Method of and an apparatus for measuring characteristic features of fibrous material

Abstract

The present method relates to the measurement of fibrous material, such as slivers and rovings, by ultrasonics. By a suitable arrangement of a sound source and a sound pick-up with the fibrous material disposed therebetween, only those sound waves arrive at the sound pick-up which have penetrated the fibrous material. All lagging disturbing signals which are generated by reflections and interferences are suppressed by the pulsed operation of the sound source and by the corresponding gating of the sound pick-up, as a result of which, the value to be measured, namely, the quantity of fibers present at any time in the measuring data, is substantially free from disturbing influences. This measured value may be used as a value for the cross-sectional regularity, or as a controlled variable for the production of regular rovings or slivers. The fineness and quantity of the fibrous material which is being considered may be simultaneously determined by the joint evaluation of damping and propagation time delay of the sound waves which are used. This measured value may be used as a value for the fiber fineness, or as a controlled variable for the production of regular fiber mixtures of fiber bales of a different origin.

Dependencies are inferred from the claim text.