Manufacture process of ecological laminating composite food-grade BOPP laser membrane

Abstract

The invention discloses a manufacture process of an ecological laminating composite food-grade BOPP laser membrane. The BOPP laser membrane is composed of a laser imaging layer, a laminating layer, a color printing layer and a substrate layer. The manufacture process comprises the following steps: processing a polypropylene material with co-extrusion flat membrane manner two-way stretching production process to obtain the substrate layer; after action of surface tension, performing color printing with special printing ink of food packaging, thereby obtaining a substrate with the color printing layer; mixing polypropylene, high-density polyethylene, polystyrene, bentonite and iron powder, fusing and plasticizing the mixture in an extruder, laminating on the color printing layer of the substrate via a T type mold head to form a substrate with the laminating layer, and processing to obtain a BOPP membrane roll; and unreeling the BOPP membrane roll, coating the whole width or the specific part of the width of the surface of the laminating layer with the laser imaging layer, primarily curing, performing mold pressing, further curing, and reeling to obtain the food-grade BOPP laser membrane with environmental friendliness, low cost and high quality.

Description

technical field [0001] The invention relates to the technical field of plastic film processing, in particular to a manufacturing process of an ecological coating compound food-grade BOPP laser film. Background technique [0002] People pay more and more attention to health, and food hygiene is a major issue for everyone. Food packaging is one of the key measures to ensure food hygiene and extend food shelf life. [0003] At present, domestic food packaging bags use BOPP / PP color packaging film, and food is packaged by automatic packaging machines, accounting for about 70% of all food packaging. It can be seen that the demand for packaging film is huge. However, the processing technology of BOPP / PP color packaging film has always been using BOPP film (biaxially oriented polypropylene film) and PP film (two-layer co-extruded polypropylene blown film), using the traditional dry composite process. Apply an adhesive to the film to be compounded, and then bond it. The adhesive us...

AI Technical Summary

Problems solved by technology

However, the processing technology of BOPP / PP color packaging film has always been using BOPP film (biaxially oriented polypropylene film) and PP film (two-layer co-extruded polypropylene blown film), using the traditional dry composite process. Apply an adhesive to the film to be compounded, and then bond it. The adhesive used contains organic solvents, and such organic solvents often have residual substances after drying, which poses a serious hidden danger to food safety; at the same time, in BOPP In the process of color printing, although the color oil film is dried by heat and the ink film is completely dry, but in the process of automatic machine packaging, the color film will more or less come into contact with food, causing the micromolecules of the oil film to contaminate the food, which will also pose a threat to food safety. serious hidden danger