Method of decolorizing blue jeans based on client-desired design

Abstract

The present invention provides a method of decolorizing blue jeans based on a client-desired design. Hydrochloric acid (HOCl) and sodium chloride solution are provided to an electrolytic tub, and are electrolyzed to generate chlorine gas and hydrogen gas. Hypochlorous acid solution is separated from sodium hydroxide. Tapes are attached to the blue jeans to make a constant form. The tape-attached blue jeans are submerged in the hypochlorous acid to change a colorant of the blue jeans.

What is claimed is:  
     
         1 . A method of decolorizing blue jeans, comprising the steps of: 
 (a) providing and electrolyzing hydrochloric acid (HOCl) and sodium chloride solution to an electrolytic tub to generate chlorine gas and hydrogen gas, and separating hypochlorous acid solution from sodium hydroxide;    (b) attaching tapes to the blue jeans to make a constant form; and    (c) submerging the tape-attached blue jeans in the hypochlorous acid to change a colorant of the blue jeans.    
     
     
         2 . The method as recited in  claim 1 , further comprising a step of reacting hydrogen chloride gas with the sodium hydroxide solution to produce sodium chloride solution, 
 wherein the hydrogen chloride gas is generated by trapping and reacting the chlorine and hydrogen gases with each other.    
     
     
         3 . The method as recited in  claim 2 , wherein in the step (c), the colorant is oxidized and a reaction is made to change the hypochlorous acid to the hydrochloric acid.  
     
     
         4 . The method as recited in  claim 3 , wherein the changing the colorant is made in the electrolytic tub and a processing tub; and 
 wherein the producing the sodium chloride solution is made in the electrolytic tub and a scrubber,    further comprising a step of recycling the hydrochloric acid in the processing tub and the sodium chloride solution in the scrubber to the electrolytic tub.    
     
     
         5 . The method as recited in  claim 4 , wherein the steps are simultaneously performed and each of the steps is continuously performed.  
     
     
         6 . The method as recited in  claim 1 , wherein the changing the colorant is made at a temperature between 10° C. and 30° C.  
     
     
         7 . The method as recited in  claim 1 , wherein the sodium chloride solution provided to the electrolytic tub contains sodium chloride of 0.1-7% by weight.  
     
     
         8 . The method as recited in  claim 1 , before the step (c), further comprising a step of additionally colorizing the blue jeans with an oil-based colorant oxidized by the hypochlorous acid to make a constant form.  
     
     
         9 . A method of decolorizing blue jeans, comprising the steps of: 
 (a) providing and electrolyzing hydrochloric acid (HOCl) and sodium chloride solution to an electrolytic tub to generate chlorine gas and hydrogen gas, and separating hypochlorous acid solution from sodium hydroxide;    (b) additionally colorizing the blue jeans with an oil-based colorant oxidized by the hypochlorous acid to make a constant form; and    (c) submerging the tape-attached blue jeans in the hypochlorous acid to change a colorant of the blue jeans.    
     
     
         10 . The method as recited in  claim 9 , wherein the oil-based colorant is identical to a colorant colorized on the blue jeans and in the step (b), colorization amount is controlled at each part of the blue jeans through a plurality of control steps.