16—HEAT-TRANSFER IN HIGHLY TWISTED NYLON YARNS

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Abstract
Engineering development of false-twist crimping machinery has made possible very high speeds of operation. However, it is found that practical speeds are limited by the heat-setting part of the process. This may be due to one of two things, either the time required for the yarn cross-section to reach a uniform temperature, or the time required for internal molecular rearrangement to take place. By measuring the thermal properties of highly twisted nylon yarns and the surface temperature of such yarns as a function of time, the internal temperature distribution of the yarn may be calculated at all times throughout the heating cycle. It is shown that the temperature within the yarn iS very nearly uniform at all stages of heating, and heat-transfer coefficients are calculated. It is concluded that the speed-limiting process is that of molecular rearrangement, and not that of heat-conduction.

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