The boiling water shrinkage and dry-heat shrinkage rate of HT are also the greatest among the three types of industrial PET filaments.

The shrinkage and crimp behavior of CDP-FDY fibers at different drawn temperature after heat treatment are studied by means of boiling water shrinkage, hot shrinkage, crimp ratio and crimp rigidity.

Illustrated the uncovered polyurethane fiber as an example, the popular detecting points for semi products are given, such as the shrinkage in boiling water and elastic recovery.