In recent years, the interest in studying balloon formation during unwinding has been rekindled by recent publication of several significant papers on the dynamic analysis of moving yarns in rotational modes. The renewed interest can be partially attributed to the availability of powerful computing tools needed to solve problems of this kind. This paper is the first of a series of papers reporting results of ongoing research at NCSU. In this paper, apart from a critical evaluation of some recently published work, the physics of unwinding as proposed by earlier publications is examined through extensive parametric studies. That is, two parameters of high practical importance, balloon shape and unwinding tension, are calculated as functions of the direction of unwinding (from front-to-back and back-to-front), wind angle, residual tension in the yarn on the package, and the coefficient of yarn-package drag. In addition, limitations of a two-region analysis are addressed.
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