JPS63309438A - Laminated packaging material for food - Google Patents

Abstract

PURPOSE:To obtain a packaging material for food which is capable of performing laminating processing at favorable productivity, by a method wherein aluminum is metallized to the surface of heat-resistant resin film where printing has been performed and its melting point is a fixed temperature or higher and the surface and a cast polypropylene film are stuck close to each other through a low density polyethylene film. CONSTITUTION:A heat resistant film is a resin film such as PP or polyethylene terephthalate or nylon, and it possesses a melting point of 150 deg.C or higher. A film of 5-100mum thick is used for the film and CPP film. The film and normal LDPE are laminated together through an extrusion laminating method or a dry laminating method. The film is constituted of OPP/Al metallized surface/LDPE/CPP and it is preferable to make use of an anchor coat agent between the OPP/Al metallized surface, and the Al metallized surface/LDPE by aiming at an improvement in those adhesive strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to laminate packaging materials for foods such as snack foods. More specifically, low-density polyethylene (hereinafter referred to as L
Aluminum vapor-deposited resin film and polypropylene (hereinafter abbreviated as PP)
This invention relates to food laminated packaging materials made of film.

[Prior art and problems to be solved by the invention] Laminated films with aluminum vapor-deposited on the surface have been widely used as food laminated packaging materials, and most of these are printed biaxially stretched films. Cast PP (hereinafter abbreviated as CPP) is produced by applying an anchor coating agent to the surface of a PP (hereinafter abbreviated as OPP) film, and then coating an ethylene-acrylic acid copolymer (hereinafter abbreviated as EAA) film with aluminum vapor-deposited on the surface. ) A laminated film is used.

However, since such conventional films use aluminum vapor-deposited CPP, they are forced to be processed at low temperatures during extrusion lamination (resin temperature directly below the die is 210~210°C).
220℃). This is because if aluminum-deposited CPP is processed at high temperatures, the heat will cause stretching of the aluminum-deposited CPP, causing so-called "flying" of the aluminum-deposited surface, making it impossible to obtain a uniform layer, and thus severely impairing the appearance of the film. The commercial value of the obtained film decreases.

Furthermore, when EAA is used, the extruder may be corroded by its acid component.

[Means for Solving the Problems] The present inventors have developed a food product that can be processed at high temperatures and that can be laminated with high productivity by combining LDPE with an aluminum entry tube resin that has relatively good heat resistance. The present invention was completed as a result of repeated research aimed at providing packaging materials for

That is, in the present invention, aluminum is vapor-deposited on the surface of a printed heat-resistant resin film with a melting point of 150° C. or higher, with or without an anchor coating agent, and the surface and a cast polypropylene film are bonded via a low-density polyethylene film. The present invention relates to a laminated packaging material for food that is tightly adhered.

Specifically, the heat-resistant resin film constituting the present invention includes:
PP1 is a resin film made of polyethylene terephthalate, nylon, etc. These films and CPP films used have a thickness of 5 to 100 μm.

In the present invention, these films and ordinary LDPC are laminated by, for example, an extrusion lamination method, a dry lamination method, or the like. The line speed at this time is 150 to 200a+/win using the extrusion lamination method.
The dry lamination method takes 100 to 15 hours/win. The structure of the film of the present invention is, for example, as follows.

OPP, etc./Al vapor pipe entry pipe, LDPE/CPP, opp, etc./^! It is preferable to use an anchor coating agent (abbreviated as AC agent) between the vapor deposition surface and the AI vapor deposition surface/LDPC for the purpose of improving adhesive strength.

[Example] Next, the present invention will be explained in more detail with reference to Examples.

Example 1 A CPP film with a thickness of 20 mm was printed, and AL was vacuum-deposited on the printed surface at a vacuum degree of lo-4 ma+Hg (deposition layer thickness: 500 to 1,000 layers) to produce a base material for lamination.

An AC agent (Toyo Soda Kogyo Co., Ltd.'s dehiscence product name "Toyopine 210KJ") was applied to the AI-deposited surface of this base material, and LDPE (
Toyo Soda Kogyo Co., Ltd. (product name: Petrocene 203) melt flow rate 8.0 g/10 minutes, density 0.919) for 15 hours.

For extrusion lamination with a thickness of , the resin temperature directly under the T die is 3.
10~320℃) At the same time, a CPP base material with a thickness of 20 mm is fed out from a sand unwinder, and the OPP printed aluminum evaporation pipe AC agent film and CPP film are transferred through the molten LDPE from the extruder T die at a line speed of 180 m+. /min by extrusion sand lamination processing method. The structure of the obtained film is as follows.

OPP printing/Al vapor deposition C agent DPE/CPPAs a result of measuring the adhesive strength of each film surface, the strength at the location where the interlayer adhesive strength is the weakest (OPP printing/Al vapor deposition) is 60.
g/15+ao+width.

The interlayer adhesion strength was determined by testing the laminated film using a Schopper type tensile tester at a peeling rate of 300 IIli/aln.
It was measured as the strength when peeled off. same as below.

Example 2 After printing on a 022 surface with a thickness of 20 mm, an AC agent (
The same as in Example 1) was coated, and aluminum was vacuum-deposited on the AC agent-coated surface at a vacuum degree of 10'a+m11 g (deposited layer thickness: 500 to 1,000 layers) to create a base material for lamination. The AC agent (same as above) was coated on the AI vapor deposition surface of the base material, and LDPIE (same as in Example 1) was extruded and laminated to a thickness of 15 mm (resin temperature directly under the T die was 310-320°C), and at the same time, for sand Unwind the CPP base material with a thickness of 20 m+s from the unwinder, and
PP printing/AC agent/AI vaporized 8AC agent coated film and C
The PP film was extruded at a line speed of 180 m/+In by an extrusion sand lamination process, and both base materials were bonded together via LDPE melted from the T die of the extruder.

The structure of the film is as follows.

OPP printing C agent/At vapor deposition C agent DPE/CPP The strength at the location where the interlayer adhesive strength was the weakest (OPP/printing) was 120 g/15 ml width.

Comparative Example 1 After printing a 20mm thick CPP film, AC was applied to the printed surface.
Aluminum was vacuum evaporated at a vacuum level of 1 G' mm and 11 g on a base material coated with a coating agent (same as in Example 1) and an OPP film with a thickness of 20 mm (thickness of the deposited layer was 500 to 1 G' mm).
Yucalon EAA (Mitsubishi Yuka Co., Ltd.) was melted from an extruder T die using an extrusion sand lamination processing method.
XA-211S-1, MPR 25g 710 minutes, acrylic acid content g, 5wd) to both substrates at a resin temperature of 210 to 220°C directly under the die at a line speed of 150 m/n+
It was bonded with In. The structure of the film is as follows.

opp printing C7\II/EAA/AI vapor-deposited CPP The strong melon at the place where the interlayer adhesion strength is the weakest (AI/vapor-deposited CPP) was 20g715m+a width.

[Effects of the invention] The present invention provides printing on the surface of a resin used as a base material,
Since aluminum is vapor-deposited on the surface, extrusion lamination with LDPE is possible and productivity is good. Adhesion strength on each surface is high and gas barrier properties are also good, so it can be used as a food packaging material. suitable.

Procedural amendment August 11, 1986

Claims (1)

[Claims] 1) Aluminum is deposited on the surface of a printed heat-resistant resin film with a melting point of 150° C. or higher, with or without an anchor coating agent, and the surface and the cast polypropylene film are coated with low-density polyethylene. A laminated packaging material for food that is adhered via a film. 2) Claim 1 in which the heat-resistant resin is biaxially oriented polypropylene, polyethylene terephthalate, or nylon.
Packaging materials listed in section.