Fabric comfort by modifying yarn structure: Part II—Low-stress mechanical, thermal and transmission characteristics of fabrics

19-25The present study aims at investigating the influence of yarn structure, modified through process parameters of ring frame (spindle speed, twist multiplier and ring frame draft), on low-stress mechanical, thermal properties and transmission properties of fabric. It is observed that the structural changes influence thermal, transmission and low-stress mechanical characteristics of fabrics due to change in fabric porosity and thickness. In general, the bending and compression properties increase but shear and surface properties of the fabrics decrease with the increase in spindle speed, twist multiplier and draft. The study further reveals that air permeability, thermal absorptivity, thermal diffusivity, heat conductivity and moisture transmission properties increase but thermal resistance decreases with the increase in spinning process parameters

Fabric comfort by modifying yarn structure: Part I – Study on structural changes by cross-sectional microtomy of yarn

A study has been carried out to engineer the fabric comfort by modifying the internal yarn structure through spinningprocess parameters. The yarn packing density is found to be one of most influential factors of yarn structure, which governsthe comfort aspect of the textile material. The work reported here mainly deals with the influence of ring frame processparameters, i.e. spindle speed, twist and draft, on mechanics of yarn structure. It is evident that an increase in spindle speed,twist multiplier and draft decreases the yarn diameter and accordingly increases the packing density. The reduction in yarndiameter is found to be maximum with the increase of draft followed by twist multiplier and spindle speed. The yarnpacking density also follows the similar trend. The radial packing density of considered yarns is neither uniform across theyarn cross-section nor maximum near the yarn axis. The maximum packing density is noticed at some distance from theyarn axis and it decreases further towards yarn surface. In general, yarns do not possess maximum packing density near yarnaxis. It is observed that considered process parameters significantly influence the packing in core, intermediate and surfacezone of the yarns

Fabric comfort by modifying yarn structure: Part I – Study on structural changes by cross-sectional microtomy of yarn

424-430A study has been carried out to engineer the fabric comfort by modifying the internal yarn structure through spinning process parameters. The yarn packing density is found to be one of most influential factors of yarn structure, which governs the comfort aspect of the textile material. The work reported here mainly deals with the influence of ring frame process parameters, i.e. spindle speed, twist and draft, on mechanics of yarn structure. It is evident that an increase in spindle speed, twist multiplier and draft decreases the yarn diameter and accordingly increases the packing density. The reduction in yarn diameter is found to be maximum with the increase of draft followed by twist multiplier and spindle speed. The yarn packing density also follows the similar trend. The radial packing density of considered yarns is neither uniform across the yarn cross-section nor maximum near the yarn axis. The maximum packing density is noticed at some distance from the yarn axis and it decreases further towards yarn surface. In general, yarns do not possess maximum packing density near yarn axis. It is observed that considered process parameters significantly influence the packing in core, intermediate and surface zone of the yarns

Fabric comfort by modifying yarn structure: Part II—Low-stress mechanical, thermal and transmission characteristics of fabrics

The present study aims at investigating the influence of yarn structure, modified through process parameters of ringframe (spindle speed, twist multiplier and ring frame draft), on low-stress mechanical, thermal properties and transmissionproperties of fabric. It is observed that the structural changes influence thermal, transmission and low-stress mechanicalcharacteristics of fabrics due to change in fabric porosity and thickness. In general, the bending and compression propertiesincrease but shear and surface properties of the fabrics decrease with the increase in spindle speed, twist multiplier and draft.The study further reveals that air permeability, thermal absorptivity, thermal diffusivity, heat conductivity and moisturetransmission properties increase but thermal resistance decreases with the increase in spinning process parameters