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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.

Document Type: Research Article

Publication date: 2011-01-01

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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