In the production of multi-core cables, achieving perfect back-twist, uniform lay length, and high production speed is essential for electrical performance and mechanical quality. The RLB Bow Type Laying Up Machine (models KW-100, KW-125, KW-160) is a high-efficiency solution designed specifically for stranding 2–6 cores of ABC overhead cables, control cables, and power cables.
Adopting 100% back-twist technology, this bow-type cabler ensures minimal internal stress in the conductors while delivering excellent roundness and stable lay length.
Working Principle of the RLB Bow Type Laying Up Machine
The machine operates on the proven skip/bow stranding principle: insulated cores or stranded conductors are paid off from rotating bows in a continuous, high-speed motion. The bow frame—constructed from high-tensile-strength, lightweight materials with an optimized aerodynamic profile—rotates while the cores pass through a series of guides, applying exact back-twist without additional torsional forces. This design ensures the cable remains stress-free, preserving insulation integrity and electrical properties. Independent AC servo drives synchronize the main bow, traction unit, and take-up, while the HMI + PLC system provides real-time pitch adjustment (stepless via touchscreen) and full process monitoring.
Key Advantages of the RLB Bow Type Laying Up Machine
- 100% Back-Twist Mode: Superior cable quality and electrical performance for high-frequency and power applications.
- Independent AC Servo Drives: Main bow, traction capstan (or caterpillar), and take-up are driven separately for precise synchronization and pitch control.
- HMI + PLC Intelligent Control: Automatic pitch adjustment, real-time monitoring, and easy operation via touch screen.
- Constant Tension Control: Electromagnetic tensioner + manual adjustment system ensures stable tension from full to empty bobbin.
- Optional Filling & Taping: Up to 24 filling devices; can be equipped with one or more semi-tangential taping machines for simultaneous laying-up and taping.
- Flexible Haul-Off & Bobbin Handling: Dual-wheel capstan for medium sizes or caterpillar for larger power cables; side/front/back crane loading for easy bobbin change.
The machine supports stranded conductors with copper wire diameter ≥ Φ1.5 mm and aluminum wire diameter ≥ Φ1.7 mm, making it ideal for both overhead bundled conductors and underground power cables.
Technical Specifications
| Model |
Pay-off Bobbin (mm) |
Line Speed (m/min) |
Conductor Section (mm²) |
Max. Core Diameter (mm) |
Max. Rotate Speed (rpm) |
Motor Power (kW) |
| KW-100 |
1000 |
150 |
8-70 (1+3B) / 10-70 (1+4B) / 14-70 (1+5B) |
12 |
500 |
45 / 55 / 65 AC |
| KW-125 |
1250 |
150 |
10-95 / 14-95 / 14-95 |
16 |
400 |
55 / 65 / 75 AC |
| KW-160 |
1600 |
150 |
14-120 / 14-120 / 25-120 |
20 |
400 |
65 / 75 / 90 AC |
Take-up and pay-off drum sizes can be customized according to customer requirements.
Bow Type vs Traditional Cradle Laying-Up Machine – Performance Comparison
| Feature |
RLB Bow Type / Skip Stranding Machine |
Traditional Cradle Laying-Up Machine |
| Back-Twist |
100% (zero residual stress) |
Limited / partial |
| Max Rotor Speed |
400–500 rpm |
50–200 rpm |
| Productivity |
3–10× higher |
Lower due to higher inertia |
| Suitable Cable Types |
ABC overhead, control, power (≤120 mm²) |
Larger power cables (>120 mm²) |
| Noise & Safety |
Fully enclosed, <75 dB |
Higher noise, open design |
| Pitch Adjustment |
Stepless via PLC/HMI |
Manual gear changes |
| Tension Stability |
Constant full-to-empty |
Variable |
| Integration with Taping |
Online simultaneous operation |
Often requires separate pass |
Primary Applications
- ABC (Aerial Bundled Conductor) Overhead Cables
- Control & Instrumentation Cables
- Low- and Medium-Voltage Multi-Core Power Cables
- Rubber-Insulated Flexible Cables
The RLB bow type laying-up machine can be seamlessly integrated with online semi-tangential taping units (double-pad non-metallic or copper tape) to realize synchronized laying-up and taping in a single pass, significantly improving production efficiency and cable quality.
Seamless Integration & Long-Term Reliability
The RLB series integrates effortlessly with online semi-tangential taping units, filling devices, and downstream take-up systems for fully automated, single-pass production. Its rugged structure, modern monitoring, and centralized lubrication ensure high accuracy, repeatability, and minimal maintenance—delivering years of trouble-free operation in 24/7 cable plants worldwide.
Why Partner with RLB – Your Reliable Cable Machinery Supplier
With decades of experience as a trusted Bow Type Laying Up Machine and Cable Stranding Machine manufacturer, RLB combines German-level engineering precision with practical, customer-driven customization. Every machine undergoes dynamic balancing, rigorous testing, and CE/ISO compliance verification before shipment. We emphasize reliable quality, technical solutions, and long-term cooperation—providing full lifecycle support from initial consultation and factory layout design to installation, operator training, spare parts, and remote technical assistance.
Inquiry Now – Contact our senior technical team today for a detailed proposal tailored to your cable specifications, production volume, and plant requirements. Let us help you upgrade your cabling line with proven, high-performance technology that maximizes output, minimizes costs, and ensures consistent premium cable quality.
Bow Type Laying Up Machine
Discover the RLB Bow Type Laying Up Machine (Skip Stranding Machine & Cable Laying-Up Machine) with 100% back-twist technology, independent AC servo drives, and HMI+PLC control. Ideal for 2–6 core ABC overhead cables, control cables, and power cables up to 120 mm². High-speed, constant tension, optional online taping & filling. Custom solutions from a trusted cable machinery manufacturer. Inquiry Now.
Product SKU:
RLB-KW-Series
Product Brand:
RLB Machinery
Product Currency:
USD
Product Price:
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Product In-Stock:
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