Study and Interpretation of the Mass Transfer Phenomena through Textile Structures in the Wet State

Abstract:

In last decades, increased attention is paid to comfort properties of textiles and garments. The most important parameters characterizing the called physiological comfort of textile structures are the evaporative resistance and water vapour permeability. Contrary to common textiles, protective and functional garments and, also some technical textiles, are also used in wet state, which affect their comfort properties. In this paper, PERMETEST commercial instrument is described, which provide reliable non-destructive measurement of evaporative resistance and water vapour permeability of fabrics in dry and wet state. By means of this instrument, evaporative resistance and water vapour permeability of cotton, polyester and cotton/polyester knitting fabrics, in the wet state, were experimentally determined and results were discussed. The effect of count yarn and composition of the above mentioned properties of these fabrics has been investigated as well. Some surprising results were achieved: with increasing fabrics moisture, the water vapour permeability also increases, especially with the presence of hydrophilic textile material.

• Periodical: Defect and Diffusion Forum (Volumes 326-328)
• Pages: 205-208
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.326-328.205
• Online since: April 2012
• Authors: Maria José Geraldes, C. Monteiro, Lubos Hes
• Keywords: Evaporative Resistance, Physiological Comfort, Water Vapour Permeability, Wet Textile Fabric

References

[1] L. Hes and P. Sluka: Introduction into Clothing Comfort (in Czech, Textbook, Technical University of Liberec, 2005).

[2] L. Hes: The effect of Planar Conduction of Moisture on Measured Water Vapour Permeability of thin woven fabrics (Fall Fiber Society Conference, Lake Tahoe, 2002).

[3] L. Hes and I. Dolezal: A New Portable Computer-Controlled Skin Model for Fast Determination of Water Vapour and Thermal Resistance of Fabrics (Asian Text. Conf. 7), New Delhi, 2003).

[4] ISO 11092 Standard: Textiles - Physiological effects – Measurement of the thermal and water-vapour resistance.

[5] A.M. Schneider: Heat Transfer through Moist Fabrics (PhD Thesis, UNSW Australia, 1987).

[6] L. Hes and I. Dolezal: Precise measurement of water vapour permeability of wet fabrics (Editor P. Nousianen, AUTEX International Textile Conference, Tampere, 2007).

[7] L. Hes, I. Dolezal and L. Hesova: Simulated objective evaluation of warm-cool feeling of baby diapers (In: International Fiber Conference (IFC), Seoul, 2006).

[8] C. Monteiro: Design de Estruturas Têxteis com Elevado Desempenho Fisiológico (in Portuguese, Master Thesis, Beira Interior University, 2009).