Abstract
The effect of surface composition of a development roll (mixture of the acrylic resin and the polyurethane) on the toner charge was investigated. The specific toner charge increased with the content of acrylic resin. The mass of toner layer coated on the development roll also increased with the content of acrylic resin because of the increased adhesion force between the toner and the development roll. The current was passed at the blade, the development roll and the supplying roll during the charging. The direction of current at the blade suggested that the blade worked for the charging to toner particles. On the other hand, the development roll worked for the discharging when the content of acrylic resin was less than 40%, while it worked for charging at the content higher than 40%. The charge distribution of toner particles was wider with increasing the acrylic resin because of the charging effect at the development roll.
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