... 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 building block screw ... design makes it possible to process several kinds of materials with one screw.Base material 38CrMoAlA, Welded inlay on the ...