Enzymatic versus chemical deinking of non-impact ink printed paper

• Author(s): Pala, H. ; Mota, M. ; Gama, F. M.
• Date: 2004
• Persistent ID: http://hdl.handle.net/1822/1185
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Paper pulps; Non-impact inks; Deinking; Enzymes; Image analysis
• Document Type: Article
• Language: English

Description

Enzymatic 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 MOW and photocopy paper deinking. However, the process requires the selection of an adequate enzymatic preparation for each paper grade.