Abstract
A new instrument is described for the measurement of folding twist on two-ply yarn for yarns in the range 6 to 35 turns per inch. In the system used, yarn is passed continuously through a mechanical detector consisting of a stylus that rests on the yarn and approximately measures its projected diameter. A photoelectric system converts the measured diameter into an electrical signal, which is electronically processed to give a digital count for each half twist in the yarn. This information is also presented as a curve that continuously monitors the twist and as a print-out of the number of half turns per 10-in. length of yarn. An outline is given of the methods currently in use to measure folding twist.
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