POF stands for heat shrink film. POF is the full name of multi-layer co-extruded polyolefin heat shrink film. It is made by using linear low-density polyethylene as the middle layer (LLDPE), and copolymerized polypropylene (pp) as the inner and outer layers. It is formed by melting and extruding through five extrusion machines, and then processed through special techniques such as die forming and bubble blowing. It is used for packaging products of regular and irregular shapes.