... : This unit, a three-layer co-extruding film blowing machine unit for polyolefin of heat drink film (POF), is ... the basis of foreign technology. It is a second forming machine unit for polyolefin of heat contra-cited film (POF). ... -layer co-extruding conical surface overlying die, infrared heating system, adjustable thermo-controller, infrared temperature testing system, tension controller and rotation ...