JPS6184230A - Manufacture of bag-like laminate for sterilized pack - Google Patents

Abstract

PURPOSE:To contrive to produce a bag-like laminate kept easily at sterilized state at low cost by laminating skin layers on both surfaces of flat long bag-like blank material, while sealing both opening ends of the tube-like inflation film into which sterilized air has been introduced. CONSTITUTION:One end of the film 8 extruded from an extruded 7 is sealed, and sterilized air is sent thereinto from a feeding port 9, thereby inflating the film 8 and obtaining the specified size of a space, and then simultaneously its inside is sterilization-treated. The film 8 is formed into a flat tube-like infla tion film 12 by guide plates 10 and rollers 11, and a long bag-like blank material 1 is obtained, while sealing other end of the film 12. Next, both the front and rear surfaces of the blank material 1 are laminated with skin layers 2. After the skin layers 2 have been coated with adhesive, they pass through a drying hood 14, whereby adhesive layer 3 is formed. Then the skin layer is laminated on the flank material 1. The laminate 4 laminated with skin layers 2 on both surfaces of the blank material 1 is obtained, while compressing said laminate by rollers 15.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a bag-like laminate for sterile packaging.

[Conventional technology]

In recent years, packaging materials made of various types of laminates that have undergone aseptic processing have been used for packaging foods, etc., and this type of packaging material has conventionally been made into various sheets or sheets according to the purpose of use using dry lamination methods etc. By manufacturing a laminate of films, then subjecting this laminate to sterilization treatment by irradiation with ultraviolet rays or electron beams, chemical treatment with hydrogen peroxide, acetic acid, etc., heat treatment, etc., and then forming it into a bag shape, etc. Manufactured.

[Problem that the invention seeks to solve]

However, in the past, aseptic processing was performed in a separate process, which made the manufacturing process complicated, resulting in a decrease in production efficiency, and the drawback was that a large amount of capital investment was required for equipment for aseptic processing.

[Means for solving problems]

As a result of intensive research in view of the above points, the present inventor has developed a long bag-like substrate obtained by sealing both open ends of a tubular inflatable film produced by pumping sterile air and forming it into a flat shape. The inventors have discovered that by laminating surface materials on both sides of the material, it is possible to efficiently and inexpensively produce a bag-like laminate for sterile packaging, which can easily maintain a sterile state, and have completed the present invention.

That is, the present invention seals one end of a tube-shaped blown film extruded from an extruder, blows sterile air into the inside of the blown film to inflate it to a predetermined size, and then forms it into a flat tube. The other end of the blown film is sealed to obtain a long bag-like base material whose inside is sterilized, and then a surface layer material is supplied from both the front and back sides of the base material, and the surface layer material is used as a base material. This is a method for producing a bag-like laminate for sterile packaging by laminating both sides of the bag.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a longitudinal section in the width direction of a bag-like laminate for aseptic packaging manufactured by the method of the present invention, in which 1 is a base material, 2
．． 2 is a surface material, and the surface materials 2, 2 are laminated on both sides of the base material 1 via an adhesive layer 3.3, thereby forming a bag-like laminate 4 for aseptic packaging. There is.

The base material 1 has a long bag shape formed by making a long tube-like inflation film into a flat shape and sealing both open ends. ing. Both open ends of the blown film are sealed with heat seals, sterile tape, or the like.

As the inflation film forming the base material 1,
Polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-vinyl acetate copolymer, saponified ethylene-vinyl acetate copolymer, ethylene- α-olefin copolymer elastomer, styrene-butadiene-acrylonitrile copolymer, styrene-acrylonitrile copolymer, polyamide, polycarbonate, polysulfone, polyacetal, polymethyl methacrylate, polyphenylene oxide, polyurethane, polyethylene terephthalate, polybutadiene terephthalate, etc. It is also possible to use a multilayer blown film formed by extruding the thermoplastic resin into multiple layers by a coextrusion method.

Table MHt 2.2,! : Films made of thermoplastic resin similar to blown films, paper, metal foils, laminated films of these, etc. are used as the surface layer material 2.
2 can also be printed if necessary.

Adhesive layer 3.3 bonding the base material 1 and the surface material 2.2
For this purpose, acrylic adhesives, epoxy adhesives, urethane adhesives, rubber adhesives, ultraviolet curable adhesives, electron beam curable adhesives, etc. are used. These m lli agents c,
Coating is performed using known methods such as barcode coating, knife coating, roll coating, curtain flow coating, and spray coating.

When manufacturing the laminate 4, first, as shown in FIG. 2, one end of a tubular blown film 8 extruded from an extruder 7 equipped with an inflation die 6 is sealed, and the , sterile air is fed through the air supply port 9 to inflate the blown film 8 to a predetermined size, and the inside of the blown film 8 is sterilized.

As the sterile air, for example, air that has been sterilized by passing through a sterile filter is used. The blown film 8, which has been inflated to a predetermined size and subjected to sterilization, is formed into a flat shape by a guide plate 10.10 and pinch rollers 11, 11 to obtain a flat, tube-shaped blown film 12. By sealing the other end of the film 12, a long bag-shaped base material 1 is obtained. Next, as shown in FIG.
Surface layer materials 2, 2 are laminated on both the front and back surfaces. Surface material 2.2
After being coated with adhesive in the adhesive applicator 13.13, they are passed through a drying hood 14.14 to form an adhesive layer 3.3, which is then superimposed on the substrate 1 and transferred to a nip roll. 15.15, an m-laminated body 4 in which the surface layer material 2.2 is laminated on both the front and back surfaces of the base material 1 is obtained.

In the above embodiment, the case where the adhesive was applied to the surface layer material 2.2 side was shown, but the adhesive may be applied to the base material 1 side. Further, the blown film may be manufactured using a multilayer blown film manufacturing apparatus using a coextrusion method.

Next, the present invention will be explained in more detail by giving specific examples.

Example 1 A long bag-like bag whose inside was sterilized was formed by flattening a blown film (thickness: 30μ) made of polyethylene produced by blowing sterile air and sealing both open ends. Surface layer materials were laminated on both sides of the base material to obtain a laminate. The surface layer material used was one in which polyethylene terephthalate (1.2 microns thick), aluminum foil (9 microns thick), and stretched nylon (15 microns) were laminated using a two-component reactive polyurethane adhesive.

Further, as an adhesive for laminating the base material and the surface layer material, a two-component reactive polyurethane adhesive was used by applying it to the stretched nylon side of the surface layer material.

Next, the obtained laminate is cut into a predetermined length in an aseptic filling machine to form a packaging bag so that the inner surface of the sterilized laminate becomes the inner surface, and the bag is filled with orange juice and sealed. Although 10,000 packages were produced, all packages were maintained in a sterile state.

〔Effect of the invention〕

As explained above, according to the method of the present invention, sterilization can be performed simply by feeding sterile air into the blown film constituting the base material, thereby eliminating the complexity of performing sterilization in a separate process. Since there is no need for expensive equipment for aseptic processing, an excellent bag-like laminate for aseptic packaging can be produced efficiently and at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view in the width direction of a bag-like laminate for aseptic packaging manufactured by the method of the present invention, and FIG. 2 shows the manufacturing process of the base material. FIG. 3 is a schematic diagram showing the process of laminating a surface layer material on a base material. DESCRIPTION OF SYMBOLS 1... Base material, 2... Surface layer material, 4... Bag-like laminate for aseptic packaging, 5... Inner cavity of base material, 7... Extruder, 8
...Tubular inflation film, 12.
・・Flat natube-shaped blown film Fig. 1 Fig. 3

Claims (1)

[Claims] One end of the tubular blown film extruded from an extruder is sealed, sterile air is pumped into the inside of the blown film to inflate it to a predetermined size, and the film is then formed into a flat shape. The other end is sealed to obtain a long bag-shaped base material whose inside is sterilized, and then a surface layer material is supplied from both the front and back sides of the base material, and the surface layer material is laminated on both sides of the base material. A method for producing a bag-like laminate for sterile packaging, characterized by: