What are the commonly used stretch films?

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What are the commonly used stretch films?

(1) Polyvinyl chloride film

is the earliest to be used, with good self-adhesion and good tensile and toughness. But the stress retention is poor.

(2)Ethylene- Vinyl acetate copolymer film

Common vinyl acetate containing 10%- 12%, self-adhesive, tensile, toughness and stress retention are good. It has been successfully developed in China and has been proved to meet the requirements of paper bags, plastic woven bags, corrugated boxes and wooden plywood for packaging goods.

(3) Linear low density polyethylene film

This kind of film appeared 1979, compared with polyvinyl chloride and ethylene- Vinyl acetate copolymer film is late, but has the best comprehensive characteristics. Therefore, it is the most widely used stretch film at present. The door viscosity of blown linear low density polyethylene film is higher than that of polyvinyl chloride and ethylene- Vinyl acetate copolymer films are slightly worse, but extruded films are the same.

The final performance of the tensile film made of the above materials depends on the quality of the raw materials used and the processing technology. The properties of several stretch films are shown in Table 3-2.