Composite film for hermetic food heating automatic pressure-regulation packaging device and manufacture method thereof

Abstract

The invention discloses a compound film used for an air-tight food-heating automatic pressure-regulating packing apparatus and a corresponding manufacturing method. The compound film is formed by a base film which is provided with a plurality of microcosmic clearance structure zones and on which an adhesive layer of an adhesive tape is coated to form a plurality of microcosmic clearance structure zones. The invention is especially used for various food packing boxes and bags, and after being packed and sealed, the food can be directly frozen in a sealed manner; when the food is to be cooked, the adhesive tape can be torn for a repeated use or the package containing the frozen food is directly put into a micro-wave oven for heating and the compound film is provided with the function of automatically regulating the high temperature and high steam pressure so as to prevent the explosion of the package in the heating process.

Description

technical field [0001] The invention relates to an airtight composite film for food heating and automatic pressure-regulating packaging device and its manufacturing method. During the heating process, the high-temperature circulating steam is partially regulated to ensure that the box or bag of the packaged food is prevented from breaking, and the high-temperature steam is not lost in large quantities to maintain the delicious food. The packaging device has an automatic pressure-regulating composite film. Background technique [0002] Since ancient times, food cooking has mostly been carried out by fire roasting, high-temperature boiling or steaming, and the use of energy-efficient microwaves to heat or cook food has a history of more than 50 years. Among them, countries with a higher degree of industrialization have a higher rate of using microwave ovens to cook and heat food in general families, schools, restaurants or other public places under the requirements of convenie...

AI Technical Summary

Problems solved by technology

[0015] Therefore, the industry continues to develop and produce traditional food packaging bags or boxes that are prone to explosion, and has introduced a variety of food packaging boxes or bags with air permeability to adapt to packaging frozen and refrigerated food for microwave heating. It is necessary to open the film layer separately; however, the effective shelf life of food in this gas-permeable food packaging box or bag is short, and it is usually impossible to carry out vacuum packaging or fill it with carbon dioxide (carbon dioxide, CO 2 ), nitrogen (N 2 ) and other inert gases to change the packaging environment (modified atmosphere packaging, MAP) to prolong the shelf life of food; even, during long-term frozen storage, it is easy to cause albinism and frostbite (iceburn) due to the gradual volatilization and drying of food moisture

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