Microbial and steam explosion united technique in hemp degumming

To shorten the duration of hemp degumming and increase the fiber quality,microbial and steam explosion united degumming technique was studied.Based on the existing technique of microbial retting and the choice parameters of steam explosion,microbial and steam explosion united technique was deemed to be the better technique order.The single-factor and orthogonal tests were performed during the steam explosion experiment.The components and qualities of the degumming hemp were tested finally.The results indicated the best united-degumming conditions were: during the microbial retting,hemp was incubated with Dm111 strain at 35 ℃ shaking-flask 180 r/min for 6 h.And the steam explosion was performed in a holding-time of 120 s a nd a pressure of 2.5 MPa.The analysis data showed that the cellulose of degumming hemp was 77.01%,and the pectin,hemicelluloses and lignin were removed by 89.15%,33.75% and 30.64%,respectively.The degree of fiber separation was 689 m/g and the strength of fiber was 80 N.This technique shortened the degumming time and produced better hemp fiber.