Synthetic fibers heat effects

The shrinkage behaviour of the PET fiber also strongly depends on the process medium as shown in Figure 3. The effect is most distinctive when non-heat setted material was used. The shrinkage of the yam gives some information about the inner tension of a synthetic fiber and can be explained by a backfolding of the polymer chains instead of a disorientation of the macromolecules [10,11],... 

Although, heat setting generally affects the degree of crystallinity of synthetic fibers such as PET, Nylon 6, or Nylon 66, drying of these fibers has little effect. Fink et al. [37] recently discovered that extensive drying for Lyocell fibers under small tension leads to an increase in... 

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