Plastic packaging film manufacturer, LDPE plastic packaging film:
Low-density polyethylene film is generally made by blow molding and casting process. The thickness of the cast polyethylene film is uniform, but it is rarely used due to its high price. Blow-molded polyethylene film is made from blow-molded PE particles by a blow molding machine, and the cost is low, so it is widely used.
The low-density polyethylene film is a translucent, shiny, soft texture film with excellent chemical stability, heat sealability, water-resistance, and moisture resistance, freeze resistance, and can be boiled. Its main disadvantage is its poor barrier to oxygen. It is often used in the inner film of composite flexible packaging materials. It is also a widely used plastic packaging film with a large amount of consumption, accounting for about 40% of the consumption of plastic packaging film. the above.
The polyethylene molecule does not contain polar groups and has high crystallinity and low surface free energy. Therefore, the film has poor printing performance and poor adhesion to inks and adhesives, so it is necessary before printing and compounding. Surface treatment.