The Digital Print Deinking Alliance (DPDA) has revealed that a study conducted by Centre Technique du Papier, (CTP) of Grenoble, France, inkjet prints were successfully deinked in a procedure designed to replicate a typical European mixed grade wastepaper recycling system.
The test samples were printed using standard aqueous dye based inkjet inks on uncoated woodfree paper. In the study, nearly all colorants 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 chemical used in the repulping step. In both cases, the bleached pulp met the deinked pulp quality requirements.
“This is very encouraging as a first study” said 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.”
DPDA research will continue with other types of inkjet inks and paper combinations.
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