Process for continuous dyeing in a single operation of cellulose-containing yarn with indigo
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Jul 24, 1997
filing date -
Jul 25, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Continuous dyeing of cellulose-containing yarn with indigo in a single operation is disclosed, in that the reduced indigo from an aqueous dye liquor containing reducing agents, alkali, and additionally a further dissolved alkali metal salt in a concentration of 200 to 350 g/l as the electrolyte, and whose pH value has been adjusted to 10.2 to 11.3, is applied to the yarn. The reduced indigo absorbed by the fibers is oxidized again to pigment while maintaining the high concentration of electrolyte, and the dye process is finished in the customary manner.
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