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Preparatory for synthetic fifbres
 

Preparatory for synthetic fifbres

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    Preparatory for synthetic fifbres Preparatory for synthetic fifbres Presentation Transcript

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