Ultrasonic technology is widely used to assist many industrial and domestic applications. However, the effect of ultrasonic washing on the thermophysiological properties of natural based fabrics has not been studied yet. This study aims to examine the relationship between unwashed, ultrasonically washed, and conventionally washed fabrics in terms of their abrasion behavior, flexural rigidity, and comfort properties (thermo physiological). Five specimens of 100% natural based fabrics: linen, bamboo, organic cotton, cotton and wool, were washed using both ultrasonic and conventional methods under a 40oC degree washing temperature. All fabrics were washed ten times for 15, 30, 45 and 60 minutes. No direct correlation between the unwashed and washed fabric abrasion and flexural rigidity properties was observed. Fabric thermal conductivities were changed after the washing processes and in most cases; the ultrasonically washed fabrics had higher conductivity values. It was also observed that lower washing times (15 and 30 min) using the ultrasonic method decreased the thermal resistance of the fabrics. Furthermore, it was also clear, according to the thermal absorptivity results, that the ultrasonic washing method benefited the natural fiber based fabrics. Conventionally washed fabrics were found to have superior water vapor permeability compared to ultrasonically washed fabrics. The ultrasonically washed fabrics have considerably higher heat loss values than the conventionally washed fabrics.
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