Deinking of HP digital commercial 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 for both inkjet and liquid electrophotography affect the flotation deinking process. Results increasingly indicate that paper type and design affect deinking of both types of HP digital prints. Results will be shown for the use of aggregation-enhancing chemistries on the paper as well as different paper coating technologies. In addition, HP is closely examining deinking process parameters used in deinking mills to understand how they interact with our various ink chemistries. The collector chemistry used in flotation deinking plays an important role and herein we will discuss the effect of natural and synthetic collectors on the deinkability of our inkjet technologies.