JPH0760906A - Double-sided anti-fog lid material - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a double-sided anti-fog lidding material that is excellent in gas barrier properties, anti-foging properties, and see-through properties, and is particularly suitable for use as a lidding material for packaging refrigerated and frozen foods. . [Structure] A cellophane film 11 is laminated on the outer surface side of the lid of a film or sheet 12 made of unstretched polypropylene or low density polyethylene, and a soft polyolefin film 13 having antifogging property is laminated on the inner surface side of the lid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided antifogging lid material, and more particularly to a double-sided 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. Further, an antifogging agent can be kneaded into the resin, but the transparency of the film is significantly lowered.

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 double-sided anti-fog lidding material of the present invention is a double-sided anti-fog lidding material to be attached to the opening of a container, which is made of unstretched polypropylene or It is characterized in that a cellophane film is laminated on the outer surface side of the lid of a film or sheet made of low density polyethylene, and a soft polyolefin film having an antifogging property is laminated on the inner surface side of the lid.

In the double-sided antifogging lid, the film or sheet made of the unstretched polypropylene or low-density polyethylene serves as an intermediate layer of the lid to obtain the strength required as the lid, The thickness is appropriately in the range of 10 to 100 μm, preferably 15 to 60 μm from the viewpoint of strength and cost.

The cellophane film provided on the outer surface side of the lid of the film or sheet made of unstretched polypropylene or low density polyethylene has gas barrier properties and hydrophilicity. The cellophane film is provided on the outer surface of the lid of the container. By disposing the cover on the outer surface, it is possible to obtain the antifogging property of the outer surface of the lid. The thickness of this cellophane film is 10 to 50 μ from the viewpoint of antifogging property, cost, etc.
m, preferably 12 to 20 μm.

On the other hand, the anti-fogging soft polyolefin film provided on the opposite surface of the cellophane film has been widely used as a stretch film or a wrap film, and has a poor gas barrier property. In addition to having sufficient anti-fogging property, it has excellent heat sealability with container materials widely used as gas pack containers. Therefore, by disposing this anti-fog polyolefin film on the inner surface of the lid of the container, the anti-fog property of the inner surface of the lid can be obtained, 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 is used, and diglycerin monooleate, diglycerin monolaurate, sorbitan monolaurate or polyoxyethylene alkyl ether, polyethylene An antifogging agent obtained by blending glycol monooleate and sorbitan triolate can be added, and the film thickness is 10 to 30 from the viewpoint of antifogging property, heat sealing property and the like.
A range of μm, preferably 15 to 20 μm is suitable.

The above-mentioned sheets or films can be laminated by any method, for example, corona treatment is applied to at least one of the respective lamination surfaces to laminate adhesion (corona treatment lamination), or an adhesive is used. By doing so, it can be easily performed.

As the adhesive, it is preferable to use a retort adhesive in consideration of hygiene problems. As the adhesive for retort, various types such as ether type, ester type, urethane type, urethane ester type, and polymer ester type can be used, but those that have water resistance and high hardness after curing should be used. Is desirable.

In the double-sided antifogging lid material of the present invention, the biaxially stretched polyester or biaxially stretched polypropylene and unstretched polypropylene or It is also possible to use a film or sheet in which low density polyethylene or ethylene vinyl acetate copolymer is laminated. That is, as the intermediate layer, a laminate of biaxially oriented polyester and non-oriented polypropylene, a laminate of biaxially oriented polyester and low density polyethylene, a laminate of biaxially oriented polyester and ethylene vinyl acetate copolymer,
Alternatively, a laminate of biaxially oriented polypropylene and non-oriented polypropylene, a laminate of biaxially oriented polypropylene and low density polyethylene, and a laminate of biaxially oriented polypropylene and ethylene vinyl acetate copolymer can be used.

As the above-mentioned biaxially oriented polyester, for example, polyethylene terephthalate can be used. The thickness of the biaxially oriented polyester or the biaxially oriented polypropylene is 10 to 1 in terms of strength, cost, etc., similarly to the above.
A range of 00 μm, preferably 12 to 30 μm is suitable.

The thickness of the unstretched polypropylene, low density polyethylene, ethylene vinyl acetate copolymer is also
Similarly to the above, 10 to 100 μm, preferably 15 to 60
A range of μm is suitable.

When the above-mentioned laminated film or sheet is used as the intermediate layer, the above-mentioned cellophane film is laminated on the biaxially stretched polyester or biaxially stretched polypropylene side, and the anti-fog soft polyolefin film is unstretched polypropylene or low stretched polypropylene. It is laminated on the pressure-bonded side of the density polyethylene or ethylene vinyl acetate copolymer. Lamination of each film or sheet can be performed by any method, but usually,
Between the laminate of the intermediate layer and the cellophane film of the intermediate layer and the outer surface layer, by dry lamination using an adhesive, respectively, the intermediate layer and the polyolefin film of the inner surface layer, by coating or pressure bonding, respectively Good.

Since the biaxially stretched polyester or the biaxially stretched polypropylene in the above laminate has high rigidity, the cellophane film is prevented from waviness due to moisture absorption, and the unstretched polypropylene, low density polyethylene or ethylene vinyl acetate copolymer is used as an intermediate layer. And has the effect of improving the adhesiveness between the anti-fog soft polyolefin film.

Further, the antifogging property on the outer surface side is further improved,
In order to prevent the generation of traces of water droplets, the surface of the cellophane film on the outer surface side may be coated with a polymer antifog agent. This polymer-based antifogging agent has a hydrophilic group at the end of the molecular chain, which is different from ordinary relatively low-molecular-weight surfactants, which enhances the adhesiveness to the cellophane film and prevents peeling. It hardly occurs, and excellent antifogging property can be maintained for a long period of time.

[0019]

EXAMPLES Examples and comparative examples of the present invention will be described below. Example 1 As shown in FIG. 1, a 14 μm cellophane film (manufactured by Nimura Chemical Co., Ltd.) 11, a 20 μm unstretched polypropylene film (Toyobo Co., Ltd. pyrene film CT) 12, and an anti-fog soft polyolefin film (Mitsubishi resin diamond). A gas pack product was produced in which a container 15 was sealed with a double-sided antifogging lid material 14 composed of Wrap A) 13.

The gas pack product is manufactured by using a gas filling packaging machine (TGP packaging machine manufactured by Nishihara Seisakusho Co., Ltd.) 16 shown in FIG. 2 and a laminated film 17 in which a cellophane film 11 and a polypropylene film 12 are previously corona-treated and laminated. , The polyolefin film 13 is fed from another winding shaft, and the rubber roll 16a and the metal roll 16
Immediately after pressure-bonding at b, it was fed out onto the container, and the polyolefin film 13 was placed on the container side and heat-sealed. In addition, reference numeral 18 in the drawing denotes a container sheet.

The above-mentioned gas-packed product filled with raw meat was clouded inside and outside the lid and no water droplets adhered to it during packaging, distribution and display. The transparency of the contents was also good.

Comparative Example 1 Raw meat was prepared from the outside by using a lid material having a structure of an antifogging agent (normal surfactant) / polyvinylidene chloride coated polyethylene terephthalate / polyethylene / antifog agent kneaded linear low density polyethylene. The filled container was sealed, but the transparency of the lid material itself was poor, and fogging occurred on the inner surface side in about 1 hour. Further, when the surface of the film was rubbed by hand, the antifogging effect on the surface was significantly reduced.

Example 2 As shown in FIG. 3, in Example 1, the cellophane film 11 and the polypropylene film 12 were bonded together with an adhesive (Takelac A-385 / Takenate A- manufactured by Takeda Pharmaceutical Co., Ltd.).
50) A lid member 14 composed of a cellophane film 11, a polypropylene film 12, and a soft polyolefin film 13 was prepared in the same manner as above except that it was dry laminated through 21.

The gas pack product using the obtained lid material does not show fog on the inside or outside of the lid or adhesion of water droplets during packaging, distribution, or display, as in the case of Example 1. The sex was also good.

Example 3 As shown in FIG. 4, a cellophane film of 14 μm (same as in Example 1) 31 and a biaxially oriented polypropylene film of 15 μm (Pyrene film OT manufactured by Toyobo) 32
And a 20 μm unstretched polypropylene film (same as in Example 1) 33 and an anti-fog soft polyolefin film (same as in Example 1) 34 were laminated to form a double-sided anti-fog cover 35. The cellophane film 31, the biaxially stretched polypropylene film 32, and the non-stretched polypropylene film 33 are laminated by dry lamination via an adhesive (same as in Example 2) 36, and the non-stretched polypropylene film 33 and the soft polyolefin film 34 are laminated. Lamination was performed by pressure bonding.

A container filled with raw meat was sealed with the obtained lid material, but during packaging, distribution and display, neither fog nor water droplets adhered to the inside or outside of the lid. The transparency of the contents was also good.

Example 4 As shown in FIG. 5, a laminate comprising the same 14 μm cellophane film 11 as in Example 1, a 20 μm unstretched polypropylene film 12, and an anti-fog soft polyolefin film 13 was prepared. The surface of the cellophane film 11 was coated with a polymer-based antifogging agent (Silwet manufactured by Nippon Unicar) 41 to prepare a double-sided antifogging lid material.

The obtained lid member was prepared in the same manner as in each of the above-mentioned Examples.
The inside and outside of the lid did not fog or adhere to water drops, and the transparency was good. Furthermore, the appearance did not change even if water droplets were attached to the surface of the lid material.

Example 5 As shown in FIG. 6, the surface of the cellophane film 11 of the laminate having the same structure as in Example 2 was coated with the antifogging agent 41 used in Example 4. The obtained lid material did not cause fog inside or outside the lid or adhesion of water droplets, had good transparency, and had no change in appearance even when water droplets adhered to the surface of the lid material, as in the above-mentioned Examples. .

Example 6 As shown in FIG. 7, the surface of the cellophane film 31 of the laminate having the same structure as in Example 3 was coated with the antifogging agent 41 used in Example 4. The obtained lid material does not cause fog inside or outside the lid or adhesion of water droplets and has good transparency as in the above-mentioned respective examples, and even if water droplets adhere to the surface of the lid material, water droplet traces do not occur. It was

[0031]

As described above, the double-sided antifogging lid material of the present invention comprises a cellophane film having gas barrier properties and antifogging properties on both sides of an intermediate layer made of unstretched polypropylene or low density polyethylene, Since the polyolefin film having antifogging property and heat sealing property is laminated, it is possible to obtain a lid member having sufficient strength, gas barrier property and excellent antifogging property and see-through property. 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 schematic diagram of a gas filling and packaging machine used in Examples.

FIG. 3 is a cross-sectional view of a lid member manufactured in Example 2.

FIG. 4 is a cross-sectional view of a lid member manufactured in Example 3.

FIG. 5 is a sectional view of a lid member manufactured in Example 4.

FIG. 6 is a cross-sectional view of a lid member manufactured in Example 5.

FIG. 7 is a cross-sectional view of a lid member manufactured in Example 6.

[Explanation of symbols]

11 ... Cellophane film, 12 ... Unstretched polypropylene film, 13 ... Soft polyolefin film, 14
... Double-sided anti-fog lid material, 21 ... Adhesive

Claims (3)

[Claims] 1. A double-sided anti-fog lidding material to be attached to the opening of a container, wherein a cellophane film is provided on the outer surface side of the lid or an inner side of the lid of a film or sheet made of unstretched polypropylene or low density polyethylene. A double-sided antifogging lid material, which is formed by laminating a flexible polyolefin film. 2. A double-sided anti-fog lidding material applied to the opening of a container, wherein biaxially stretched polyester or biaxially oriented polypropylene on the outer surface side of the lid and unstretched polypropylene or low density on the inner surface side of the lid. Cellophane film on the biaxially oriented polyester or biaxially oriented polypropylene side of the film or sheet laminated with polyethylene or ethylene vinyl acetate copolymer, on the side of non-oriented polypropylene or low density polyethylene or ethylene vinyl acetate copolymer side A double-sided antifogging lid material, which is formed by laminating an antifog soft polyolefin film. 3. The double-sided antifogging lid material according to claim 1, wherein the cellophane film has a polymer-based antifogging agent coated on the outer surface thereof.