Adsorption has been used to improve inkjet and flexographic inks removal during pulping. Chitosan was found to be an adequate adsorbent, which was able to remove 50-70% of ink from an ink/water solution in 30 minutes. Although, adsorption deinking was not effective when using 15% consistency for pulping as specified by method 11, the efficacy was significantly better when the consistency was reduced to 10%. When this was done, the ISO brightness and ERIC of 100% inkjet printed newsprint was deinked to above 54 and below 300, respectively.
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