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It is very important that the cellulosic goods to be dyed are free of any processing chemical additives such as sizes, waxes, oils, peroxide, chlorine, or natural contaminates.  Do not exceed a pH of 9.0 when bleaching rayon as this will initiate saponification.  Bleaching processes may not be necessary for dull, earthtone, dark, navy, or black shades.

 

PreScour

  • Enter goods in bath containing:
  • Raise temperature to 185°-195°F(90°-93°C) and hold for 30 minutes.
  • Drop bath and rinse well.

 

Half-Bleach Bottom Procedure

Half-Bleach bottoms may be desired for pastel and bright shades where a full-bleach is not necessary.

  • Enter goods into a bleaching bath containing:
    • 3-4 % owg            Hydrogen Peroxide 35%
    • 1.0-1.5 % owg      Sodium silicate
    • 0.5 % owg            Sodium Hexametaphosphate
    • 0.5-1.0 % owg     Sodium Hydroxide
    • 0.5-1.0 % owg    Orcoterge ALK-N Conc™
  • Raise temperature to 185°-195°F(85°-91°C) and run for 1 hour.
  • Drop bath, rinse well, adjust pH to 6.5-7.5 and dry.

 

Full-Bleach Bottom Procedure

For a cleaner white on cellulosics a full-bottom bleach procedure may be required.  This requires a higher amount of Hydrogen Peroxide and an optical whitener may be included in the bleaching bath to enhance the white.

  • Enter goods into a bleaching bath at 80°-100°F(26°-38°C) containing:
    • 4-8 % owg          Hydrogen Peroxide 35%
    • 2-4 % owg          Sodium silicate
    • 0.25-0.5% owg Caustic Soda 50%
    • 0.25% owg        Peroxide Stabilizer
    • 0.5 % owg         Sodium Hexametaphosphate
    • 0.5-1.0 % owg Sodium Hydroxide
    • 1.0 % owg        Orcoterge ALK-N Conc™
    • 0.75-1.0 % owg Orco Synthrowite C-ALKS™
  • Raise temperature to 185°-195°F(85°-91°C) and run for 1 hour.

Drop bath, rinse well, and adjust pH to 6.5-7.5 .

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