Segment screw for twin compounding extruder. dia25-133mm,Kinds of single key, head Spline, Hexagon, Involute Spline ect. ... Segment barrel for the twin compounding extruder. Φ25-Φ133mmKinds of single key, head Spline, Hexagon, Involute Spline ect.,The ... several kinds of materials with one screw.Base material 38CrMoAlA, Welded inlay on the flight, prolong life of screw. Easy wearing parts of barrel ...