parallel twin screw and barrel

parallel twin screw and barrel Specification: 1)diameter:45-150 2)ratio of length to diameter:L/D=18-25 Technical index: 1)Depth of nitration case:0.4-0.7mm 2)Hardness of nitration:HV1000 3)Roughness of the surface:260-290HB 4)Screw straightness: 0.015mm/m 5)Chrome plating thickness: 0.01-0.1mm 6)Fully hard screw(wear-proof, corrosion-proof, heatproof, high-pressure proof and high-speed proof):HPT1 HPT2 HPT3 7)Suitable plastic material: PP,PE,ABS,AS,PS etc. 8)Material: SACM-645, SCM440, 38CrMoALA