Dyeing process

Details Dyeing process Dyeing process

1974-03-13

1976-03-16

Hoke, V. P.

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 81, 210 60, 210 62, D06P 168

Patent

active

039443833

ABSTRACT:
In the dyeing process of fibrous materials wherein the materials are contacted with a heated aqueous dye medium, the dye removed and the dyed material rinsed, the improvement wherein the aqueous dye containing medium and preferably the dye containing rinses are sent to a treating zone maintained at a pH of at least 7 and treated with an alkali earth metal hypochlorite such as calcium hypochlorite and aluminum sulfite whereby the treated mixture settles into an upper clear aqueous phase and a bottom colored phase, residual chlorine is removed from the clear aqueous phase and the resulting clear aqueous phase passed in heat exchange relationship to the aqueous dye containing material directed to the treating zone and returning the clear, chlorine-free water to the dyeing operation.

REFERENCES:
patent: 3649493 (1972-03-01), Meiners et al.
patent: 3806316 (1974-04-01), Lewkowitz et al.
patent: 3807947 (1974-04-01), Lasas
patent: 3829380 (1974-08-01), Oohara

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