AROMATIC POLYAMIDES DRYING IN PNEUMATIC T RANSPORT

The granular aromatic polyamides, having a 40-70% initial humidity, we re dried in hot air pneumatic conditions, at 80-100 degrees C temperat ure and 5-10 1/s. volumetric flow-rates. The factorial technique exper iment planning allowed us to determine the optimum values for the hydr odynamic parameters of the pneumatic transport and for the drying cond itions. The material being practically, non-thermodegrable, the drying agent temperature was increased to 100 degrees C; the material recycl ing condition, for getting a final humidity close to the equilibrium o ne, were establised.