It can be divided into many types according to different standards . General classification is based on the application of the sub, plastic film mainly used in the fields of: Food, medicine, chemical industry and other fields, among which the food packaging accounted for the largest proportion, for example, the beverage packaging, frozen food packaging, cooking food packaging, fast food packaging, these food is the fast moving consumer goods in our life, so the demand for plastic film is relatively large. Generally it can be divided into 7 kinds: Polyester film, nylon film, aluminium plating film, high resistance diaphragm, biaxially oriented polypropylene film, low density polyethylene film, cast polypropylene film.
Types of plastic film 1, PVA coated high barrier film PVA coated high barrier film is adding nano inorganic matter PVA coated polyethylene film after the printing, composite, in slightly increase the cost of the premise, the barrier properties not only was obviously better than that of the EVOH five layer co extrusion film, and the packaging cost greatly decreased, which can not only ensure that packaging of aseptic packaging all the quality requirements, and greatly reduces the cost of aseptic packaging of food processing enterprises, can be used for packing drinks, juice, milk, soy sauce, vinegar, etc.. 2, biaxially oriented polypropylene film (BOPP) biaxially oriented polypropylene film is made of polypropylene particles by CO extrusion forming sheets, followed by stretching in both horizontal and vertical direction . Due to the stretching molecular orientation, the physical stability of the film, mechanical strength and tightness are better, transparency and gloss, high toughness wear-resisting is currently the most widely used printing film, the general use of thickness of 20 ~ 40 m, the most widely used for 20 m. Biaxially oriented polypropylene film's main drawback is poor heat sealing property, so the general use of the outer film composite films, such as with polyethylene film composite moisture resistance, transparency, strength, stiffness and printing are ideal for to contain dry food. Because the surface of the biaxially oriented polypropylene film is nonpolar, high crystallinity, free surface low. Therefore, the printing performance is poor, poor adhesion of inks and adhesives, in printing and laminating before surface treatment.
