How to coil fibers on a direct-melting coil

Fibers drawn from a direct-melt process should be coiled carefully using controlled tension and proper spooling techniques to prevent breakage and maintain uniformity.Preparing the Fiber

After fibers are drawn from the molten material, such as basalt or glass, ensure that the fiber ends are clean and free from debris. For optical or high-strength fibers, stripping any protective coating or outer layers may be necessary before coiling, but this should be done carefully to avoid damaging the fiber core (Holight Optic) .

Using Fiber Protection

Insert a fiber protection sleeve or guide to support the bare fiber during coiling. This helps prevent kinks, abrasion, or breakage during handling and ensures that the fiber maintains its structural integrity (Holight Optic) .

Coiling Technique

1. Loose Coiling: Arrange fibers in loose loops rather than tight spirals. This reduces stress and prevents micro-cracks or breakage. For branch or multi-fiber cables, coil each fiber once after completing a section to maintain order and prevent tangling (Holight Optic) .
2. Layering: When coiling onto a spool or tray, ensure that each layer is evenly distributed. Avoid overlapping fibers excessively, as this can create pressure points and lead to fiber damage.
3. Tension Control: Maintain consistent tension while coiling. Too much tension can stretch or break fibers, while too little can cause uneven winding and tangling. Automated coiling machines often include tension sensors to optimize this process.

Equipment Considerations

• Spools and Trays: Use spools or fiber trays designed for the fiber type. For high-temperature fibers like basalt, ensure the spool material can withstand residual heat from the direct-melt process (OptArray) .
• Guides and Rollers: Employ smooth, low-friction guides to direct fibers onto the coil. This minimizes abrasion and maintains fiber alignment.
• Cooling: Allow fibers to cool to a stable temperature before final coiling to prevent deformation or stress from thermal expansion.

Best Practices

• Coil fibers immediately after drawing to prevent tangling.
• Inspect fibers for uniform diameter and surface quality before coiling.
• For continuous production, integrate coiling with the fiber drawing line to maintain consistent speed and tension (Google Patents) . By following these steps—preparing the fiber, using protective sleeves, coiling loosely with controlled tension, and employing appropriate equipment—you can ensure high-quality fiber coiling in a direct-melting process, minimizing breakage and maintaining uniformity.