Biaxially oriented polypropylene hot-pressing film and its making process

Abstract

The invention discloses a biaxially oriented polypropylene hot-pressing film, which is made by three-layer co-extrusion and biaxial stretching. The middle layer is a homo-polypropylene core layer, the inner surface layer is a hot pressing layer, and the external surface layer is a printing layer. The homo-polypropylene core layer comprises 2%wt of an antistatic agent and 98%wt of homo-polypropylene. The hot pressing layer comprises 70%-80%wt of a thermal adhesive masterbatch, 2%-5%wt of an anti-adhesion agent and 15%-28%wt of an ethylene-propylene-butene copolymer. The printing layer comprises 3%wt of the anti-adhesion agent and 97%wt of homo-polypropylene. The invention also provides a production method of the biaxially oriented polypropylene hot-pressing film. The biaxially oriented polypropylene hot-pressing film provided in the invention can achieve good printing effects of conventional biaxially oriented polypropylene films, gluing is not needed during paper-plastic lamination, and hot-pressing lamination can be carried out directly. The bonding strength of the coated film completely meets the use requirements. Downstream processing procedures are greatly simplified, and the use cost is substantially reduced. Organic solvent evaporation and residual are absent in the production process, so that the process is green and environment-friendly.

Description

technical field [0001] The invention relates to a biaxially stretched polypropylene hot-pressed film and a manufacturing process thereof, and more specifically relates to a biaxially stretched polypropylene film with the function of direct hot-pressing composite for paper-plastic composite packaging. Background technique [0002] The paper-plastic composite technology in the prior art is glue coating compound and pre-coating process, wherein the glue coating process is divided into solvent-based and water-based glue-coating processes, and the ordinary biaxially oriented polypropylene film needs to be glued and baked for downstream use. Dry process to make a pre-coated film, and then compound the above-mentioned pre-coated film with paper. Solvent-based gluing will produce a large amount of toxic volatiles, pollute the air, and at the same time cause poison to operators. Although water-based gluing does not have this problem, However, more energy will be consumed during the d...

AI Technical Summary

Problems solved by technology

[0002] The paper-plastic composite technology in the prior art is glue coating compound and pre-coating process, wherein the glue coating process is divided into solvent-based and water-based glue-coating processes, and the ordinary biaxially oriented polypropylene film needs to be glued and baked for downstream use. Dry process to make a pre-coated film, and then compound the above-mentioned pre-coated film with paper. Solvent-based gluing will produce a large amount of toxic volatiles, pollute the air, and at the same time cause poison to operators. Although water-based gluing does not have this problem, However, more energy will be consumed during the drying process. On the other hand, the volatilization rate of water is much slower than that of organic solvents, which limits the speed of the production line; the pre-coating process is to pre-coat a layer of EVA hot melt adhesive on the film. Then heat-melt compound with paper, although it solves the problem in the gluing process well, but the pre-coating process needs to invest in additional pre-coating equipment, which increases energy consumption and cost, and the equipment investment occupies a large area