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Evolution of the paper structure along the length of a twin-wire former
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (The forest as a resource)
(FPInnovations)
Graz University of Technology.
2009 (English)In: ADVANCES IN PULP AND PAPER RESEARCH, OXFORD 2009, VOLS 1-3 / [ed] IAnson, SJ, Bury, UK: Pulp Paper Fund. Res. Soc. , 2009, p. 207-245Conference paper, Published paper (Refereed)
Abstract [en]

A particle-level numerical model is used to simulate forming with a twin-wire former configuration. The development of the paper structure along the length of the former is observed to explain the effects ofthe dewatering elements on the paper structure at different jet-to-wire speed ratios, consistencies, and target basis weights. The simulations indicate that most of the structure development takes place in the initial part of forming (forming roll) and, in some instances, at the drop to atmospheric pressure after the forming roll. Dramatic effects onthe through-thickness fibre orientation anisotropy are observed when the consistency is varied by changing the jet thickness, while changes in basis weight had less impact. The through-thickness concentration gradient was almost uniform throughout the forming process, except in the lower range of typical papermaking consistencies. This indicates that the dewatering mechanism is normally thickening, rather than filtration.

Place, publisher, year, edition, pages
Bury, UK: Pulp Paper Fund. Res. Soc. , 2009. p. 207-245
Keywords [en]
Papermking, Forming, Fibre suspension, Simulation
National Category
Chemical Engineering Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:miun:diva-9658ISI: 000281142700007ISBN: 978-0-9545272-6-6 (print)OAI: oai:DiVA.org:miun-9658DiVA, id: diva2:235581
Conference
14th Fundamental Research Symposium on Advances in Pulp and Paper Research
Projects
The forest as a resourceAvailable from: 2009-09-16 Created: 2009-09-16 Last updated: 2010-10-05Bibliographically approved

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Lindström, StefanUesaka, Tetsu

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CiteExportLink to record
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  • apa
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