... of single key, head Spline, Hexagon, Involute Spline ect. Segment barrel for the twin compounding extruder. Φ25-Φ133mmKinds of single key ... , Hexagon, Involute Spline ect.,The building block screw consists of core spindle and several hollow screw segments which can be replaced ... the flight, prolong life of screw. Easy wearing parts of barrel feed inlet made from imported anti-wear alloy can be ...