Identification Of Cashmere And Wool Fibers With Dyeing Method Using Lanasol Reactive Dye

On the basis of the previous work on identification methods of cashmere and wool fibers,the proper process conditions are determined in terms of orthogonal test method for appearance of maximum colour diffenence between cashmere and wool fibers dyed with Lanasol reactive dye as follows: 2%(owf) of the reactive dye; 2%(owf) of the ammonium sulphate; 2%(owf) of the Albegal B; pH=5.3; 1:25 of the bath ratio;the hooding temperature at 90℃and the heat retaining time for 20min.Based on the difference in microscopic structure and morphology of cashmere and wool fibers,the reasons are approached for the resultant color difference between cashmere and wool in the mixed fibers dyed by the reactive dye in the same bath.The approximate variation of the cashmere contents with the absorbance of the residual liquor from the dyed mixed fibers of cashmere and wool is obtained from the method of the least squares.Using this fitting equation, the contents of cashmere in the mixed fibers can be determined from the absorbance of the residual liquor.The attribution for variance fibers to cashmere or wool in mixed fibers is easily given by observations using optic microscope after the mixed fibers are dyed with the reactive dye.