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Deinking of Inkjet Prints

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Abstract:

The study investigates the deinkability of inkjet printed products and shows the influence of printing paper and inkjet ink on deinkability. Test prints were produced on high-volume inkjet printing systems using different papers but the same image and print settings.

Tests included a standard laboratory deinking procedure for ink removal (INGEDE Method 11) as well as a VOITH test method of pulp bleaching, applying standard bleaching agents and chemical concentrations. Assessment of deinking results was based on the deinking scorecard promoted by the European Recovered Paper Council.

The tests showed good deinkability for 70 % of the test prints with pigment-based inkjet inks and their deinkability was clearly influenced by the printing paper. In contrast, deinking of dye-based inkjet prints was strongly influenced by both the type of paper and inkjet ink (only 20 % of the test prints showed good deinkability). All dyes, however, were capable of being bleached by common reductive bleaching agents. It was further shown that the deinkability of a recovered paper mix containing inkjet prints depends on the type and proportion of inkjet print products.

The study also identified paper properties (surface tension, paper components) that are responsible for good or poor deinkability.

Document Type: Research Article

Publication date: January 1, 2013

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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