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Welcome
Themes
Introduction to forest-based bioeconomy
Wood products
Natural fibre products
Man-made bio-based fibre products
Bio-based nanomaterials
Recycled fibre
Pulping and biorefining
Energy and biofuels
Biomass chemistry and physiology
Material testing and product properties
Forests and other biomass resources
Supply chain
Process control and automation
Asset management
Business and investment planning
Environmental control and management
Learning paths
Learning path A
Learning path B
Other resources
Papermaking Science and Technology books
Podcasts
Webinars
Tools
How to use
Dictionary
Glossary
Contact
Contact us
Contributors
Profile
Special request of recycled fibre furnish in papermaking
After reading this article you will..
know that materials (contaminants) in paper for recycling pulp make the big difference in using recycled fibres instead of virgin fibres.
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Authors & references
Author:
Hans Putz
References:
EN 643:2014-11, Papier, Karton und Pappe – Europäische Liste der Altpapier-Standardsorten. Beuth Verlag, Berlin, 2014
Videos
Exercises
This page has been updated 16.11.2021
Content
Recycled fibre
Legislation
Statistics on paper for recycling in 2019
Legislative framework for the use of paper for recycling in Europe
Sources and quality of paper for recycling
Collection systems of paper for recycling
Dry sorting of paper for recycling
Design of collection systems
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
Differentiation by printing technology
Deinkability of offset prints
Deinkability of rotogravure prints
Deinkability of flexographic prints
Deinkability of toner prints
Deinkability of inkjet prints
Removability of adhesive applications
EPRC assessment on removability of adhesive applications in graphic paper products
Unit operations and equipment in recycled fibre processing
Fluid mechanics of pulp suspensions
General overview of unit operations
Separation processes
Slushing and repulping
Machinces for slushing and repulping
Cleaning (separation in centrifugal field)
Basic physical principles of hydrocyclones
Operation and installation of hydrocyclones
Screening
Barrier and probability screening
Basic screening machines design
The passage of fibres through apertures
Machines for coarse screening
Machines for fine screening and fractionation
Effects of machine and operation parameters on screening results
Flotation
Design of processes
Design principles for stock preparation processes
Sizing and balancing
Process engineering issues
Concept optimisation in terms of cost and technology
Process design for graphical grades, news print
Process design for higher quality printing and writing grades
Process design for market deinked pulp
Process design for tissue
Process design for board and packaging grades
Process design for testliner and corrugated medium
Process design for board grades
Reject and Sludge handling for graphical and tissue applications
Reject and Sludge handling for board and packaging applications
Water management
Additives
Deinking
Requirements for successful ink removal
Chemistry for ink detachment
Ink removal by flotation
Ink removal by washing and synthetic surfactants
Foam control in flotation units and masking agents
Bleaching of deinked pulp
Wood -containing DIP
Wood -free DIP
Special aspects of DIP bleaching
Lignin-preserving bleaching
Peroxide bleaching (P)
Dithionite bleachnig (Y)
FAS bleaching (FAS)
Combined bleaching stages
Lignin-degrading bleaching
Bleaching with chlorine-containing chemicals
Bleaching with oxygen chemicals – oxygen bleaching (O)
Ozone bleaching (Z)
Alternative bleaching processes
Fibre fractionation in DIP bleaching
OBA decomposition
Colour stripping
Process water treatment
Dissolved air flotation (DAF)
Additional techniques for process water treatment
Sticky control – detackification
Fixation and other sticky control options
Enzymatic solution for recycled fibres
Papermaking potential of recycled fibre
Differences between virgin and recycled fibre
Fibre morphology and flexibility
Chemical conditions on fibre flexibility
Surface chemistry of fibres
Repeated (manifold) recycling experiments
Design of recycling experiments
Suspension characteristics
Sheet characteristics
Other characteristics
Multiple papermaking with recycled fibres
Graphic paper
Packaging paper
How often can a fibre be recycled?
Modelling of fibre age distribution
One-parameter model
Multi-parameter model
Model of PTS
Model of CEPI and EPRC
Special request of recycled fibre furnish in papermaking
Classification of contaminants
Effects of contaminants on recycled pulp quality
Effects of recycled fibre processing on pulp characteristics
Effects of recycled fibre in papermaking
Carry-over and wet-end chemistry
Water consumption in recycled fibre processes
Anionic trash
COD and dissolved and colloidal material
Removal of dissolved and colloidal material
Challenges of increased recycled fibre utilisation
Point of view: paper usage
Point of view: availability of paper for recycling
Point of view: design of paper and board products
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