Optimizing heat treatment process of PPTA fibers using uniform design

Poly(p-phenylene terephthalamide)(PPTA) fiber spun in our laboratory was heat-treated,and a regression model was established based on uniform design to investigate the effect of fiber tension,heat treating temperature and time on initial modulus,attempting to determine the optimal process conditions with the least possible times.A regression equation was found through computation,and its reliability was verified to be rather high by residual error analysis.Tension 0.01 cN /dtex,temperature 300 ℃,time 78.5 s,and the corresponding initial modulus 1 548.6 cN /dtex were the best heat treatment conditions of PPTA fibers,that were calculated with SUMT external point optimizing method.