Dyeing cellulosic fabrics - with vat dyes by pad-steaming process without intermediate drying

摘要

Continuous pad-steam dyeing of cellulosic material, esp. cotton, with vat-dyes, in which fabric web padded with vat-dye liquor is (i) squeezed to 40 - 120 wt.% liquid uptake (dry fabric = 100%); (ii) led, without intermediate drying, to a booster which permanently contains only sufficient reducing agent as is necessary for 10 - 150 m padded cloth and (iii) dyeing is fixed by pad-steaming. High quality dyeing are obtd. even with velvet or terry-cloth.