... pvc foam sheet machine, pvc foaming board equipment, pvc crust foam board machine, pvc foam board extrusion machine, pvc skinning foam board extrusion machine, triple extrusion pvc foam sheet produciton line, three layers co-extrusion pvc foam ... MERITS OF TRIPLE LAYER CO-EXTRUSION FOAM BOARD PRODUCTION LINEThis production line composes of conical twin screw extruder, plate dies, forming table, hauler ...