In medium- and high-voltage power cable manufacturing, rigid stranding technology is widely recognized as the most effective method for producing compact, mechanically strong armoring layers and shielding structures. Unlike planetary or tubular stranders, rigid cage stranders offer superior rigidity, higher rotational speeds, better compaction, and significantly lower maintenance requirements.
The RLB Rigid Stranding Machine (ST56 and ST63 series) is a heavy-duty non-back-twist strander specifically engineered for high-volume armoring and shielding applications. It is ideal for steel wire armoring, copper wire shielding, copper tape shielding, round aluminum wire armoring, and pre-twisted sector conductor stranding.
With its robust ground shaft drive system, automatic bobbin loading, and intelligent constant tension control, this machine delivers consistent high-quality output with excellent productivity — making it a preferred choice for cable manufacturers in Saudi Arabia and the GCC.
Technological Process
Payoff reels (automatic side or front loading) → Rigid cage with multiple bobbins → Non-back-twist stranding at high rotational speeds → Precision die holder for round or sector compaction → Meter counter and dual-wheel capstan → Automatic take-up bobbin.
The concentric rigid cage design ensures a smooth wire path, constant tension, and perfect synchronization between mechanical and electrical systems, enabling stable high-speed operation with minimal vibration.
Core Technical Advantages & Operational Benefits
True Non-Back Twist Rigid Stranding The rigid cage design provides exceptional stability and compaction, making it ideal for armoring layers and large-section conductors where mechanical strength and roundness are critical.
Automatic Bobbin Loading System Available with side-lower or front automatic loading mechanisms. This significantly reduces changeover time, lowers labor requirements, and minimizes production downtime.
Constant Tension Control Aerodynamic resistance combined with electromagnetic brakes provides precise, automatic tension compensation from full to empty bobbin, ensuring uniform lay length and high-quality stranding throughout the entire bobbin.
Robust Ground Shaft Drive System Independent AC motors per cage deliver perfect electrical synchronization, stable high-speed operation, low noise, and reduced maintenance compared to traditional drive systems.
Intelligent MMI + PLC Control Easy pre-setting of stranding pitch, direction, tension compensation, and full synchronization with the pulling capstan and take-up unit. The system supports recipe storage for different products.
Versatile Material Handling Handles copper wires (1.5–3.6 mm), aluminum and aluminum alloy wires (1.75–5.0 mm), and steel wires, with bobbin loading capacity up to 1200 kg.
These features deliver higher output, lower scrap rates, reduced energy consumption, and consistent high-quality armored and shielded cables.
Technical Specifications
| Model | Configuration | Pay-off Reel (mm) | Copper Wire Dia. (mm) | Aluminum Wire Dia. (mm) | Max. Stranded OD (mm) | Rotor Speed (rpm) | Line Speed (m/min) | Main Motor Power (kW) |
|---|
| ST56 | 6B–30B | 560 | 1.5–3.6 | 1.75–5.0 | 80 | 45–220 (config dependent) | 90–320 (config dependent) | 45–75 AC |
| ST63 | 6B–30B | 630 | 1.5–3.6 | 1.75–5.0 | 80 | 45–210 (config dependent) | 80–300 (config dependent) | 55–75 AC |
Performance values vary by bobbin configuration (higher speed with fewer bobbins). Custom configurations available.
Main Parts & System Integration
- Rigid cage with internal bobbins and flying wings
- Automatic bobbin loading system (side or front)
- Precision die holder for round/sector compaction
- Ground shaft transmission with independent AC motors
- Constant tension control (aerodynamic + electromagnetic brakes)
- Intelligent MMI + PLC control cabinet
- Compatible with pay-off, traction, and take-up systems
Purpose: High-speed, high-compaction stranding and armoring for medium- and high-voltage power cables with maximum reliability and minimal maintenance.
Primary Applications
- Steel wire armoring for power cables
- Copper wire and copper tape shielding cables
- Round aluminum wire armoring and stranding
- Pre-twisted sector conductor stranding and armoring
- Medium- and high-voltage armored and shielded cable production
The RLB Rigid Stranding Machine is the ideal solution for manufacturers seeking reliable, high-speed armoring and shielding capability with minimal maintenance and maximum flexibility.
Why Choose Our Rigid Stranding Machine?
- Superior Rigidity & Compaction: Better mechanical strength and roundness than planetary stranders.
- High Productivity & Low Downtime: Automatic bobbin loading and constant tension control.
- Energy Efficient & Low Maintenance: Ground shaft drive system with independent motors.
- Full Local Support in Saudi Arabia: Turnkey installation, operator training, 24/7 remote diagnostics, and spare parts availability in the Eastern Province.
- Vision 2030 Aligned: Supports local manufacturing of high-quality armored cables for power grid expansion and industrial projects.
Detailed FAQs – Answering Your Customers’ Real Questions
Q1: What is the main advantage of a Rigid Stranding Machine over planetary stranders?
A: The rigid cage design provides superior rigidity, higher rotational speeds, better compaction, lower energy consumption, and significantly reduced maintenance costs — ideal for large-section armored and shielded cables.
Q2: Does it support automatic bobbin loading?
A: Yes. Side-lower or front automatic loading mechanisms (customizable to your site) greatly reduce labor and changeover time.
Q3: Can it handle both copper and aluminum wires for armoring?
A: Yes. Fully versatile for copper (1.5–3.6 mm), aluminum (1.75–5.0 mm), aluminum alloy, and steel wires.
Q4: What is the maximum line speed and rotor speed?
A: Rotor speed up to 220 rpm (model dependent); line speed up to 320 m/min with excellent lay length uniformity.
Q5: Is online tension control and synchronization included?
A: Yes. Constant tension control and full MMI+PLC synchronization with pulling capstan and take-up ensure stable, high-quality production.
Q6: Do you provide installation and training in Saudi Arabia?
A: Yes. Full turnkey installation, commissioning, operator training (English), 24/7 remote diagnostics, and local spare parts support.
Inquiry Now
Contact our technical team today. Within 48 hours we will provide a detailed configuration proposal, ROI calculation, layout drawings, and reference cases from similar GCC projects.
Ready to upgrade your armoring and shielding production?
Inquiry Now — Let us deliver the high-speed Rigid Stranding Machine that powers your cable manufacturing success in Saudi Arabia and the GCC.
Rigid Stranding Machine
High-speed Rigid Stranding Machine (ST56 / ST63 Series) for armoring and shielding of medium and high-voltage power cables. Non-back twist rigid cage design with automatic bobbin loading and constant tension control.
Product SKU:
ST56-24B / ST63-30B
Product Brand:
RLB Machinery
Product Currency:
USD
Product Price:
Contact for Quote
Product In-Stock:
InStock
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