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Latest revision as of 12:35, 1 March 2013
Back to Bleaching of acrylic, polyamide & polyester
BLEACHING OF CHEMICAL FIBRES
1. DESCRIPTION OF TECHNIQUES, METHODS AND EQUIPMENT
Chemical fibres usually are already white when bought. However, to achieve full-white, bleaching is necessary. In addition, yellowing can occur after heat-setting.
Both reductive and oxidative bleaching can be applied.
Reductive bleaches:
- sodium dithionite
- sodium- and zinc-formaldehyde
Oxidative bleaches:
- sodium chlorite (except for polyurethane)
NOT suitable for chemical fibres:
- H2O2
- hypochlorite
- potassium permanganate
Chemical fibre bleaching is carried out in full bath, not with steam – as sometimes applied to natural fibres.
continuous bleaching: f.ex. “boot plant” (Stiefel Anlage)
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.
