What Is the Thin Film Process?

Films made of polyvinyl chloride, polyethylene, polypropylene, polystyrene, and other resins, used for packaging, and as coatings. Plastic packaging and plastic packaging products have an increasing share in the market, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical and other fields, among which food packaging has the largest proportion, such as beverage packaging , Frozen food packaging, steamed food packaging, fast food packaging, etc., these products have brought great convenience to people's lives.

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[Words]: plastic film [phonetic]: sù liào báo mó

PVA coated high barrier film

PVA

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Plastic films are the most widely used in packaging. Plastic film can be used for food packaging, electrical product packaging,

Commonly used plastic films include polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polyester film (PET), polypropylene (PP), and nylon. The properties of various plastic films are different, the degree of ease of printing is also different, and the uses as packaging materials are also different.

Polyethylene film is a colorless, odorless, odorless, translucent and non-toxic insulating material. It is widely used as packaging bags; food bags and various containers. It is an inert material, so it is more difficult to print, and it must be processed before it can print a better effect.

Polyvinyl chloride film has good light resistance, aging resistance, and good tear resistance. It is breathable. It is a clean, colorless, transparent film. Generally, it is added with plasticizer. Solvents such as cyclohexanone. Therefore, it is possible to print with an ink made of a polyvinyl chloride resin. Suitable for packing bags, book covers, etc.

Polystyrene film is a soft and tough film. It is clean, colorless and transparent. When plasticizer is not included, the film layer is always soft, resistant to freezing, and stored without aging. When printing, it uses an oxidative polymerization synthetic binder ink to make Blot fastness is better.

Polyester film is colorless, transparent, moisture-resistant, air-proof, soft, strong, resistant to acid and alkali oil esters and solvents, and is not afraid of high and low temperatures. After electrical discharge treatment, it has better surface fastness to ink . For packaging and composite materials.

Polypropylene film has good gloss and good transparency, heat-resistant acid and alkali, solvent resistance, friction resistance, tear resistance, breathability, and cannot be heat-sealed below 160 ° C.

The strength of nylon film is greater than that of polyethylene film. It is odorless, non-toxic, impermeable to bacteria, oil, ester, boiling water and most solvents. It is generally used for load-bearing, abrasion-resistant packaging, and cooking packaging (reheating food) It can be printed without surface treatment.

Polyethylene molecules basically do not have polar groups, which is a kind of non-polar imprint. In polypropylene molecules, each structural unit contains a methyl group. This kind of weakly polar groups is basically They are also non-polar polymers. Therefore, they have poor affinity for inks, so they must be processed before printing to get a satisfactory print.

Most of the treatment methods use oxidation to increase the polarity and change the surface structure. Specific treatment methods include discharge (commonly known as corona, electric spark) method, flame method, ultraviolet radiation method, acid (sulfuric acid, chromic acid) treatment methods and so on. The discharge method is relatively simple and popular.