Direct extrusion or inline-compounding facilitates the production of extruded parts in a very economical way by merging various process steps. The stage after the compounding step is shaping. Here the extrudate is processed to semi-finished products. Typical examples for this procedure is the production of sheets made of wood flour/PP, acoustic and insulation films with BaSO4 or the processing of undried PET, PP, PS to flat or biaxially oriented films.
In the first production step for calender films the pellets are melted in the extruder. Afterwards a film die directs the melt onto a calender stack. This procedure facilitates a high production speed and high film transparency. Polymers which can be processed this way are PET, PP, PE, PS, PC, ABS, PMMA and PLA.