| 摘要 |
A recycling process for liquid treatment of denim scrap comprising placing denim scrap on a support surface to form a thickness of flat, layered denim scrap. To the top surface is applied a compression plate to form the thickness of denim scrap into a compact cake. Then treatment liquid is passed through the interior of the compact cake in a direction parallel to the surfaces of the scrap, the liquid passing between opposed surfaces of the denim pieces. The denim scrap is preferably cut into relatively uniform sizes having their largest dimension less than about 4 inches. The treatment liquid can be a solvent for oxidized indigo dye, whereby indigo dye is removed from the denim scrap by said liquid; an aqueous solution containing a desizing agent, whereby size is removed from the denim scrap pieces; an aqueous solution containing a reducing agent for indigo dye, whereby dye in the denim pieces is reduced to a soluble, leuco form, dissolves in the solution, and both size and dye are removed from the denim scrap pieces; a solution containing desizing and reducing agent, whereby size and dye is removed from the denim scrap pieces; or an aqueous solution containing a reducing agent for indigo dye, whereby dye in the denim pieces is reduced to a soluble, reduced form, dissolves in the solution, and is removed from the denim scrap pieces; or a sequences of these liquids.
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