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Modeling Electrophotographic Developer Flow with a Viscous Fluid Flow Model

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Abstract:

In laser printers, the developing station forms toner images on the photoconductor drum surface. The primary concern for formation of stable toner images is obtaining smooth developer flow. Then, observation of the developer flow at a free surface in an actual developing station has been done. For better flow optimization, developer flow details such as local flow velocity vectors and streamlines, not only at the free surface but also in the developer flow, should be clarified. A simulation method for optimizing the flow was examined.

In the simulation method, a large calculation domain in the developing station is required. Therefore, viscous fluid analysis to minimize the calculation load is employed. Viscosity should be defined as fitting the developer particle flow. To do this, viscosity measurements were carried out. It was found that the developer flow should be non-Newtonian fluid, in which viscosity is proportional to the reciprocal of its shear rate. This means that shear stress in the developer flow should be constant.

This property was used to simulate the developer particle flow behavior successfully, even in three-dimensional models. Flow details, on both large and small scales in the developing station, could be observed.

Document Type: Research Article

Publication date: January 1, 2001

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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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