Dye removal from denim scrap with a forced circulation kier
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United States of America Patent
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Issued Date -
Oct 19, 2006
app pub date -
Sep 25, 2002
filing date -
Sep 26, 2001
priority date (Note) -
Abandoned
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Abstract
A recyling process for liquid treatment of denim scrap comprising placing denim scrap on a support surface (50) to form a thickness of flat, layered denim scrap (7). To the top surface is applied a compression plat (56) to form the thickness of denim scrap into a compact cake (54). Then treatment liquid is passed through the interior of the compact cake (54) in a direction parallel to the surfaces of the scrap, the liquid passing between opposed surfaces of the denim pieces. The treatment liquid can be a solvent for oxidized indigo dye; an aqueous solution containing a desizing agent; an aquueous solution containing a reducing agent for indigo dye; a solution containing desizing and reducing agent; an aqueous solution containing a reducing agent for indigo dye; or a sequences of these liquids.
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