1. This screw material cylinder is elabroately made of 38CRMOALA alloy steel after nitrogentreatment and has best rigidity and corrosion resistance.
2. The mould head is plated with hard chromium and has screw mandrel structure withuniform and smooth material discharging. And the aircooled device has labyrinth typestructure with characteristic as uniform air-jut quantity, automatic temperature controland automatic heating.