| 摘要 |
Cellulosic substrates are treated with alkali (e.g. mercerised) and reactive dye (e.g. of the "cold-dyeing" type), in either- (a) a two-liquor process in which padding with alkali and padding or printing with reactive dye are effected in either order but without intermediate washing (or, preferably, drying); or- (b) a one-liquor process comprising padding with alkali and reactive dye, preferably to give a weight increase of 55-200% based on the dry weight of the substrate. The treatments are preferably effected at 10-100 DEG C in "Flex Nip" apparatus and may be followed by a dye fixing step. The alkali treatment liquor may contain complexing, lubricating, wetting or bleaching agents or alkali metal silicate, and part of the alkali may be replaced by alkali metal salt. The dyeing liquor may contain urea or retention, foam hindering or wetting agents.
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