About several kinds of common plastic flexible packaging materials is introduced
daily life and the use of more convenient packaging products belong to the more extensive use of plastic flexible packaging also more common, general used for packing food, medicine, washing supplies mostly use plastic film to make complete, easy for you to introduce commonly used to make plastic flexible packaging materials.
1, PA ( Nylon) , the nylon membrane 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 and moisture permeability is bigger, poor heat sealing property, suitable for packing hard objects, such as sex fat food, meat, Fried food, vacuum packing food, cooking food, etc.
2, PET polyester film is 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.
3, cast polypropylene film is the flow process production of polypropylene film, and 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. 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. 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.
4, * commonly used belongs to a two-way stretch polypropylene film, it is made of polypropylene particles after co-extrusion forming sheet, then through vertical and horizontal directions made by stretching. Due to stretching molecular orientation, so the film 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。 Two-way stretch polypropylene film main drawback is that poor heat sealing, so generally used as the outer membrane of composite membrane, such as with polyethylene film composite after moisture resistance, transparency, strength, stiffness and printing are ideal, suitable for holding food drying. As a result of the two-way stretch polypropylene film surface for non-polar, high crystallinity, surface free energy is low, therefore, the printing performance is poorer, to the poor adhesion of inks and adhesives, the need for surface treatment before printing and composite.
used to make plastic flexible packaging plastic film has a lot of kinds, is often seen above these, through which two or more than two kinds of printing, composite together, formed the plastic composite film packaging, used for packing food, daily chemical products, etc. , using low cost, strong physical properties.
