Processing of films

06:12, 2012-Feb-22 .. 0 comments .. Link

Commonly used food packaging plastic bags are made of polyethylene films, the film is non-toxic, it can be used for containing food. There is a film made of PVC, PVC itself has no toxicity, but based on the film uses the added additives are harmful to human body material, has a certain toxicity. So this kind of films and the film do plastic bags are not used for food.

Polyethylene ( Polyethylene, PE )

Referred to as PE. Vinyl addition polymer is a polymer organic compounds. Polyethylene is the world recognized the best materials in contact with food. Non-toxic, tasteless, odorless, meet the health standards of food packaging. Polyethylene film, light and transparent, with moisture-proof, anti oxygen, acid and alkali resistance, air tightness, excellent heat sealing performance. Plastic packaging printing most dosage, the most important materials.


PVC or PVC, formula ( CH2 - CH2 ) n vinyl polymer, is the most important in a cl***, is currently the world's only second varieties of plastic polyethylene.

Shrinkfilm shrink film

Shrink film ( Shrinkfilm ), is a production process is stretched and oriented, in the use of the process by hot air treatment or infrared irradiation will shrink thermoplastic film. After heat treatment, the film is wrapped in a packaging, contractility during the cooling phase reaches the maximum value, and can be preserved for a long time.

LDPE - low density polyethylene

Low density polyethylene, abbreviation LDPE is all plastic packaging printing industry in the amount of the largest varieties. The proportion is 0.92 ~ 0.93, floating on water. The low crystallinity ( 60%), at a pressure of 1000 ~ 3000kg / C square meters for bulk polymerization, it is also called the high pressure polyethylene. In 23 degrees Celsius, density of around 0.92. Suitable for food packaging, fiber products, packaging, chemical packaging.

HDPE - high density polyethylene

High density polyethylene, referred to as HDPE. Low pressure polymerization, it is also called low pressure polyethylene. A milky white, shiny surface of the poor. Processing of films available **** molding method and T die extrusion process. Heat resistant to cooking, cold freezing resistance, moisture-proof, anti gas, insulation performance is good, not easy to damage, strength of LDPE two times. Easy opening.

BOPP - biaxially oriented polypropylene film

Biaxial stretching polypropylene film, also known as biaxially oriented polypropylene film, English abbreviation code BOPP, characterized by stretching molecular orientation, mechanical strength, folding strength, gas density, moisture barrier property is better than the common plastic film. In unit area and gl*** paper, price below the gl*** paper. Because of this film is excellent in transparency, printing color reproduction is bright and beautiful, is the important base of plastic composite flexible packaging.

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