Additional information: Bleaching of acetate & triacetate(modified)

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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.


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