Indigo dyeing process and apparatus and indigo dyed yarns and fabrics made thereby
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United States of America Patent
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Jul 19, 2022
Grant Date -
May 28, 2020
app pub date -
Jan 28, 2020
filing date -
Sep 12, 2016
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Abstract
Processes are disclosed which substantially eliminate the formation of oxidized indigo dye before and during dye application onto a natural fiber yarn or fabric while allowing the leuco-indigo dye molecule to diffuse fully into the natural fibers of the yarn where it can fix to the fibers prior to oxidation (i.e., exposure of the leuco-dyed yarns to oxygen). Indigo dyed textile products (e.g., dyed cotton yarns that may be twill woven to form a denim fabric) exhibit exceptionally high colorfastness as determined by the AATCC Crock Test.
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