48—Controlled Balloon Spinning

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Abstract
The paper gives an outline of a spinning system, now the subject of British Patents, which can be effectively used to increase the production of ring frames, particularly of the long-lift type. Equations developed in a previous paper1 are extended to cover the case of balloons described by compounded Cartesian equations*, and the possibilities of obtaining reduced yarn tension, constant yarn tension, and higher spindle speed are explored. As in the previous work, air drag has been neglected. This factor, which can be calculated, has in the present instance and on the machine considered been found negligible up to the speeds so far envisaged, but the relative effect is discussed in the text. Details are given of tests carried out under normal spinning conditions to cross-check the validity of the theory and its application to long-lift, large-package machines. The relation between centrifugal force and yarn tension is discussed and the inter-relation of spinning tension and winding tension with balloon variation is demonstrated. The effects of traveller friction and yarn friction are explored and values arrived at for these factors. Curves are given showing the variation of spinning and winding tension with balloon length. It is concluded that the application of controlled balloon spinning to long-lift, large-package machines will allow substantial increase of spindle speeds under the derived conditions, and that constant tension through the package build can be maintained. Some details are also given of preliminary larger-scale trials of the system and this will be more fully discussed in another paper at a later date.

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