In medium- and high-voltage power cable production, rigid stranding is the preferred technology for creating compact, mechanically strong armoring layers and shielding structures. The RLB Rigid Stranding Machine (ST56 and ST63 series) is a heavy-duty non-back twist strander engineered specifically for high-efficiency armoring with copper wires, round aluminum wires, pre-twisted sector conductors, and steel wires. It is also widely used for manufacturing copper wire shielded cables and copper tape shielding cables, delivering superior roundness, uniform lay length, and excellent long-term cable performance.
Brief Technological Process
Central Payoff → Rigid Cage Rotation → Precision Compaction → Take-Up Payoff reels (automatic side or front loading) → Rigid cage with multiple bobbins → Non-back-twist stranding at high rotational speeds (up to 550 rpm) → Precision die holder for round/sector compaction → Meter counter and dual-wheel capstan → Automatic take-up bobbin.
The concentric rigid design ensures smooth wire path, constant tension, and perfect synchronization between mechanical and electrical systems for stable, high-speed operation.
Core Technical Advantages & Operational Benefits
Engineered for the demanding GCC climate and high-volume armored cable production, the RLB Rigid Stranding Machine offers measurable performance advantages:
- True Non-Back Twist Rigid Stranding: Ideal for armoring and large-section conductors where stability, compactness, and mechanical strength are critical.
- Automatic Bobbin Loading: Side-lower or front automatic loading mechanisms (customizable) for faster changeovers, reduced labor, and minimal downtime.
- Constant Tension Control: Aerodynamic resistance combined with electromagnetic brakes provides precise, automatic tension compensation from full to empty bobbin.
- Robust Ground Shaft Drive System: Independent AC motors per cage ensure perfect electrical synchronization and stable high-speed operation with low noise and maintenance.
- Intelligent MMI + PLC Control: Easy pre-setting of stranding pitch, direction, tension compensation, and full synchronization with pulling capstan and take-up unit.
- Versatile Material Handling: Handles copper (1.5–3.6 mm), aluminum (1.75–5.0 mm), aluminum alloy, and steel wires with loading weights up to 1200 kg.
These features result in higher output, lower scrap rates, reduced energy consumption, and consistent high-quality armored and shielded cables compared to traditional planetary or tubular stranders.
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.
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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