Online Seminar Highlighting Research of Thermal Effusivity as a Performance Metric for Thermal Comfort in Textiles

Presented by Special Guests Patricia Dolez, Susan Sokolowski, and Md Rashedul Islam

This online seminar brings together a panel of academic and industry leaders in the textiles industry. Topics such as the industry standard ASTM D7984, thermal effusivity, and thermal comfort will be discussed, as well an in depth look into research done on cool/warm touch sport wear materials.
Dr. Sokolowski from the Univeristy of Oregon will discuss her research summarized here – In the sports product industry, technical apparel materials can be developed to be perceived warm or cool to the human touch. Those created for warm touch are typically for cold environments – generating warmth for athlete comfort, whereas cool touch materials are developed for hot environments – making the athlete’s skin surface feel cool and fresh. These attributes can be engineered into the face or back side of the material – providing different point-of-purchase and next-to-skin perceptual experiences. The goal of this study was to define warm and cool touch effusivity spectrums that the sports apparel industry can reference when developing new technical materials. The warm and cool touch characteristics of common sports materials were evaluated mechanically with a Modified Transient Plane Source (MTPS) sensor and perceptually with a human subject fingertip test protocol. From the data collected, cool and warm touch effusivity spectrums were determined for face and back material sides. The results of this study provide sports apparel material developers insight into target effusivity value ranges for athlete warm or cool touch perceptual experiences.
Patricia Dolez and Md Rashedul Islam from the Univeristy if Alberta will discuss their research summarized here – The study investigated thermal effusivity measurement methods (ASTM D7984 and air-hoop) using 27 sportswear fabrics. The pressure range specified in ASTM D7984 can potentially compress the fabric, resulting in material-based thermal effusivity measurement. Applying a 1-kPa pressure gives a good measurement accuracy while preserving the fabric’s 3D structure. Both methods demonstrate a strong correlation for fabric thicknesses ≥ 0.4 mm.
The seminar will be run by Arya Hakimian, Application Scientist from C-Therm Technologies.

This webinar aired on October 20, 2023 @ 1:00PM GMT-3.

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