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Enzymatic solution for recycled fibres
After reading this article you will..
- know that enzymes are proteins by chemical nature and originate from living organisms and they are designed for very specific tasks, for instance the selective degradation of hemi celluloses.
- understand that enzymatic fibre surface attack enables enhanced strength or reduced beating energy, improves separation of attached impurities in particular printing colours (enzymatic drinking).
- understand that selective and efficient performance requires tailor-made enzymes or enzyme blends for each specific process conditions.
- learn that enzymes are sensitive to elevated temperatures (can be passivated by heating) and require appropriate pH.
Recycled fibre
- Legislation
- Sources and quality of paper for recycling
- Recyclability of paper and board products – Deinkability
- Recycling versus recyclability
- Technical aspects of recycling
- Relevance of recyclability
- Repulpability and deinkability
- Deinkability test methods
- EPRC deinkability assessment
- Deinkability of different printed products
- Removability of adhesive applications
- EPRC assessment on removability of adhesive applications in graphic paper products
- Unit operations and equipment in recycled fibre processing
- Design of processes
- Design principles for stock preparation processes
- Process design for graphical grades, news print
- Process design for tissue
- Process design for board and packaging grades
- Reject and Sludge handling for graphical and tissue applications
- Reject and Sludge handling for board and packaging applications
- Water management
- Additives
- Deinking
- Bleaching of deinked pulp
- Process water treatment
- Sticky control – detackification
- Enzymatic solution for recycled fibres
- Papermaking potential of recycled fibre
- Differences between virgin and recycled fibre
- Repeated (manifold) recycling experiments
- Multiple papermaking with recycled fibres
- Modelling of fibre age distribution
- Special request of recycled fibre furnish in papermaking
- Effects of recycled fibre in papermaking
- Challenges of increased recycled fibre utilisation
Authors & references
Authors:
Roland Pelzer, James G. Tausche, Dr Jianhu Ma; Manuel Fuzy, Joerg Polste
Based on: Papermaking Science and Technology, book 7, Recycled fibre and deinking, Höke U. and Schabel S. (Book editor). Chapter 7 Additives. Jyväskylä, 2000, Fapet Oy. More references can also be found in this chapter.
References:
- T. Welt and R. J. Dinus, “Enzymatic Deinking – A Review.,” IPST Technical Paper Series Number 542., 1994.
- J. H. Ma and C. L. Jiang, “Enzyme Applications in the Pulp and Paper Industry.,” Progress in Paper Recycling, Vol. 11(3), pp. 36-47, 2002.
- P. K. Bajpai, “Solving the Problems of Recycled Fiber Processing with Enzymes.,” BioResources 5(2)., 2010.
- EDT, “Better Results with Enzyme-Based Technologies: Overview.,” 2020. [Online]. Available: https://www.edt-enzymes.com/.
- EDT, “Practical Biotechnology for the Pulp & Paper Industry: Expanding Enzyme Applications.,” 2003.
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This page has been updated 16.11.2021
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