ミシン針温度に影響を及ぼす布の因子

概要

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In our previous paper, the needle temperature was theoretically derived as the equation. The unknown parameters of the equation, Q, heat flow into the needle and k, a constant relating to the coefficient of heat transfer, were determined to fit calculated values to the temperature curve of the needle obtained in the experiment. This study has been carried out under the same method as the previous paper for as many as 27 kinds of fabrics. The discussion is held about the relation between fabric factors and Q and k. Consequently, Q/(mCp), temperature increase (m and Cp are mass and heat capacity per unit mass of the needle, respectively), increases with the increase in the values of weight, packing volume and shear stiffness of fabrics. k/kc, heat transfer into the fabric (kc is same definition as k, but it is measured by taking away fabric.), increases with the increase in the values of shear stiffness of woven fabrics, and the increase in the values of weight, tensile energy and thermal conduction of knitted fabrics. The equilibruim temperature of the needle is estimated by the experimental equation using the values of fabric factors.