The effect of flats speed,especially higher flats speed,on card sliver quality was studied.Card sliver produced at seven flats speeds was tested with Uster AFIS.Test results show that over-high flats speed is not beneficial to removing impurities and neps of card sliver.The flats speed from 450 to 550 mm/min is the best for removing impurity;while a speed of 450 or 650 mm/min is the best for removing neps of card sliver.The 1 050 mm/min flats speed is the best for removing short fibers.Accordingly,the flats speed of 450 mm/min is the most advantageous to improve the comprehensive quality of card sliver.It is also found that installing back-web-cleaner is very helpful to remove neps.It is also favorable to reduce short fibers,thus increasing the average length.But it is not helpful to reduce impurities in the sliver.
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