1.conical twin screw extruder 2.directly molding of PVC powder materiral, good effective ... .air or oil cooling for barrel Conical Twin Screw Extruder LSZ series twin screw conical extruders are high effective extrusion equipments, they ... powder material, good effective.2). Adopted automatic termocontrol, vacuum exhaust, screw core cooling. Air cooling or oil cooling for barrel.3 ...