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Dyeing synthetic fibres - solid dyestuff extracted from a deposit by hot solvent dye liquor circulated through dye bath,
Dyeing synthetic fibres - solid dyestuff extracted from a deposit by hot solvent dye liquor circulated through dye bath,
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机译:对合成纤维进行染色-通过热染料溶液从沉积物中提取的固体染料,这些溶剂通过染浴循环,
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摘要
For dyeing with water insoluble dyestuff, the solid dyestuff is placed in a receptacle as a filter (cellulosic, glass fibre etc.) at atmospheric pressure, hot solvent is dropped on to it from an upper, heated container. When a sufficient quantity is in the lower part of the receptacle (heated or kept hot by a heat exchanger) it is admitted to the dyebath and circulated through a small circuit including the bath by a pump. Fresh dyestuff may be added from time to time from the receptacle. The liquor concentration may be increased by distillation from the receptacle. The liquor concentration may be thus increased from 1:20 to 1:5-1:3.
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