Sliver Structure Analysis Applying Air Suction

Abstract

In order to study sliver structure by fracturing method, suction air was applied to the slivers. Slivers were separated into fibers and small fiber assemblies. The size of separated fiber assemblies flying in a transport tube was ensitively measured by a photoelectric method. The effects of the kinds of sliver and suction air velocity on the sliver separation behavior were observed. The distribution function of the number of fiber assemblies s parated within a short period of time exhibits Poisson's distribution. The distribution of separation time interval shows an exponential curve. Power spectrum indicates a tendency of "pink noise" and the autocorrelation fu ction decreases to zero after short period of time. From these results, it is concluded that the separation behavior within a short period of time is randomly independent of time. This suggests hat fiber assemblies arearranged atrandom along a short length of sliver. It was quantitatively shown that the size of fiber assemblies decreases with increasing drawing process. Comber roving consists of smaller fiber assemblies than card roving. As suction air velocity increases, large and medium size of fiber assemblies which could not be divided under the lower velocity are subdivided into smaller size. The aggregated structure of fibers in sliver is complex and is assumed tohave a multiple structure of fiber assemblies: