Cotton Yarns in Continuous Wet Processing Engineering
Continuous wet processing of cotton yarns demands precise control of yarn structure, swelling draft, liquor application, and transport tension to assure performance.
Peroxide Stabilizer
Radical Management
Chemical buffering agents regulate the rate at which hydrogen peroxide releases oxygen during the bleaching process. Without a peroxide stabilizer, the rapid and uncontrolled decomposition of the bleach would lead to inefficient whiteness and severe damage to the cotton fibres. These agents maintain the bleaching power of the bath over an extended period.
Decomposition Control
Silicates or organic sequestering agents are used to prevent heavy metal ions from triggering a chain reaction of oxygen release. If the peroxide stabilizer is absent, even trace amounts of iron or copper can cause the peroxide to break down into highly reactive hydroxyl radicals. These radicals attack the cellulose chains and reduce the degree of polymerization which leads to weakened fabric and potential holes.
Fibre Protection
Maintaining the tensile strength of the fabric requires a balance between bleaching activity and fibre safety. A peroxide stabilizer ensures that the bleaching action is concentrated on the natural pigments of the cotton rather than the structural integrity of the fibre itself. This protection is verified through fluidity tests or tensile strength measurements after processing.
Bleaching Efficiency
Whiteness levels are more consistent when the oxygen release matches the speed of the chemical reaction with the impurities. By slowing down the process, the peroxide stabilizer allows for deeper penetration of the bleaching liquor into the yarns. The resulting fabric has a higher and more uniform brightness.