The main material used for heat shrinkable films is a variety of thermoplastic films. Initially, PVC heat shrink film mainly, with the continuous development of market demand, PVC shrink film gradually reduced, and a variety of PE, PP, PET, PVDC, POF to more than 20% growth rate. In recent years, shrinking film has been rapid development, with the changing needs of the market, shrinking film is a multi-level, functional direction.