Double Screw and Barrel for Extruder Size:screw diameter ø15-ø300mm Maximum screw length :10000mm The conical twin screws and barrel can be designed different structure according to the different product and market requests. Specifications of conical twin-screw and barrel: 1.Injection molding machine Clamping force:250kn-3,2000kn 2.Single screw extruder Screw diameter:15mm-360mm LD ratio:15-46 3.Conical twin screw extruder Screw diameter:25mm-92mm 4.Counter rotating parallel twin screw Screw diameter:50mm-200mm L/D ration:16-35 5.Co-rotating twin screw extruder Screw diameter:25mm-120mm 45/90 45/97 50/103 55/110 60/120 65/125 68/146 80156 80/172 92/188 Double-alloy technical standard: Double-alloy level: 1.Level A - containing tungsten of 40% 2.Level B - containing tungsten of 25% 3.Level C - containing tungsten of 9.5% 4.Hardness of alloy: HRC56-65o Applied scope of plastic: applied for PVC and WPC material, has a high output and stable performance. 1.Components of alloy powder: Ni + Co + Cr + W + Si + Fe + B + C 2.Depth of alloy layer: 1.2 mm-2.0 mm 3.Hardness of alloy: HRC>65° 1.Hardness of adjuster:HB260-290 2.Hardness of nitration:HV800-1050 3.Depth of nitration case :0.4-0.7mm 4.Fragility of nitration:less than grade 1 5.Rougness of the surface:Ra0.4 6.Linearity of the screw:0.015mm 7.The surface hard chromium plating hardness after nitrogenation�900HV 8.Depth of double alloys:0.8-2.0mm Used for granulation ,PP,PE,PA,PC,ABS,AS etc We can manufacture various kinds of screw barrels