Assessment of INGEDE Method in Different Laboratories and Protocol Modifications

Two samples of LWC heat-set offset printed substrates were tested according to INGEDE Method 11. The INGEDE Method was modified to provide continuity between the TAPPI testing standards and the INGEDE Method and enhance both the ease of testing and reliability of the test results. The main modifications include the procedure of test sheet preparation of pulp (TAPPI Standard T 272 applied at WMU), and the Ink Elimination values (ERIC measurements according TAPPI Standard T 567 applied at WMU). The results obtained at WMU were statistically analyzed and found to be consistent with the data obtained from INGEDE Laboratories and the data published in the literature. All individual optical properties considered in this experiment reached the criteria of deinkability.