Abstract
A sewing needle is penetrated and withdrawn through fabrics during the sewing process. This penetration-withdrawal process causes an increase in the needle temperature by friction between the needle and the fabrics. A simultaneous measurement of force and temperature revealed that, in the process of machine sewing, the penetration resistance against the needle change with the rise in the temperature due to frictional heating. The penetration force with the change of the needle temperature, in case of using the polyester/cotton mixed fabrics, decreased until the needle temperature rised to 140°C. In case of polyester filament yarn fabrics, it showed a minimum value at about 80°C. On the other hand, the friction coefficient of the yarn constructing the sewn fabrics decreased with the increase in temperature. In case of polyester/cotton mixed fabrics, it decreased monotonously until 140_??_150°C, and remained constant after that. In case of polyester, it showed a minimum value at 80°C. From these facts, it is considered that the penetration force depends on the change of the friction coefficient with the rise in temperature.
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