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In an earlier publication it was noted that the filaments of most rayons have a uniform skin. This skin is usually thicker in the strong, tougher types used for tire cords than it is in textile yarns. In the present paper, the more recently introduced crimped rayon staple fibers are shown to have an unbalanced skin structure resulting from an asymmetrical distribution of skin around the core. Three general types of unbalanced cross sections, possible mechanisms for producing various types of unbalance, and conditions necessary for building crimp into a fiber are briefly described.
Sisson et al. (Sun,) studied this question.