JPH0727839U - Lid for gas pack packaging of raw meat - Google Patents

Abstract

(57) [Summary] [Purpose] As a lid material for gas pack packaging, it has excellent storability, and the layers of the lid material can be easily peeled off at the store.
(EN) Provided is a lid material that allows oxygen to pass therethrough to clearly color the packed raw meat. [Structure] A polyolefin resin layer (1) is arranged on the seal side, and a gas barrier resin layer (2) is arranged on the outer side via an adhesive layer (4) made of an adhesive resin, and the polyolefin resin layer (1) and the gas barrier resin layer are arranged. The interlayer adhesive strength of (2) is 5
The range of 0 to 200 gf / 15 mm width, the maximum breaking strength of the polyolefin resin layer (1) is 300 to 1500 gf / 1
A lid material for packaging a raw meat gas pack, which has a width of 5 mm. [Effect] It has a good balance between gas barrier properties and delamination properties, and can be suitably used as a lid material for packaging raw meat gas packs.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lid material for packaging raw meat gas packs, which has excellent storability particularly as a lid material for packaging gas packs, and allows the layers of the lid material to be easily peeled off at the store to allow oxygen to permeate. The present invention relates to a lid material capable of clearly coloring the packed raw meat.

[0002]

[Prior art and its problems]

 As a method for packing raw meat in a gas pack, the raw material is usually stored in a bottom material, filled with an inert gas such as nitrogen gas, and covered with a lid material, which enables long-term storage. In this packaging, the color of raw meat is poor because it is filled with an inert gas, and when it is sold at the store, it is necessary to display the raw meat after coloring it.As a means for that, the gas barrier layer and the seal layer are used. It is known that the composite film is used as a lid material and used as it is during storage. At the store, the gas barrier layer is peeled off to color the raw meat before it is displayed.

However, according to this method, depending on the composite film used, there is a problem that it is difficult to separate the layers and the entire lid material is broken.

[0004]

[Means for Solving the Problems]

 The present invention has found a lid material that can solve the above-mentioned problems, and the gist thereof is that a polyolefin resin layer 1 is provided on the seal side and a gas barrier resin layer 2 is provided on the outer side and an adhesive layer 4 made of an adhesive resin The polyolefin resin layer 1 and the gas barrier resin layer 2 have an interlayer adhesive strength in the range of 50 to 200 gf / 15 mm width and a maximum breaking strength of the polyolefin resin layer 1 in the range of 300 to 1500 gf / 15 mm width. It is a lid material for packaging a gas pack of raw meat, which is characterized in that

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of the lid member of the present invention. Explaining the structure of the composite film used for the lid material of the present invention, the polyolefin resin layer 1 is arranged on the seal side which is heat-sealed with the bottom material. As the polyolefin resin, a usual polyethylene resin or ethylene-vinyl acetate copolymer is used. Polyolefin resin having excellent heat sealing property such as resin can be preferably used.

A gas barrier resin layer 2 is disposed on the surface opposite to the seal side with an adhesive layer 4 made of an adhesive resin interposed therebetween. As the gas barrier resin used for the gas barrier resin layer 2, a saponified ethylene-vinyl acetate copolymer or a vinylidene chloride resin can be used. As shown in FIG. 1, a multilayer may be used, or an ethylene-vinyl acetate copolymer saponified product. Compound layer 21 and a polyamide resin 22 such as nylon-6 or nylon-6 / 66 for imparting film strength are laminated and combined.

An adhesive layer 4 made of an adhesive resin is provided between the polyolefin resin layer 1 and the gas barrier resin layer 2, and the interlayer adhesive strength between them must be within a specific range. Here, as the adhesive resin used for the adhesive layer 4, a resin containing a modified polyolefin resin grafted with at least one monomer selected from unsaturated carboxylic acids or its derivatives as a main component can be preferably used. As a means for controlling the strength within a specific range, it is preferable to change the content ratio of unsaturated carboxylic acid or the like, or mix an ordinary polyolefin resin and change the mixing ratio.

The above-mentioned interlayer adhesive strength needs to be in the range of 50 to 200 gf / 15 mm width, and if it is less than 50 gf / 15 mm width, there is a problem that the gas barrier resin layer 2 peels off during handling of the package, If the width exceeds 200 gf / 15 mm, there is a problem that the layers are difficult to peel off and the lid material is easily wrinkled during peeling.

Further, in the present invention, the above-mentioned maximum breaking strength of the polyolefin resin layer 1 needs to be within a range of 300 to 1500 gf / 15 mm width. If the width of the gas barrier resin layer 2 is less than 300 gf / 15 mm, there is a problem that the polyolefin layer 1 will break when peeling off the gas barrier resin layer 2. If the width exceeds 1500 gf / 15 mm, the polyolefin layer 1 will peel off from the bottom material. There is a problem that it is difficult to do.

Further, in the present invention, it is preferable to stack an unstretched polypropylene resin layer 3 on the outer side of the gas barrier resin layer 2 as shown in FIG. 1. By providing the unstretched polypropylene resin layer 3, heat sealing is performed. At the same time, it is possible to prevent the lid member from adhering to the hot plate, and it is easy to prevent the gas barrier resin layer 2 from tearing during the peeling of the gas barrier resin layer 2. The thickness of the unstretched polypropylene resin layer 3 is preferably in the range of 30 to 80 μm. If it is less than 30 μm, printing on the surface is difficult, and if it exceeds 80 μm, the transparency tends to deteriorate.

[0011]

[Effect of device]

 As described above, the lid material of the present invention has a good balance between gas barrier properties and delamination properties, and can be suitably used as a lid material for packaging raw meat gas packs.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of a lid member of the present invention.

[Explanation of symbols]

 1 polyolefin resin layer 2 gas barrier resin layer 3 unstretched polypropylene resin layer 4 adhesive layer

Claims (2)

[Scope of utility model registration request] 1. A polyolefin resin layer (1) is disposed on the seal side and a gas barrier resin layer (2) is disposed on the outside through an adhesive layer (4) made of an adhesive resin, and the polyolefin resin layer (1) and the gas barrier are disposed. The interlayer adhesion strength of the resin layer (2) is in the range of 50 to 200 gf / 15 mm width, and the maximum breaking strength of the polyolefin resin layer (1) is 300 to 1500 g.
Lid material for packing gas packs of raw meat, characterized in that the width is f / 15 mm. 2. The non-stretched polypropylene resin layer (3) is laminated on the outside of the gas barrier resin layer (2).
A lid material for packaging a raw meat gas pack as described.