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Abstract
The drawing process behavior was investigated with focus on fiber stretching speed (spinning acceleration) to improve luster quality of fibers. Wet spinning method has a limitation of low luster at high spinning speed. It was determined that (1) luster quality could be evaluated by arithmetic average (RΔa) of fibers, which indicated the roughness, and (2) the roughness of the fiber was related to the spinning acceleration through the analysis of RΔa. Spinning acceleration was measured by chasing markers that were used to tie fibers. Regardless of the length of spinning bath, fibers were mainly stretched during the first stretching stage. Therefore, a multistep drawing method was used. In the case where the drawing ratio was 220% by one-step, RΔa was 10.1°; however by multi-step drawing (1st and 2nd drawing ratios were 148.3%), RΔa decreased to 8.3°. The multi-step drawing method enabled the reduction in fiber roughness by preventing a sudden change in fiber stress. In addition, high temperatures improved the fiber roughness. At high temperatures, roughness decreased despite the high acceleration because the fiber was easier to stretch than at low temperatures.
Highlights
Wet spinning method has shown high productivities for a long time. This method with acrylic polymer is preferred to construct fibers such as human hair products because of good texture and feel. It is limited by low luster at high spinning speeds
First drawing process is in the bath and the second drawing process is after drying, and the drawing ratio is approximately 200– 800% (Ohe et al, 1967)
We focused on roughness in drawing process in the bath and we investigated fiber behavior during drawing
Summary
Wet spinning method has shown high productivities for a long time This method with acrylic polymer is preferred to construct fibers such as human hair products because of good texture and feel. It is limited by low luster at high spinning speeds. Desolvation in the bath is related to the fiber stretching ratio, but the relationship between roughness and drawing behavior has not yet been clarified. We focused on roughness in drawing process in the bath and we investigated fiber behavior during drawing. By controlling the factors that result in fiber roughness in the bath can allow high productivity by wet spinning
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