Conical Twin Screw Barrel For PVC Pipe Extrusion

       Bimetallic twin barrel has got the nation patent,and we are the only company in manufacturing the bimetallic twin barrel.Adopting the technique of rotary casting alloy,it makes the alloy powder’s compactness and wearing resistance the same as the bimetallic single barrel thus solving the defect of short service life and low wear-resisting of nitrided twin barrel,and rewrite the history of only manufacturing bimetallic single barrel but no bimetallic twin double barrel in domestic land.
    Wc-10 tungsten carbide alloy ,with the characteristics of high hardness ,high hard-wearing and corrosion resistance ,and high temperature resistance ,the hardness of alloy layer reaches HRC60-65,thus having the service life of 5-8 times longer than the nitrided one.It is suitable for processing PVC plus calcium powder,building plastic template, pipe, sheet, ,WPC , hanging plate and other engineering plastics.
    Grade A screw: the base material is SKD61,Din 1.8519 or 1.8550,with the hardening then nitriding, the surface hardness of screw can reach HRC60-65,thus having the characteristics of  high wearing and corrosion resistance .
Grade B screw : the base material is 38CrMoAla,the screw flight through the high temperature spraying Ni-based alloy powder,the surface hardness can reach HRC58-62,thus having the characteristics of high wearing and corrosion resistance.