Food packaging film

Abstract

In the present invention, there is provided a food packaging film which is excellent in workability, processability, productivity, gas barrier properties, low-temperature heat sealing properties, safety and mechanical strengths, which can be used as an alternative film to generally used cellophane / wax films, and can be suitably used as a packaging film for melting cheese. The food packaging film according to the present invention comprises at least five layers of a heat seal layer / an adhesive layer / a gas barrier layer / an adhesive layer / a heat seal layer, which heat seal layer comprises an olefin-based resin and melts at not lower than 60° C. and lower than 90° C.

Description

[0001]This application is a divisional of application Ser. No. 12 / 740,151 filed Jul. 29, 2010, which in turn is the U.S. national phase of International Application No. PCT / JP2007 / 001179, filed 29 Oct. 2007, the entire content of which is hereby incorporated by reference in this application.TECHNICAL FIELD[0002]The present invention relates to a food packaging film. More specifically, the present invention relates to a food packaging film which is excellent in workability, processability, productivity, gas barrier properties, low-temperature heat sealing properties, safety and mechanical strengths, can be used as an alternative film to generally used cellophane / wax films, and can be suitably used as a packaging film for melting cheese.BACKGROUND ART[0003]When producing processed cheese, a cellophane / wax film which is a sheet film and produced by coating the wax onto the surface of cellophane (for example “Paraseal” (registered trademark) manufactured by NIKKAN INDUSTRIES Co., Ltd.) ...

AI Technical Summary

Benefits of technology

The film provides excellent workability, processability, gas barrier properties, and mechanical strength, enabling air-tight packaging of melted foods without additional heat-sealing operations, while reducing costs associated with coating and printing steps.

Problems solved by technology

Although the above cellophane / wax film has an advantage that the sealing can be made by the heat and weight of cheese, there are problems that (1) the cellophane / wax film is poor in the mechanical strength so that it is easy to break and foreign matters are got inside thereof; (2) when the melted wax is leaked out from the cellophane / wax film and adhered to the shaping case, it is difficult to take out the block cheese from the shaping case to deteriorate the workability; (3) although the melted wax is not harmful, there is a possibility to remain the wax on the surface of cheese and it is not preferable; and (4) by the relationship between the used cellophane and wax, blue-color printing is impossible so that it is difficult to find any scratches (usually, in food packaging, blue-colored packaging materials are used for preventing any foreign matters from getting inside.

However, since this still uses wax for air-tightening, the above problems (2) and (3) are still not overcome.

However, in this process, any extra film portion is necessary to provide heat sealed portions, and when the heat sealing thereof is not conducted under deaeration, air is remained between the cheese and film so that this leads to getting moldy.

Also, this operation under deaeration is a major hurdle in the workability.

Further, in this process, since any extra film portion such as heat sealed portions is required, there is a possibility that traces and wrinkles caused by the extra film portion are formed on the surface of cheese so that loss of cheese content and deterioration of product value are caused.

Therefore, it is difficult to apply this process to packaging of cheese block.