Electrical Properties of a Magnetic Brush Using a High Resolution Field Probe

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Abstract:

Dry powder xerographic marking systems are capable of high quality printing but there is still need to improve their capabilities to better compete in offset markets. Many of these systems use two component magnetic brush technology to develop latent electrostatic images. The electrical properties of the developer material which makes up the magnetic brush play a large role in the quality of the developed image. Our desire to improve image quality characteristics affected by development has led us to explore the magnetic brush in more detail.

We have used a high resolution electric field probe to characterize the dielectric constant and conductivity of a two component developer in a magnetic brush. Standard techniques use large area cells which look at the integrated properties of the developer material and cannot resolve variations at the spatial scales that are relevant for image uniformity. Magnetic brush structure is likely to translate into local electric field variation during the development process producing variations in toned image density on the photoreceptor and ultimately in the final printed image. Variations in electrical properties due to position in the development zone and magnetic field are looked at and discussed in the context of image quality. Realistic particle simulations are compared to experimental data.

Document Type: Research Article

Publication date: January 1, 2007

More about this publication?
  • 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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