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Analysis of imaging density degradation by dynamics of toner charging and mass transfer in the toner development process

机译:在调色剂显影过程中通过调色剂带电和传质的动力学分析成像密度下降

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摘要

In the monocomponent non-magnetic toner developing system, optimum toner charging and mass transfer are important factors to produce high quality images. Also the uniformity of the image is one of the most important properties in electrophotography. One major type of nonuniformity is the problem of image density degradation also known as ghosting. In this article this phenomenon is discussed in terms of the toner charging and mass transfer characteristics during the first and subsequent roller revolutions. It was found that although the toner charge and toner mass on the development roller surface are very important parameters they are not the only causes of the imaging density difference. It was also found that the relationship between roller surface properties and toner development efficiency are closely related to the uniformity of the printed image. It is demonstrated that the optimum development roller requires low charge retention on the roller surface and low current leakage between the supply and the development rollers. Finally the design features of a two-layered development roller are described, that provides significant improvement of image density uniformities in continuous development.
机译:在单组分非磁性碳粉显影系统中,最佳的碳粉充电和传质是产生高质量图像的重要因素。同样,图像的均匀性也是电子照相术中最重要的特性之一。不均匀性的一种主要类型是图像密度降低的问题,也称为重影。在本文中,将根据滚筒第一次旋转和随后旋转时的碳粉充电和传质特性来讨论这种现象。已经发现,尽管显影辊表面上的调色剂电荷和调色剂质量是非常重要的参数,但它们不是成像浓度差异的唯一原因。还发现辊表面性质和调色剂显影效率之间的关系与印刷图像的均匀性密切相关。已经证明,最佳的显影辊需要在辊表面上保持低电荷,并且电源和显影辊之间的电流泄漏要低。最后,介绍了两层显影辊的设计特征,该特征可显着改善连续显影中的图像浓度均匀性。

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