| 摘要 |
<p>The regulation of the dye bath is obtained, whilst following the depletion of dyestuffs in the bath by photocolorimetry, by varying in two successive steps firstly a first parameter and then a second parameter different from the first, in such a way that the depletion of dyestuffs in the bath as a function of time follows substantially a predetermined curve. For the dyeing of cellulose materials by reactive dyestuffs, in the first step the content of electrolytes will be increased and then in the second step the content of alkaline agent will be increased. For the dyeing of wool and polyamide with soluble dyestuffs from a spent recycling bath at approximately 70 DEG C, the pH value will be raised from neutrality to approximately 5, and then the temperature will be raised to 100 DEG C, if necessary. <IMAGE></p> |
