... two bubble blowing machinefor producing POF heat-shrinkable film of co-extrusion construction PP/PE/PP. 1. IntroductionPolyolefin (POF) heat ... article, plastic product, stationery, book, breadboard, NP3, VCD, art, wood craftworks as picture frame, toy or doll, insecticide, household wares ... tape, etc.GHFB-45/75/45-1800 Three Layer Co-extrusion POF Heat-Shrinkable Film Blowing Machine is a line ...