Pala, HelenaMota, ManuelGama, Francisco Miguel2009-08-122009-08-122004PALA, Helena; MOTA, Manuel; GAMA, Francisco Miguel - Enzymatic versus chemical deinking of non-impact ink printed paper. Journal of Biotechnology. Vol. 108, n.º 1 (2004), p. 79-89.0168-1656http://hdl.handle.net/10400.8/81Enzymatic versus chemical deinking is examined for MOW and photocopy prints. Several enzymatic preparations and two fibre/ink particle separation methods are tested. Deinking was monitored by image analysis and standard pulp and paper characterisation procedures. The effectiveness of the fibre/ink particle separation method depends on the ink particle’s size: for smaller particles a washing step is recommended whereas for larger particles, the use of flotation is necessary. The enzymatic treatment is a competitive alternative for MOWand photocopy paper deinking. However, the process requires the selection of an adequate enzymatic preparation for each paper grade.engPaper pulpsNon-impact inksDeinkingEnzymesImage analysisjournal article