JP2004058515A - Laminate for molding, and container and package using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminate for molding, which prevents the occurrence of nonuniform wrinkles and cracks, delamination, etc., and a container and a package using the laminate. <P>SOLUTION: In this laminate 1, an outer covering film 3 is laminated on one side of aluminum foil 2 via an adhesive layer 5a, and a thermal adhesion layer 4 is laminated on the other side thereof via an adhesive layer 5b. When the laminate 1 is molded for the formation of many pocket parts, the container can be obtained; and when openings of the pocket parts are sealed with lid materials after contents are housed in the pocket parts, the package can be obtained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a molding laminate used for packaging medicines, foods, and the like, and a container and a package using the same.
[0002]
[Prior art]
Conventionally, as a material on the container side of a press-through pack (hereinafter, referred to as PTP), a single layer of a vinyl chloride sheet or a polypropylene sheet, or a laminate of PET / aluminum foil / sealant film has been used. I have. On the other hand, as the material of the lid material side, a material obtained by coating a heat bonding resin on an aluminum foil is often used. As the contents of PTP are many drugs (tablets), the aluminum foil, which is the material of the lid material, is cracked by pressing with a finger from the container side, and the drugs (tablets) can be easily taken out. I have. However, some drugs (tablets) dislike moisture and ultraviolet rays, and some contain volatile components. Therefore, a higher barrier property (airtightness) is required, and the material for the container side is the latter. Laminates are preferred.
[0003]
[Problems of the Invention]
However, in the conventional laminate composed of PET / aluminum foil / sealant film, since a biaxially stretched PET film is employed as the PET film, the heat of MD (stretching direction) and TD (direction perpendicular to the stretching direction) is generated. (Hot water) The shrinkage ratio varies greatly, causing uneven wrinkles and cracks during thermal bonding (mesh seal) between the container and the lid material, and peeling between layers of PET / aluminum foil or aluminum foil / sealant film. Lamination), the appearance was unsightly, and the commercial value was reduced.
[0004]
Therefore, an object of the present invention is to provide a laminate, a container, and a package that do not cause uneven wrinkles, cracks, or delamination.
[0005]
[Means for solving the problem]
In order to solve the above-mentioned problems, in the present invention, as a material on the container side of PTP, a lamination for molding in which a stretched polyamide-based resin layer, an adhesive layer, an aluminum foil, an adhesive layer, and a thermal adhesive layer are sequentially laminated. He adopted the body. The ratio (MD / TD) of the hot water shrinkage (100 ° C. × 30 minutes) in MD and TD of the stretched polyamide-based resin layer is preferably 0.9 to 1.1. It is preferable that the softening point of at least one coating after curing is 180 ° C. or higher. It is further preferable that at least one of the adhesive layers is a polyester polyol-based adhesive and has a molecular weight of 30,000 or more. With these configurations, uneven wrinkles and delamination (delamination) are eliminated. Further, by setting the iron component content of the aluminum foil to 0.5 to 2.0% by weight, deep drawing or bulging when forming into a container becomes easy. Using these laminates, a container having a storage recess for the content is molded, and a lid material containing an aluminum foil prepared separately is heat-sealed, for example, a PTP package whose content is a drug may be used, It is good also as a package which heat-bonded the formed containers.
[0006]
Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, the laminate for molding 1 has an aluminum foil 2, on one side of which an exterior film 3 is laminated via an adhesive layer 5 a, and on the other side, a thermal adhesive layer 4 is laminated via an adhesive layer 5 b. Things.
[0007]
The aluminum foil 2 may be either a pure aluminum foil or an aluminum alloy foil, such as pure aluminum (JIS (AA) 1000 series, for example, 1N30, 1N70, etc.), Al-Mn series (3000 series, for example, 3003, Materials such as 3004), Al-Mg-based (5000-based), Al-Fe (8000-based, for example, 8021, 8079, etc.) aluminum alloy foils can be used. Of these, aluminum foil having an iron content of 0.5% by weight or more, such as 8021 or 8079, is particularly preferable, and an iron content of 0.7 to 2.0% by weight is more preferable. By setting the iron content to 0.5% by weight or more, the moldability can be improved without impairing the moisture resistance, light shielding properties, and shape retention of the container. As for components other than iron, for example, Si, Cu, Ni, Cr, Ti, Zr, Zn, Mn, Mg, Ga, etc., any components within the range of known contents defined by JIS and the like can be used. It may be included. The thickness of the aluminum foil is preferably about 20 to 80 μm, more preferably 25 to 60 μm. Within these ranges, the moisture resistance, light-shielding properties, and shape retention of the container can be maintained without impairing the moldability. Further, the aluminum foil is preferably a semi-hard material or a soft material, and is preferably subjected to at least one heat treatment (usually 200 to 500 ° C.) after rolling. In the case of a hard material, the residual stress is likely to be large, and flexibility and oil residue are not desirable. By interposing the aluminum foil 2 as described above, the moisture resistance and the light-shielding property of the container are improved, and the container can be stored for a long time at room temperature, and the moldability and shape retention can be improved.
[0008]
As the exterior film 3, a stretched polyamide resin, particularly a biaxially stretched polyamide resin film, is suitable, and the ratio (MD / TD) of the hot water shrinkage ratio (100 ° C. × 30 minutes) in MD and TD is appropriate. , 0.9 to 1.1, and more preferably 0.95 to 1.05. When the hot water shrinkage ratio (MD / TD) is less than 0.9 or more than 1.1, the effect of the present invention cannot be obtained, and the heat-sealing (mesh sealing) between the container side and the lid material side is not possible. In addition, cracks and uneven wrinkles occur, and delamination occurs between layers of the polyamide resin / aluminum foil or the aluminum foil / sealant film. The thickness of the exterior film 3 is preferably about 10 to 50 μm, and within this range, good moldability, covering property, and protective function can be obtained. The hot water shrinkage (%) conforms to JIS K6782, but the heating temperature is 100 ° C., the heating time is 30 minutes, and the heat medium is water.
[0009]
The thermal bonding layer 4 includes, for example, high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear linear polyethylene, saturated polyester, linear saturated polyester, undrawn polypropylene (CPP), chlorinated polypropylene, and EAA (ethylene-acrylic). Acid copolymer), EMAA (ethylene-methacrylic acid copolymer), EEA (ethylene-ethyl acrylate copolymer), EMAC (ethylene-methyl acrylate copolymer), ionomer, bondyne (ethylene / ethyl acrylate / maleic anhydride) Acid terpolymer: Sumitomo Chemical Co., Ltd.), Mercene M (polyolefin adhesive resin: Tosoh Corporation), carboxylic acid-modified polyethylene, carboxylic acid-modified polypropylene, carboxylic acid-modified EVA, vinyl chloride, polystyrene, etc. Choose from You can adopt at least one, in particular cast polypropylene Among these, vinyl chloride is preferred. The thickness of the heat bonding layer 4 is preferably about 20 to 100 μm, and more preferably 40 to 80 μm. The heat sealing conditions are appropriately selected depending on the resin / film to be used, but are usually from 140 to 260 ° C. for about 1 to 3 seconds. A ring seal (also referred to as a line seal) having a concave cross-sectional shape after sealing or a mesh seal having a continuous uneven shape (jagged shape) after sealing may be applied.
[0010]
It is desirable to use a reactive adhesive for the adhesive layers 5a and 5b for bonding the layers 2, 3, and 4 to each other. As a main component of the adhesive, it is preferable to use a polyester-based or polyester-urethane-based adhesive, and the coating amount is about 0.5 to 10.0 g / m ² . If it is less than 0.5 g / m ² , the adhesive strength may be insufficient. On the other hand, if it exceeds 10.0 g / m ² , no further improvement in the adhesive strength is observed, which is not desirable in terms of moisture resistance and economic efficiency. As a curing agent, an aliphatic or aromatic isocyanate can be used. In particular, in the present invention, it is most preferable that the polyester polyol adhesive is a heat-reactive type polyester polyol composed of two or more liquids and has a molecular weight of 30,000 or more and a softening point after curing of the coating film of 180 ° C. or more. The bonding method is not particularly limited, but is preferably a dry lamination method. When a special interfacial adhesive force is required between the aluminum foil 2 and the adhesive layers 5a and 5b, it is effective to use a wash primer for the aluminum foil 2.
[0011]
In addition to the above-mentioned exterior film 3, aluminum foil 2, and heat bonding layer 4, an intermediate resin film or the like may be further interposed as necessary. As the intermediate resin film, a polyethylene-based film, a polyester-based film, a vinyl chloride-based film, a polypropylene-based film, or the like can be used as needed. Further, an optional layer may be provided with an anchor coat layer, a printing / coloring layer, a primer layer, an overcoat layer, and the like, if necessary.
[0012]
The laminated body 1 is molded to form a container 1a having a pocket 6 serving as a storage recess for the content A as shown in FIG. The method of forming the pocket portion 6 is not particularly limited, but may be, for example, cold forming or warm forming by stretch forming, deep drawing forming, vacuum forming without using a press, pressure forming, or the like using a press machine. A combination of the two may be used.
[0013]
In the case of using the lid member 10 (FIG. 2), a known lid member can be employed. For example, OP varnish (1.5 g / m ² ) / print layer / aluminum foil (thickness 20 μm) / polypropylene A cover material 10 including an aluminum foil such as a coat (3.5 g / m ² ) can be used. On the other hand, when the lid member 10 is not used, as shown in FIG. 3, the open surfaces of the container 1a can be used as a package by bonding the open surfaces by thermal bonding.
[0014]
[Examples and Comparative Examples]
A stretched polyamide resin film (thickness: 25 μm) having a different hot water shrinkage ratio (100 ° C. × 30 minutes) ratio (MD / TD) in MD and TD is softened to one surface of an aluminum foil (thickness: 40 μm) having a different iron content. Lamination was performed using adhesives having different points (application amount after drying: 3.5 g / m ² ). A vinyl chloride (PVC) film for thermal bonding (PVC) (thickness: 60 μm) is further bonded to the other surface of the aluminum foil using the same type of adhesive (amount of coating after drying is 3.5 g / m ² ) to form a laminate for molding. did.
[0015]
A pocket having a diameter of 30 mm and a depth of 10 mm was plug-assisted in the laminate.
[0016]
The molded laminate (container) was heated in an oven at 200 ° C. for 30 seconds, and the presence or absence of cracks and peeling (delamination) near the molded portion was visually evaluated. FIG. 4 shows the evaluation results. In the figure, ○ in the evaluation column indicates that there is no cracking or peeling of the film, and X indicates that there is cracking or peeling of the film. * 1 to 11 indicate that the following materials were used.
* 1 Biaxially stretched nylon film manufactured by Mitsubishi Chemical Kojin Pax Co., Ltd. * 2 Biaxially stretched nylon film manufactured by Mitsubishi Chemical Kojin Pax Co., Ltd. * 3 Biaxially stretched nylon film manufactured by Toyobo Co., Ltd. * 4 Toyobo Co., Ltd. Axial stretched nylon film * 5 JIS 8079 Soft aluminum foil * 6 JIS 8021 Soft aluminum foil * 7 JIS 1050 Soft aluminum foil * 8 Toyo Morton Co., Ltd. dry laminating adhesive * 9 Toyo Morton Co., Ltd. dry laminating adhesive * 10 Adhesive for dry lamination manufactured by Dainippon Ink and Chemicals, Inc. * 11 Vinyl chloride film for general-purpose thermal bonding
【effect】
According to the present invention, as described above, an appropriate resin is selected as an aluminum foil excellent in moldability, a polyamide synthetic resin film having a small difference in hot water shrinkage in MD / TD, and a laminating adhesive. Since the molding laminate is formed by the molding, cracking and peeling at the time of heat sealing after pocket molding can be eliminated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a molding laminate of the present invention. FIG. 2 is a cross-sectional view showing an example of a package. FIG. 3 is a cross-sectional view showing another example of a package. Table showing comparative examples [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Molding laminated body 1a Container 2 Aluminum foil 3 Exterior film 4 Thermal adhesive layer 5a, 5b Adhesive layer 6 Pocket part 10 Cover material A Contents

Claims (8)

A laminate for molding in which a stretched polyamide-based resin layer is laminated on one side of an aluminum foil and a thermal bonding layer is laminated on the other side via an adhesive layer. 2. The molding laminate according to claim 1, wherein the stretched polyamide resin layer has a ratio (MD / TD) of hot water shrinkage (100 ° C. × 30 minutes) in MD and TD of 0.9 to 1.1. 3. . The molding laminate according to claim 1, wherein a softening point of at least one of the adhesive layers after curing of the coating film is 180 ° C. or higher. The molding laminate according to any one of claims 1 to 3, wherein at least one of the adhesive layers is a polyester polyol-based adhesive and has a molecular weight of 30,000 or more. The molding laminate according to any one of claims 1 to 4, wherein the iron content of the aluminum foil is 0.5 to 2.0% by weight. A container in which at least a part of the laminate according to any one of claims 1 to 5 is molded to form a storage recess for contents. A package in which, after filling the molded part of the container according to claim 6 with a container, a lid member including at least an aluminum foil is heat-sealed. The press-through pack package according to claim 7, wherein the storage item is a medicine.

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