PVDC laminated composite high-temp-resistant steamed and boiled food packaging film and its preparation method

Abstract

The present invention relates to a PVDC laminated composite high-temp.-resistant cooked food packaging film and its preparation method. Its intermediate layer PVDC (chlorovinylidene and vinyl chloride copolymer) is respectively connected with two layers of two sides by means of binder, the described binder is a double-component polyurethane type solvent-free binder. The product can be produced by adopting said double-component polyurethane type solvent-free binder combination process and utilizing solvent-free combining machine. Said invented packaging film can meet the requirements for cooking above 121 deg.C.

Description

technical field [0001] The invention relates to a food packaging film, in particular to a PVDC laminated composite high temperature resistant cooking food packaging film, and also relates to a method for preparing the PVDC laminated composite high temperature resistant cooking food packaging film. Background technique [0002] Meat food is an important way for humans to absorb protein, fat, and minerals, accounting for more than 30% of human food consumption expenditures. Therefore, the meat food industry occupies an important position in the food industry. The meat food industry includes slaughtering, refrigeration, various In the processing of meat products, except for a few varieties and some places where people eat raw meat, most meat processing techniques can be divided into pasteurization under normal pressure (80-85°C) and high-temperature sterilization under high pressure (above 121°C). The purpose of pasteurization under normal pressure is to kill the enzymes and vi...

AI Technical Summary

Problems solved by technology

[0010] At present, in the field of domestic flexible packaging, only laminated composite films with aluminum foil as the middle layer can meet this requirement. Its structure is biaxially oriented polyester film / adhesive / lead foil / adhesive / cast polypropylene film, The aluminum foil composite film has a beautiful appearance, high barrier rate, and can withstand high-temperature cooking above 121°C, but has the following disadvantages: first, the aluminum foil is easily broken and cracked by wrinkles, and the barrier property is lost; second, it is opaque, and consumers cannot see the inside. The packaging is inconvenient for customers to buy; the third is that the softness is not enough, and it cannot be tightly attached to the packaged items, and there is a lot of residual air in the bag, which is not conducive to freshness; the fourth is that microwave heating cannot be used; fifth, the cost is relatively high

The above-mentioned composite film is produced by multi-layer co-extrusion compound method. Due to the large number of layers, the multi-layer co-extrusion compound equipment is complicated, the investment is large, the product cost is high, and it is not easy to popularize and apply.

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