JP3594687B2 - Packaging bag with zipper and method of manufacturing packaging bag with zipper - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a packaging bag with a zipper used for packaging foods, pharmaceuticals, industrial products, and the like, and a method for manufacturing a packaging bag with a zipper .
[0002]
[Prior art]
Many food, pharmaceutical and industrial products contain volatile components. "Sorption of volatile components to the package" which occurs when these contents are placed in the package is a conventional problem. Particularly, in the case of pharmaceuticals and the like, there are cases in which expensive volatile components are contained in the contents in a large amount in anticipation of sorption to the package in advance. It is also true that various improvements of the packaging bag have been made to eliminate such sorption. For example, when storing orange juice in a beverage container made of paper and plastic material, the innermost layer of the plastic material should be made of a sorbent such as polyethylene or polypropylene in order to prevent the odor components contained in the orange juice from being absorbed. Instead of a large resin, a material mainly composed of a resin having a small sorption, such as polyethylene terephthalate or a saponified ethylene-vinyl acetate copolymer, is used.
[0003]
Under such circumstances, polyacrylonitrile resin is known as a plastic material in which sorption of substances such as d-limonene, which is an aroma component of orange juice, and l-menthol used in pharmaceuticals is hardly observed, It is the most suitable material as the innermost layer of a package for other foods, industrial materials, etc.
[0004]
[Problems to be solved by the invention]
However, since polyacrylonitrile itself is a very rigid resin, even if it can be processed into the form of a zipper body, when the convex and concave molds are fitted, or conversely, the convex and concave forms are separated from the fitted state. In this case, there is a disadvantage that cracks occur and cannot be used as a zipper body material.
Further, since the solubility coefficient is larger than that of other plastic materials, the compatibility with other resins is small, and there is a difficulty in finding a heat-sealable resin.
[0005]
[Means for Solving the Problems]
The present invention relates to a packaging bag with a zipper used for packaging foods, pharmaceuticals, industrial products, and the like, and a method for manufacturing the same.When polyacrylonitrile is used for the plastic material that is the innermost layer of the packaging bag, the polyacrylonitrile surface is used. An object of the present invention is to provide a zipper- equipped packaging bag to which a zipper is well welded and a method for producing the same.
In order to achieve the above object, the present invention has the following inventions (1) and (2) .
(1) In a packaging bag with a zipper formed by welding a zipper body having a concave shape and a convex shape to the inner surface of the packaging bag, the zipper body is polymerized using a linear low-density polyethylene or metallocene catalyst. The innermost layer of the packaging bag is formed of polyethylene or a resin to which an antiblocking agent and / or a slip agent is added, and the zipper body is formed of polyacrylonitrile. A zipper, wherein the zipper body and / or the welding surface on the polyacrylonitrile surface are previously subjected to corona discharge treatment and welded when the inner layer is welded to the polyacrylonitrile surface. Packaging bag .
(2) In the production of a packaging bag with a zipper formed by welding a zipper body having a concave shape and a convex shape to the inner surface of the packaging bag, the zipper body is formed by polymerization using a linear low-density polyethylene or a metallocene catalyst. The packaging bag is formed of low-density polyethylene or a resin obtained by adding an anti-blocking agent and / or a slip agent to any of them, and the innermost layer of the packaging bag is formed of polyacrylonitrile . when welded to polyacrylonitrile surface of the innermost layer, the welding surface and / or the method of manufacturing a zipper packaging bag, characterized in that welding the weld surface to corona discharge treatment on the polyacrylonitrile surface of the zipper member.
It is.
[0006]
In the present invention, the method for producing a zipper body is as follows: a master batch is prepared by mixing an antiblocking agent and / or a slip agent with a linear low-density polyethylene resin, and the zipper body (concave / convex) is formed by profile extrusion. Mold. Even if the zipper body alone was repeatedly fitted, no crack or the like was generated. Preferably, an antiblocking agent and / or a slipping agent are mixed with the linear low-density polyethylene resin in a weight ratio of 2 to 10%.
The linear low-density polyethylene used as the material of the zipper body is a resin having a good sealing property at the time of heat sealing among polyethylenes, and also has properties such as good oil resistance and chemical resistance. Moreover, since it is a relatively soft resin, when molded into a zipper body, it does not crack due to repeated fitting and has good sealing properties.
In particular, linear low-density polyethylene using a metallocene catalyst for polymerization is optimal because it exhibits particularly strong sealing strength due to structural characteristics with uniform molecular orientation.
As the anti-blocking agent, talc, zeolite, diatomaceous earth, silicon oxide, calcium carbonate and the like can be used.
Examples of the slip agent include aliphatic amides such as stearic acid amide, oleic acid amide, erucic acid amide, and behenic acid amide.
Next, corona discharge treatment increases the strength of bonding and thermal welding by causing corona discharge to the surface of the object, causing physical irregularities on the treated surface and oxidation of the chemical structure near the surface. This is done for the purpose.
The processing conditions for the corona discharge treatment are as follows: a discharge gap of 1 to 15 mm, a substrate feeding speed of 100 to 1000 cm / min, and a treatment strength of 300 to 1000 W / m ² / min.
[0007]
The method for producing the packaging bag with a zipper of the present invention will be described.
First of all, the laminate that is the basis of the packaging bag with zipper is
Basically, it is composed of a printing substrate, a barrier layer and an innermost layer of polyacrylonitrile resin. And polyacrylonitrile is a plastic material with low sorption of l-menthol.
Further, when a packaging bag of a preparation containing l-menthol is prepared using this laminate, the bag is made with polyacrylonitrile as the inner surface to prevent sorption of l-menthol in the packaging bag.
[0008]
Next, the polyacrylonitrile resin, the barrier layer, and the printing substrate constituting the laminate that forms the basis of the packaging bag of the present invention will be described in more detail.
Examples of the polyacrylonitrile resin include Hytron BX manufactured by Tamapoly Co., Ltd. and Zeklon manufactured by Mitsui Toatsu Chemicals, Inc.
Barex manufactured by Mitsui Toatsu Chemicals, Inc. can be used as the extrusion grade. The thickness of the polyacrylonitrile layer can be used in the range of 10 to 100 μm, but is preferably 20 to 60 μm.
[0009]
Aluminum foil is most commonly used as the barrier layer, but other metal foils such as gold, silver, copper, iron, lead, and tin can also be used.
Further, a vapor-deposited film in which a metal thin film of aluminum, tin, brass or the like is formed on a PET film or the like by vacuum vapor deposition, sputtering, or the like can also be used.
As the transparent barrier layer, a material obtained by vapor-depositing a metal oxide such as SiO ₂ or Al ₂ O _{3 on} a plastic film such as a PET film can be used.
[0010]
As the printing substrate, those usually used as a printing substrate can be used, and plastic films such as polyethylene terephthalate, polypropylene, nylon, and polyethylene, paper, cellophane, metal foil, and composite films thereof can be used.
[0011]
As a method of laminating the printing substrate, the barrier layer, and the polyacrylonitrile film, a conventionally known dry lamination method, extrusion lamination method, wet lamination method, or the like can be used.
For example, when manufacturing a laminated material having a structure of PET / Al / PAN, PET and Al are laminated by an extrusion lamination method of PE to obtain PET / PE / Al, and further, the laminated material and PAN are dried by a lamination method. Lamination (hereinafter referred to as LMD) is performed to produce a laminated material having a structure of PET / PE / Al / LMD / PAN.
In the case of using an extrusion grade of PAN, first, PAN is extruded into Al to produce an Al / PAN laminate, and the laminate and PET are laminated by a PE extrusion lamination method.
The above symbols indicate the following substances. The same applies hereinafter.
・ PET polyethylene terephthalate ・ PE polyethylene ・ Al aluminum ・ PAN polyacrylonitrile
For example, in a packaging bag of l-menthol or a preparation containing l-menthol, the innermost layer of the packaging bag is made of polyacrylonitrile which suppresses sorption of l-menthol.
That is, a laminated material is prepared using a polyacrylonitrile resin having low sorption of l-menthol, a packaging bag for a preparation containing l-menthol is made using the laminated material, and contact with the preparation containing l-menthol is made. The surface was made of a resin with low sorption of l-menthol.
For example, the laminated material is PET / PE / Al / PAN (contact surface with the preparation).
[0013]
In this laminate, after performing corona discharge treatment on the polyacrylonitrile surface on which the zipper body is welded and / or the welding surface of the zipper body, the zipper body is welded to the laminate by heat sealing, a bottom seal, a side seal, Then, the packaging bag with the zipper was prepared.
Here, the welding surface of the zipper body refers to the back surface of the zipper body base (the surface on the opposite side of the fitting part) that is continuous with the fitting part of the zipper body and spreads perpendicular to the fitting direction. is there.
In the case of a zippered packaging bag of a preparation containing l-menthol thus produced, the innermost layer PAN has a very low sorption of l-menthol, so that the active ingredient of the preparation containing l-menthol is reduced. There is no. In addition, the zipper body has excellent sealing properties, and PAN has sealing properties, so that the active ingredient of the preparation can be sealed. Further, since the aluminum foil is used as the barrier layer, the active ingredient and moisture of the preparation do not volatilize out of the packaging bag, and the effective period can be maintained for a long period of time.
[0014]
[Action]
In the present invention, the linear low-density polyethylene is well welded to polyacrylonitrile and has good properties such as oil resistance and chemical resistance. Moreover, since it is a relatively soft resin, when molded into a zipper body, it does not crack due to repeated fitting and has good sealing properties.
Furthermore, if linear low-density polyethylene using a metallocene catalyst is used for the polymerization, a particularly strong sealing strength will be exhibited due to the structural characteristics with uniform molecular orientation. The corona discharge treatment has a function of increasing the strength of adhesion and heat welding by performing corona discharge on the surface of an object to make the treated surface physically uneven and oxidizing the vicinity of the surface.
[0015]
【Example】
Next, the present invention will be described in detail based on specific examples.
(Example 1) Preparation of zipper body Anti-blocking agent (AB-10) and slip agent (SQ-3) manufactured by Mitsui Petrochemical Industry Co., Ltd. for linear low density polyethylene resin (AFFINITY PF1140) manufactured by Dow Chemical Company. ) Were mixed at a weight ratio of 3% to prepare a master batch, and a zipper body (concave / convex) was formed by profile extrusion. Even if the zipper body alone was repeatedly fitted, no crack or the like was generated.
[0016]
(Example 2) Production of packaging bag with zipper A printing layer was formed by gravure printing on one side of a biaxially stretched polyethylene terephthalate (hereinafter referred to as PET) film (manufactured by Toray Industries, Ltd.) having a thickness of 12 µm as a printing base material. The printed surface and an Al foil having a thickness of 9 μm were laminated by an extrusion lamination method using PE.
[0017]
Next, a polyurethane adhesive (manufactured by Takeda Pharmaceutical Co., Ltd.) was applied to the Al foil surface of the laminated film at a rate of 3 g / m ² (in a dry state) to form a 30 μm-thick PAN as a non-sorbing seal layer. A film (Hytron BX manufactured by Tamapoly Corporation) was laminated by a dry lamination method to produce the following laminated material.
-PET12 / PE15 / Al9 / LMD / PAN30
The number of the layer configuration indicates the thickness, and the unit is μm. The same applies hereinafter.
In this laminate, after performing a corona discharge treatment on the polyacrylonitrile film surface on which the zipper body is welded and the welding surface of the zipper body, the zipper body is welded to the laminate by heat sealing, a bottom seal, a side seal, and The packaging bag with the zipper was produced by separating.
Even when the open / close test was repeatedly performed on the zipper-equipped packaging bag, no peeling of the zipper member from the bag member and no cracking of the zipper member occurred.
In addition, l-menthol was encapsulated in a zipper-equipped packaging bag as a representative of a highly volatile drug, and the weight of the packaging bag before and after standing for three months was almost unchanged.
In addition, the zipper was excellent in hermeticity so that almost no change in the weight of the encapsulated l-menthol was observed and no scattering of l-menthol, which was the content, out of the bag was observed.
[0018]
【The invention's effect】
According to the packaging bag with a zipper and the method for manufacturing the packaging bag with a zipper of the present invention, for example, polyacrylonitrile is used as a plastic material having a very low sorption of contents as an inner layer of a packaging bag for a preparation containing 1-menthol. In addition, the zipper body can be easily welded, and the sealing property and barrier property are good, so that the sorption of the contents to the packaging material becomes very small, and 1-menthol, which is the active ingredient of the preparation, hardly decreases. Therefore, the effective period of the preparation can be maintained for a long period of time.

Claims (2)

In a packaging bag with a zipper formed by welding a zipper body having a concave shape and a convex shape to the inner surface of the packaging bag, the zipper body is a linear low-density polyethylene or a linear low-density polyethylene polymerized using a metallocene catalyst, or One of these is formed of a resin to which an anti-blocking agent and / or a slip agent is added, and the innermost layer of the packaging bag is formed of polyacrylonitrile, and the zipper body is formed of the innermost layer of the packaging bag. A packaging bag with a zipper, characterized in that, when being welded to an acrylonitrile surface, the welding surface of the zipper body and / or the welding surface on the polyacrylonitrile surface are subjected to corona discharge treatment in advance and welded . In the production of a zipper-equipped packaging bag obtained by welding a concave and convex zipper body to the inner surface of a packaging bag, the zipper body is linear low-density polyethylene or linear low-density polyethylene polymerized using a metallocene catalyst. , or a resin added with antiblocking agents and / or slip agents into one of these, and, an innermost layer of the packaging bag and forming polyacrylonitrile, the zipper of the innermost layer of the packaging bag when welded to polyacrylonitrile surface, the welding surfaces and / or manufacturing method of a zipper packaging bag, characterized in that welding the welding surface by corona discharge treatment on the polyacrylonitrile surface of the zipper member.