Parallel twin barrel, screw specifications：
PX-Ø65/2、Ø80/2、Ø90/2、Ø105/2、Ø125/2、Ø146/2、Ø150/2

Length/Diameter Ratio(L/D)：L/D=18-25

Comressing rate of screw can be designed according to different raw materials and products.

Technical Indexes：

Material selection with high quality 38CrMOALA

Tempering Hardness：HB240°～280°

Nitriding Hardness：HV850°～1000°

Nitriding Depth：0.45～0.7mm

Nitriding Brittleness：≤Grade 2

Surface  Roughness：Ra0.4

Screw Straightness：0.015mm

Hardness of surface chromium coating after nitriding：≥900HV

Thickness of chromium coating：0.05～0.10mm

Hardness of dual alloy：HRC56°～65°（nickel base alloy）

Alloy Depth：0.8～2.0mm