Abstract
The dry spinning condition for obtaining acrylic continuous filaments, using dimethylformamide as a solvent, was investigated by the experiment of orthogonal array of 215 type, as to the longitudinal dispersion of denier, residual solvent content, and fluff. The factors taken up in the experiment were, the temperature of a spinning shaft, the temperature of hot air, the temperature of spinning solution, draft (stretching ratio during spinning), six two-factor interactions of these four factors, a rectifier for hot air, and staic pressure at the outlet of the shaft. It was found that:1. the higher the temperature of spinning solution, the smaller the longitudinal dispersion of denier; and attaching a rectifier for hot air above a spinneret makes the dispersion of denier smaller. Although this effect of the rectifier gets smaller when the temperature of the spinning solution becomes 150°C, at this temperature a long steady spinning is impossible without exchange of a spinneret. Furthermore, smaller draft makes the dispersion of denier smaller. The smallest value of dispersion of denier estimated is 8.56±2.04 denier in the range of 10 samples (converted to the stretched filament of 50 denier, at 5% level of significance, the number of efficient repetition=6.4).2. The residual solvent content of the filament wound up is smaller, as should be, when the temperature of spinning solution is higher; and although smaller draft also makes the residual solvent content smaller. this effect of draft vanishes as the temperature of hot air becomes 270°C. The smallest value of residual solvent content estimated is 16.25±0.81% (at 5% level of significance, the number of efficient repetition=6.4).3. There are no factors significant for fluff. From the results 1 and 2 above, it is interpreted that the longitudinal dispersion of denier is caused by the disturbance of the hot air below the spinneret, where the filament just formed is not completely dried yet, while the fluff is considered to arise from causes which could not be controlled.
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