液体現像法に関する二三の知見
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In order to clarify the foundamental process of liquid development of electrophotography and electrostatic printing, the adsorption characteristics of carbon black fine powders dispersed in ligroine on the charged surface were studied, varying some experimental conditions. The sample plates were made from coating the VYHH resin (vinyl chloride, vinyl acetate copolymer) on the glass plate on which the chromium is evaporated. The surface charge was given by the corona discharge and measured by sector type electrometer as surface potential (Voltage).The adsorbed quantities of carbon black powder were observed by using the optical densitometer. The experimental equipment is shown in Fig. 1. Fig. 2 shows the charge decay characteristics of insulator surface in both air and ligroine only. In the range of carbon black concentration of 0. 01∼0.1 Wt% under the surface voltage 200 V, the adsorption characterristics are shown in Fig. 3∼6.The initial rate of adsorption in Fig. 3∼6 increases linearly with the carbon black concentration as shown in Fig. 7. The maximum adsorption in each concentration approaches rapidly the saturation state, shown in Fing. 8. The charge decay characteristics by carbon black adsorption are shown in Fig. 9 and 10, and the relation between both intial charge decay rate and maximum charge decay and the carbon black concentration are shown in Fig. 11 and 12 separately. It was observed that these results correspond to the characteristics of adsorption in Fig. 7 and 8. Fig. 13 shows the linear relation between the initial rate of adsorption and the initial decay rate of charge.Adsorption characteristics under the constant carbon black concentration of 0.05 Wt%, varying the surface voltage 0~350 V, are shown in Fig. 14~17. It seemed that the charge characteristics of the initial rate of adsorption with positive surface voltage is not so simple as in the case of constant voltage, except negative surface voltage in which the linear relation can be found as shown in Fig. 18. The relation between the maximum adsorption of carbon black and the initial surface voltage was also not linear but more complicated as shown in Fig. 19.
- The Imaging Society of Japanの論文
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