Method for changing the colour of a textile, fabric and garment

Abstract

The invention refers to a fabric finishing method suitable for changing the colour of a coloured fabric thereby providing a vintage look to the fabric. The invention refers also to the fabric obtainable by the above method and to a garment comprising such fabric.

1 . A method for changing the colour of at least a part of a coloured fabric comprising the following steps:
 a) providing said coloured fabric with one or more of an oxidizing agent, preferably selected from: perborate, persulfate, peroxide, permanganate, perchlorate, dichromate, chlorate, chlorite, bromate, nitrite ions, nitrate ions and/or salts containing the above ions;   b) heating the fabric obtained according to step a); and   c) subjecting at least a part of the fabric obtained according to step b) to a laser treatment;   wherein step b) comprises heating said fabric at a temperature comprised in the range of 110° C. to 250° C.   
     
     
         2 . The method according to  claim 1 , wherein the heating temperature is comprised in the range of 110° C. to 220° C. 
     
     
         3 . The method according to  claim 1 , wherein the heating temperature is comprised in the range of 160° C. to 200° C. 
     
     
         4 . The method according to  claim 1 , wherein heating step b) is carried out for a time of at least 20 seconds. 
     
     
         5 . The method according to  claim 1 , wherein said oxidizing agent is selected from nitrate ions and/or nitrate salts. 
     
     
         6 . The method according to  claim 1 , wherein said oxidizing agent is selected from hydrated nitrates. 
     
     
         7 . The method according to  claim 1 , wherein said fabric with one or more of an oxidizing agent is obtained by applying a composition comprising said one or more oxidizing agents to said fabric. 
     
     
         8 . The method according to  claim 7 , wherein said composition is an aqueous composition comprising an amount of said oxidizing agent in the range of 40 g/L to 200 g/L and/or an amount of wetting agent comprised in the range of 0.5 g/L to 20 g/L. 
     
     
         9 . The method according to  claim 1 , further comprising a drying step a′), said step a′) being carried out after step a) and before step b) and at a temperature comprised in the range of 80° C. to 220° C., the temperature of step a′) being lower than the temperature of step b). 
     
     
         10 . The method according to  claim 1 , wherein said laser treatment of step c) is carried out using one or more of the following laser parameters:
 a dpi value comprised in the range of 20 to 50;   a focal length comprised in the range of 80 to 148 cm;   a laser beam frequency of 5 kHz;   an energy per pulse comprised in the range of 450 to 650 W;   a jump speed is about 5150 μm/s; and   a jump delay comprised in the range of 50 to 300 μs.   
     
     
         11 . The method according to  claim 1 , wherein said coloured fabric is coloured with indigo and/or at least an indigoid dye. 
     
     
         12 . The method according to  claim 1 , wherein said coloured fabric includes cellulose-based fibres. 
     
     
         13 . The method according to  claim 1 , wherein a stone washing step d) is carried out after step c). 
     
     
         14 . The method according to  claim 1 , wherein said coloured fabric is part of a garment or apparel. 
     
     
         15 . A fabric as obtainable according to steps a) and b) as defined in  claim 1 , said fabric comprising an oxidizing agent. 
     
     
         16 . A fabric as obtainable according to the method of  claim 1 , comprising elastic yarns. 
     
     
         17 . A garment comprising the fabric according to  claim 15 . 
     
     
         18 . A method for increasing the colour fading of a laser treatment on coloured fabrics, characterized in that steps a) and b) as defined in in  claim 1  are carried out before said laser treatment in the absence of acid catalysts.