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Parallel twin screw extruder is widely used in the filling, blending, modification, enhancement, chlorination polypropylene and high water absorbent resin. Extrusion of degradable parent material, polyamide condensation and polyurethane polymerization; Granulation of carbon powder and magnetic powder, insulation materials for cables, mulch materials, low-smoke low-halogen flame retardant PVC cable materials, and preparation of various silane crosslinking materials. Small models are mainly used for scientific research and teaching.