ON THE MEASUREMENT OF SMALL FIBER ASSEMBLIES FLYING IN PNEUMATIC CONVEYOR PIPE

Abstract

In the present study, an apparatus for the continuous measurement of the size and the interval of fiber assemblies flying at a high-speed air flow was first devised and its performance was investigated. Further, as an example of applying it in practice, the behavior of assemblies was measured by separating a sliver continuously by suction.It is believed that by developing this study further, the basic information will be obtained on the clustering condition of fibers, which is importont in the pneumatic spinning, pneumatic conveyance, carding, etc.The results obtained from this experiment are summarized as follows(1) It is possible to measure the size of fiber assemblies flying with high speed by use of a capacitance type detector (Fig. 1).(2) This apparatus enables one to detect a cluster composed of about 5-6 filaments of 3D, 2 in-cut viscose fiber.(3) When a sliver, going out from the front roller after roller drafting is separated by suction, the intervals of separation is distributed nearly in accordance with an exponential distribution. The number of assemblies separated per unit time is subjected to a Poisson's distribution. The size of assemblies can be found from the average time intervals of the separation.(4) The larger the roller draft ratio and the faster the suction speed, the more easily the sliver is separated into smaller assemblies.