20—THE EFFECT OF ROLLER VIBRATION ON YARN REGULARITY

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Abstract
The general nature and some causes of roller vibration are discussed briefly and a more detailed description of stick–slip roller vibrations is followed by a theoretical analysis of the effect of such vibrations on the fibre arrangement during drafting. For single-zone drafting systems, the effect of vibrations occurring at (a) the input rollers and (b) the delivery rollers is considered. The theoretical effect of vibrations of the intermediate rollers of two-zone drafting systems is shown to be very great. Natural limitations of the effect of roller vibration on the ultimate yarn are discussed. The original wavelength of vibration has been found to have a considerable effect on the amplitude of variation of fibre arrangement introduced by roller vibration. The effects of the wavelength/fibre-length relationship and imperfections in drafting, which have been fully treated elsewhere, are regarded as factors tending to reduce the ill effects of roller vibration. A theoretical study of the effectiveness of one, two and three doublings as a means of reducing the effect on the yarn of strictly periodic variations introduced at an earlier process shows that doubling is not a satisfactory way of eliminating the effect of roller vibrations.

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