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 comprises a substrate film layer with a plurality of micro gap structure areas generated by a rolling process; a sealing adhesive tape for covering the broad width of the micro gap structure areas of the substrate film layer, wherein an adhesion layer is coated on part area of one side of the compound film layer on the sealing adhesive tape, and a tearing layer with a section of non-adhesive area is retained at the two side circumference thereof, the adhesion layer is correspondingly jointed and covered on the surface of the micro gap structure areas of the substrate film layer. The compound film is especially applied to food package box or bag, after the food is contained and sealed, the food can be directly closed or freezed or chilled; when cooking, the sealing adhesive tape can firstly be torn which is convenient for reuse or, the package device containing the freezed or chilled food is directly put in a microwave oven for heat. The compound film has function of automatically regulating the high temperature and high steam pressure so as to prevent the explosion of the package device 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

Images