Stretch film
Stretch film, also known as heat shrink film, was initially produced in China using PVC as the base material and DOA as a plasticizer for self-adhesion. However, due to environmental concerns, high cost (relatively higher density than PE, resulting in smaller packaging area per unit area), and poor tensile strength, it was gradually phased out when PE stretch film production began in China in 1994-1995. PE stretch film initially used EVA as the self-adhesive material, but its high cost and odor led to the development of PIB and VLDPE as self-adhesive materials. The base material is primarily LLDPE, including C4, C6, C8, and metallocene PE (MPE).
