... extrusion construction PP/PE/PP. 1. IntroductionPolyolefin (POF) heat-shrinkable film is one kind of multi-layer (inside and ... two steps of blowing inflation.POF film has good heat-shrinkable characteristic, mainly used to pack regular or irregular ... frame, toy or doll, insecticide, household wares, foodstuffs, cosmetic, canned & bottled beverage, dairy products, pharmaceuticals and cassette tape, etc. ...