Deinkability of different secondary fibers by enzymes

Deinkability of different secondary fibers by enzymes AbstractThe efficiency and effects of enzymatic deinking using xylanase and lipase mixed with amylase (XLA) for deinking secondary fibers were investigated for mixed office waste (MOW), photocopy prints (PHOT) and old newspapers (ONP). The optical and physical properties of deinked pulps were evaluated. Changes in fiber morphology, crystallinity index and functional groups were also monitored. The results show that for non-impact prints (MOW and PHOT), a maximum deinking efficiency of 19.9 % and 13.9 % were obtained with enzymatic deinking (XLA), respectively. For ONP, conventional alkaline demonstrated the highest efficiency of 12.20 %. XLA treatment significantly improved the tensile index and tear index of MOW and PHOT but caused a slightly reduction for ONP, relative to respective blank. It was found that kink index and curl index were significantly decreased, caused a 55.6 % reduction in the kink index for PHOT and a 35.8 % reduction in the curl index for ONP. FT-IR observation show that the relative intensity of the alkaline/enzymatic-deinked pulp has changed differently according to the type of wastepaper. These results indicate the synergistic effects of xylanase, lipase and amylase making enzymatic treatment a promising method that can substitute alkaline deinking for non-impact prints. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nordic Pulp & Paper Research Journal de Gruyter

Deinkability of different secondary fibers by enzymes

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Publisher
de Gruyter
Copyright
© 2018 Walter de Gruyter GmbH, Berlin/Boston
ISSN
0283-2631
eISSN
2000-0669
D.O.I.
10.1515/npprj-2018-3014
Publisher site
See Article on Publisher Site

Abstract

AbstractThe efficiency and effects of enzymatic deinking using xylanase and lipase mixed with amylase (XLA) for deinking secondary fibers were investigated for mixed office waste (MOW), photocopy prints (PHOT) and old newspapers (ONP). The optical and physical properties of deinked pulps were evaluated. Changes in fiber morphology, crystallinity index and functional groups were also monitored. The results show that for non-impact prints (MOW and PHOT), a maximum deinking efficiency of 19.9 % and 13.9 % were obtained with enzymatic deinking (XLA), respectively. For ONP, conventional alkaline demonstrated the highest efficiency of 12.20 %. XLA treatment significantly improved the tensile index and tear index of MOW and PHOT but caused a slightly reduction for ONP, relative to respective blank. It was found that kink index and curl index were significantly decreased, caused a 55.6 % reduction in the kink index for PHOT and a 35.8 % reduction in the curl index for ONP. FT-IR observation show that the relative intensity of the alkaline/enzymatic-deinked pulp has changed differently according to the type of wastepaper. These results indicate the synergistic effects of xylanase, lipase and amylase making enzymatic treatment a promising method that can substitute alkaline deinking for non-impact prints.

Journal

Nordic Pulp & Paper Research Journalde Gruyter

Published: May 23, 2018

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