Difference between revisions of "Bleaching of cotton and bast fibres"
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Latest revision as of 12:16, 1 March 2013
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- Cotton bleaching Flowsheet
a) Typical wet processing for fabrics
source: BAT 2003
b) Typical process sequence for the finishing of cotton knitted fabric
c) Typical process sequence for the finishing of cotton woven fabric
- 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 |