Three-layer woven fabrics with two warp and three weft systems are considered as thick fabrics, in which
the third wadded weft yarn group is used to increase the thickness, to color separate two layers, and to
stitch the top and bottom layers. The purpose of this study was to investigate the effect of changing the
weave pattern and the count of wadded weft yarn in the fabric structure on the physical properties of the
fabric including air permeability, thickness and compression energy, thermal resistance and water vapor
permeability. In this research, weft wadded yarns with the fineness of 24/2, 36/2, and 48/2 Nm and weave
structures of “plain-plain”, “twill 2/2- twill 2/2” and “twill 2/2- plain”, in the top and bottom layers, were
used for fabric production. After the production of fabrics, experiments were performed to investigate
the effect of the wadded yarn fineness and the weave structure on the physical properties of the fabrics.
Analysis of the results showed that in comparison of various weave structures, the “plain-plain” had the
highest air permeability and water vapor permeability and the least thickness and heat resistance. “Twilltwill”
showed the maximum thickness and heat resistance and the lowest amount of air permeability
and water vapor permeability. In view of the effect of wadded yarn count, it was found that the 24/2 Nm
yarn had the highest air and water vapor permeability, and the lowest thickness and thermal resistance.
The 48/2 Nm yarn had the maximum thickness and thermal resistance and at the same time exhibited the
minimum air and water vapor permeability.