Warm-Cool Feeling Relative to Tribological Properties of Fabrics

Abstract

When the human hand touches a garment that is at a different temperature than the skin, heat exchange occurs between the hand and the fabric, and the warm-cool feeling is the very first sensation. This transient transfer of energy depends on the contact interface between the skin and the fabric, and the contact interface depends on many morphological and structural parameters like fiber morphology or yarn and fabric structure. This paper describes a new experimental device for measuring heat absorption of textile materials in a transient state. The link between the transient thermal behavior and the tribological properties of fabrics is then made to show the influence of contact interface and therefore the influence of morphological and structural parameters on heat transfer. This investigation involves two cotton varieties (Pima of Morocco and Kaba S of Benin), two yarn structures (single and two-ply yarns), and three stitch lengths of jersey fabrics.

An Investigation On Air and Thermal Transmission Through Knitted Fabric Structures Using the Taguchi Method

“…A higher thermal conductivity value indicates higher ability of the material to conduct heat and higher thermal absorptivity means cooler feeling and vice versa [16].…”

Sensory and Physiological Issues

“…Several studies have then been undertaken to use instruments to measure fabric hand, notably Kawabata's method of the Japanese Hand Evaluation and Standardization Committee (HESC) in the 1970s (HSEC, 1980;Kawabata, 1988), and a number of mechanical devices, including KES (Kawabata Evaluation System), FAST (Fabric Assurance by Simple Testing), and UST (Universal Surface Tester), have been developed to objectively characterize fabric hand quality (Pan & Yen, 1992;Pac et al, 2001;Fontaine et al, 2005;Issa et al, 2008;Maâtoug et al, 2009). Along the instrumental tests, all fabrics are subjected to deformations similar to those applied by the hand experts, using the same modes and rates.…”

Influence of agro-cellulose fibre based yarn structure on subsequent textile transformation and end-use properties

“…Stoga je izuzetno važna sposobnost prenosa toplote odevnih tekstilnih materijala u pravcu normalnom na površinu kože. Furijeova jednačina, koja važi za homogene materijale i prema kojoj za dati temperaturni gradijent (∇T), toplotni fluks (q) (Wm -2 ) u pravcu normalnom na posmatranu površinu raste sa povećanjem toplotne provodljivosti materijala (λ) (Wm -1 K -1 ), može se primeniti i za porozne vlaknaste materijale [95,96]:…”

“…Toplotna provodljivost delimično kristalnih polimera, kakvi su polimeri u tekstilnim vlaknima, određena je njihovom molekularnom strukturom, gustinom, stepenom kristalizacije, stepenom orijentacije kristala i pokretljivošću molekulskih lanaca u amorfnim područjima [103][104][105]. S obzirom na dobro poznatu činjenicu da su konvencionalna tekstilna vlakna u osnovi polimeri relativno male gustine sa razvijenom kapilarnom strukturom, istraživanja su potvrdila da se čak i varijeteti iste vrste vlakana mogu međusobno razlikovati u pogledu termičkog ponašanja [96]. Takođe, svaka hemijska, biološka ili fizička obrada vlakana, kao što su na primer alkalna obrada pamučnih vlakana [106] ili kotonizacija vlakana konoplje [107], koja menja morfologiju vlakna izaziva nužno i promene u termičkom ponašanju.…”

“…Operacija končanja pređa, takođe, utiče na termička svojstva pletenina kroz promenu gustine pakovanja vlakana [96]. Ispitivanjem termičkog ponašanja pletenina izrađenih od PES filamenta ustanovljeno je da se upotrebom teksturiranih filamenata smanjuje toplotna provodljivost materijala kako zbog prisutne veće količine vazduha između monofilamenata tako i zbog povećane debljine materijala [110].…”