Twin-screws and Barrels for Parallel Twin-screw Extruders
Harden Industries’ counter rotating parallel twin screw and cylinder focus is on providing high surface area and low shear screw designs that will optimize the homogeneity of the melt, maximize the productivity of the extruder, and provide long lasting life for both the screws and barrel. Carbide coating hardening of screw flights is also available.
Harden ‘s counter rotating conical and parallel twin screws and barrels provide long lasting life for both the screws and barrel. We have been supplying conical twin-screws to many of the major PVC twin screw extruder manufacturers in China and our products have been used around the world as a good alternative of low cost replacement parts.
Screw & Barrel Ranges for Single Screw Extruder
| Screw Diameter | 50mm -180mm |
|---|---|
| Screw Length | L/D ratio 16 – 35 |
Screw Technical Specifications
| Steel Material | DIN 41CrA1Mo7 / AST M4140 / GB 38CrMoAlA, 9Cr18MoV |
|---|---|
| Heat Treatment | Tempered and nitride, nitride depth: 0.5 mm – 0.7 |
| Surface hardness: | HV900 – HV1, 000 |
| Special treatment: | Carbide coating (screw flight) and bimetallic barrel |
| Screw straight tolerance | 0.015 mm/m |
| Surface roughness | Ra 0.4μm |