Permeability and Wicking Properties of Modal and Lyocell Woven Fabrics Used for Clothing

Abstract

In this study, air permeability, water vapor permeability and wicking properties of certain woven fabrics, which are important comfort properties for clothes and garments, have been investigated. The effects of raw material (modal, Lyocell), weave pattern (plain, 2/2 twill, 1/3 twill, 2/2 matt) and weft yarn density (18, 22, 26) on these properties have been analysed graphically and statistically. The comfort characteristics of fabrics (permeability and wicking properties) are closely associated with the changes in their structural parameters: 2/2 matt and plain woven fabrics, where porosities are high, have better permeability and wicking properties. Increasing weft yarn density lead to decreases in porosity, resulting in decreased permeability and wicking properties. Increasing yarn twist increased the porosity of the fabrics. Lyocell fabrics showed improved permeability and wicking properties over modal fabrics due to Lyocell fibers' high percentage of fibrillary structure.

Precision of Measurement of Water Vapor Resistance of Fabrics With Different Surface Roughness by a Skin Model

“…As the boundary layer thickness divided by a diffusion coefficient (or by a thermal conductivity) presents approximately its water vapour resistance (or thermal resistance), the measured levels values of these principal comfort parameters can differ from the real ones. Certain effect of the fabric surface roughness on the measured thermal and evaporation resistances caused by varying fabric structure was observed in [5,6].…”

“…Thus, the fabric surface roughness, which strongly influences the air friction coefficient f, theoretically influences the Ret and Rct levels also and in this way affects the measurement precision. For the purpose of next extension of this study (determination of evaporation resistances Reto and Ret, mass transfer coefficient ßp [kg/m 2 /s] can be determined from the following experimental equation applicable for a laminar flow along a flat plate [6] instead of the Equation ( 6), as it is quite uneasy to measure the air friction coefficient: Sh = 0,664•Re 0,5 •Sc 0,33 ßc = Sh. Da/d (7) ßp = 0,664•Re 0,5 •Sc 0,33 .…”

Investigating the effects of wicking and antibacterial finishing treatments on some comfort characteristics of Meryl skinlife for seamless activewear/sportswear

“…The parameters affecting wicking are known as surface tension, effective capillary pathways, and pore distribution. 54 It was assumed that by both the finishing treatments, the surfaces of the yarns were completely covered with the finishes and/or the fibers were bonded to each other with these coverings formed as a film in between them. [55][56][57][58] These coverings were assumed to prevent the water molecules to penetrate into as well as to be encaptured inside the yarn structure, since they decreased the interfiber spaces and, hence, the capillary pressure.…”

Nanomaterials-patterned flexible electrodes for wearable health monitoring: a review

“…Different flexible substrates have been explored to fabricate wearable devices for body conformable electronics. Among different flexible substrates, textiles offer high surface area [ 1 ], porosity [ 2 ], air and moisture permeability [ 3 , 4 ], and maintain the microclimate of skin to ensure comfort [ 5 ] compared to flexible plastic substrates [ 6 ] for developing truly wearable electronics [ 7 – 9 ]. Electrodes based on textiles are currently ubiquitous for monitoring physiological and environmental phenomena, and human–computer interactions [ 10 – 13 ], personal thermal management [ 14 – 17 ], antennas for tracking and communicating [ 18 – 21 ], energy harvesting [ 22 – 25 ], and storing devices [ 26 – 29 ].…”