JPH0390344A - Packaging material having air permeability in plane direction and manufacture thereof - Google Patents

Abstract

PURPOSE:To stable adhesion in an adhesive part and reduce the number of processes by forming lamination in a packaging material through lamination of melted and extruded resin layer of polyolefin. CONSTITUTION:It comprises a support material of the biaxial oriented film of thermoplastic synthetic resin and a filter material having air permeability in the vertical direction and plane direction. And, between both of them, the first melted and extruded resin layer of polyolefin resin is formed and laminated. Next, with respect to the surface of a filter material having an air permeability, the second melted and extruded resin layer is laminated. In consequence, the second resin layer is given a heat needling process and laser process. Whereby there is formed a group of fine holes in a communication type with respect to the vertical direction of the resin layer. As a result, a packaging material is manufactured which has air permeability in the plane direction thereof.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air-permeable packaging material used as a packaging material for enclosing an oxygen absorber, a desiccant, etc., and a method for manufacturing the same. be.

C. Prior Art] A packaging material with air permeability for packaging an oxygen absorber, etc. has an air permeability that allows the oxygen absorber made of iron powder or the like packaged with the packaging material to come into contact with oxygen or air in the atmosphere. 1. For example, a laminated sheet of a support material made of a biaxially stretched thermoplastic synthetic resin film and a polyolefin resin layer for reinforcing the packaging material may be perforated with a hot needle. The obtained first laminated sheet is partially adhered to a second laminated sheet in which a filter material such as paper or non-woven fabric and a polyolefin resin sheet which has been perforated with hot needles are laminated. Multilayer laminated sheets are used.

[Problems to be Solved by the Invention] By the way, the conventional packaging material having air permeability made of a multilayer laminated sheet has separate heating needles for both the first laminated sheet and the second laminated sheet. A small hole drilling process is required, and a large number of sheets are required for the component material, which inevitably increases processing and material costs. Since the adhesive is formed by the above method, it has disadvantages such as poor adhesion stability at the adhesive part and low productivity.

In contrast, the present invention has stable adhesion in the laminated structure, prevents fine powder, etc. inside the packaging material from leaking to the outside of the packaging, and has the same air permeability as the conventional packaging material. An object of the present invention is to provide an air-permeable packaging material that has higher productivity and can be produced at a lower cost than packaging materials having the following properties.

[Means for Solving the Problems] The packaging material having air permeability in the plane direction of the water bottle 1 invention has a support material made of a biaxially stretched film of thermoplastic synthetic resin, and air permeability in the vertical direction and the plane direction. and a polyolefin resin located between the support material and the filter material.

Melting by a first resin layer consisting of an extruded resin layer and a polyolefin resin laminated with the filter material,
It has a laminated structure with a second 1!411W layer made of an extruded resin layer, and furthermore, a group of micropores communicating in the vertical direction is introduced into the second resin layer. .

In addition, the method for manufacturing a packaging material having air permeability in the plane direction according to the invention of Water Bottle 2 uses a supporting material made of a biaxially stretched film of thermoplastic synthetic resin, and a filter material having air permeability in the vertical direction and the plane direction. melting with a first polyolefin resin and laminating them while forming an extruded resin layer between them; melting with a second polyolefin resin on the air-permeable filter material surface;
By laminating extruded resin layers and applying hot needle processing or laser processing to the second polyolefin resin layer, a vertically (thickness direction) communication type is formed only in the resin layer. This process consists of a step of forming a group of micropores.

In the air-permeable packaging material of the present invention having the above configuration and the method for producing the same, the thermoplastic composite fi fit I
The biaxially stretched film support material II provides various physical strengths required for packaging materials, and for example, a film with a thickness of about 10 to 40 μm made of polyester, polypropylene, nylon, etc. can be used. 1
Usually, a biaxially stretched film with back printing is used.

The filter material that has air permeability in the vertical direction (thickness direction) 8 and in the planar direction is, for example, pulp paper, nonwoven fabric, etc., and is usually used that has a filter function of about 20 to 100 g/m''. be done.

A first resin layer made of a resin layer melted and extruded by a polyolefin resin that adheres the supporting material and the filter material.
The resin layer is melted.

Thermoplastic polyolefin resin that can be extruded,
For example, the resin is formed as an extruded resin layer with a thickness of about 10 to 30 microns from low density polyethylene resin, ethylene-ethyl acrylate copolymer resin, ethylene-acrylic acid copolymer resin, etc.

Note that the surface of the support material that comes into contact with the first resin layer is usually made of imine-based or urethane-based material.

An anchor coat treatment using titanium or the like is applied.

Furthermore, it melts against the filter material.

The second resin layer to be extruded and laminated is, for example, a linear low-density polyethylene resin, a low-density polyethylene resin, or a medium-density polyethylene resin.

Ethylene-ethyl acrylate copolymer resin.

It is made of ethylene-acrylic acid copolymer resin, ethylene-vinyl acetate copolymer resin, ionomer resin, etc. to a thickness of about 15 to 60 L1, and is also made of multilayer resin layers by coextrusion. Also good.

By hot needle processing or laser processing applied to the second resin layer, the polyolefin resin layer, which is the second resin layer, has a structure in which the resin layer is vertically (thickness direction)
A group of drilled holes with a diameter of about 100 to 2000μ penetrate through the
They are formed in the second resin layer at a rate of about 10 to 30 pieces/cm11.

[Example] Hereinafter, the specific structure of the packaging material having air permeability in the plane direction of the present invention and the method for manufacturing the same will be explained with reference to Examples.

Example 1 The adhesion-improving treated surface of a support material made of a 12μ thick biaxially oriented polyester resin film (Q-27: Toshishiku Co., Ltd.), which has been subjected to adhesion-improving treatment by corona discharge treatment on one side. Then, a decorative finish was applied by printing, and a urethane anchor coating agent [L-75
: Sumitomo Bayer Urethane Co., Ltd.] was coated.

After that, the surface of the support coated with the urethane anchor coating agent and the filter material [bulb paper: 40g]
/m” (Nagoya Pulp Co., Ltd.) with a thickness of 15 μm.
A layer of low-density polyethylene resin [M-10p+Mitsui Petrochemical Industries, Ltd.] was melted and extruded to obtain a laminated sheet of the support and the filter material.

Subsequently, an ethylene-methacrylic acid copolymer resin [
N0908c + Mitsui Dupont Polychemical Co., Ltd.] was formed with an extrusion coating layer having a thickness of 15μ, and further,
Laser processing is performed on the surface of the extrusion coat layer, and the coat layer has an average diameter of 10 that penetrates the coat layer in the thickness direction.
By forming a group of holes with a diameter of 0μ, a packaging material having air permeability in the plane direction, which is an example of the present invention, was obtained.

[Operations and Effects of the Invention 1 The air-permeable packaging material of the water bottle 1 invention includes a support material made of a biaxially stretched film of thermoplastic synthetic resin, and a filter material that has air permeability in the vertical and planar directions. The air-permeable filter material is laminated with a first resin layer made of a melted and extruded resin layer made of a polyolefin resin, and a second resin layer made of a melted and extruded resin layer made of a polyolefin resin. Resin layers are laminated, and the second resin layer has a group of micropores communicating in the vertical direction,
The supporting material made of biaxially stretched film forms the outer surface layer of the package and is formed into a packaging bag.

Further, the method for producing a packaging material having air permeability in the plane direction according to the second invention includes a supporting material made of a biaxially stretched film of thermoplastic synthetic resin, and a filter having air permeability in the vertical direction and the plane direction. After laminating the materials while forming a first melted and extruded resin layer between them, a second melted and extruded resin layer is applied to the air-permeable filter material surface. , by laminating extruded resin layers and then subjecting the second resin layer to hot needle processing or laser processing,
This process consists of forming a group of vertically communicating microporous pores in the resin layer.

The packaging material having air permeability in the planar direction of the present invention having the above structure is formed by laminating resin layers melted and extruded using polyolefin resin, so that adhesion at the adhesive part is not possible. It is stable, requires fewer steps for laminating layers and forming holes, and can be supplied at a lower price than conventional packaging materials.

In addition, the air-permeable packaging material of the present invention does not have perforations in the biaxially stretched film of thermoplastic synthetic resin, which is the supporting material of the packaging material, so that, for example, iron in the packaging made of the packaging material An air-permeable packaging body that prevents fine powder such as powder from leaking from the packaging material and exhibits excellent sanitary properties can be obtained.

In addition, in the method for manufacturing an air-permeable packaging material according to the second invention, the air-permeable packaging material according to the first invention can be produced with a small number of steps and at high speed. play.

Claims (1)

[Scope of Claims] 1. A supporting material made of a biaxially stretched film of thermoplastic synthetic resin and a filter material having permeability in vertical and planar directions are formed by a resin layer made of a resin layer melted and extruded from a polyolefin resin. 1
The air-permeable filter material is laminated with a second resin layer made of a resin layer melted and extruded from a polyolefin resin. 1. A packaging material having air permeability in a plane direction, characterized in that a resin layer has a group of micropores communicating in a vertical direction. 2. Forming a first melted and extruded resin layer of polyolefin resin between a supporting material made of a biaxially stretched film of thermoplastic synthetic resin and a filter material having permeability in vertical and planar directions. Then, a second melted and extruded resin layer made of polyolefin resin is laminated on the air-permeable filter material surface, and then the second resin layer is subjected to hot needle processing or 1. A method for manufacturing a packaging material having air permeability in a plane direction, the method comprising forming a group of vertically communicating micropores in the resin layer by performing laser processing.