... ISO9001-2008 Carbide alloy screw barrel for plastic screw extruder Techincal Advantages of Bimetallic Nitrided treatment Paralllel twin screw ... etc. Meanwhile,Used for PVC + 30% CaCo3, recylced plastic material,etc Carbide alloy screw barrel for plastic screw extruder DiameterΦ ... pipe, profile, pellet and mould, at the same time,it solved the technical problem of low foaming, high foaming,high filling, ...