Types Of PE Film

Low density polyethylene
Its density is about 0.92g/cm3. Low density polyethylene film has good transparency and heat sealing properties, and can be waterproof and moisture-proof; Low tensile strength, high tensile elongation, and easy wrinkling. For films below 0.03mm, the tension control should be small, and the tension should be constant everywhere, especially when heated, it is more prone to deformation, causing difficulty in color matching. Therefore, when drying, the surface temperature of the film should not be too high (within 55 degrees). According to different film-forming processes, it can be divided into several types such as blown film (IPE), drooling film (CPE), low foaming film, etc. The tensile strength and aperture of IPE film are better than those of CPE film. It is printed on the front and can be used as food bags, clothing bags, etc; CPE film has uniform thickness, better surface glossiness, transparency, and heat sealing properties than PE, and can be printed on both sides, but the production cost is high. CPE film is mainly used as the inner layer of composite bags and the packaging of cosmetics, Pickled vegetables and cakes; Low foaming film has good decorative properties, thick texture, and is not easily stretched or deformed. It is printed on the front and used as a New Year's painting, trademark, and handbag.
Medium density polyethylene
Its density is about 0.93-0.94g/cm3, and its performance is between high-density and low-density polyethylene.
High density polyethylene
The density is between 0.94-0.965g/cm3. High density polyethylene film has better heat resistance and mechanical strength than low-density polyethylene film, with lower tensile elongation. The film thickness is generally above 0.03mm, but the transparency is poor. Using front printing, mainly used for vest bags, garbage bags, and inner lining bags.
Cross linked polyethylene
Due to its higher heat resistance, tensile strength, thermal shrinkage rate, and barrier properties compared to other polyethylene products, its use has been further expanded. In 2014, it was mostly used as a thermal shrinkage packaging film.
Generally speaking, as the density increases, the mechanical and barrier properties will correspondingly improve, and the heat resistance will also improve. Polyethylene of the same density also has different properties due to different film-forming processes. This is because the salivation method can cool quickly, has low crystallinity, high transparency, and low turbidity, but the molecular arrangement is more irregular, resulting in lower barrier properties, higher transmittance, lower elongation, and poor tear resistance.