Suspension characteristics The different hornification propensity of different pulp types is most obvious in water retention measurements. For example, the recycling experiments of Korpela1 show the typical behaviour of various pulp types. As discussed in article Differences between virgin and recycled fibre (Figure 3) the WRV of softwood and hardwood chemical pulps decreased considerably from
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Suspension characteristics
After reading this article you will..
- know how suspension characteristics of various pulp types may change during manifold recycling experiments.
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
Author:
Hans Putz
References:
- Korpela, A., Kuitujen kierrätettävyys, Internal Report, KCL, Espoo, Finland, 1994
- Göttsching, L. and Stürmer, L., Pysikalische Eigenschaften von Sekundärfaserstoffen unter dem Einfluß ihrer Vorgeschichte. Teil II: Einfluß des mehrfachen Recycling. Wochenbl. Papierfabr. 126(1978) No. 23/24, p. 909–918
- Law, K.N., Valade, J.L. and Quan, J., Effects of recycling on papermaking properties of mechanical and high-yield pulps. Part I: Hardwood pulps. Tappi J. 79(1996) No. 3, p. 167–174
- Stürmer, L., Über die Eigenschaften von Sekundärfaserstoffen aus Altpapier unter dem Einfluß ihrer Vorgeschichte. pH.D. Thesis, Technische Hochschule Darmstadt, Darmstadt, 1980
- Nazhad M. M., Recycled Fiber Quality – A Review. J. Ind. Eng. Chem. 11(2005) No. 3, p. 314–329
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This page has been updated 16.11.2021
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