Method for the treatment of aramid material and fiber, yarn, and fabric made thereby

Abstract

This invention relates to a method for providing a dyed meta-aramid material, wherein said method comprises at least a step of pretreatment of the material and a subsequent step of dyeing the material, characterized in that the step of pretreatment is carried out under closed conditions, in the presence of an aqueous medium, and at a target temperature of 80 to 130° C. This invention also relates to fibers, yarns, and fabrics obtained from this method.

1 . A method for providing a dyed meta-aramid material, wherein said method comprises at least a step of pretreatment of the material and a subsequent step of dyeing the material, characterized in that the step of pretreatment is carried out under closed conditions; in the presence of an aqueous medium; and at a target temperature of 80 to 130° C. 
     
     
         2 . The method of  claim 1 , further comprising a step of scouring the material prior to the step of dyeing the material. 
     
     
         3 . The method of  claim 2 , wherein said step of pretreatment is made after the step of scouring. 
     
     
         4 . The method of  claim 2 , wherein the step of scouring and the step of pretreatment are combined in a same bath. 
     
     
         5 . The method of  claim 2 , wherein the step of scouring is carried out in an aqueous medium at a pH between of 6 to 10. 
     
     
         6 . The method of  claim 1 , wherein the material is a fiber, a yarn including said fiber, or a fabric including said yarn. 
     
     
         7 . The method of  claim 1 , wherein the step of pretreatment comprises a pre-phase of heating the aqueous medium to the target temperature and a main phase where the target temperature is maintained constant. 
     
     
         8 . The method of  claim 7  wherein the duration of the main phase of the step of pretreatment is from 30 minutes to 60 minutes. 
     
     
         9 . A fiber obtained by the method of  claim 1 . 
     
     
         10 . A yarn obtained by the method of  claim 1 . 
     
     
         11 . A fabric obtained by the method of  claim 1 .