The single screw extruder unit is mainly used for filling, blending, modifying, adding, chlorinating, polypropylene, and high water absorption resin processing of rubber and plastic and engineering resins; Extrusion of degradable masterbatch, polyamide condensation polymerization, and polyurethane addition reaction; Granulation of carbon powder and magnetic powder, preparation of insulation and sheath materials for cables, low smoke and halogen-free flame-retardant PVC cable materials, and various silane crosslinking materials. Small models (testing machines) are mainly used for scientific research and teaching.