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A method for continuous dyeing of cellulosic yarn with indigo in one single step under control of the ph - value
A method for continuous dyeing of cellulosic yarn with indigo in one single step under control of the ph - value
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机译：在ph值控制下一步一步用靛蓝连续染色纤维素纱的方法。
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摘要
A method for continuous dyeing of cellulosic yarn with indigo in one single step, wherein the reduced indigo from an aqueous dyeing liquor is applied to the yarn, the reducing agents, alkali and, in addition, a further dissolved alkali metal salt as electrolyte contains, characterized in that the electrolyte in a concentration of from 100 to 200 g / l and the ph - value of the dye liquor to 10,2 to 11,3 is set, that the yarn is subsequently, while maintaining of the electrolyte concentration is exposed to a gas, which is located, in an aqueous medium with the formation of an acid, and in that the on the fiber reduced indigo then drawn back to the pigment is oxidized and the dyeing in a conventional manner is completed.
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