Influence of paper and ink on deinking of inkjet prints

Hewlett-Packard (HP) is actively engaged in external and internal research to ensure that deinkability of the current recycled paper streams is maintained as the percentage of digital prints in deinking mill furnish increases. As part of this effort, HP is working to understand how ink and paper interactions affect the flotation deinking process. Results continue to show that paper type and design can positively affect deinking of HP inkjet ink used in HP digital inkjet presses. Results will be shown for the use of aggregation-enhancing chemistries on the paper as well as different paper coating technologies. Results will also be shown for a prototype ink demonstrating improved deinkability on different substrates. In addition, HP is closely examining deinking process parameters used in deinking mills to understand which parameters significantly affect inkjet deinking, and how to best develop improved deinkability assessment methods.