Melt Spinning of Poly-xylyleneadipamide

The present article discusses the optimum drawing condition of the undrawn filament of Poly-xylyleneadipamide. The relationshipbetween the moisture regain of the undrawn filament and optimum hot-pin tempearture is also discussed (Tenacity and other physical properties of drawn filament are affected by the pin-temperature during drawing).The results obtained are : 1. Undrawn filament does not crystallize at conditions of 20°C and at 64 %RH, or less, however it crystallizes at 20°C and at 70%RH or more.2. When the tenacity of drawn filament, the its breaking elongation, and its drawing tension, are plotted against reduced pin-temperature, smooth curves are obtained, only when the moisture regain of undrawn filament between 2.2 to 3.6 wt%.If the moisture regain of undrawn filament increases by 1 %, the pin-temperature decreases by 12°C. Consequently the following equation was established : T=115-12MT : optimum pin-temperature (°C) M : moisture regain of undrawn filament (wt%).