Triple-flighted Screw Element

Triple-flighted screw element in the same screw speed, can be applied to the material higher average shear rate and shear force, in addition, due to the shallow screw groove, the material layer becomes thin, triple flighted than double flighted heat transfer performance is good, conducive to material plasticization, melting. However, because of the strong shear, generally not easy to use for shear-sensitive material processing, such as glass fiber, PVC.

The materials for selection and the heat treatment

△ The nitrided steel, 72h ( two-stage gas nitriding).

△ The high-speed tool steel, W6Mo5Cr4V2 (vacuum quenching).

△ The die steel, D2(1.2379, SKD11,K110)  (quenching + tempering).

△ The bimetal composite rods (inside tough, outside hard or corrosion resistant), supplied by SAAR company from German or HTM company from Swiss.

△ Other special materials such as Hastelloy, W-C, nickel-based alloy, etc.

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