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抄録

The effects of conditions of fiber-forming processes, such as spinning, drawing and formalization, on the void content in PVA fibers are studied.
The extremely small voids in fibers are measured by the diffuse scattering of X-rays at small angles. The larger voids are estimated by means of optical microscopic observation and measurement of visible ray transmittance. Wet-spinning of the aqueous solution of PVA gives fibers with higher void content and dry-spinning as well as semi-melt spinning with lower void content. The higher the rate of coagulation in wet-spinning is, the higher the void content is. Drawing of fibers increases the larger voids. Furthermore, the comparison of the void content of formalized fibers under various onditions suggestes that the initial swelling power of formalization bath affects the void content in fibers.