... the specification is SJ51/105,frequency control.The screw and the barrel are made by 38CrMoALA high quality alloy ... powder.Technical data:The screw diameter:51/105mm,the screw and the screw cylinder has been handled through nitriding ,and the the depth ... forced lubricating cooling unit.The double screw extruder also called conical twin screw extruder, twin screw extruder, plastic extruder, etc. double ...