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Screws and other consisting parts are designed respectively against the features of different materials such as PP, PE, PS, ABS, PA, PVC, POM, EVA, LCP, PET, PMM etc. It is suitable for the purpose of material color blending. High torque design, less noise, and working stable. Screw and barrel are through special hardness treatment ensures more durable and long service life time.Air-exhaust system or common vented hole can get rid of water and waste gas out of the material. This enables more stable extrusion and more solid pellet.