Wool dyeing utilizing controlled dye addition

Details Wool dyeing utilizing controlled dye addition Wool dyeing utilizing controlled dye addition

D - Textiles, Paper

06

P

D06P 1/39 (2006.01) D06P 1/00 (2006.01) D06P 3/16 (2006.01) D06P 5/20 (2006.01)

Patent

CA 2135876

A process for the dyeing of a fibrous article containing wool with an anionic dye and products produced thereby. The pro- cess 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 solu- tion and to provide a flow of the dilute dye solution relative to the article to cause, on the average, essentially uniform dye trans- port 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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