JPH0760922A - Transparent anti-fogging lid material - Google Patents

Abstract

PURPOSE:To obtain a lid material excellent in gas barrier properties anti-fogging properties and see-through by laminating a polyvinyl alcohol film becoming an outer surface layer to a polyolefinic film becoming an inner surface layer and to improve the see-through or preservability of an object to be packed. CONSTITUTION:The transparent anti-fogging lid material applied to the opening part of a container is constituted by laminating a polyvinyl alcohol film becoming an outer surface layer and an anti-fogging polyolefinic film becoming an inner surface layer. For example, a laminated film 12 consisting of an ethylene/ vinyl alcohol copolymer and non-stretched polypropylene is extruded to be laminated to a foamed polystyrene sheet 11 to obtain a container material which is, in turn, subjected to vaccum forming so that the laminated film 12 becomes an inner surface to form a barrier container 13. For example, a biaxially stretched polyvinyl alcohol film 14 with a thickness of 12mum and an anti-fogging non-stretched polypropylene film 15 with a thickness of 20mum are laminated through an adhesive layer 16 by a dry laminator to form a transparent anti-fogging lid material 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent antifogging lid material, and more particularly to a transparent antifogging lid material suitable for use as a lid material for a container for packaging refrigerated / frozen foods.

[0002]

2. Description of the Related Art Generally, as a packing form of meat, meat products, seafood, and other refrigerated / frozen foods, for example, a container formed of expanded polystyrene sheet is filled with the above-mentioned various products and a stretch film ( Wrap film) is often used by overlapping packaging. In this case, a stretch film alone is usually used as the lid material, but since this stretch film alone has anti-fogging property, it is excellent both inside and outside the container of the lid material. The anti-fogging effect is obtained, and the filled product can be seen through well.

[0003]

However, since the stretch film has poor gas barrier properties, it has poor storage stability for a long period (6 to 7 days) and has a shell life of 1 to 2.
It was a short day, and there was the inconvenience that the sales area was limited.

On the other hand, it is possible to improve the storability by using a container material and a lid material having a gas barrier property and performing a gas pack packaging in which the air in the container is replaced.
In this case, the usual gas barrier film does not have anti-fogging property, so that water droplets are attached to the inner and outer surfaces of the lid material to impair the transparency of the lid material, or water droplets are attached to the product and thus the commercial value. Was sometimes reduced.

Therefore, the present invention provides a transparent anti-fogging lid material which is excellent in gas barrier property, anti-fogging property and see-through property and which is suitable for use as a lid material for packaging the refrigerated / frozen foods described above. It is an object.

[0006]

In order to achieve the above-mentioned object, the transparent antifogging lid material of the present invention is a transparent antifogging lid material which is adhered to the opening of a container and serves as an outer surface layer. It is characterized by laminating a polyvinyl alcohol film and an antifogging polyolefin film serving as an inner surface layer.

The polyvinyl alcohol film serving as the outer surface layer has a gas barrier property and a hydrophilic property. By disposing this polyvinyl alcohol film on the outer surface of the lid of the container, the antifogging property of the outer surface of the lid is improved. Obtainable. As the polyvinyl alcohol film, either unstretched or biaxially stretched can be used. The film thickness of the unstretched polyvinyl alcohol film is sufficient in view of sufficient antifogging property, strength, cost and the like. The range of 20 to 50 μm is preferable, and the range of 12 to 25 μm is preferable in the case of a biaxially stretched polyvinyl alcohol film.

On the other hand, the antifogging polyolefin type film as the inner surface layer has been widely used as a stretch film or a wrap film from the past, and although it has a poor gas barrier property, it has a sufficient antifogging property. At the same time, it is excellent in heat sealability with container materials widely used as gas pack containers. Therefore, by arranging this antifogging polyolefin film on the inner surface of the lid of the container, the inner surface of the lid can be antifogging and heat sealing with the opening edge of the container can be surely performed.

As the above-mentioned anti-fog polyolefin film, polyethylene or polypropylene similar to the conventional one can be used, but in view of transparency and heat sealability, unstretched polypropylene is preferably used. Further, the film thickness is preferably in the range of 20 to 50 μm from the viewpoint of strength, heat sealability, etc., and in order to secure sufficient transparency, the 45-90 ° eccentric haze value is 3
% Or less is preferably used. In order to provide antifogging property, diglycerin monooleate, diglycerin monolaurate, sorbitan monolaurate or an antifog agent obtained by blending these with polyoxyethylene alkyl ether, polyethylene glycol monooleate or sorbitan trioleate is added to polyolefin. It is preferable to add 0.5 to 5% by weight. Further, in order to further improve the antifogging property of the inner surface of the lid, an anionic emulsion type coating type surface modifier can be applied to the inner surface side of the container of the antifogging polyolefin film.

The above-mentioned two films can be laminated by any method, but can be easily carried out by using an adhesive such as an adhesive for retort.

[0011]

EXAMPLES Examples of the present invention will be described below. Example 1 As shown in FIG. 1, an ethylene vinyl alcohol copolymer (manufactured by Kuraray Co., Ltd.) previously laminated on a 0.14 mm expanded polystyrene sheet (manufactured by Mitsubishi Yuka Badish) 11.
E-EF 15 μm) and a non-stretched polypropylene (Tohcello GHC 20 μm) laminated film 12 is extruded and laminated via an adhesive resin to form a container material,
A barrier container 13 having an inner capacity of 500 g was prepared by vacuum forming at a temperature at which secondary foaming did not occur with the laminated film side facing the inner surface of the container. On the other hand, a 12 μm biaxially stretched polyvinyl alcohol film (Boblon EX manufactured by Nigo Film Co., Ltd.) 14 and a 20 μm anti-fog non-stretched polypropylene film 15 are laminated with a dry laminator via an adhesive layer 16 to provide a transparent anti-fog property. The lid member 17 was created.

Then, 500 g of frozen raw meat is filled in the barrier container 13 and a gas filling packaging machine (manufactured by Nishihara Seisakusho)
Then, the air in the container was replaced with a mixed gas of carbon dioxide gas / oxygen, and the unstretched polypropylene film 15 of the transparent antifogging lid member 17 was sealed toward the inner surface of the container. Next, the produced gas pack product was frozen and stored in an atmosphere of -30 to -35 ° C, and then transferred to a refrigerated showcase at 5 to 10 ° C. It was good.

Example 2 As shown in FIG. 2, a 12 μm biaxially stretched polyvinyl alcohol film (Boblon EX manufactured by Nigo Film) 21
And an anionic emulsion type coating-type surface modifier (Rikenal S-3, manufactured by Riken Vitamin) on one surface (non-lamination side) of the 20 μm unstretched polypropylene film 22.
3 was applied as a 5% aqueous solution by a gravure roll and was bonded with a dry laminator via the adhesive layer 24 to form a transparent anti-fog lid 25.

Then, as in Example 1, frozen raw meat 50
The gas pack container 26 filled with 0 g was sealed.
Next, the produced gas pack product was frozen and stored in an atmosphere of -30 to -40 ° C and then transferred to a refrigerated showcase at 5 to 10 ° C. It was good.

Example 3 A gas pack container was manufactured in the same manner as in Example 2, except that an unstretched polyvinyl alcohol film (Vinylon manufactured by Nigo Film) was used in place of the biaxially stretched polyvinyl alcohol film. The produced gas pack product was similarly frozen and stored in an atmosphere of -30 to -40 ° C and then transferred to a refrigerated showcase at 5 to 10 ° C. However, no water droplets were attached to the inside or outside of the lid, and the transparency of the contents was seen. Was also good.

Table 1 shows the eccentric haze values of the transparent antifogging lid material prepared in Examples 2 and 3 and a general polyvinyl chloride wrap film (DIALAP made by Mitsubishi resin). The haze value was measured using a digital haze meter NDH-2D manufactured by Nippon Denshoku Industries Co., Ltd.

[0017]

[Table 1]

As shown in Table 1, Example 2 and Example 3
In addition, even when the product was viewed obliquely, sufficient transparency was obtained for practical use.

[0019]

As described above, the transparent antifogging lid material of the present invention comprises a polyvinyl alcohol film having gas barrier properties and antifogging properties, and a polyolefin film having antifogging properties and heat sealing properties. Since they are laminated, it is possible to obtain a lid member having gas barrier properties and excellent anti-fogging properties and transparency. Therefore, by combining the lid member of the present invention with a container having a gas barrier property, it is possible to improve the storability of foods and the like without impairing the see-through property of the packaged product and to attach water drops to the product. It will not reduce the value.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a gas pack product manufactured in Example 1.

FIG. 2 is a cross-sectional view of a gas pack product manufactured in Example 2.

[Explanation of symbols]

13 ... Barrier container, 14 ... Biaxially stretched polyvinyl alcohol film, 15 ... Unstretched polypropylene film,
17: Transparent anti-fog lid material

Claims (5)

[Claims] 1. A transparent antifogging lid material applied to the opening of a container, which comprises a polyvinyl alcohol film as an outer surface layer and an antifogging polyolefin film as an inner surface layer laminated together. Characteristic transparent anti-fog lid material. 2. The transparent anti-fog film according to claim 1, wherein the polyvinyl alcohol film serving as the outer surface layer is a non-stretched polyvinyl alcohol film having a thickness of 20 to 50 μm or a biaxially stretched polyvinyl alcohol film having a thickness of 12 to 25 μm. Sex lid material. 3. The transparent antifogging lid material according to claim 1, wherein the antifogging polyolefin film as the inner surface layer has a thickness of 20 to 50 μm. 4. The transparent anti-fogging lid material according to claim 1, wherein the anti-fogging polyolefin film as the inner surface layer has a 45-90 ° bending angle haze value of 3% or less. 5. The antifogging polyolefin film as the inner surface layer has an anion emulsion type coating type surface modifier applied to the inner surface of the container. Transparent anti-fog lid material.