Enzymatic versus chemical deinking of non-impact ink printed paper

摘要

Enzymatic versus chemical deinking is examined for MOW and photocopy prints. Several enzymatic preparations and twofibre/ink particle separation methods are tested. Deinking was monitored by image analysis and standard pulp and paper characterisationprocedures. The effectiveness of the fibre/ink particle separation method depends on the ink particle’s size: for smallerparticles a washing step is recommended whereas for larger particles, the use of flotation is necessary. The enzymatic treatmentis a competitive alternative for MOW and photocopy paper deinking. However, the process requires the selection of an adequateenzymatic preparation for each paper grade.