double screw extruder parallel twin screw extruder twin screw extruder CE certification,L/D=32~52 high speed high ... 45 steel and lined with alloy bush, water-cooling for barrels. The first barrel is for feeding; the fifth barrel is open side barrel, the side ... pin valve, the ten barrel is for vacuum degasification, and the eleventh one is for extrusion.,and others are for close barrels.6)Heat system ...