For most printing technologies, the choice of paper is a major factor in determining the deinkability of a paper-ink combination. For this reason, no blanket statements can be made about the deinkability of a printing technology or a printing ink. In many deinking studies with offset printed papers, the dependency of paper on the deinkability result can be clearly seen. Some heat-set and sheet-fed offset printed uncoated papers fail to pass, for example, the INGEDE Method 11 and ERPC Scorecard.
Even more than for most other printing technologies, the choice of the paper-ink combination is the key to success in the deinkability of water-based inkjet printed papers. The deinkability results with these types of ink can range from “excellent deinkability” to “not suitable for deinking” depending on the paper used for printing. Especially in the category of uncoated papers, the range of results is very large, depending on the paper used. An example of the paper dependency in deinking can be seen in the results shown below of a joint study performed by HP and Stora Enso and presented at a TAPPI Peers Conference in 2010.
In order to secure a sustainable paper recycling loop, it is therefore important that printers using water-based inkjet inks utilize a deinkable paper-ink combination. Many paper-ink combinations have already been assessed for their deinkability performance and have shown good results, so there are already many choices available on the market for creating printed papers with water-based inkjet inks which are suitable for deinking.