| Summary: | 碩士 === 逢甲大學 === 紡織工程所 === 94 === The aim of this study is to improve the demerits of electric heater made of resistance wire in comment daily usage and to save energy consumption and to achieve high temperature (above 250 ℃).
The study adopts a more simple manufacturing process to make a heating plank that is made of electrothermal film instead of resistance wire. The used conductive paste in this study is composed of antistatic powder /silver colloids paste and the graphite powder /solder paste, respectively.
The manufacture was conducted by two approaches, one was the screen printing and the others was dipping and padding that the paste was dipped and padded onto the fabric to form the electrothermal film on a ceramic substrate.
The results show the dipping and padding process is inappropriate for a high temperature heating. The surface resistance of the electrothermal film is decreased with quantity increment of silver powder and graphite. The threshold value of Percolation appeals a significant descent when the quantity of silver powder and graphite is increased.
Surface resistance and sintering are related to the different structure of conductive powder. The vital factor that influences the surface resistance is the diameter and resistance of the conductive power. The optimal condition for a lowest energy consumption is achieved by the screen printing process with a graphite content of graphite powder /solder paste electrothermal film. With it, the surface resistance is 61.6 Ω, the surface temperature reaches to 300.8 ℃ and the power consumption is 6.9 W.
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