The shrinkage behavior of copoiyester fibers (PEIT) and the ’ latent - crimp behavior of side - by - side PET/ PEIT composite fibers have been studied. It is shown that the shrinkage rate, the crimp ratio and the crimp rigidity of these fibers increase with the increasing isoph-thalate content of PEIT and the treatment temperature. The shrinkage in boiling water of the cold - drawn PEIT - A2 fiber appears to be higher than that of PEIT - A3. The shrinkage in dry air of the cold - drawn PEIT - A2 fiber is also higher than that of PEIT at temperature of 393 K or 413K, but lower at 453K. The crimp rigidity of the PET/PEIT - A: conjugate fiber appears to be obviously higher than that of the PET/PEIT - A, conjugate fiber. The mechanism of the shrinkage behavior related these fibers are discussed in detail.
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