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Effect of Filler Distribution and Caliper Variations on Toner Transfer in Electrophotographic Printing

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Print density mottle in solid black electrophotographic printing was shown in a previous report to be strongly linked to the distribution of PCC fillers in paper. A model of toner transfer showed qualitatively that toner transfer efficiency is locally increased in regions of high filler density. In this report we extend the previous work by quantifying effect of filler distribution and of paper calliper variations on toner transfer in electrophotography. We modeled the complete electrostatic force field structure within a paper-air-toner transfer gap during electrophotography. By relating effective local dielectric constant to filler concentration, we computed the difference effects that surface and bulk PCC fillers have on the local toner transfer force field. The toner transfer force was found to be higher when the PCC filler was distributed homogeneously throughout the bulk thickness rather than localized at the surface of the paper. Quantitative model of in-plane variations in toner transfer force as a function of corresponding in-plane variations of the effective paper dielectric showed that the variation in paper dielectric on the scale of 500μm or larger contribute significantly to toner transfer force variations. We also found that the higher filler content amplified the effect of caliper non-uniformities on the toner transfer force variations.

Document Type: Research Article

Publication date: January 1, 2004

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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