... pvc doors is mainly used in PVC door & window profiled material, wide door plate, window plate, extrusion of multi-holes pipe for ... , seven holes, nine holes, etc.) For different sectional surface and molds, twin parallel (conical) screws extruder ... enlarged vortex cooling system which is good for cooling and calibrating so as to meet demand ... 8-meter, 11-meter, etc. pvc doors and windows extrusion line