Pulping and biorefining
- General approach and principles
- Extraction-based methods
- Separation of valuable extractives from trees
- Choosing the right solvent – hydrophobic or hydrophilic?
- Stemwood extractives-based products
- Operation modes and procedures in industrial extraction processes
- Exudate gums and latexes
- Hot-water extraction
- Wood extractives – general description
- Factors contributing to the loss of extractives
- Chemical changes in extractives during storage
- Bark extractives – terpenes and terpenoids
- Bark extractives – polyphenols and other minor compounds
- Use of deep eutectic solvents
- Chemical and biochemical conversion
- Thermochemical conversion
- Kraft pulping
- Wood material handling systems
- Pulping process-general approach
- Pulping technologies
- Drying of chemical pulps
- Chemical (market) pulps drying plant applications
- Recovery of cooking chemicals and by-products
- Integrated biorefinery concepts
- Oxygen-alkali delignification
- Delignifying or lignin-removing bleaching
- Other delignification methods
- Chemimechanical pulping
- Mechanical pulping
- Pulp characterisation and properties
Grindstones The grinder’s production rate, the specific energy consumption and the quality of the pulp produced are dependent on several factors, such as the grinding process, the type of grinder, the wood species and wood quality and the target pulp properties. However, in meeting end-product quality requirements, choosing the right type of grindstone and conditioning
Authors & references
Authors:
Raimo Alén, University of Jyväskylä and Victoria Lindqvist, Forest Products Engineers have modified the text from the reference “Karojärvi, R., Haikkala P., Liimatainen, H., Lucander, M. and Tuovinen, O. 2009. Grinding and pressure grinding. In: Lönnberg, B. (Ed.). Mechanical Pulping. 2nd edition. Paper Engineers’ Association, Helsinki, Finland. Pp. 116−173”.
References:
- Karojärvi, R., Haikkala P., Liimatainen, H., Lucander, M. and Tuovinen, O. 2009. Grinding and pressure grinding. In: Lönnberg, B. (Ed.). Mechanical Pulping. 2nd edition. Paper Engineers’ Association, Helsinki, Finland. Pp. 116−173.
- Bechamp, R. 1987. Fundamentals of abrasives and pulpstones. Mechanical pulping course, Manoir Du Lac Delage, Quebec, Canada.
- Kärnä, A. 1984. Studies of Pressurised Grinding. Doctoral Thesis. Helsinki University of Technology, Espoo, Finland. 88 p.
- Sandås, E. and Lönnberg, B. 1990. Part 2. Effects of pulpstone grits in wood grinding. Paperi ja Puu 72(8):765−771.
- Atack, D. and May, W. D. 1962. Mechanical pulping studies with a model steel wheel. Pulp and Paper Magazine of Canada 63(1):T10−T20.
- Lucander, M. and Björkqvist, T. 2005. New approach on the fundamental defibration mechanisms in wood grinding. Proceedings of 2005 International Mechanical Pulping Conference, June 7−9, 2005, Oslo, Norway. Pp. 149−155.
- Sollinger, H,-P. 1982. Die Temperatur und der Druck als Einflussgrössen auf die Holzschliffqualität beim Holzschleifverfahren. Doctoral Thesis. RWTH Aachen University, Germany.
- Lucander, M., Lönnberg, B. and Haikkala, P. 1983. The effect of stone surface modifications on groundwood properties. Proceedings of 1993 International Mechanical Pulping Conference, TAPPI, Washington DC, USA. Pp. 79−86.
- Widdifield, D., Frazier, W., Stationwala, M., Jardine, C. and Broderick, L. 1995. Grooved pulpstones: a statistically based mill evaluation. Proceedings of International Mechanical Pulping Conference, June 12−15, 1995, Ottawa, Canada. Pp. 49−59.
- Manner, H., Reponen, P., Vahteri, R. and Kärpänen, T. 1995. Effect of water jet pulpstone conditioning on mechanical pulp and paper quality at Anjala paper mill. Proceedings of International Mechanical Pulping Conference, June 12−15, 1995, Ottawa, Canada. Pp. 35−44.
- Puurunen, A. 1997. Effect of water jet conditioning on low freeness pulp at the Rauma paper mill. Proceedings of 83rd Annual Meeting, Technical Section of CPPA, January 28−31, 1997, Montreal, Canada. Pp. B157−B160.
- Puurunen, A., Blomqvist, S. and Ora, M. 1997. First mill scale experiences of the Water Jet pulpstone conditioning system at UPM-Kymmene Voikkaa and Rauma Paper Mill. Proceedings of TAPPI Pulping Conference, October 19−23, 1997, San Francisco, CA, USA.
- Tuovinen, O. 2005. Water Jet Control for reduced CSF variation. Proceedings of PGW Usersʼ Seminar, September 2005. Pp. 317−322.
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This page has been updated 25.05.2021