Nylon/PA6/PA66/PEEK Single screw barrel Molybdenum Alloy Certificate ISO 9001 Nylon/PA6/PA66/PEEK Single screw barrel For good plasticizing effect,we have ... Types of screw Gradual type,mutant type,wave type,barrier type,double screen type,shunt type,separation type,exhaust type,pin type,mixed type,double-head type,three-head type,multi head type etc ...