Abstract: In order to avoid the serious environmental pollution from chemical degumming, the combined mechanical and enzyme degumming of cotton bast fiber was suggested. During the combined mechanical and enzyme degumming, the results of orthogonal design was optimized by fuzzy mathematical theory, solved the question when optimization conditions of two evaluation targets were variance, indicated the optimization condition enzyme density 6%, pH 4.4, temperature 60℃, time8 hour, glue remnant rate was 8.09% , lignin remnant rate was 9.64%. The structure and morphology of degummed fiber were discussed by FTIR、SEM and XRD analysis, for the dyeing and production of cotton bast fibers.

Key words: cotton stalk bast, mechanical-enzyme degumming, fuzzy math orthogonal test, fiber structure