Reject and sludge handling for board and packaging applications The pulping system of a stock preparation for board and packaging paper can consist of an LC-(low consistency) pulper system or a drum pulper system, likewise (see Figure 1). The LC-pulper systems are mainly fed with manual or machine cut wired bales. These wires will
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Reject and Sludge handling for board and packaging applications
After reading this article you will..
- be able decide which filtrates should be sent to the effluent treatment system
- know which kind of rejects are treated in a machine combination of gravity table and sludge press
- be able describe the task of shredders and metal separators
- be able discuss the benefit if reject from the approach flow system is fed to the stock preparation
Content
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:
Falk Albrecht, Sebastian Schuster, Fanny Bader, Eckhard Gutsmuths
Videos
Exercises
This page has been updated 17.11.2021
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