Preparatory for synthetic fifbres

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Preparatory for synthetic fifbres

  1. 1. PREPARATORY FOR SYNTHETIC FIFBRES <ul><li>Synthetic fibres: No natural impurites </li></ul><ul><li>Added impurities: spin finishes, antistatic agents t improve physical and mechanical properties during spinning, weaving and knitting. </li></ul><ul><li>Other impurities: Dirt, Sighting/tinting colours to identify different fibre grades. </li></ul><ul><li>Objective </li></ul><ul><li>To remove dirt, size, process lubricants and sighting colours. </li></ul>
  2. 2. SCOURING OF SYNTHETIC FIBRE FABRICS <ul><li>Scouring of polyester and Nylon </li></ul><ul><li>A separate step of desizing is not essential in case of synthetic yarn. Water soluble PVA is most commonly used for sizing. </li></ul><ul><li>Scouring bath </li></ul><ul><li>Soda ash 2-3 g/l </li></ul><ul><li>Non inoic detergent 1-2 g/l </li></ul><ul><li>Temp. 70-80 deg. C </li></ul><ul><li>Time 30-60 min. </li></ul><ul><li>Scouring of acrylic </li></ul><ul><li>Acrylic tends to yellow in alkaline solution at high temp. </li></ul><ul><li>Scouring is carried out with alkali under in presence of non-ionic detergent above conditions </li></ul>
  3. 3. SCOURING OF PET/COTTON BLENDS <ul><li>Scouring is mainly designed for the removal of natural impurities from cotton </li></ul><ul><li>Conditions of scouring are milder to avoid alkaline hydrolysis of polyester </li></ul><ul><li>Scouring may be carried our either batch or continuous processes using equipments like jigger or J-box </li></ul>
  4. 4. SCOURING OF PET/COTTON BLENDS <ul><li>Scouring conditions </li></ul><ul><li>Caustic soda 3% owf., 1-2 g/l anionic detergent, 70 deg. C, 90 min OR 100 deg.C for 30 min. </li></ul><ul><li>Soda ash 10 g/l, anionic detergent 1-2 g/l, 100 deg. C, 60 min </li></ul><ul><li>Caustic soda 2 g/l, Soda ash 5 g/l/ anionic detergent 1-2 g/l, 75 deg. C for 60 min. </li></ul><ul><li>H2O2 Bleaching </li></ul><ul><li>H2O2 10 g/l, Soda ash 2 g/l, Sod. Silicate 3-5 g/l </li></ul><ul><li>Temp 80 deg. C Time 60 min. </li></ul><ul><li>Each treatment followed by hot and cold water washing </li></ul>

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