Additional information: Bleaching of flax

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1. DESCRIPTION OF TECHNIQUES, METHODS AND EQUIPMENT


Flax contains 25-30 % more non-cellulose matter than cotton. Therefore complicated processes are needed to achieve full-white.

possible processes
1.) pre-bleaching at pH 11.5 in bath
2.) addition of sodium chlorite at pH 5.5 and 65°C to bath
widely used
4-step process:
1.) alkaline cooking
2.) alkaline bleaching with hypochlorite
3.) chlorite bleaching
4.) peroxide bleaching
LOK-process (Degussa)
1.) sodium chlorite bleaching
2.) H2O2 bleaching
Ravensburger process
1.) broth
2.) bleaching with aqueous chlorine dioxide-solution
3.) H2O2 bleaching
4.) hypochlorite bleaching


2. NEW TECHNOLOGIES'


a) Changes in the process

No information is available.

b) Changes in the heat supply system

No information is available.

c) Changes in the energy distribution system

No information is available.


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