Food packaging food packaging with PVDC sheet with PVC / PVDC composite hard pieces in food packaging PVC hard piece for the substrate coated with the end of plastic, after dried, and then drying the surface coating PVDC emulsion. percent. Food packaging PVC rigid sheet is based on the health level PVC resin as the main raw material, add appropriate, non-toxic excipients plastics mixing, kneading, rolling, cooling, molding and other processing. PVC rigid sheet with high tensile strength, impact resistance, corrosion resistance, good transparency, excellent secondary processing performance. Polyvinylidene chloride (PVDC) emulsion was prepared by the polymerization of vinylidene chloride and acrylic acid esters, a coating on the surface of various substrates, thereby forming a PVDC film. The PVDC film has the following characteristics: a low permeability, high barrier; 2. Thermal shrinkage; 3. Chemical stability; excellent printing performance; 5 good heat sealability; 6. certain brittle; PVDC emulsion-coated PVC rigid sheet, combined with the formation of the PVC / PVDC composite sheet, only to retain the advantages of a single material, while to overcome the shortcomings of the two single material, and thus better performance, applications more widely. Lower oxygen permeability of after due coated PVDC 1,000 times, water permeability was reduced by more than three times, and therefore, PVC / PVDC laminated rigid sheet is mainly used for solid pharmaceuticals, food packaging, moisture absorption and oxidation of the reduced package items role; especially when used for packaging food, color, smell and taste of the food were excellent protective effect, improve the shelf life of food Paul Hong, preservation; Thus, food packaging PVC / PVDC composite hard The film is the ideal choice for food packaging materials.