JP2005262696A - Laminated packaging material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated packaging material having excellent gas barrier properties, light screening properties, and opacifying properties, and through which a printed layer such as a picture pattern can be clearly seen. <P>SOLUTION: The laminated packaging material comprises a laminated body wherein on one face of a water-resistant paper (4) prepared by sequentially laminating water-resistant coating layers (2a and 2b), clay coat layers (3a and 3b) on both faces of a paper substrate layer (1), a printed layer (6) and a polymer film layer (7) are sequentially laminated, and on the other face, a light screening coat layer (8), a gas barrier layer (9) and a sealant layer (10) are sequentially laminated. The clay coat layers (3a and 3b) comprises a mixture of a kaolin filler and a polymer resin as a main component. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packaging material that is used in the field of packaging foods, pharmaceuticals, medical products, and the like and has both gas barrier properties and light shielding properties.

Various functions are required for laminated packaging materials used for packaging foods, pharmaceuticals, pharmaceuticals, etc. Among them, gas barrier properties to suppress alteration of contents, light shielding properties such as visible light, contents In order to provide functions such as concealment of objects, a laminate of an aluminum foil or an aluminum vapor deposition film has been conventionally used. However, packaging materials in which aluminum foil or aluminum vapor deposition film is laminated are discarded, and there is an adverse effect such as damaging an incinerator during incineration, and there is an increasing demand for alternative packaging materials. As an alternative packaging material, a packaging material has been proposed in which a vapor-deposited thin film layer of an inorganic oxide such as silicon oxide is laminated on a base film, and a gas barrier film is further laminated thereon and a sealant layer is laminated on the gas barrier film. (For example, refer to Patent Document 1).
Japanese Patent No. 2790054

  There are many methods of laminating a light-shielding ink layer in the middle in order to give the proposed packaging material further light-shielding and concealing properties, but printing of a pattern or the like on the light-shielding ink layer When the layers were laminated, the printed layer appeared to be sunk, and the commercial value was impaired.

  The subject of this invention is providing the laminated packaging material which has the outstanding gas-barrier property, light-shielding property, and concealment property, and the printed layer, such as a pattern, can be seen clearly.

  In the invention according to claim 1 of the present invention, a printing layer and a polymer film layer are sequentially laminated on one surface of water-resistant paper in which a water-resistant coating layer and a clay coating layer are sequentially laminated on both sides of a paper base material layer. A laminated packaging material comprising a laminate in which a light-shielding coat layer, a gas barrier film layer, and a sealant layer are sequentially laminated on the other surface.

  The invention according to claim 2 of the present invention is the laminated packaging material according to the invention according to claim 1, wherein the clay coat layer is mainly composed of a mixture of a kaolin filler and a polymer resin. It is.

  The laminated packaging material of the present invention has a printing layer and a polymer film layer sequentially laminated on one side of a water-resistant paper in which a water-resistant coating layer and a clay coating layer are sequentially laminated on both sides of a paper base layer. Because it consists of a laminate in which a light-shielding coat layer, gas barrier film layer, and sealant layer are sequentially laminated on the surface, it has excellent gas barrier properties, light-shielding properties and concealment properties, and even when viewed from the polymer film layer side, it is a printed layer Looks clear and does not impair product value. In addition, if the clay coat layer is composed mainly of a mixture of a kaolin-based filler and a polymer resin, the organic solvent of the printing ink used during the lamination of the printing layer is less adsorbed, and the residual solvent of the laminated packaging material The odor is reduced and good.

  The laminated packaging material of the present invention will be described in detail below along the embodiments.

  FIG. 1 is a side sectional view showing an embodiment of the laminated packaging material of the present invention, in which a water-resistant coating layer (2a, 2b) and a clay coating layer (3a, 3b) are sequentially formed on both sides of a paper base material layer (1). An adhesive layer (5a), a printing layer (6), and a polymer film layer (7) are laminated on one side of the laminated water-resistant paper (4), and a light-shielding coating layer (8) on the other side, The adhesive layer (5b), the gas barrier film layer (9), the adhesive layer (5c), and the sealant layer (10) are laminated.

The paper base layer (1) is made of paper having a basis weight of 60 to 130 g / m ² , and the quality of the paper is preferably high quality paper.

The water-resistant coating layer (2a, 2b) is made of natural rubber as a main component and has excellent water resistance. As a lamination method, a latex in which natural rubber is dispersed is formed by a known roll coating method, gravure coating layer or the like. The coating amount is 0.5 to 10 g / m ² (dry state).

The clay coat layer (3a, 3b) is composed mainly of a mixture of a kaolin filler and a polymer resin, and the polymer resin is preferably an acrylate resin or a styrene-butadiene resin. In the lamination method, a coating liquid containing the mixture as a main component is formed by a known roll coating method, air knife method, or the like. The coating amount is 0.5 to 1.0 g / m ² (dry state). Since the clay coat layer (3a, 3b) is composed mainly of a kaolin-based filler and a polymer resin, the ink of the printing layer is more compared to the conventional one composed mainly of calcium carbonate and a polymer resin. The adsorbed amount of organic solvent used in is small, and the residual solvent odor is small.

A polyurethane-based adhesive is used for the adhesive layers (5a, 5b, 5c). Usually, a two-component type is used in which a main component having a hydroxyl group and a curing agent having an isocyanate group are mixed in two components. The lamination method is carried out by a known gravure coating method, and the coating amount is preferably 1 to 5 g / m ² (dry state).

  The printing layer (6) is formed using a commonly used printing ink in which a pigment, a binder resin, an additive and an organic solvent are mixed. Binder resins include cellulose resins, polyamide resins, cellulose / polyamide mixed resins, vinyl chloride / vinyl acetate copolymer resins, modified polyolefin resins, acrylic resins, polyester resins, chlorinated rubber resins, and cyclized rubbers. Resin, urethane resin or chlorinated polypropylene resin can be used.

  The film used for the polymer film layer (7) is ordinary cellophane, moisture-proof cellophane, biaxially stretched polyester film (PET film) having a thickness of 6 to 12 μm, and biaxially stretched polypropylene film (OPP film) having a thickness of 20 to 30 μm. A biaxially stretched nylon film (ONy film) having a thickness of 15 to 25 μm is used.

The light-shielding coat layer (8) is composed mainly of activated carbon or a mixture of carbon black and acrylic resin, and has excellent light-shielding properties and concealing properties. In the laminating method, a coating liquid mainly composed of activated carbon or a mixture of carbon black and an acrylic resin is applied and dried by a known roll coating method or gravure coating method. The coating amount is 0.5 to 10 g / m ² (dry state).

The gas barrier film layer (9) is a vapor-deposited nylon film in which an inorganic oxide vapor-deposited thin film layer and a gas barrier coating layer are laminated on one surface of a biaxially stretched nylon film having a thickness of 15 to 25 μm. By using a biaxially stretched nylon film, excellent piercing resistance and pinhole resistance can be obtained, and by using aluminum oxide or silicon oxide as an inorganic oxide, it is transparent and has excellent gas barrier properties. .

  The sealant layer (10) is made of a polyolefin-based resin, such as a low density polyethylene resin, a linear low density polyethylene resin, a medium density polyethylene resin, a high density polyethylene resin, an ethylene / α-olefin copolymer resin, and the like. And polypropylene resins such as homopolypropylene resins, homopolypropylene resins, propylene / ethylene random copolymers, propylene / ethylene block copolymers, and polypropylene / α-olefin copolymers. The thickness is 80 to 150 μm.

It is a sectional side view which shows one Embodiment of the laminated packaging material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Paper base material layer 2a, 2b ... Water-resistant coating layer 3a, 3b ... Clay coating layer 4 ... Water-resistant paper 5a, 5b, 5c ... Adhesive layer 6 ... Printing layer 7 ... Polymer film layer 8 ... Light-shielding coating layer 9 ... Gas barrier film layer 10 ... Sealant layer

Claims (2)

  A printing layer and a polymer film layer are sequentially laminated on one side of a water-resistant paper in which a water-resistant coating layer and a clay coating layer are sequentially laminated on both sides of a paper base material layer, and a light-shielding coating layer and a gas barrier film are laminated on the other side. A laminated packaging material comprising a laminate in which a layer and a sealant layer are sequentially laminated.   2. The laminated packaging material according to claim 1, wherein the clay coat layer is composed mainly of a mixture of a kaolin filler and a polymer resin.

Images