The dimensional stability of thermoplastic filament yarns is decided by the residual shrinkage present in the yarn. The residual shrinkage is measured by either boiling water method or hot air method. Both these methods are time consuming and only short lengths are tested. The shrinkage force is measured by some instruments very quickly and long lengths of yarns are tested. So, in this study, a relation is developed between shrinkage and shrinkage force, so that the filament yarn manufacturer can predict the shrinkage of the yarn by quickly measuring the shrinkage force.
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