143 results about "Biaxial tension" patented technology

A heat-sealing type two-way stretching polypropylene film is prepared by forming a heat-sealing layer with a heat-sealing strength on the surface layer of the two-way stretching polypropylene film by a co-extrusion process. The heat-sealing layer can be formed above or below the two-way stretching polypropylene film, or formed on both the upper and the lower surfaces of two-way stretching polypropylene film at the same time. The adopted heat-sealing material comprises mixing materials of heat-sealing type materials like biopolymer polypropylene or terpolymer polypropylene, propylene-butylene copolymer or known alkene copolymer and the like; heat-sealing materials like 3% to 60% of propylene butylene copolymer or known alkene copolymer and the like, or elastic body, 40% to 97% of homopolymerization polypropylene, and 1% to 20% of an anti-static agent are added to a core layer. The interface heat-seal package or the couple-seal package can be directly performed to the product without being compounded with the PE or CPP heat-sealing film; the surface of the product can be printed and coated, or coated after being printed according to the operating requirements; the product integrates package and decoration as a whole, and can replace partial composite products. The product has the remarkable advantage of low cost, and reduces the environmental pollution.