Technical Specifications (Product Matrix)
| Parameter | Specification Range |
| Screw Diameter Range | Ø 30 mm – Ø 300 mm |
| Screw Length (Max) | Up to 5,000 mm |
| L/D Ratio (Length-to-Diameter) | 8:1 – 12:1 (Hot Feed)
12:1 – 20:1 (Cold Feed & Venting) |
| Screw Structures Available | Pin type, Barrier mixing, Venting, Double-flight, Bypass |
| Heating/Cooling Type | Water or Oil jacketed temperature control systems (barrel & internal screw cooling) |
| Applicable Base Materials | SACM 645 (38CrMoAlA), SKD61, Premium Bimetallic Alloys |
| Surface Hardness | Nitrided: HV 900 – HV 1000
Bimetallic: HRC 58 – HRC 68 |
| Straightness Tolerance | < 0.015 mm per meter |
Advanced Material & Surface Treatment Technologies
To combat the aggressive abrasive and corrosive nature of rubber compounds (especially those with silica, carbon black, or sulfur fillers), we offer targeted metallurgy options:
Nitride Class (Cost-Effective & Wear-Resistant)
Material: SACM 645 / 38CrMoAlA
Process: Gas Nitriding (treatment depth: 0.5 – 0.8 mm)
Surface Hardness: >= 950 HV
Application: General-purpose rubber compounding and low-wear profiles.
Bimetallic Class (Extreme Wear & Corrosion Protection)
Barrel Liner: Centrifugally cast alloy (Fe-Ni-Cr-Co-W base) with thickness 2.0 – 3.0 mm.
Screw Flight Coating: PTA (Plasma Transferred Arc) welding of Tungsten Carbide (WC) or Cobalt-based alloys.
Surface Hardness: HRC 60 – HRC 68.
Application: High-silica compound extrusion, EPDM, and corrosive halogenated rubbers.
Specialized Screw Designs for Rubber Extrusion & Molding
Unlike plastics, rubber processing requires tight control over shear heat to prevent premature curing (scorching). We customize the flight geometry to optimize your process:
Pin-Barrel System: Staggered pins break up the laminar flow, providing intensive distributive mixing at exceptionally low melt temperatures.
Barrier / Transfer Screws: Separates un-melted solid compounds from the plasticized mass, maximizing throughput and reducing air entrapment.
Internal Screw Cooling: Deep-hole gun-drilled channels run through the center of the screw, allowing fluid/water circulation to prevent overheating of the screw core.
Standard Model Reference Table (Customizable)
| Screw Diameter (Ø, mm) | Typical L/D Ratio | Reference Output (kg/h) | Main Application |
| Ø 45 | 12D / 16D | 40 – 80 | Small profiles, laboratory testing, rubber strips |
| Ø 65 | 16D / 20D | 80 – 150 | Cable sheathing, automotive weatherstripping |
| Ø 90 | 16D / 20D | 200 – 350 | Tire treads, medium industrial hoses |
| Ø 120 | 12D / 16D / 20D | 400 – 800 | Heavy conveyor belts, large engine mounts |
| Ø 150 | 12D / 16D | 700 – 1000 | High-capacity tire tread compounders |