Bleaching of cotton and bast fibres

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  • Cotton bleaching Flowsheet


a) Typical wet processing for fabrics


Cotton bleaching Flowsheet1.jpg

source: BAT 2003


b) Typical process sequence for the finishing of cotton knitted fabric


Cotton bleaching Flowsheet2.jpg


c) Typical process sequence for the finishing of cotton woven fabric


Cotton bleaching Flowsheet3.jpg


  • Typical parameters of the process
Techniques Temperature [°C] Pressure (bar) Heat transfer medium Residence Time pH Bleaching agent Costs & time need Literature
Jigger water H2O2 both highest for discontinous process Lexikon der Textiolveredlung
Pad-Roll process 95 water shorter
Pad- Roll process 80 water longer than at 95°C
Cold baths the lower, the longer is residence time water peroxide cold processes: time need is very high, energy costs low
Cold baths cold water H2O2 persulfate (Na2S2O8)
Cold extraction-process (BASF) cold water
HT- or pressure steaming 130-140 steam 45-120s
middletimebleaching: more widely applied steam 10-20min
shorttimebleaching steam 1-3min with H2O2 in open steamers with overheated steam


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