Synthetic Fibre Preparation Differences
topic
Synthetic staple fibres (polyester, nylon, acrylic) arrive as pre-opened tow or staple bales with controlled length (38–51 mm), no trash, and applied spin finish (0.15–0.25% finish on weight of fibre, FOF). Preparation requires: lower blow room intensity (no trash removal needed), card clothing adapted for synthetic (semi-rigid vs flexible for cotton), anti-static precautions (synthetic builds static charge, requiring 60–65% RH), and modified roller coverings. Polyester-cotton blends require intimate blending at the blow room level to achieve uniform blend ratio.
Role
Synthetic fibre preparation knowledge is increasingly important as polyester-cotton blends (60:40, 65:35) dominate global apparel yarn production. The preparation differences between cotton and synthetic fibres — particularly static, finish, and opening requirements — are a common source of quality problems when mills switch between fibre types without adjusting machine settings. Understanding these differences prevents production disruptions and quality failures during product transitions.