3.FA478 increases the itinerancy pneumastic suction motion ,it makes the roving yarn evenness to improve.
FA478还增加了巡回式吹吸风装置,使粗纱条干均匀度明显提高。
4.The thesis explain the production process and process specification of the raw material pretreatment, scutching. dressing. drawing. roving. spun yarn.