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DPDA confirms successful deinking of inkjet printed paper

Jun 16, 2010 12:00 AM

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Océ announces the Digital Printing Deinking Alliance (DPDA) shared the first of a series of scientific research investigations into the deinkability of inkjet printed papers at the PTS Deinking Symposium held recently in Munich, Germany. Océ is a member of DPDA, along with HP, InfoPrint Solutions Co. and Kodak’s Graphic Communications Group.

In a study conducted by a leading research organization and expert in the field of recycling technologies, Centre Technique du Papier (CTP) of Grenoble, France, inkjet prints were successfully deinked in a procedure designed to replicate a typical European mixed grade waste paper recycling system.

Presenting on behalf of the DPDA, Gary Williams, PE, Paper Scientist of InfoPrint Solutions Co., reviewed the CTP research data with leading industry experts gathered at this international Deinking Symposium. “Our first study was intended to prepare a baseline for future testing of inkjet prints. We were pleasantly surprised to learn that all samples proved to be successfully deinked in test conditions that included bleaching,” said Williams.

The test samples were printed using standard aqueous dye-based inkjet inks on uncoated woodfree paper. DPDA members prepared blind samples using three representative dye-based inksets for the study and tested under conditions designed to be representative of current deinking technology for processing mixed grades of recovered paper. In the study, all colorants tested were successfully deinked when hydrosulphite bleach was added after the repulping process. In one case, ink colorants were successfully deinked using peroxide only, which is a typical chemistry used in virtually all repulping systems. In both cases, the bleached pulp met the deinked pulp quality requirements.

“This is very encouraging as a first study,” says David Hatfield, R&D Manager for Kodak. “It provides some fact-based data that confirms what we have believed from over 40 years of inkjet printing. Most commercial recycling systems are robust and we have yet to observe a failure in any recycling system worldwide.”

According to Gregg Lane, Sr Chemist for HP, “DPDA research will continue with other types of inkjet inks and paper combinations. It is important for the DPDA members that we work collaboratively with INGEDE and the paper industry. The benefits of inkjet printing are tremendous and it will penetrate many offset printing markets such as publishing and direct mail, bringing with it the reduced carbon footprint of print-on-demand solutions.”