The properties of polylactic acid (PLA) resin were first studied.The air drafted PLA fibers were then manufactured by the spun-bonded nonwoven fabric equipment.The morphology,thermal properties and tensile properties of PLA fibers were characterized by the video microscope,differential scanning calorimeter and universal material tester.The results showed that the melting point of PLA resin was 168.7℃.The longitudinal surface of PLA fibers was smooth and straight,and the cross section was round.The linear density of PLA fibers decreased with the increase of intensity of air drafting.The breaking strength increased,whereas the elongation at break firstly increased and then decreased as the intensity of air drafting raised.Moreover,the glass transition temperature (Tg) and melting point (Tm) of PLA fibers increased,and the cold crystallization temperature (Tc) decreased via the air drafting.The crystallinity of PLA fibers firstly increased and then decreased with the increase of intensity of air drafting.
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