25—THE FORM OF YARN TWISTING PART I: IDEAL CYLINDRICAL AND RIBBON-TWISTED FORMS
- 1 July 1966
- journal article
- research article
- Published by Taylor & Francis in Journal of the Textile Institute Transactions
- Vol. 57 (7) , T294-T307
- https://doi.org/10.1080/19447026608662371
Abstract
Yarns may twist either as cylindrical bundles of fibres or as flattened ribbons: the former mode has been the basis of most scientific studies. The present paper describes the behaviour of a rubber strip as a model of a yarn ribbon. On twisting the strip, the twisted form that appears initially Is subsequently replaced by a wrapped-ribbon form. The energy relations causing this are discussed, and the theoretical prediction is compared with experimental results. The geometry of the wrapped-ribbon form is analysed, and its consequences oti the expected form of yarns are considered. A wrapped-ribbon yarn may degenerate by collapse into a cylinder, but the relics of the ribbon-twisting are apparent in asymmetry and in a redistribution of the fibres in the yarn.Keywords
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