SKD Co-rotating Parallel Twin-Screw Gearbox
Screw Diameter Range: 16–250 mm | Rated Torque Class: 10.8
Core Features: High torque, low noise, specifically designed for high-filling compounding and pelletizing applications.
Core Design Philosophy
This high-torque gearbox series is purpose-built for co-rotating parallel twin-screw extruders. It is developed based on proven design principles from leading European manufacturers, with further optimization for high-torque and high-speed applications.
By employing power-split technology, the gearbox achieves significantly enhanced load capacity, delivering high precision, high strength, and high-speed performance. The compact and contemporary housing design ensures low noise levels, high transmission efficiency, and reliable continuous operation with minimal oil leakage risk.
Key component service life exceeds 70,000 hours, with an oil leakage rate below 1‰.
Technical Specifications
| Model | Center Distance | Torque Class | Ourput330 | Output400 | Output500 | Output600 | Output800 | Output900 |
|---|---|---|---|---|---|---|---|---|
| Motor Power(KW) | Motor Power(KW) | Motor Power(KW) | Motor Power(KW) | Motor Power(KW) | Motor Power(KW) | |||
| SKD35 | 30 | ＜11 | 22 | 26 | 32 | 39 | 52 | 60 |
| SKD50 | 42 | ＜11 | 58 | 68 | 85 | 104 | 136 | 150 |
| SKD65 | 52 | ＜11 | 110 | 132 | 160 | 190 | 250 | 285 |
| SKD75 | 60 | ＜11 | 170 | 200 | 242 | 295 | 400 | 440 |
| SKD85 | 67.8 | ＜11 | 240 | 280 | 345 | 420 | 550 | 600 |
| SKD95 | 78 | ＜11 | 360 | 435 | 535 | 647 | 800 | 900 |
Structure & Configuration
📌Housing
The housing structure is engineered to absorb operational noise. Manufactured from high-quality gray cast iron and ductile iron with full aging treatment, it offers excellent rigidity and a smooth finish. Advanced multi-axis machining ensures high precision and long-term stability.
⚙️Gears
Gears are produced from high-strength alloy case-hardening steels (20CrMnMo, 20CrNi2MoA, 20Cr2Ni4A). After carburizing and quenching, tooth surface hardness reaches HRC 58–62. Precision grinding achieves gear accuracy up to Grade 5–6 (ISO 1328-1:1995). Key components undergo surface strengthening with tooth profile and helix modifications to ensure optimal meshing under load, resulting in low noise and high efficiency.
🔧Bearings
Bearings are sourced from leading domestic and international brands, including ZWZ, FAG, INA, TWB, SKF, NSK, and NTN.
🛡️Seals
Oil seals are primarily imported from established brands such as CTY (Germany) and SOG (Taiwan).
🫙Lubrication
The gearbox is equipped with a forced cooling lubrication system, high-efficiency brazed plate heat exchangers, flow meters, temperature sensors, and pressure gauges to ensure reliable thermal management under high-speed, high-torque operation.
[Assembly View – SKD Gearbox Before Shipment]
Applications
1.Engineering Plastics Alloys & High-Performance Compounding
- Material Systems: PA66/PPO, PC/ABS, PP/PA, PET/PP alloys
- Process: Medium-temperature extrusion, tensile flow field, enhanced interfacial bonding
- Advantages: Uniform dispersion, improved mechanical properties, minimal degradation
- Typical Products: Automotive structural parts, electronic housings, high-temperature structural components
2.High-Filling Compounding & Pelletizing
- Material Systems: PP/PE + CaCO₃, talc, glass fiber, flame retardants
- Filling Ratio: Stable material conveying at filler levels exceeding 50%
- Advantages: No slippage, no agglomeration, uniform plasticization, low energy consumption
- Typical Products: Injection-molding grade pellets, sheet/base materials, pipe compounds
3.Nano & Functional Masterbatches
- Material Systems: Nano SiO₂, montmorillonite, graphene, carbon nanotubes
- Advantages: Tensile flow field breaks agglomeration, dispersion quality significantly superior to conventional twin-screw systems
- Typical Products: Antistatic masterbatch, barrier masterbatch, reinforced masterbatch, high-concentration color masterbatch
4.Biodegradable Materials
- Material Systems: PLA, PBAT, PBS, starch-based, bamboo/flour fiber composites
- Advantages: Low shear, minimal chain scission, excellent venting, no odor
- Typical Products: Biodegradable film, food containers, disposable packaging, agricultural mulch film
5.Pipe & Profile Extrusion
- Product Range: HDPE water supply pipes, MPP power conduits, CPVC conduits, PPR pipes
- Advantages: Uniform plasticization, stable wall thickness, smooth surface finish, minimal bubble content
- Benefits: Higher yield, increased output, reduced energy consumption
6.Rubber & Elastomer Compounding
- Material Systems: Tire rubber, sealing strip compounds, TPE/TPR, reclaimed rubber
- Advantages: Intensive mixing, low overheating
- Benefits: Output increased by approximately 50%, energy consumption reduced by approximately 30%