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the conventional technology as described above, when the film constituting the bag body is a laminate film using an aluminum film, if an attempt is made to press both ends of the zipper tape at a high temperature for a short period of time in the process of crushing the zipper, the aluminum film may be cracked by the pressure of the zipper tape, which may impair the sealing performance and appearance.

[0009] Therefore, with conventional zipper tapes, even if the time required for welding to the film was shortened by using a low-melting point resin for the sealing layer, there was a problem that it took time to crush the zipper, and thus productivity could not be improved.

[0010] In view of the above-mentioned problems, the present invention has been made with an object to provide a zipper tape, a bag body with a zipper tape, and a manufacturing method thereof, which can shorten the time required for welding to the film that constitutes the bag body and the time required for crushing the zipper, thereby improving productivity. [Means for solving the problem]

[0011] The feature of the invention described in claim 1 for solving the above-mentioned conventional problems is a zipper tape comprising a female claw member having a pair of female claw bodies protruding from the surface of a tape-shaped base portion, and a male claw member having a male claw body protruding from the surface of the tape-shaped base portion and inserted between the female claw bodies, the female claw member and the male claw member being formed from a low melting point synthetic resin for zippers containing 50 mass % or more of a metallocene-based polypropylene having an MFR of 5.0 g / 10 min or more and a melting peak temperature of 130° C. or less, The base part has a multi-layer structure in which a seal layer is laminated on the back side of the base part main body to be welded to the film, and the seal layer is formed of a synthetic resin for sealing having a resin composition different from that of the low-melting-point synthetic resin for the chuck, and the low-melting-point synthetic resin for the chuck and the synthetic resin for sealing contain a common resin having a melting point of less than 100°C in common with each other. The point is...

[0012] The invention described in claim 2 is characterized in that, in addition to the configuration of claim 1, the low melting point synthetic resin for a chuck contains 15 mass % or more of a metallocene-based propylene-α-olefin copolymer.

[0013] Claim 3The invention described in is characterized in that Claim 1 In addition to the above constitution, the common resin is a resin using a metallocene catalyst.

[0014] Claim 4 The invention described in is characterized in that Claims 1-3 In addition to any one of the configurations above, each of the female claw bodies has a hook support portion having an outwardly bulging mountain-shaped or arc-shaped cross section, and a hook portion extending inward from the tip of the hook support portion, and the apex of the mountain-shaped or arc-shaped cross section of the hook support portion is positioned closer to the tip than the middle of the overall height.

[0015] Claim 5 The invention described in is characterized in that Claims 1 to 4 The bag body is provided with any one of the zipper tapes.

[0016] Claim 6 The invention described in is characterized in that Claim 5 In addition to the above configuration, the film constituting the bag body is a laminate film having an aluminum film layer.

[0017] Claim 7 The invention described in the above is characterized in that a zipper tape comprising a female claw member having a pair of female claw bodies protruding from the surface of a tape-shaped base portion and a male claw member having a male claw body protruding from the surface of the tape-shaped base portion and inserted between the female claw bodies is disposed between a pair of films facing each other, the base portion is welded to the film, at least both side edges of the two films are pressed at a high temperature to weld them, and both ends of the zipper tape are crushed to be integrated with the film, in the method for manufacturing a bag body with a zipper tape, the female claw member and the male claw member are formed of a low melting point synthetic resin for zippers containing 50 mass % or more of a metallocene-based polypropylene having an MFR of 5.0 g / 10 min or more and a melting peak temperature of 130° C. or less, The base part has a multi-layer structure in which a seal layer is laminated on the back side of the base part main body to be welded to the film, and the seal layer is formed of a synthetic resin for sealing having a resin composition different from that of the low-melting-point synthetic resin for the chuck, and the low-melting-point synthetic resin for the chuck and the synthetic resin for sealing contain a common resin having a melting point of less than 100°C in common with each other. The point is...

[0018] Claim 8 The invention described in is characterized in that Claim 7In addition to the above constitution, the low melting point synthetic resin for a chuck contains 15 mass % or more of a metallocene-based propylene-α-olefin copolymer.

[0019] Claim 9 The invention described in is characterized in that Claim 7 In addition to the above constitution, the common resin is a resin using a metallocene catalyst.

[0020] Claim 10 The invention described in is characterized in that Claims 7 to 9 In addition to any one of the configurations above, each of the female claw bodies has a hook support portion having an outwardly bulging mountain-shaped or arc-shaped cross section, and a hook portion extending inward from the tip of the hook support portion, and the apex of the mountain-shaped or arc-shaped cross section of the hook support portion is positioned closer to the tip than the middle of the overall height. Effect of the Invention

[0021] By incorporating the features of claims 1 to 3, the zipper tape of the present invention can lower the zipper crushing temperature and shorten the zipper crushing time, and can also be used in cases where the zipper tape is to be welded to a laminate film that uses an aluminum film.

[0022] Furthermore, in the present invention, by providing the configuration of claim 4, the chuck can be crushed smoothly.

[0023] Furthermore, in the present invention, by providing the configurations of claims 5 and 6, the zipper tape can be appropriately attached to the bag body, and the appearance can be improved.

[0024] Furthermore, in the present invention, by providing the configurations of claims 7 to 10, the chuck crushing temperature can be lowered and the chuck crushing time can be shortened, making it possible to handle cases where a laminate film using an aluminum film is to be welded. [Brief description of the drawings]

[0025] [Figure 1] 1 is a front view showing a bag with a zipper tape according to the present invention. [Diagram 2] FIG. 2 is an enlarged cross-sectional view showing a zipper tape portion according to the present invention in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Next, an embodiment of the zipper tape according to the present invention and a bag body with zipper tape using the same will be described with reference to the examples shown in Figures 1 and 2. In the figures, reference numeral 1 denotes a bag body with zipper tape.

[0027] As shown in FIG. 1, the bag with zipper tape 1 comprises a bag-shaped bag body 2 with one opening and a zipper tape 3 attached to the opening of the bag body 2, and can be opened and closed by the zipper tape 3.

[0028] The bag body 2 includes a pair of films 4, 5 made of synthetic resin facing each other, and is formed into a bag shape by providing sealing portions 6 by heat welding on three sides of both the films 4, 5.

[0029] The films 4 and 5 are formed of a laminate film having an aluminum film.

[0030] The zipper tape 3 comprises a female claw member 9 having a pair of female claw bodies 8, 8 protruding from the surface of a tape-shaped base portion 7, and a male claw member 11 having a male claw body 10 protruding from the surface of the tape-shaped base portion 7 to be inserted between the female claw bodies 8, 8. The base portion 7 is welded to the inside of the films 4, 5 and fixed to the inside of the openings of both films 4, 5, and the male claw body 10 and the female claw body 8, 8 are adapted to be detachably engaged with each other.

[0031] The male claw member 11 and the female claw member 9 are integrally formed from a low melting point synthetic resin for chucks, and are capable of melting at a low temperature.

[0032] The zipper tape 3, i.e., the male claw member 11 and the female claw member 9, are formed to a length approximately equal to the width of the films 4, 5 that constitute the bag body 2, and both ends of the zipper tape 3 are pressed together with the sealing portion 6 of the bag body 2 at high pressure (hereinafter referred to as zipper crushing), causing them to melt and be crushed, and to be integrated with the sealing portion 6 of the films 4, 5.

[0033] The low-melting point synthetic resin for the chuck contains 50% by mass or more of metallocene-based polypropylene with an MFR of 5.0 g / 10 min or more and a peak melting temperature of 130°C or less, making it a low-melting point resin.

[0034] In addition, the low melting point synthetic resin for the chuck contains 15 mass % or more of a metallocene-based propylene-α-olefin copolymer, and also contains a common resin made of a resin using a metallocene catalyst having a melting point of less than 100°C.

[0035] The base portion 7 is formed in the shape of a thin tape and has a multilayer structure including a base portion main body 7a made of a low-melting point synthetic resin for the chuck and a sealing layer 7b made of a sealing synthetic resin having a different resin composition from the low-melting point synthetic resin for the chuck, which is laminated on the back side of the base portion main body 7a.

[0036] The synthetic resin for the seal has a resin composition with a lower melting point than the low melting point synthetic resin for the chuck, and contains a common resin made of a resin using a metallocene catalyst having a melting point of less than 100°C that is common to both the low melting point synthetic resin for the chuck and the low melting point synthetic resin for the chuck.

[0037] As shown in Figure 2, the male claw body 10 has a protruding male claw support portion 13 that protrudes from the surface of the base portion 7 and continues in the longitudinal direction of the base portion 7, and an arrowhead-shaped insertion hook portion 14 that is formed integrally with the tip of the male claw support portion 13, with the male claw support portion 13 and the insertion hook portion 14 being formed in an arrow-shaped cross section.

[0038] The base ends of both female claw bodies 8, 8 are supported by the base portion 7, and each has a hook support portion 15 that is continuous with the base portion 7 in the longitudinal direction, and hook portions 16 that extend inward from the tips of the hook support portions 15, respectively. The male claw body 10 is inserted between the hook portions 16, 16, and the hook portion 16 engages with the insertion hook portion 14.

[0039] Each hook support portion 15 has an outwardly bulging mountain-shaped or arc-shaped cross section, and the apex 15a of the mountain-shaped or arc-shaped cross section of the hook support portion 15 is positioned at the midpoint of the overall height or further towards the tip, and the cross section consisting of both hook support portions 15 is such that the point where the distance w between both hook support portions 15, 15 is greatest is positioned at the midpoint m of the overall height h or slightly further towards the tip.

[0040] Next, a method for manufacturing the bag 1 with the zipper tape will be described. Note that the same components as those in the above-mentioned embodiment are given the same reference numerals and the description thereof will be omitted.

[0041] The bag body 1 with zipper tape is manufactured through a process in which the zipper tape 3, consisting of engaging female claw members 9 and male claw members 11, is placed between a pair of opposing films 4, 5, and the base portion 7 is heated to weld the base portion 7 to the films 4, 5, and a process in which at least both side edges of the films 4, 5 are pressed at high temperature to weld the films 4, 5, and both ends of the zipper tape 3 are crushed to integrate them with the films 4, 5, thereby forming zipper crushed portions 17, 17 (zipper crushing process).

[0042] In this case, the base portion 7 has a multi-layer structure in which a sealing layer 7b that is welded to the films 4, 5 is laminated on the back side of the base portion main body 7a, and the sealing layer 7b is formed from a synthetic resin for sealing that has a resin composition different from that of the low-melting point synthetic resin for the zipper, so that the base portion 7 and the films 4, 5 can be welded together in a short period of time.

[0043] On the other hand, in the zipper crushing process, since the female claw members 9 and the male claw members 11 are formed from a low-melting point synthetic resin for zippers containing 50 mass % or more of metallocene-based polypropylene having an MFR of 5.0 g / 10 min or more and a peak melting temperature of 130° C. or less, when pressed at a high temperature, the end of the zipper tape 3 easily melts and is integrated with the films 4 and 5.

[0044] In addition, each hook support portion 15 has a mountain-shaped or arc-shaped cross section that bulges outward, and the top of the mountain-shaped or arc-shaped cross section of the hook support portion 15 is located at the midpoint of the overall height or slightly closer to the tip. The cross section consisting of both hook support portions 15 is designed so that the point where the distance between both hook support portions 15, 15 is greatest is located at the midpoint of the overall height or slightly closer to the tip, making it easy for the male claw body 10 to be inserted between the two female claw bodies 8, 8.

[0045] In addition, when pressed at high temperatures to crush the chuck, the low melting point synthetic resin used for the chuck melts easily. In addition, since the apex of the mountain-shaped cross section of the hook support part 15 is located at the middle of the overall height or slightly higher, the force acting in the overall height direction of the hook support part 15 due to pressing is dispersed horizontally, making the male claw body 10 and the female claw bodies 8, 8 easily crushed.

[0046] Therefore, the zipper crushing step can be performed at a low temperature in a short time. Even in the case of a laminate film having aluminum films 4 and 5, the zipper tape 3 is easily dissolved while being crushed, so that excessive pressure is not applied to the aluminum film, thereby preventing the films 4 and 5 from cracking.

[0047] In the above embodiment, the films 4 and 5 are laminate films including an aluminum film, but the films may be made of other synthetic resins. [Explanation of symbols]

[0048] 1 Bag with zipper tape 2 Bags 3 Zipper Tape 4,5 Film 6. Sealing 7 Base 8 Female nail body 9 Female jaw member 10 Male claw body 11 Male jaw member 13 Male claw support part 14 Insertion hook 15 Hook support part 16 Hook part 17 Chuck crushing part

Claims

1. A zipper tape comprising a female claw member having a pair of female claw bodies protruding from the surface of a tape-shaped base, and a male claw member having a male claw body protruding from the surface of the tape-shaped base and inserted between the female claw bodies, the female claw member and the male claw member are formed of a low melting point synthetic resin for a zipper containing 50% by mass or more of a metallocene-based polypropylene having an MFR of 5.0 g / 10 min or more and a melting peak temperature of 130° C. or less, The base portion has a multi-layer structure in which a seal layer is laminated on the back side of the base portion main body and is welded to a film, and the seal layer is formed of a sealing synthetic resin having a resin composition different from that of the low-melting point synthetic resin for the chuck, The zipper tape is characterized in that the low melting point synthetic resin for the zipper and the synthetic resin for the seal contain a common resin having a melting point of less than 100°C.

2. 2. The zipper tape according to claim 1, wherein the low melting point synthetic resin for a zipper contains 15 mass % or more of a metallocene-based propylene-α-olefin copolymer.

3. 2. The zipper tape according to claim 1, wherein the common resin is a resin using a metallocene catalyst.

4. The zipper tape according to any one of claims 1 to 3, wherein each of the female claw bodies comprises a hook support part having an outwardly bulging mountain-shaped or arc-shaped cross section, and a hook part extending inward from a tip of the hook support part, and an apex of the mountain-shaped or arc-shaped cross section of the hook support part is located closer to the tip side than the middle of the overall height.

5. A bag body with a zipper tape, comprising the zipper tape of any one of claims 1 to 4.

6. 6. The bag with zipper tape according to claim 5, wherein the film constituting the bag body is a laminate film having an aluminum film layer.

7. A method for manufacturing a bag with a zipper tape, comprising: disposing a zipper tape between a pair of films facing each other; the zipper tape has a female claw member with a pair of female claw bodies protruding from the surface of a tape-shaped base; and a male claw member with a male claw body protruding from the surface of the tape-shaped base, the male claw body being inserted between the female claw bodies; welding the base to the films; pressing at least both side edges of the films at a high temperature to weld them; and crushing both ends of the zipper tape to integrate it with the films, the female claw member and the male claw member are formed of a low melting point synthetic resin for a zipper containing 50% by mass or more of a metallocene-based polypropylene having an MFR of 5.0 g / 10 min or more and a melting peak temperature of 130° C. or less, the base portion has a multi-layer structure in which a seal layer is laminated on the back side of the base portion main body and is welded to the film, and the seal layer is formed of a sealing synthetic resin having a resin composition different from that of the low-melting point synthetic resin for the zipper, The method for manufacturing a bag body with a zipper tape is characterized in that the low melting point synthetic resin for the zipper and the synthetic resin for the seal contain a common resin having a melting point of less than 100°C.

8. 8. The method for producing a bag with a zipper tape according to claim 7, wherein the low melting point synthetic resin for the zipper contains 15 mass % or more of a metallocene-based propylene-α-olefin copolymer.

9. 8. The method for producing a bag with a zipper tape according to claim 7, wherein the common resin is a resin using a metallocene catalyst.

10. The method for manufacturing a bag body with a zipper tape according to any one of claims 7 to 9, wherein each of the female claw bodies has a hook support part having a mountain-shaped or arc-shaped cross section that bulges outward, and a hook part that extends inward from the tip of the hook support part, and the apex of the mountain-shaped or arc-shaped cross section of the hook support part is located on the tip side from the middle of the overall height.

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