Indigo dye process
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United States of America Patent
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Jan 3, 1995
Grant Date -
N/A
app pub date -
May 10, 1993
filing date -
May 10, 1993
priority date (Note) -
Expired
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Abstract
An improved nonpolluting method of dyeing fibers or fabric, including natural cellulose fibers such as cotton or linen, using indigo dye. The improved process includes pretreating the fibers with a mordant solution, preferably a natural nonpolluting mordant solution. The fibers are then treated with a reduced indigo liquor in an inert atmosphere, preferably nitrogen. The indigo is then oxidized by flooding the dyed fabric with cold water. This indigo dye process can be adapted to conventional garment, package and piece dye processes and machinery, which has not been possible with existing indigo dye processes. The improved process results in a more consistent and even dyed material which is color and washfast.
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