Quantifying Anti Friction Lubricant Protection Limits for Elastane Cores under High Drag Jet Processing
Sustaining a 1.8 percent ester lubricant film on elastane cores prevents elastomeric rupture when jet nozzle pressure exceeds 2.2 bar.
Thermal Oxidative Stability
Chemical Endurance
Resistance of textile lubricants, spin finishes, and synthetic fibers to decomposition and oxidation when exposed to high temperatures in the presence of air determines their suitability for high-speed industrial processing. High thermal oxidative stability prevents the formation of tar, resin, or smoke during high temperature heat setting and texturizing. This property is evaluated using differential scanning calorimetry and thermogravimetric analysis.
Lubricant Performance
Textile machinery running at high speeds generates high heat at the metal contact points. If the lubricant lacks thermal oxidative stability, it will oxidize to form sticky deposits that clog the machinery and cause yarn breakage. Using high quality synthetic lubricants avoids this issue and maintains smooth operation.
Fiber Processing
Synthetic yarns like nylon and polyester undergo high-temperature drawing and texturizing to lock in their crimp. The finish applied to these fibers must have high thermal oxidative stability to protect the filaments from melting or discoloring. This thermal protection ensures that the yarn remains white and dyeable.
Testing and Standards
Laboratories simulate processing conditions by exposing lubricant samples to hot air ovens for extended periods. Evaluating the change in viscosity and acid value after exposure determines the thermal oxidative stability of the lubricant. Formulations that resist oxidation are selected for high speed synthetic fiber production.