What is the density of the common PE films?
PE film, that is polyethylene film. Polyethylene plastics are of high density, medium density and low density. Generally linear low-density polyethylene density: 0.91 - 0.965g/cm3 (g / cm3).
Medium density polyethyleneIts density is about 0.93 ~ 0.94g/cm3, and its performance is between high density and low density polyethylene.HDPEThe density is 0.94 - 0.965g/cm3. The heat resistance and mechanical strength of HDPE films are better than those of LDPE films, the elongation at elongation is small, and the film thickness is generally over 0.03mm, but the transparency is poor. It is mainly used for vest bags, garbage bags and lining bags.
Its density is about 0.92g/cm3. Low density polyethylene film transparency and good sealing performance, waterproof, moisture-proof; low tensile strength, tensile elongation, easy wrinkled, thin film below 0.03mm, tension control should be small, and all the tension to a constant, especially easy to deform when heated, causing difficulties in color. Therefore, when drying, the film surface temperature should not be too high (within 550C). According to the film forming process, can be divided into blown film, cast film (IPE) (CPE), several low foaming film etc.. IPE thin film tensile strength and opening than CPE film, with positive printing, can be used for food bags, clothing bags; CPE thin film thickness uniformity, surface gloss, transparency and thermal sealing is better than PE, but positive and negative printing, but the production cost is higher. CPE film is mainly used as the inner layer of composite bags and cosmetics, pickles and pastry packaging; low foaming film decorative, thick texture, not easily tensile deformation, using positive printing, as New Year paintings trademarks and hand bag etc..
