Abstract
The effects of the various melt spinning conditions such as linear velocity in capillary, draft (or winding speed), cooling path distance and temperature of chilled bath on some properties of undrawn filaments were investigated.
The increase of linear velocity in capillary and draft produces the orientation of molecular chains which results in the indistinctness of yield point, the increase of tensile strength and the decrease of elongation of the stress-strain curves. The birefringence of undrawn filament also increases with the increase of above two spinning conditions. These orientations of molecular chains also increase by the increase of the shear rate owing to the decrease of capillary diameter and the increase of the melt viscosity due to the increase of Mn. The cooling conditions chiefly influence the crystallinity of undrawn filaments. Consequently, in our experimental conditions, it is observed that the densities of filaments become smaller by the sudden quenching.
