Toner Surface-Charge Density in Two-Component Development System.

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  • 二成分現像系におけるトナー表面電荷密度
  • 2成分現像系におけるトナー表面電荷密度--トナー粒子径効果
  • 2セイブン ゲンゾウケイ ニ オケル トナー ヒョウメン デンカ ミツド トナ
  • — トナー粒子径効果 —
  • — Effect of Toner Particle Size —

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Triboelectric-charging and the two-component development system with insulative carrier have been studied by varying the toner surface-area median size (d50) from 6.8 to 13.5 μm and the carrier surface-area median size (D50) from 43 to 106 μm.<BR> It has been found that the development efficiency is determined by surface-charge density (q/st) of the toner particles independent of the toner size (d50), rather than by the charge-to-mass ratio (q/m) as formulated by Schein and by the other workers, and that triboelectric-charging is should more likely be described by q/st as a function of surface area ratio of toner to carrier (nst/sc), as suggested by Kurita, rather than by q/m as a function of mixing-ratio (X) of toner to carrier. <BR> The developed toner-mass per unit area on a photoreceptor (M/A) has been described by a formula, M/A∝[α-β(q/st)] (where α and β are numerical constants), in the experimental range of q/st from 3.5 to 7.0 nC/cm2. The triboelectric-charging has been discussed from a view of phenomena entirely concerned with the surface of toner and insulative carrier particles.

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