Parallel Twin Screw and Barrel for PVC Extrusion Screw Barrel
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Twin parallel screw barrel, bimetallic screw barrel, Bimetallic Parallel Twin Screw cylinder for PVC film extrusion
Specification:
Screw Diameter: Φ 15- Φ 300
L/D ratio: 15-46
Product classification:
Aiming at different plastic products the screw can be chosen from: General type, pin type, barrier type, separation type, and gas-exhausting type, etc.
Technical Information
Base Materials:
1). 38CrMoAlA(JIS SACM645).
2). 42CrMo(AISI 4140).
3). 9Cr18MOV
Bimetallic alloy materials:
1). Fe-based alloy
2). Ni-based alloy/Deloro alloy
3). Co-based alloy
4). NiCo-based alloy
5). Tungsten carbide/Wolfram carbide
Technics:
Heat treatment
High-frequency quenching
Nitriding treatment
Hard-chrome electroplating
Bimetallic alloy welding
Bimetallic alloy centrifugal casting
Technical parameter:
Nitrided layer depth: 0.5-0.8mm
Nitrided hardness: 900-1000HV
Nitrided brittleness: Less than grade 1
Surface roughness: Ra0.4
Linearity of screw: 0.015mm
Hard-chrome plating hardness after nitriding: >=950HV
Chrome-plating layer depth: 0.025-0.085mm
Bimetallic layer depth: 3mm
Warranty and service: 1 year
Our advantages:
1). Excellent raw materials
2). Good customer service
3). Rapid delivery
4). Reasonable price
5). Production quickly
Experienced manufacture, we will be the best choice.
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Main Base materials
 1.38CrMoAlA  (Nitriding Steel)
2.  SKD-61   (Special Tool Steel) 3.  42CrMo (Ultrahigh Strength  Steel) 4. DC53 ( Cold Work  Die Steel)  5. W6Mo5Cr4V2 ( High-Speed  Tool  Steel ) 6. HPT Â
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Main Alloy Materials1. Â Ni-based alloy/Deloro alloy
2.  Tungsten carbide/Wolfram carbide 3.  NiCo-based alloy 4. Fe-based alloy 5. Co-based alloy  Â
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Processing Technics1. Heat treatment
2.  Quenching 3. Nitriding treatment 4.  Bimetallic alloy welding 5. Bimetallic alloy centrifugal casting 6. Hard-chrome electroplating Â
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Technical parametersNitriding layer depth
0.5-0.8mm
Nitrided hardness
HRC56-58
Nitrided brittleness
Less than grade 1
Surface roughness
Ra 0.4
Linearity of screw
0.015mm
Hard-chrome plating hardness
≥HRC57
Chrome-plating layer depth
0.03-0.09mm
Bimetallic layer depth
3 mm
Bimetallic layer hardness
HRC58-62
Above are main technical information, a suitable screw and barrel will be made according to your requirement.