Effect of flat speed of a card on fiber length distribution of strips

The relation between flat speed of a card and fiber length distribution of strips was studied.The fiber length distribution of strips which were produced under 9 kinds of flat speed was tested by Roller Fiber Length Measurement Instrument.The results show that the flat speed has great effect on fiber length distribution of strips,and the higher the flat speed,the more the long fiber content,and the short fiber content is lessened accordingly.Long fibers filled in flat can′t be transferred easily and they are transferred to cylinder for longer time during carding by the cylinder and flat.Based on the relation between flat speed and fiber length distribution of strips,it is concluded that flat speed shouldn′t be too high,usually less than 450 mm/min is suitable.