Process of scouring and bleaching dyed and undyed cellulose textiles
阅读：648发布：2024-01-18
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7. A METHOD OF BLEACHING TEXTILES CONTAINING FIBERS SELECTED FROM THE GROUP CONSISTNG OF COTTON AND LINEN COMPRISING CONTACTING SAID FIBERS WITH AN AQUEOUS SOLUTION OF FRM 0.1 TO ABOUT 2.0 PERCENT BY WEIGHT OF THE SOLUTION OF A MEMBER OF THE GROUP CONSISTING OF SODIUM CARBONATE AND SODIUM HYDROXIDE, SAID SOLUTION CONTAINING AMMONIUM HYDROXIDE IN A CONCENTRATION OF FROM 0.1 TO 1.3 PERCENT BY WEIGHT OF THE SOLUTION AND BEING AT A PH OF BETWEEN 9 AND 11.5 AND AT TEMPERATURES OF BETWEEN 160* F. TO 250* F., PARTIALLY BLEACHING THE FIBERS AFTER SAID CONTACT WITH AN ALKALINE SOLUTION OF SODIUM HYPOCHLORITE HAVING PH OF BETWEEN 9 AND 12, SOURING THE PARTIALLY BLEACHED
8. A METHOD OF TREATING TEXTILES CONTAINING FIBERS OF THE GROUP CONSISTING OF COTTON AND LINEN AND HAVING DYED PORTIONS WHICH BLEED IN PEROXIDE BLEACHING SOLUTIONS COMPRISING CONTACTING SAID TEXTILES WITH AN AQUEOUS SOLUTION OF FROM 0.1 TO ABOUT 2.0 PERCENT BY WEIGHT OF THE SOLUTION OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF SODIUM CARBONATE AND AMMONIUM HYDROXIDE IN A CONCENTRATION OF FROM 0.1 TO 1.3 PERCENT BY WEIGHT OF THE SOLUTION AT A PH OF BETWEEN 9 AND 11,5 AND AT TEMPERATURES BETWEEN 160* F. TO 250* F., PARTIALLY BLEACHING THE TEXTILES AFTER SAID CONTACT WITH AN ALKALINE SOLUTION OF SODIUM HYPOCHLORITE AT A PH OF BETWEEN 9 AND 12, SOURING THE PARTIALLY BLEACHED TEXTILES WITH AN AQUEOUS BISULFITE SOLUTION HAVING A PH BETWEEN 1 TO 5, AND CONTACTING THE BISULFITE TREATED GOODS WITH AN AQUEOUS SOLUTION OF HYDROGEN PEROXIDE AT A PH OF BETWEEN 8.5 AND 11.
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