Additional information: Bleaching of wool
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1. DESCRIPTION OF TECHNIQUES, METHODS AND EQUIPMENT
Wool is bleached with hydrogen peroxide (sodium hypochlorite may discolour and damage the wool). An additional reductive bleaching is, however, indispensable for achieving high levels of whiteness (full bleach). A typical reductive bleaching agent is sodium dithionite (hydrosulfite), which is often used in combination with optical brighteners to enhance its effect.
In the oxidative bleaching step, however, hydrogen peroxide is applied in the presence of alkali and stabilisers, which slow down the decomposition of the hydrogen peroxide.
Ehen wool has been previously submitted to an anti-felt treatment it is preferable to use hydrogen in weakly acid conditions.
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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