Abstract
The heat transfer phenomenon of Polyethylene Terephthalate (PET) yarns is studied. As the stress change in a running yarn undergoing normal deformation depends upon the heating, it is possible to estimate the temperature to which the yarn has subjected.
Heat transfer rate to a yarn decreases as the yarn twist increases. When a yarn in false-twist texturing is given a twist on a heater, the yarn temperature increases faster than that of a yarn running without rotation. As the degree of twist on the heater increases, so does the apparent heat transfer coefficient. However, as the increase is extremly small, it is closely akin to the heat transfer coefficient of saturated twist yarns.
