Preparation method for package expansion-free sealing cover film of plastic container containing soybean sauce

Abstract

The invention belongs to the field of composite flexible package, and particularly relates to a preparation method for a package expansion-free sealing cover film of a plastic container containing soybean sauce. The preparation method comprises the steps of preparation of a PETG printing film, preparation of a VMPET film, preparation of a cast polypropylene film, dry compounding and the like. Stereo block polypropylene and metallocene polyethylene are added into polypropylene resin for modification, and the special base film, namely the cast polypropylene film, produced through a CPP machine has the advantages of low-temperature heat sealing, easy uncovering, high air impermeability and the like. The package expansion-free sealing cover film prepared through the method is of the structure of a PETG film / a VMPET (vacuum polyester aluminum laminated film) / a CPP(cast polypropylene film) composite film. The composite film can fully generate a high-airtight environment for soybean sauce, so that the soybean sauce is in a good state and is not influenced by the outside.

Description

technical field [0001] The invention relates to the field of composite flexible packaging, in particular to a method for preparing a non-expandable sealing and capping film for a plastic container containing soy sauce. Background technique [0002] At present, with the demand for convenient and simple packaging, there are more easy-to-open cup lid films on the market. The heat-sealing layer used in most lid film products is functional resin (EVA, EMA, etc.). Resin, in many cases, its hygienic performance cannot meet the requirements of the national standard, and from the perspective of processability, this type of resin has relatively high requirements for production equipment and high technical thresholds. [0003] Patent 201020174388.4 discloses an easy-to-remove cup lid film, which has the advantages of meeting the GB9683-88 hygienic standard and low production cost, but because the ink layer is on the surface, when the sealing temperature is higher than 200, if the heat ...

AI Technical Summary

Problems solved by technology

[0002] At present, with the demand for convenient and simple packaging, there are more easy-to-open cup lid films on the market. The heat-sealing layer used in most lid film products is functional resin (EVA, EMA, etc.). Resin, in many cases, its hygienic performance cannot meet the requirements of the national standard, and from the perspective of processability, this type of resin has relatively high requirements for production equipment and high technical thresholds

[0003] Patent 201020174388.4 discloses an easy-to-remove cup lid film, which has the advantages of meeting the GB9683-88 hygienic standard and low production cost, but because the ink layer is on the surface, when the sealing temperature is higher than 200, if the heat resistance of the ink layer is not enough, It may cause the problem of ink layer peeling off during heat sealing

[0004] When packaging the soy sauce-containing container, in addition to the above-mentioned problems of the prior art cover film, considering that the soy sauce itself produces reaction gas, if it cannot be discharged, the soy sauce cover film will bulge, affecting the freshness of the soy sauce.