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Evolution of the paper structure along the length of a twin-wire former
Mid Sweden University. (FSCN)ORCID iD: 0000-0002-1503-8293
Mid Sweden University. (FSCN)
Graz, Austria.
2009 (English)In: 14th Fund. Res. Symp. / [ed] I’Anson, S. J., The Pulp and Paper Fundamental Research Society , 2009, Vol. 1, 207-245 p.Chapter in book (Refereed)Text
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 of the 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 on the 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
The Pulp and Paper Fundamental Research Society , 2009. Vol. 1, 207-245 p.
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:liu:diva-125211OAI: oai:DiVA.org:liu-125211DiVA: diva2:903627
Available from: 2016-02-16 Created: 2016-02-16 Last updated: 2016-02-26

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Lindström, Stefan B
Paper, Pulp and Fiber Technology

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