Polyester processability texturing

In figure 9 we see an 80 microgram sample of Burlington polyester fabric (textured fiber cut from a pick on a pair of double-knit slacks). Even in this small sample the processing temperature is apparent, and the double peak on the initial run indicates the material as polyester. The rerun after program cooling reveals a single peak and a flat pretransition baseline. 

Polyester Processability in Texturing as a Function of Spun Yarn Morphology... 

Fig. 9. Dyeing of texturized yams of standard and modified polyesters with disperse dyes and carriers or at increasing temperature and pressure (HT process) ...

FIGURE 1.8 Typical polyester yarn bulking process, faise-twist texturing. 

The bicomponent fiber technology began in the 1960s on polyester and polyamide fibers. This technology encompasses a vast variety of polymers, filament shapes, and processes. As recent examples, Howe et al. [394], Wu [395], and Talley et al. [396] have disclosed spin-texture processes for the preparation of self-crimped polyamide bicomponent fibers. DuPont [397] disclosed the method for high-speed spinning bicomponent fibers. The use of a bicomponent yarn with another yarn to form a composite yarn bundle has been taught by Stevenson et al. [398] and others. 

Utilizing the properties of copper, two durable platform technologies woe developed [1,13] the first one plates cotton fibres with copper oxide (Fig 1, left panel) and the second one impregnates polyester, polypropylene, polyethylene, polyur hane, polyolefin or nylon fibres with copper oxide (Fig 1, ri t panel). The fibres can be cut into short staple or produced in filament form and texturized, if so desired. The product yielded is a fibre that can be introduced at the blendii stage of yam production or directly into a woven or knit product so that no manufacturing processes are changed. Woven and non-woven fabrics can be produced. 

Perhaps the most obvious characteristic of thermotropic polyesters Is their bulk appearance. These polyesters, whether aliphatic-aromatic as the X7G type or the wholly aromatic structures, all have a fibrous, almost wood-like texture. The fracture surface of a strand shows the typical highly fibrillar morphology. If such a strand Is put through a conventional cutting process, a fuzzy and very fibrillar chip often results. Another plainly visible characteristic of thermotropic polyesters Is the opalescent, almost metalllc-1 Ike surface sheen. 

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