D - Textiles – Paper – 06 – L
Patent
D - Textiles, Paper
06
L
8/113
D06L 1/00 (2006.01) D06L 3/02 (2006.01) D06L 3/14 (2006.01)
Patent
CA 1060607
ABSTRACT OF THE DISCLOSURE A process for scouring, desizing and bleaching cotton greige goods comprises the steps of immersing the goods for a time sufficient to achieve commercial brightness in an aqueous solution having a temperature in the range from 100 to 212 degrees F. and consisting of from .3 to 704 by volume hydrogen peroxide, water and sufficient hydroxide to adjust the solution to a pH in the range above 2, the solution being substantially free of heavy metal ions and maintained out of contact with all metals while the goods are immersed therein and cycling a portion of the solution through a filtration means to remove solid impurities therefrom while maintaining the volume, composition and pH of the solution in contact with the goods substantially the same. In one embodiment, the goods are immersed in an alkaline scour solution for from 5 seconds to 3 1/2 minutes prior to bleaching in the hydrogen peroxide solution, the alkaline scour solution having a temperature in the range 160 - 212 degrees F. and a pH from 10 to 14. Still another embodiment of the invention includes the alkaline scour plus a brief acid scour, in any sequence, prior to bleaching in the hydrogen peroxide solution.
235953
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