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Investigations in the Influence of rounded Toner Particles on the Image Quality Parameters

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The advantages and disadvantages of chemically produced toners (CPT) vs. conventionally produced toners by grinding and classifying are top of discussion. All OEM's of CPT contend that their toners are characterized by smaller particle size, tighter particle size distributions and higher consistence in particle shape. The ideal spherical or at least “potato” toner particle shape effects a higher capability of rendering better image quality.

Goal of our investigations was to improve the circularity of conventionally produced toner particles and to correlate the generated particle shape as well as the resulting imaging quality parameters. Test material was an adjusted purchasable CPT that was prepared in the conventional way.

In the first part of this presentation results of systematic investigations according to rounding conventionally produced toner particles will be presented. Extensive tests on a conventional intensive mixer Cyclomix by HOSOKAWA Micron B.V., Doetinchem/The Netherlands, and the new high-intensive mixer NOBILTA by HOSOKAWA Alpine Aktiengesellschaft, Augsburg/Germany, were conducted to evaluate optimal processing conditions.

The second part deals with the consequences of rounding on printing quality parameters like solid black density, ghosting, fixing and level of grey, the correlation of particle circularity and printing quality parameters as well as the comparison of mechanically rounded toner particles to chemically produced toner particles.

First results show that it is possible to generate the desired potato shape by intensive mixing on Cyclomix as well as on NOBILTA, both kinds of intensive solid mixer. The printing tests gave fully satisfying results in almost all criteria and are comparable to CPTs. In order to utilize all benefits of rounded toner quality the entire toner production process must be taken in consideration, i.e. from formulation to blending.

Further investigations including trials on the Fluidics Coating Device will be conducted to optimize the rounding step and to evaluate the optimal mechanically rounding process.

Document Type: Research Article

Publication date: January 1, 2010

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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