Additional information: Dyeing of viscose, cupro & modal(regenerated)

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DYEING OF NATURAL POLYMER FIBRES


1. DESCRIPTION OF TECHNIQUES, METHODS AND EQUIPMENT


Cellulose acetate (CA) and cellulose triacetate (CT)

In contrast to the other regenerated cellulose fibres, CA and TC are hydrophobic and therefore they can be dyed with disperse dyes under conditions which are very similar to those applying to PES fibres.

Cellulose acetate is dyed by the exhaustion method with disperse dyes in the presence of non-ionic or anionic dispersing agents in weakly acidic conditions (pH 5-6). Dyeing is normally done at 80-85°C. However, a series of less wetfast dyes already absorb onto the fibre at 50-60°C, whereas more wetfast dyes require temperatures up to 90°C.

Compared to CA, CT dyeing and finishing characteristics are more similar to purely synthetic fibres. CT, like Ca, is dyed with disperse dyes in a weakly acidic medium in the presence of levelling auxiliaries. Applied dyeing techniques for CT are: - batch dyeing process, usually at 120°C, but if these conditions are not possible a dyeing accelerant (based on butyl benzoate or butyl salicylate) is required. - thermosol process


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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