Screening of Colorants for Electrophotographic Toners

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As electrophotography has become established, the range of raw materials available has grown. This leads to the development of new colorants that are optimized for this application. For the toner manufacturer this is both a benefit and a problem. Full evaluation of new products involves dispersing the pigment (generally using an extruder) and then milling the dispersion with further ingredients to make a usable toner. This process is acceptable for a few samples of new products but few toner makers would be able to carry it out on every new colorant that comes onto the market. For the colorant maker, the problem is even greater since every new product to reach the market is the result of hundreds of research samples, all of which need to be tested.

There is a need for a screening test that will allow a quick evaluation of the likely colouristic performance of new colorants in toner type systems. This paper introduces two possible techniques. One gives the possibility to screen large numbers of samples for colouristic performance, while the second allows a rapid screening of extruded dispersions without the need to formulate a full toner capable of acceptable printing.

Document Type: Research Article

Publication date: January 1, 2005

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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