JP2020045106A - Zipper bag - Google Patents

Abstract

To provide a zipper bag capable of suppressing sorption (adsorption and absorption) of a content, without using a hydrophilic EVOH resin in a sealant layer forming a packaging bag.SOLUTION: A zipper bag has a packaging bag formed of a film 11 having a sealant layer 20 on an inner face, and a zipper 13 bonded to the inner face of the film 11 via the sealant layer 20. The zipper 13 is made of an olefin resin, the sealant layer 20 is made of the olefin resin, and the sealant layer 20 has at least one layer containing a cyclic olefin resin.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a chuck bag in which a chuck is bonded to an inner surface of a film.

  2. Description of the Related Art Conventionally, in a packaging bag for packaging foodstuffs, cosmetics, medicines, medical supplies, and the like, a chuck (zipper) that can reseal the packaging bag is provided for the purpose of temporarily storing contents after opening. Sometimes. Patent Document 1 discloses a packaging bag capable of achieving both the heat welding property of a polyethylene chuck and the low adsorptivity of content components, in which at least one sealant layer used for heat welding is made of ethylene-vinyl alcohol copolymer. It is described to include a coalescence (EVOH) layer.

JP 2010-280403 A

  In Patent Literature 1, when the sealant layer forming the packaging bag is made of a polyethylene resin, a highly volatile component in the contents is sorbed (adsorbed or absorbed) to the sealant layer. It is shown that the layer consists of a laminated packaging bag containing an EVOH layer. However, including an EVOH layer in the sealant layer is not an effective solution for all volatile components. In addition, when the moisture content of the contents is high, it is difficult to use EVOH as a material for packaging bags because EVOH is hydrophilic. From the above points, a chuck bag using a material other than EVOH has been demanded.

  The present invention has been made in view of the above circumstances, and can suppress sorption (adsorption, absorption) of contents without using a hydrophilic EVOH resin for a sealant layer forming a packaging bag. It is an object to provide a chuck bag.

  In order to solve the above problems, the present invention is a zipper bag having a packaging bag made of a film having a sealant layer on the inner surface thereof, and a chuck joined to the inner surface of the film via the sealant layer, The chuck bag is provided, wherein the chuck is made of an olefin resin, the sealant layer is made of an olefin resin, and the sealant layer has at least one layer containing a cyclic olefin resin.

The sealant layer may have a layer containing a cycloolefin copolymer as an innermost layer as a layer containing the cyclic olefin-based resin.
The sealant layer may have a polyethylene layer as an innermost layer.

  According to the present invention, sorption (adsorption, absorption) of contents can be suppressed by using a layer containing a cyclic olefin-based resin as the sealant layer constituting the packaging bag.

It is a figure showing an example of a zipper bag of the present invention. FIG. 2 is a partially enlarged sectional view taken along line II-II of FIG. 1.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

  FIG. 1 shows an example of the chuck bag. The chuck bag 10 according to the present embodiment includes a packaging bag configured by providing a seal portion 12 around a film 11 having a sealant layer on the inner surface, and a chuck bonded to the inner surface of the film 11 via the sealant layer of the film 11. 13. The chuck 13 is arranged so as to cross the packaging bag. The chuck 13 may be arranged near a cutting line 14 that is intended to be an opening.

  Before the cutting line 14 is cut, the chuck 13 is surrounded by the seal portion 12, so that the chuck 13 does not have a possibility of touching outside air or foreign matter. When the cutting line 14 is cut and the chuck 13 is opened, the contents stored in the packaging bag can be taken out. Thereafter, when the chuck 13 is closed, the packaging bag can be sealed again. The cutting line 14 may be a half-cut line that does not penetrate the film 11, or may be a perforation having intermittent cuts that penetrate the film 11. By providing an easy opening line such as a half cut line or a perforation, opening along the cutting line 14 becomes easy. The cutting line 14 does not have an easy-opening line, and may be provided by printing or the like on the film 11 as a display as a guide when using a blade such as scissors. Further, the cutting line 14 does not need to have a special easy-open structure and display. A tear initiation means such as a notch may be provided at one or both ends of the cutting line 14 to facilitate the start of opening.

  As shown in FIG. 2, the film 11 constituting the packaging bag has the film 11 facing with the chuck 13 inside. These films 11 may be formed by stacking different films or by folding the same film. The chuck 13 includes a first piece 31 having a concave portion 13a and a second piece 32 having a convex portion 13b. The first piece 31 and the second piece 32 are joined to another film 11 facing each other. By fitting the convex portion 13b into the concave portion 13a, the first piece 31 and the second piece 32 are connected, and the chuck 13 is closed.

  The shape of the concave portion 13a and the convex portion 13b is not particularly limited, and any configuration can be adopted. For example, the concave portion 13a may be a continuous groove along the cutting line 14. Further, the protruding portion 13b may be a protruding ridge that is continuous along the cutting line 14. The first piece 31 has a convex part and a concave part alternately, and the second piece 32 has a concave part at a position facing the convex part of the first part 31 and a convex part at a position facing the concave part of the first part 31. It may have a part.

  The first piece 31 and the second piece 32 include a strip-shaped film piece at a position where the first piece 31 and the second piece 32 are joined to the film 11 constituting the packaging bag. These film pieces may be formed integrally with the concave portions 13a and the convex portions 13b. The resin constituting the chuck 13 is preferably an olefin resin. Further, it is preferable that the sealant layer 20 of the film 11 to which the first piece 31 and the second piece 32 are joined is also made of an olefin resin.

  The olefin resin is a resin obtained by polymerizing at least one kind of acyclic olefin or cyclic olefin. Examples of the acyclic olefin include α-olefins such as ethylene, propylene, 1-butene, 1-hexene, and 1-octene. Examples of the cyclic olefin include norbornene-based monomers such as norbornene. The norbornene-based monomer is a cyclic olefin having a norbornene skeleton. The polymer containing the norbornene-based monomer may be an addition polymer that maintains the norbornene skeleton, or a ring-opened polymer in which the norbornene skeleton opens.

  The olefin-based resin may include a monomer other than the olefin. Monomers other than olefins include acrylic monomers such as methyl acrylate, unsaturated carboxylic acid monomers such as maleic acid, unsaturated acid anhydride monomers such as maleic anhydride, and vinyl monomers such as vinyl acetate and vinyl chloride. Is mentioned.

  Examples of the olefin resin constituting the chuck 13 include a linear low-density polyethylene and an ethylene-methyl acrylate copolymer resin. The resin forming the first piece 31 and the resin forming the second piece 32 of the chuck 13 may be the same or different. Since the chuck 13 is made of the above-mentioned olefin-based resin, the sealing strength when thermocompression-bonded to the sealant layer 20 is sufficiently high. Further, there is no problem in the resealability required for the chuck bag.

  The sealant layer 20 may have two or more layers made of an olefin-based resin. FIG. 2 shows an example in which the sealant layer 20 has three layers of an innermost layer 21, an intermediate layer 22, and an outer layer 23. When the sealant layer 20 is composed of three layers, for example, the innermost layer 21 and the outer layer 23 may be composed of a polyethylene resin, and the intermediate layer 22 may be a layer containing a cyclic olefin resin.

  Examples of the polyethylene-based resin include polyethylene such as high-density polyethylene (HDPE) and low-density polyethylene (LDPE), and polyolefin-based resins mainly containing ethylene such as linear low-density polyethylene (LLDPE). Specific examples of the polyolefin resin mainly composed of ethylene include C4-LLDPE obtained by copolymerizing butene, C6-LLDPE obtained by copolymerizing hexene, and C8-LLDPE obtained by copolymerizing octene. The catalyst and the like at the time of polymerization are not particularly limited.

  The polyethylene resin used for the innermost layer 21 and the polyethylene resin used for the outer layer 23 may be the same or different. Further, one or both of the innermost layer 21 and the outer layer 23 may be used by blending two or more kinds of polyethylene resins. The ethylene content of the polyethylene resin is, for example, about 50% by mass or more, about 80% by mass, about 90% by mass, about 95% by mass, about 99% by mass, or about 100% by mass.

  The cyclic olefin-based resin is a resin having a configuration containing a cyclic olefin as a monomer among olefin-based resins. Examples include a homopolymer of one kind of cyclic olefin, a copolymer of two or more kinds of cyclic olefins, and a copolymer of a cyclic olefin and a non-cyclic olefin. Among the cyclic olefin resins, a cycloolefin polymer (COP) composed of a polymer of a cyclic olefin having a norbornene skeleton or a hydrogenated product thereof, and a cycloolefin copolymer (COC) composed of a copolymer of a cycloolefin and a noncyclic olefin such as ethylene. Is preferred.

  Commercial products can be used as the cycloolefin polymer. For example, ZEONEX / ZEONEX (registered trademark) and ZEONOR / ZEONOR (registered trademark) manufactured by Zeon Corporation can be suitably used. Commercial products can also be used as the cycloolefin copolymer. For example, Apel / APEL (registered trademark) manufactured by Mitsui Chemicals, Inc. and Topas / TOPAS (registered trademark) manufactured by Polyplastics Co., Ltd. can be suitably used.

  When the sealant layer 20 has a layer containing a cyclic olefin-based resin, volatile components and components having high adsorptivity contained in the contents are less likely to be sorbed (adsorbed and absorbed) to the sealant layer 20. When the total thickness of the sealant layer 20 is 100%, the thickness of the layer containing the cyclic olefin-based resin is 100% or less, for example, 10%, 20%, 30%, 40%, 50%, 60% , 70%, 80%, 90%, and 100%.

  The sealant layer 20 may have a layer containing a cycloolefin copolymer as the innermost layer 21 as a layer containing a cyclic olefin-based resin. When the sealant layer 20 has a layer containing a cyclic olefin-based resin as the intermediate layer 22, it may have a polyethylene layer as the innermost layer 21. The polyethylene layer is a layer in which the resin component contains at least one kind of polyethylene resin in an amount of 50% by weight or more. The polyethylene component may occupy 100% by weight of the resin component of the polyethylene layer, or the total of two or more polyethylene resins may be 50% by weight or more.

  When the innermost layer 21 is a polyethylene layer, the thickness of the polyethylene layer of the innermost layer 21 when the total thickness of the sealant layer 20 is 100% is less than 100%, for example, 10%, 20%, 30%. %, 40%, 50%, 60%, 70%, 80%, 90%. In addition, the thickness of the polyethylene layer of the innermost layer 21 is, for example, 5 to 30 μm and 10 to 25 μm.

  The innermost layer 21, the intermediate layer 22, and the outer layer 23 may be in close contact with each other by coextrusion or the like without intervening other materials. The resin constituting each layer of the sealant layer 20 may be added with an appropriate additive as long as the object of the invention is not impaired. Examples of the additive include an antioxidant, a lubricant, an antiblocking agent, a flame retardant, an ultraviolet absorber, a light stabilizer, an antistatic agent, and a coloring agent.

  The sealant layer 20 can be used for sealing (joining) between the sealant layers 20. The sealing method is not particularly limited, and examples thereof include a hot plate seal, an ultrasonic seal, a high frequency seal, and an impulse seal. The sealant layer 20 can be heat-sealed with the innermost layers 21 facing each other without any other adhesive or the like therebetween. The thickness of the sealant layer 20 is preferably selected from the viewpoints of workability, flexibility, non-sorption properties, and the like, and is not particularly limited, but is preferably, for example, 20 to 200 μm.

  The film 11 constituting the packaging bag has a base material layer 25 laminated on the outer layer 23 side of the sealant layer 20. Another layer may be laminated between the sealant layer 20 and the base material layer 25 or on the side of the base material layer 25 opposite to the sealant layer 20. For example, an adhesive layer 24 may be provided between the sealant layer 20 and the base material layer 25. The base material layer 25 can include a resin film or a different material other than a resin. Examples of the dissimilar material include metal foil such as aluminum and paper. An adhesive, an anchoring agent, or the like may be used for bonding the base layers.

  As the substrate layer, a stretched film excellent in mechanical properties such as heat resistance and strength and printability is preferable, and specifically, a stretched polyester resin film such as a biaxially stretched polyethylene terephthalate (O-PET) film, Examples include stretched polyamide resin films such as an axially stretched nylon (O-Ny) film and stretched polyolefin resin films such as a biaxially stretched polypropylene (OPP) film. The thickness of the substrate layer is usually 10 to 50 μm, preferably 10 to 30 μm. The base layer may be composed of two or more layers. The base material layer preferably contains a water vapor barrier resin or a gas barrier resin in order to prevent moisture and gas from entering. Examples of the water vapor barrier resin include polyolefin resins such as polyethylene and polypropylene. Examples of the gas barrier resin include polyamide resins such as nylon, and ethylene-vinyl alcohol copolymer (EVOH).

  The form of the packaging bag is not particularly limited, and examples thereof include a flat bag, a gusset bag, and a standing pouch. The contents of the zipper bag are not particularly limited, but can be suitably used for packaging of contents containing fragrances and active ingredients, such as foods and drinks, cosmetics, and medicines. The zipper bag according to the present embodiment can be opened to a large extent when the zipper is opened, so that it is also suitable for packaging contents that are difficult to reseal with a spout with a cap and difficult to pour out by flowing. Further, in the sealant layer, sorption of components contained in the content is reduced, so that the sealant layer is suitable for packaging of a content containing a component that is easily sorbed, for example, a low molecular weight organic component. For example, there are contents in which a liquid or a viscous substance is absorbed or adhered to a solid substance, and contents in which a solid substance is immersed in a liquid or viscous substance. Specific examples include products containing active ingredients such as pharmaceuticals, fragrances, alcohols, oils, etc., pharmaceuticals such as disinfecting pads, compresses, transdermal preparations, cosmetics such as beauty masks, fruits, raw confectionery, pickles, etc. Foods and the like.

  As described above, the present invention has been described based on the preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

  Hereinafter, the present invention will be described specifically with reference to Examples.

Example 1
A sealant layer composed of a 15 μm-thick polyethylene layer (outer layer) and a 30 μm-thick cycloolefin copolymer layer (innermost layer) was formed. An outer polyethylene layer was laminated with a base layer made of a polyester resin having a thickness of 12 μm via a polyurethane-based adhesive to obtain a laminated film. A chuck made of LLDPE was joined to the inner surface of the laminated film to produce a chuck bag.

Example 2
A sealant layer composed of a 15 μm-thick polyethylene layer (outer layer), a 30 μm-thick cycloolefin copolymer layer (intermediate layer), and a 15 μm-thick polyethylene layer (innermost layer) was formed. An outer polyethylene layer was laminated with a base layer made of a polyester resin having a thickness of 12 μm via a polyurethane-based adhesive to obtain a laminated film. A chuck made of LLDPE was joined to the inner surface of the laminated film to produce a chuck bag.

Comparative Example 1
A sealant layer composed of a polyethylene layer (outer layer) having a thickness of 15 μm and a polyethylene layer (innermost layer) having a thickness of 30 μm was formed. An outer polyethylene layer was laminated with a base layer made of a polyester resin having a thickness of 12 μm via a polyurethane-based adhesive to obtain a laminated film. A chuck made of LLDPE was joined to the inner surface of the laminated film to produce a chuck bag.

Seal strength The seal strength between the chuck and the sealant layer is determined by heat-sealing a 15 mm wide sample by the same method as JIS Z0238 (testing method for heat-sealed flexible packaging bags and semi-rigid containers), and chucking at a speed of 300 mm / min. And the load (N) when the sealant layer was pulled up and down, and the seal strength (N / 15 mm) was determined.

Chuck performance (sensory test)
After holding the zipper bag with both hands and opening the zipper, a series of operations for resealing while holding the zipper by hand was repeated 50 times, and the easiness of opening and closing the zipper was evaluated on a scale of 5 out of 5. At the time of evaluation, the age (25 to 65 years old) and gender were randomly assigned, and the average value was obtained with 30 panelists.

Non-Sorptive Property of Contents The components to be added to the contents were three kinds of tocopherol acetate, menthol, and camphor, and the sorption amount was determined for each component in the following procedure.
The procedure for measuring the amount of sorption is as follows. A zipper bag was manufactured in the form of a three-sided bag having an opening on a side different from that of the chuck, with a length and width of 90 mm × 90 mm and a seal width of 10 mm. 2 g of one component selected from the above was dissolved in 150 g of a 1: 1 mixed solvent of ethanol and water to prepare a content solution. 10 mL of the content liquid was weighed, filled into the bag through the opening of the chuck bag, and the opening was heat-sealed. The chuck bag filled with the content liquid was stored at 40 ° C. for 4 weeks. After that, the zipper bag is opened, the content liquid is taken out of the zipper bag, the contact surface of the film constituting the zipper bag, which is in contact with the content liquid, is lightly wiped and cut, and the components sorbed on the film piece having a predetermined area are removed. Extraction was performed with 5 mL of an extraction solvent. A quantitative amount was collected from the extract using a syringe, injected into a gas chromatography, and a quantitative value of the component concentration was obtained. Then, the sorbed amount per 100 cm ^{2 of} surface area where the film was in contact with the content liquid was calculated.

As shown in Table 1, Examples 1 and 2 had sealing strength and chuck performance comparable to Comparative Example 1. In Examples 1 and 2, the sorption amount of any component was less than 3 mg / 100 cm ² , whereas in Comparative Example 1, the sorption amount exceeded 3 mg / 100 cm ² . In particular, the sorption amount of tocopherol acetate was more than 10 mg / 100 cm ² in Comparative Example 1. Accordingly, it was confirmed that the chuck bags of Examples 1 and 2 had non-sorbing properties of the components contained in the contents.

DESCRIPTION OF SYMBOLS 10 ... Chuck bag, 11 ... Film, 12 ... Seal part, 13 ... Chuck, 13a ... Concave part, 13b ... Convex part, 14 ... Cutting line, 20 ... Sealant layer, 21 ... Innermost layer, 22 ... Intermediate layer, 23 ... Outer layer , 24 ... adhesive layer, 25 ... base material layer, 31 ... first piece, 32 ... second piece.

Claims (3)

A packaging bag composed of a film having a sealant layer on the inner surface, and a chuck bag having a chuck joined to the inner surface of the film via the sealant layer,
A chuck bag, wherein the chuck is made of an olefin resin, the sealant layer is made of an olefin resin, and the sealant layer has at least one layer containing a cyclic olefin resin.   The chuck bag according to claim 1, wherein the sealant layer has a layer containing a cycloolefin copolymer as an innermost layer as a layer containing the cyclic olefin-based resin.   The zipper bag according to claim 1, wherein the sealant layer has a polyethylene layer as an innermost layer.

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