Heat Transfer in False-Twist Texturing

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Abstract
A mathematical model for the heating of yarn in the false-twist texturizing process was formed, and an equation for the surface temperature of the yarn for contact-type heaters was derived. An expression for the temperature distribution in the cross section of the yarn in the heater zone was derived mathematically. The surface temperatures of nylon and polyester yarns of different deniers were measured and compared with predicted values. For measuring the surface temperature, a Fiber-temp® non-contact-type temperature measuring instrument was used. The yarns were heated using controlled short heaters 12 in. and 8 in. long. The temperature distribution in the cross section of the yarns was calculated from the equation for various yarn speeds and heater temperatures. The temperature difference between the surface and the center of the yarn was found to be small for the normal yarns used in texturizing, even at very high speeds. Polyester yarns were found to heat up faster than nylon yarns due to the lower heat capacity of polyester. The heavy denier yarns were heated more slowly than the lower denier yarns because of the lower A/M (surface area/mass) ratio of the high denier ones.

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