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The effect of air drag on fiber structure formation in high-speed spinning of fine denier filaments of poly (ethylene terephthalate) has been investigated for take-up velocity up to 6, 000m/min. Air drag force increases with increasing the distance between spinneret and take-up roller without changing other spinning conditions. In the case of 1.5 denier/monofilament taken-up at 4, 000m/min, fiber structure changes from partial crystalline phase to amorphous one with increasing the distance, though spinning conditions such as through-put rate and cooling rate are not changed. This indicates that the air drag largely influences the fiber structure formation for the case of fine take-up denier. The exceeding increase of the air drag force causes a cold drawing between a solidification point and take-up roller. This cold drawing lower the fiber velocity at the solidification point. Consequently, crystals are not sufficiently developed below the solidification point.

EFFECT OF AIR DRAG ON FIBER STRUCTURE FORMATION IN HIGH-SPEED SPINNING OF POLY (ETHYLENE TEREPHTHALATE)