The twist method of manufacturing textured yarns produces some stretch in the final product, but this can be controlled by the amount of twist or turns per meter set into the yarn.
When using the stuffer- box method to produce textured yarns, filament fibers are forced into a stuffing box or tube that causes them to develop a sawtoothed crimp. The crimp is heat - set
Physical properties of PET/PA blended air-jet textured yarns
Relationship between texture parameters and evenness of textured yarns