Common several kinds of plastic flexible packaging materials

in recent years, with the rapidly development of market economy, due to the plastic products brought great convenience to people's life, so the plastic packaging products on the market share is more and more big, the composite plastic flexible packaging, in particular, has been widely used in food, medicine, chemical industry and other fields, and as the proportion of food packaging * big, such as beverage packaging, quick-frozen food packing, cooking food, fast food packaging, etc. We know the convenience of plastic flexible packaging, but you really know how raw materials used to make these plastic bags? Here, the simple for you to introduce our daily life we often meet the production of plastic flexible packaging material - Plastic film. 1, the general use of the raw materials of compound plastic flexible packaging products is a two-way stretch polypropylene film, we usually call it BOPP, is made of polypropylene particles after co-extrusion forming sheet, then through vertical and horizontal directions made by stretching. The film's physical stability, mechanical strength, good air tightness, high transparency and gloss, tough wear-resisting, is the * widely used printing film, generally use thickness of 20 ~ 40 & mu; M, * widely used for 20 & mu; m。 2, cast polypropylene film ( Usually what we call the CPP) , it USES the cast process, can be divided into ordinary CPP and CPP two level cooking, excellent transparency, uniform thickness, and the performance of the lateral uniform, generally used as the lining of the composite film material. Cooking level of CPP film thickness in 60 ~ 80 & mu; M between, can withstand temperatures up to 121 ℃, 30 min cooking, oil resistance, good air tightness and heat sealing strength is high, the general meat packaging inner cooking level adopts the CPP film. Common CPP film thickness in 25 to 50 & mu; M, and after the OPP composite has good transparency, surface light, feel is strong, gift bags are commonly used this kind of material. The film also has good heat sealing. 3, polyester film ( We usually call it PET) , based on polyethylene terephthalate as raw material, adopting legal system into thick slices, then through two-way stretch film material. It is a colorless, transparent, glossy film, good mechanical properties, high rigidity, hardness and toughness, durability, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, good air tightness and sweet, is one of the permeability resistance of composite film base material. But the polyester film price is higher, the general thickness of 12 & mu; M, the outer layer of the commonly used for cooking and packaging materials, printing sex is good. 4, aluminum plating film ( The polyester aluminum with CPP aluminum plating film) , it has both the characteristic of plastic film, but also has the characteristics of metal. The role of the aluminum plating thin film surface is shading, prevent ultraviolet irradiation, extend the shelf life of the contents, and improve the brightness of the film, from a certain extent, instead of the aluminum foil, also has a low price, beautiful and good barrier properties, therefore, aluminum plating film and they are widely used in the composite packaging is mainly used in dry biscuit, puffed food packaging and on some medicine and cosmetics packaging. 5, nylon film ( What we call the PA) Hard goods, suitable for packing, such as sex fat food, meat, Fried food, vacuum packing food, cooking food, etc. Nylon film is a kind of very tough film, good transparency, and has good gloss, high tensile strength, tensile strength, but also has good heat resistance, cold resistance, oil resistance and organic solvent resistance, abrasion resistance, durable sex good, and is soft, good resistance of oxygen resistance, but for poor water vapor barrier property, moisture absorption, moisture permeability, poor heat sealing property. 6, low density polyethylene film ( The LDPE) , usually two kinds of technology made by blow molding and flow. Stretch film polyethylene film thickness uniformity, but because the price is higher, rarely used. Blow molding polyethylene film is made by blow molding grade PE particles by blow molding machine blowing, lower cost, so * is widely applied. Low density polyethylene film is a translucent, luster, texture is soft membrane, it has excellent chemical stability, heat sealing, water resistance and moisture resistance, freezing resistance, can be boiled. Its main drawback is that of oxygen barrier property is bad, often used in the inner membrane of composite flexible packaging material, but also the * widely, * big dosage of a plastic flexible packaging film, more than about 40% of plastic packaging film consumption. Because of the polyethylene molecules that do not contain polar groups, and high crystallinity, surface free energy is low, therefore, the film printing performance is poorer, to the poor adhesion of inks and adhesives, so the need for surface treatment before printing and composite.

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