Silicone Coating
Silicone-based coatings applied to synthetic filaments provide essential lubrication and anti-static properties during high-speed extrusion. In the production of polyester and nylon yarns, polydimethylsiloxane spin finish creates a smooth surface that protects the delicate fibres from mechanical damage. This chemical treatment is the primary tool for managing yarn tension in the mill.
Chemical Property
The molecular structure of the silicone allows it to spread evenly and form a thin, durable film. Because polydimethylsiloxane spin finish is chemically stable and heat resistant, it does not smoke or degrade during the drawing and texturizing processes. It remains effective even when the yarn travels at several thousand metres per minute.
Process Integration
Success in subsequent knitting or weaving operations depends on the correct application of this finish. If the polydimethylsiloxane spin finish is applied unevenly, the yarn may experience surges in tension that lead to fabric defects like streaks or bars. Excessive silicone can also interfere with the adhesion of coatings or the performance of water-repellent treatments.
Mills use solvent extraction and infrared analysis to verify that the finish level remains within the target range for each batch. Maintaining this balance is an essential part of yarn quality management.
Surface Energy
Low surface tension makes the yarn more manageable but can cause issues with printing inks if the fabric is not properly cleaned. Removal of polydimethylsiloxane spin finish is a standard step in the preparation for dyeing. It is a fundamental component of synthetic fibre manufacturing.
