Vedat Dal

Investigation of the effects of fabric parameters on air permeability of woolen fabrics

Permeability and porosity of woolen fabrics are investigated experimentally in this paper. Permeability experiments are conducted in a wind tunnel to the TS 391-EN ISO 9237 standard. Woolen fabric is placed in the test section of the wind tunnel to measure permeability to airproofing . Velocity measurements are made used a hot wire anemometer in the front and rear of the wool. Air permeability is closely related to pore size and distribution. So, it is important to study porosity, in order to classify and determine the right use of woolen fabrics. Many methods are used to estimate porosity. In this study, the theoretical model is used for determination of porosity values, and the influence on porosity of various fabric parameters was investigated. Depending on the permeability, weft and warp density, weight, fabric thickness and porosity relationship are investigated. The results are presented as graphs.

Investigation of thermal comfort properties of zinc oxide coated woven cotton fabric

In this paper, we investigated thermal comfort properties of twill weave cotton woven fabric coated zinc oxide layer in Roaches high temperature sample dyeing machine in gentle conditions. The effect of coated film structure on thermal comfort properties of the fabric was characterized using SEM observation, EDS analysis, and Permetest instruments. EDS analysis and SEM images of the ZnO coated twill weave cotton fabric proved that ZnO coating layer which has significant effects on thermal comfort properties was successfully synthesized on the fabric surface by covering the pores of the twill weave cotton fabric. Results showed that thermal resistance of ZnO coated fabric increased approx. 36–52%, while thermal conductivity is decreased approx. 27–34% and WVP is decreased approx. 22–28%. Further studies have started and in progress to evaluate wash fastness, wear performance, abrasion properties, and fabric handle properties.

Thermal Comfort of Woolen Fabrics Depending on Physical Properties

ABSTRACT In this study, thermal comfort properties of woolen fabrics depending on the physical properties have been investigated. Thermal and water vapor resistance of fabrics have been measured by the PERMETEST instrument and air permeability has been investigated in a wind tunnel. The air permeability depends on the shape and value of the pores and inter thread channels, which are dependent on the structural parameters of the fabric. Theoretical model has been used in order to determine the porosity values. Experimental data and regression statistics proved that porosity and other fabric parameters have a very strong influence on thermal comfort property.