Clothing comfort and yarn packing relationship: Part II - Transmission characteristics of fabrics

The effects of ring frame process parameters affecting the packing of yarn, namely yarn twist, spindle speed and draft at ring frame, on fabric transmission characteristic have been reported in the present paper. The detailed results on the yarn characteristics and low-stress mechanical properties, due to change of these ring frame parameters, have been reported in Part I of this series. It has been observed that there is very strong evidence that by changing the above ring frame process parameters, which affect the packing factor of yarn, the transmission characteristics of the fabrics can be manipulated. The yarn packing factor is directly related with the yarn diameter. All the studied ring frame process parameters have direct relationship with air permeability, thermal conductivity and relative water vapour permeability, i.e. with the increase in these ring frame parameters the above fabric transmission parameters increase, but water retention characteristics show opposite trend. Thermal absorptivity was found to be related with the fabric surface roughness.