Bimetallic twin parallel screws and barrels

Parallel twin screw and barrel for twin screw extruder.




 For good plasticizing effect, we have differnt design of screw barrel to meet customer's demand.


Scope of application: WPC, PVC, WPC PE, Super high molecular sheet, 1/2 high calcium buckle, 50-400% high calcuium pipe, 50-300% high calcium profile, soft PVC sheet, XPS - PVC etc, PE,PP, ABS, PVC, Pelletzing, pipe, profile, sheet etc...


Extruder Parallel Twin Screw Barrel Technical Information


Main Base materials


1.38CrMoAlA (SACM645)


Main Alloy Materials


1. Ni-based alloy/Deloro alloy


2. SKD-61 (Special Tool Steel)


2. Tungsten carbide/Wolfram carbide


3. 42CrMo (Ultrahigh StrengthSteel)


3. NiCo-based alloy


4. DC53 (Cold WorkDie Steel)


4. Fe-based alloy


5. W6Mo5Cr4V2 (High-SpeedToolSteel)


5. Co-based alloy


Processing Technics


1. Heat treatment


Technical parameters


Nitriding layer depth:0.5-0.8mm


2. Quenching


Nitrided hardness:800-1000HV


3. Nitriding treatment


Bimetallic layer depth:3 mm


4. Bimetallic alloy welding for screw


Bimetallic hardness:55~65HRC


5. Bimetallic alloy centrifugal casting for barrel


Hard-chrome plating hardness after nitriding:≥950HV


6. Hard-chrome electroplating


Chrome-plating layer depth:0.03-0.09mm


Linearity of screw:0.015mm


Surface roughness:Ra 0.4