Machine barrel screw, screen changers, die top major components made of high quality alloy steel (38CrMoAlA) and nitrogen treatment, high hardness, corrosion resistance, long life and other advantages. Length-diameter ratio of screw, ensure that the sheet has good plasticizing properties. Screen changer with hydraulic dual-screen device, without downtime screen. Convenient operation and improve production efficiency. In addition the company can be customized according to your specific requirements!