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 building ... block screw consists of core spindle and several hollow screw ...