DPDA Research Confirms Successful Deinking of Inkjet Printed Papers
It has been recently suggested that inkjet printed papers are not deinkable according to laboratory test conditions known as INGEDE Method 11. This lab test was primarily conceived to compare the deinking performance of gravure and offset prints on wood-containing papers. INGEDE Method 11 is sometimes cited as a simple lab-scale test to compare deinking performance of various printing technologies. “Method 11 may not be appropriate for all aqueous based inks, since the test is primarily a single step flotation test. With dye based inks, there is no ink particle to float, hence the futility of trying to meet this requirement.” said Dr Matthias Fromm, R&D Manager for Oce Printing Systems.
“We wanted to test using conditions that simulate the total paper recycling process for mixed grades of paper, and understand the impact of inkjet printed papers in these commercial recycling systems. This research was conducted using 100% inkjet paper. We estimate that production inkjet’s market share of total graphic printing is less than 1% today. Based on the projected growth rates of inkjet printing, we anticipate the deinking industry is capable at current volumes and that we have a few more years to jointly develop the appropriate technologies of paper, ink and deinking methods to ensure good deinking performance if and when the need arises.” said Fromm.
According to Gregg Lane, Sr. Chemist at 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 environmental impact of print-on-demand solutions using water-based inks.”
The Digital Print De-inking Alliance was founded in 2008 to assess and support research on inkjet print compatibility with de-inking and paper recycling processes. DPDA members currently include four leading manufacturers of high-volume digital printing presses: HP, InfoPrint Solutions Company, Kodak’s Graphic Communications Group, and Océ Printing Systems.