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Abstract:
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Heat history of synthetic yarn dictates important properties including dyeability and
bulk. In the false-twist texturing process, the application of heat to the filaments is also a
major parameter that controls yarn and fabric properties. To achieve and maintain the
desired bulk of a textured yarn, the yarn temperature must be raised to the correct level in
the texturing process. Heat transfer models have been published for heaters with a single
zone primary heat, but little has been published on heat transfer models for two-zone
primary heating. Also, little has been published on the comparison of yarn properties for
different texturing heater types using different deniers and filament counts.
Heat transfer models relating various machine setting parameters and raw yarn
properties are invaluable when setting up texturing machines to produce high quality
textured yarns. Therefore, in this study, heat transfer models were developed using
thermodynamic principles. These models were found to accurately predict yarn
temperature using machine setting parameters and raw yarn properties.
This study determined the effects of various heater constructions. A 2.5-meter
conventional contact heater and two different I.O-meter high temperature heaters were
used. The heaters had geometrical differences as well as temperature ranges, which
affected heat transfer and, consequently, were found to affect yarn tensions and dye
uptake. Yarn properties such as textured yarn denier, tenacity, and elongation were
significantly affected by differences in machine manufacturing settings. Power
consumption was also found to be lower for the 2.5-meter heater than the I.O-meter
heater.
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