Journal of the Textile Machinery Society of Japan

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The q_max; value was introduced as a measure of predicting warm/cool feeling of fabrics by Kawabata et al., where q_max; is the peak value of heat flux which flows out of a copper plate having a finite amount of heat into surface of fabric after the plate contacts the fabric surface.
In this paper, at first, a theoretical prediction of q_max; is given as a transient heat conduction within homogeneous body and the predicted q_max; was interpreted with respect to the effects of test condition and the thermal properties of test specimen.
Secondly, heat conduction within human skin after the contact of an object was analyzed. It was found that there is a time lag between the contact of metal plate and the detection of warm/cool feeling at the sensory spot in the skin. It was also found that the time lag within the skin can be effectively replaced by a first order lag electrical circuit.
This result supports the validity of using q_max; as a measure of warm/cool feeling.

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Author have previously reported that the distribution of a specular reflected light, i.e., goniophotometric curve, on fabrics can be simulated by assuming the warp yarn to be a simple elliptic column. Experimental results agreed well with these calculated curves. It is desirable, however, to use a model more closer to the real fabrics, since the surface of fabrics is very complicated.
Simulated goniophotometric curves were obtained in a computer simulation using a new thread model, in which a parallel light flux was assumed to be projected to the fabrics. The new thread model consists of many fine elliptic cylinders arranged side by side covering the entire surface of a large elliptic column. In this computer simulation, the axis of incident light flux and photodetector was assumed to lie on a plane perpendicular to the warp ends of fabrics.
This new simulation method can find wider use than that of the previous paper.

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