The Crimp Shape and Crimp Elasticity Parameters of the PET/PTT Bicomponent Fibers

The crimp shape and crimp elasticity characters of the PET/PTT monofilaments and multifila-ments under different tension and temperature were analyzed.As the tension of the heat treatment rose,the crimp frequency and the crimp radius of the monofilament went down,the crimp elongation rate went down,the crimp recovery rate and the crimp modulus of the monofilament and multifilament went up.As the temperature of the heat treatment rose,the crimp frequency increased and the crimp radius decreased.And the crimp elongation decreased,the crimp recovery rate and the crimp modulus of the monofilament and multifilament increased.When the temperature was 100～120 ℃ and the tension was little,the crimp elasticity of the PET/PTT monofilaments and multifilaments were better.