Low density polyethylene films are generally produced by both blow molding and casting processes. The thickness of the cast polyethylene film is uniform, but it is the most widely used because of its high price and low cost. Low-density polyethylene film is a translucent, lustrous, soft-textured film with excellent chemical stability, heat sealability, water resistance and moisture resistance, freeze-resistant and boilable. Its main disadvantage is its poor barrier to oxygen. It is commonly used in the inner film of composite flexible packaging materials. It is also the most widely used and widely used plastic packaging film, accounting for more than 40% of the consumption of plastic packaging film. .
Since the polyethylene molecule does not contain a polar group and has high crystallinity and low surface free energy, the film has poor printing performance and poor adhesion to inks and adhesives, so it is required before printing and compounding. Surface treatment.