Bow Stranding Machine

Bow-type Cabling Machine (Skip Strander)

1. Product Overview

The Bow-type Cabling Machine is a high-efficiency equipment used in the wire and cable industry for twisting multiple insulated cores (typically 2 to 5 cores) into a finished cable. This machine is a preferred solution for the cabling process of power cables, control cables, and various multi-core industrial cables.

2. Core Working Principle

Stationary Pay-off: Unlike traditional cage-type stranders, the pay-off bobbins are fixed on the ground or inside the frame and do not rotate. This allows for the use of very large bobbins and simplifies loading/unloading.

Rotating Bow: The insulated cores are pulled from the stationary bobbins and guided into a lightweight "bow" that rotates rapidly around the bobbins. The rotation of the bow creates the twist (lay) as the cores meet at the closing die.

Low Inertia Operation: The rotating bows are often made of high-strength composite materials or carbon fiber. This significantly reduces rotational inertia, allowing for much higher RPMs compared to heavy, traditional cages.

3. Key Technical Features

High Speed & Productivity: Due to its lightweight rotating parts, the production speed of a skip strander is typically several times faster than that of a cage-type cabling machine of similar specifications.

Large Bobbin Capacity: Since the pay-off stands are stationary, the machine can easily accommodate bobbins with diameters of 1250mm, 1600mm, or even larger, drastically reducing the frequency of spool changes.

Stable Tension Control: Pay-off tension is usually managed by pneumatic or electromagnetic braking systems, ensuring constant tension even during high-speed operation, which is critical for cable quality.

Simplified Maintenance: The structure is relatively simple with fewer wearing parts (no complex planetary gears or support rollers for cages), leading to lower maintenance costs and higher uptime.

Advanced Automation: Modern bow stranders are equipped with PLC control systems to precisely manage lay length (pitch), line speed, and tension synchronization.

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