The Usefulness of Two-Side  ERIC Buchner Handsheets for Deinking Agent Development, 20PEERS Conference

In the recent review of the TAPPI Official Test Method T 567  “Determination of effective residual ink concentration (ERIC) by infrared reflectance measurement it was noted that the method requires a uniform ink distribution, formation, and grammage in all three dimensions thus making the TAPPI T 218 “Forming Handsheets for Reflectance Testing of Pulp (Büchner Funnel Procedure),” not effective for ERIC analysis. Yet, the use of the Büchner Funnel has been the common procedure for preparation of handsheet pads at mill and lab scale for the industry. The paper will look at how the two‐sidedness or non‐uniform ink distribution of ink can be useful in evaluating and selecting deinking agents for newsprint deinking. It is uncommon to discuss two‐sidedness in reports or technical papers with respect to mill surveys, deinking performance, or development of new deinking products. However, seeing this difference in the process of developing new deinking chemistry can be helpful in advancing the art of deinking. The paper will look at what has been seen in mill settings and in development of deinking agents at lab scale. In a review of industrial and laboratory scale studies Two‐Sideness has on ERIC was found to be useful in over 80% of the studies. 

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