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Effect of External Additive for High Image Quality in Nonmagnetic Single Component Toner

机译：外用添加剂对非磁性单组份碳粉中高图像质量的影响

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摘要

Reduction of the toner particle size is an effective way to achieve high-resolution images in electrophotographic laser printers, yet it causes a decrease in image density and increase in background fog. This paper describes the effect on image quality of an external toner additive during Nonmagnetic Single Component Development (NSCD) using a small-particle-size toner. It was experimentally clarified that toners which include a small-particle additive with a low dielectric constant such as polytetrafluoroethylene (PTFE) provide high image density as a result of a lowered toner charge-to-mass due to a decrease in charge on the toner surface and an increase in the toner mass per unit area on the donor roller. Regarding toners including PTFE particles, image density depends on the ratio of PTFE surface area to that of composite powder. This indicates that the toner charge per particle, q, is proportional to the square of toner particle size, d~2. Moreover, in toners which include PTFE particles, background fog depends substantially on the content of PTFE fines as demonstrated by the size distributions of PTFE particles and our novel toner preparation process, called the admixing-classification process. Balancing the mean size of PTFE particles, the fraction of PTFE fines in these should be reduced to obtain superior quality image with high resolution, high image density and low background fog.
机译：减小调色剂粒径是在电子照相激光打印机中获得高分辨率图像的有效方法，但是却导致图像密度降低和背景模糊增加。本文介绍了在使用小粒径碳粉的非磁性单组分显影（NSCD）过程中，外部碳粉添加剂对图像质量的影响。实验证明，由于调色剂表面电荷的减少，降低了调色剂的质荷比，因此包含低介电常数的小颗粒添加剂（例如聚四氟乙烯（PTFE））的调色剂提供了高图像密度。以及供体辊上每单位面积的墨粉质量增加。对于包括PTFE颗粒的调色剂，图像密度取决于PTFE表面积与复合粉末的表面积之比。这表明每个粒子的碳粉电荷q与碳粉粒径d〜2的平方成正比。此外，在包含PTFE颗粒的调色剂中，背景雾基本上取决于PTFE细粉的含量，这由PTFE颗粒的尺寸分布和我们称为混合分类法的新型调色剂制备过程所证实。为了平衡PTFE颗粒的平均尺寸，应减少其中的PTFE细粉比例，以获得具有高分辨率，高图像密度和低背景雾的高质量图像。

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