The comprcwiionnl and recovering curves of a fabric are considered to coasist of Ihree steps, respectively. The first and Ihird .steps of the compregional cur\e and the first step of the recovering; curve are approximated by the linear equation (v = a + lur). The second sleps of the comprussional and recovering curves arc bolh regressed by ihe exponential curves _>> =: a exp (tuc) + c. The third step of Ihe recovering cur*e is Ihe region al whieh instantaneous recovery Ls impossible. The calculated compres.sional and recovering curves agreed very well with Ihe experimental curves. The regression constant -b,, at the first step of the compressional curve, is related to Ihe bending of fibres on the fabric surface and Is aLso related to the yarn structure such as spun or filament. The regression coastant-b^, at the second step of the compressional curve. Is eoncerned with hardness in compression because of the friction between fibres. The regression constant -bj, at the third step of the compressional curve, is related to the fibre's material and can be used to explain the initial lateral eompres.sional modulus of the fibres.
Purpose -The aim of this study is to explore the influence of the clothing ventilation in three body regions on the humidity of the local clothing microclimates under five work-shirts immediately after the onset of sweating in light exercise. Design/methodology/approach -The clothing microclimate ventilations were measured at chest, back and upper arm using a manikin. Separate wear trials were performed to determine the sweat production and the humidity of the clothing microclimate at the same locations as where the ventilation was measured during light exercise. Findings -Every shirt shows the greatest value of ventilation index (VI) for the chest and the smallest one for the upper arm. The values of VI differ remarkably at the chest among the five shirts. Comfort sensation became gradually worse as the time passed after starting exercise. There was no significant difference among the clothing conditions in mean values of rectal temperature, local skin temperatures, microclimate temperatures, microclimate relative humidities and local sweat rates at three regions over 10 min after the onset of sweating. A relationship was observed between the ratio of the mean moisture concentration in the clothing microclimate to the mean sweat rate at the chest and the back and the VI. Originality/value -The results suggest that clothing ventilation should be measured in different body regions in response to sweat rates in corresponding regions.
In this study, mechanical properties and hand values are predicted from the parameters of weave structures. To promote the design of woven fabrics, we can define the crossing-over firmness factor (CFF) and the floating yarn factor (FYF) as the parameters of the weave structures for predicting mechanical properties and hand values. Both the CFF and FYF are related to some mechanical parameters and primary hand. Multiple regression equations of mechanical parameters and hand values are derived from those parameters of weave structures, and the predicted values almost exactly agree with the measured values from the KES-FB system.
The static and dynamic drape behavior of polyester Shingosen fabrics is investigated using the new mechanical parameter of dynamic drapability, that is, the dynamic drape coefficient with swinging motion Dd. The Dd of the Peach Face fabric is small and that of the New Worsted fabric is large. On the other hand, there are almost no differences between each group of Shingosen fabrics in node numbers and conventional static drape coefficients. In classifying production characteristics, yam-processing fabrics show larger values of Dd than other fiber-production and fabric-finishing samples. In classifying fiber characteristics contractile fiber and ultra-fine fiber Shingosen fabrics show smaller values of Dd than irregular fiber fabrics.
The static and dynamic drape behavioar of polyester-fibre shingosen fabrics was investigated precisely and analyzed by using the new mechanical parameters of the dynamic drapability of fabrics, such as the revolving drape-increase coefficient, />^, and the revolving drape coeffideDt at 200 r/min, />^. It is shown that the value of D^ of Peach Face type was small and that of New Worsted type was large. The value of i?^ of New Worsted type was larger than that for other shingosen types. On the other hand, there was DO dUTereoce between each group of shiogosen fiabrics in node numbers and conventional static drape coefGciente. In the classification by production characteristics, yam-processing-type fabrics showed larger values niD^ and D^t han fihre-production-and fahric-finishing-type fabrics. In the classification by fibre characteristics, contractile-fibre-type shingosen fabrics showed the smallest values of D^ and D.j^. These features of shingosen fabrics in static and dynamic drape behaviour became more distinct by means of discriminant analysis using tbe parameters of the revolving drape coefiBcients and also the conventional static drape coefGcient and node number as variables.
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