PE film has moisture resistance and low moisture permeability. Polyethylene film (PE) can produce low-density, medium-density, high-density polyethylene, and other products with different properties according to different manufacturing methods and control methods.
1. Low-density polyethylene
Its density is about 0.92g / cm3. The low-density polyethylene film has good transparency and heat sealability, and can be waterproof and moisture-proof; it has low tensile strength, large tensile elongation, and is easy to wrinkle. For films below 0.03mm, the tension control should be small, and the tension should be Constant, especially deformed when heated, causing difficulty in color registration. Therefore, when drying, the surface temperature of the film should not be too high (within 55 degrees).
2. Medium-density polyethylene
Its density is about 0.93 ~ 0.94g / cm3 and its performance is between high density and low-density polyethylene.
3. High-density polyethylene
The density is 0.94-0.965g / cm3. The high-density polyethylene film has a better heat resistance and mechanical strength than the low-density polyethylene film, and the tensile elongation is small. The film thickness is generally above 0.03 mm, but the transparency is poor. Adopt front printing, mainly used as a vest bag, garbage bag, and inner liner bag.
