METHOD FOR MERCERIZATION ON COMPOSITE FIBER STRUCTURE OF POLYLACTIC ACID FIBER AND COTTON OR CELLULOSIC FIBER

摘要

PROBLEM TO BE SOLVED: To provide a method of effective mercerization on a composite fiber structure of polylactic acid fibers and cotton or cellulosic fibers, using caustic soda without using any special apparatus, and to provide a method for giving the composite fiber structure such dyeability as to enable dense dyeing and continuous dyeing.;SOLUTION: The method of effective mercerization, using an aqueous caustic soda solution, on a composite fiber structure containing at least polylactic acid fibers and cotton or cellulosic fibers is provided. In the method, the treatment process includes the step of treatment with an aqueous caustic soda solution, the step of washing the resultant structure, and the step of neutralizing the thus washed fiber structure; wherein the washing step just after the step of treatment with the aqueous caustic soda solution is conducted at 40°C or lower; the liquid temperature in the step of treatment with the aqueous caustic soda solution is 10-30°C; the temperature of the inside of the tank in the neutralizing step is 30-50°C; and the concentration of the caustic soda is 3-30 mass%; the treatment step may include, after the neutralizing step, a washing step, bleaching step, and further dyeing step (with a reactive dye, or vegetation dyeing).;COPYRIGHT: (C)2010,JPO&INPIT