| 摘要 |
<p>PURPOSE:To provide a temperature self-control heating element of high perfor mance by mixing a specific ratio of spherical of specific average grain size or expansion graphite power, with a varnish-like mixture containing a thermo plastic resin and carbon black. CONSTITUTION:Spherical carbon of average grain size of 2-30mum or expansion graphite power of average diameter of no more than 5000mum, is mixed with a varnish-like mixture containing a thermoplastic resin and carbon black, and a conductive composition is provided. A miximg ratio of both components is 5-95 weight parts for spherical carbon to 100 weight parts of the varnish-like mixture. Silver electrodes 4 for supplying power to a heating element are provided on an insulated substrate 3 consisting of a film and a non-woven fabric and the like, at two points, and the heating element 5 consisting of conductive composition is formed thereof by screen printing or spraying, and a surface heating element body is formed. A temperature self-control heating element body of high performance, which has excellent uniform heating characteristic as well as wide temperature control range, is thus provided.</p> |
