Plastic film as a substrate material, its history is still relatively short, it is printed as a package through with light and transparent, moisture and oxidation, air tightness, toughness folding, smooth surface, can protect the goods, and goods can be reproduced the shape, color and so on. With the development of petrochemical industry, more and more varieties of plastic film, commonly used plastic films are polyethylene (PE), polyvinyl chloride (PVC), polystyrene, polyester film (PET), polypropylene (PP) and nylon. Different kinds of plastic film properties, different degrees of difficulty printing, as a packaging material is different purposes. Polyethylene film is a colorless, tasteless, odorless, non-toxic translucent insulating material, a large number of bags used for packaging; food bags, can produce a variety of containers. It is an inert material, it is more difficult to print, must be approved treatment, better results can be printed. PVC thin film of light resistance, good aging resistance and has good tear resistance, breathable, is a clean, colorless, transparent film, a plasticizer is typically added, is soluble in acetone, cyclohexanone, and other solvents. Therefore, you can use polyvinyl chloride resin ink. For bags, book covers and so on. Polystyrene film is soft and tough film, clean, colorless and transparent, without plasticizer, the film is always soft, resistant to freezing, storage aging, oxidative polymerization of printing using ink synthetic binders, can imprinted fastness. Mylar is a colorless, transparent, moisture, airtight, soft, high strength, acid oil esters and solvents, are not afraid of high temperature materials, the electric discharge treatment, the surface of the ink has a relatively good fastness. For packaging and composite materials. Polypropylene film has good gloss and a good transparency, heat acid, solvent resistance, abrasion resistance, tear, breathable, heat sealing can not be lower than 160 ?.
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