Effect of Charging Method and Toner Shape on Charging Characteristics of Mono-component Toner

摘要

Charging characteristics of two types of toners are carried out by two methods. One method is mixing with carrier and the other method is contact with developing roller and blade. To understand the charging mechanism, toner charging by two methods such as developer roller/blade charging and the carrier mixing charging is carried out, and toner charging characteristics of irregular shape toner and rounded toner are compared. Various factors such as toner material, toner manufacturing methods, toner shape, and charging method so on affect on toner charging characteristics. From the viewpoint of toner shape effect, toner charging characteristics are analyzed by E-SPART analyzer. It is obtained that the toner charge dependence on toner size is 2.0th power of the size when toner is charged by carrier mixing, but the dependence is 1.3th power of the size when rounded /irregular toner is charged by roller/blade charging. It is also obtained that toner charge distribution of rounded toner is narrower than irregular shape toner.