PURPOSE: To obtain pure-white, tough and soft jute fibers by bleaching jute fibers at low temperature, washing with water, treating with lactic acid, an organic acid and a lactic acid fermentation solution, opening.

CONSTITUTION: Cultivated jute is collected, immersed in water, fermented and decomposed, bleached with water and lignin and tannin are removed from the jute with caustic soda and a peroxide. The dehydrated jute fibers are retreated with a peroxide, sodium percarbonate and a caustic alkali and centrifuged. The filtrate is electrolyzed, mixed with hydrogen peroxide and the jute fibers are bleached with a ClO2- solution as a bleaching solution and repeatedly dehydrated and washed with water. The jute fibers are treated with a lactic acid solution or a fermented lactic acid and optionally a monochloroacetic acid, dehydrated, washed with water and single fibers are opened in water by a combing and carding machine. The jute fiber is mixed with silk fiber and synthetic fiber, twisted, made into cloth or woven fabric and dyed or printed.