Removal of excess dye from new textiles
AssigneeNovo Nordisk A/S
InventorsGitte Pedersen, Michael Schmidt
Life of this patent
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Abstract
Dye leached from dyed or printed textiles in an aqueous solution can be decolorized by adding enzymes that utilize hydrogen peroxide or molecular oxygen for the oxidation of organic or inorganic substances, including colored substances, together with a source of H.sub.2 O.sub.2 or O.sub.2. Such enzymes are usually termed peroxidases and oxidases, respectively. This treatment reduces the risk of back-straining (redeposition of dye onto textile) even when less water is used. The enzymatic bleaching of released dyestuff will decrease process time as well as the amount of energy and water needed to achieve a satisfactory quality of the textile, and the color of the waste water is reduced.
Claims15
A process for removing excess dye from a newly manufactured printed or dyed fabric or yarn, comprising treating said fabric or yarn with a wash liquor containing (a) an enzyme exhibiting peroxidase activity and a suitable source of H.sub.2 O.sub.2 Or (b) an enzyme exhibiting a suitable oxidase activity and a source of O.sub.2.
A process for simultaneously removing excess dye from and forming localized color variation on a fabric, comprising treating said fabric or yarn with a wash liquor containing (a) an enzyme exhibiting peroxidase activity and a suitable source of H.sub.2 O.sub.2 or (b) an enzyme exhibiting a suitable oxidase activity and a source of O.sub.2, wherein the wash liquor further contains a cellulase and/or pumice.
A process for simultaneously removing excess dye and starch size from a fabric, comprising treating said fabric or yarn with a wash liquor containing (a) an enzyme exhibiting peroxidase activity and a suitable source of H.sub.2 O.sub.2 or (b) an enzyme exhibiting a suitable oxidase activity and a source of O.sub.2, wherein the wash liquor further contains an .alpha.-amylase.
Dependencies are inferred from the claim text.