Bleaching and dyeing; fluid treatment and chemical modification – Measuring – testing – or inspecting dye process
Patent
1993-05-28
1994-11-22
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Measuring, testing, or inspecting dye process
8504, 8676, 8680, 8917, D06P 500
Patent
active
053665112
ABSTRACT:
A process for the dyeing of a fibrous article containing wool with an anionic dye and products processed thereby. The process includes immersing the article in a dyeing bath of a liquid solvent for the anionic dye. The liquid solvent and the article are heated to a temperature at least equal to the dyeing transition temperature. At least a portion of the dye is added as a miscible liquid concentrate while the solvent and the article are up to temperature. Stirring of the bath during the dye addition period and while the solvent and article are up to temperature is done to mix the dye concentrate with the solvent to form a dilute dye solution and to provide a flow of the dilute dye solution relative to the article to cause, on the average, essentially uniform dye transport of the anionic dye to the article. The dye addition rate is adjusted so that the dye addition rate is the primary control over the rate of dye uptake by the article.
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Holfeld Winfried T.
Mancuso Dale E.
E. I. Du Pont de Nemours and Company
Einsmann Margaret
Lieberman Paul
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