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Recent developments in the Deinking of Inkjet and Liquid Toner

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For the first time, liquid toner prints in the raw material of a paper mill have caused a significant damage in a recycling paper mill. This incident confirms former lab tests that for the last ten years have pointed at a possible contamination already by small amounts of liquid toner prints.

Water based inkjet ink is another challenge for the deinking process. This process has been designed to separate hydrophobic ink particles from hydrophilic cellulose fibers. Soluble dyes cannot be removed as they stay and accumulate in the circulation water. Thus additional bleaching steps have been suggested to make up for the loss in brightness. However, bleach is not an option for the majority of paper mills producing newsprint and other graphic papers from the household mix. It is neither economical nor ecological as one would have to add equipment and increase the use of chemicals as well as the chemical load of the effluent.

Therefore, other solutions look more sustainable: inkjet inks that either are not water based or coagulate to form larger, hydrophobic particles on the paper surface. Promising approaches by KAO, Sepiax and Xerox have been tested whether this solution – originally intended to improve image quality – also helps to match state-of-the-art deinking technology.
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Document Type: Research Article

Publication date: 01 January 2011

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  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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