1220*2440mm WPC three-layer building formwork making machine Waterproof, fireproof, anti-corrosion High quality Long life WPC three-layer building formwork extruding machine General descriptions 1,Product ... additives and filling agent A- --PVC, B- --WPVC3,Extruder: 80/156 Conical Double Screw Extruder , 65/132 Conical Double Screw Extruder4,Cooling water temperature ...