Process for continuous dyeing in a single operation of cellulose

Details Process for continuous dyeing in a single operation of cellulose Process for continuous dyeing in a single operation of cellulose

1997-07-24

1999-11-16

Einsmann, Margaret

Bleaching and dyeing; fluid treatment and chemical modification

Dye or potential dye composition, additive, treatment,...

Sulfur dye or vat dye

8650, 8918, D06P 122

Patent

active

059849800

ABSTRACT:
Continuous dyeing of cellulose-containing yarn with indigo in a single operation is disclosed, in that the reduced indigo from an aqueous dye liquor containing reducing agents, alkali, and additionally a further dissolved alkali metal salt in a concentration of 200 to 350 g/l as the electrolyte, and whose pH value has been adjusted to 10.2 to 11.3, is applied to the yarn. The reduced indigo absorbed by the fibers is oxidized again to pigment while maintaining the high concentration of electrolyte, and the dye process is finished in the customary manner.

REFERENCES:
patent: 4342565 (1982-08-01), Teague et al.
patent: 5514187 (1996-05-01), McFarland et al.
Vat Dyestuffs and Vat Dyeing, M.R. Fox, John Wiley & Sons Inc, 1948 pp. 80, 88, 1948.

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