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Evaluation of furnishes for tissue manufacturing; suction box dewatering and paper testing
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.ORCID iD: 0000-0002-5864-4576
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.ORCID iD: 0000-0001-9545-7836
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 1, 143-150 p.Article in journal (Refereed) Published
Abstract [en]

Water removal on a tissue machine becomes progressively more difficult and expensive in each successive zone. A good way to reduce cost can therefore be to improve the dewatering prior to evaporative drying. This can be done by selecting proper raw materials and optimizing the treatment of the fibres in the furnish.

In this work, four pulps beaten to different levels were studied in vacuum dewatering trials. Mixing of the pulps, common in tissue manufacturing, was also performed. To simulate the suction boxes on a tissue machine, bench-scale laboratory equipment was used. Conditions typically used on a tissue machine regarding dwell times and vacuum levels were chosen. Paper properties relevant for tissue, like wet strength and absorption were measured on non-creped papers. To obtain information about the fibre properties, fibre characterization and microscope studies were also conducted.

Vacuum dewatering in tissue manufacturing is shown to be affected by the choice of pulp which can be explained by structural differences in the networks caused by variations in fibre properties. Beating has a strong negative impact on the solids contents reached, which is believed to be an effect of both internal and external fibrillation. These results, together with additional data from mixing and paper testing, give a better understanding of how the furnish should be prepared to reduce energy use in the process and still fulfil consumer requirements on properties.

Place, publisher, year, edition, pages
Stockholm: Nordic pulp and paper , 2012. Vol. 27, no 1, 143-150 p.
Keyword [en]
Beating, Fibre properties, Mixing, Solids content, Suction box dewatering, Tissue, Water removal
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-14541DOI: 10.3183/NPPRJ-2012-27-01-p143-150ISI: 000311019900017OAI: oai:DiVA.org:kau-14541DiVA: diva2:545854
Available from: 2012-08-21 Created: 2012-08-21 Last updated: 2016-10-04Bibliographically approved
In thesis
1. Evaluation of Furnishes for Tissue Manufacturing
Open this publication in new window or tab >>Evaluation of Furnishes for Tissue Manufacturing
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Water removal on a tissue machine becomes progressively more difficult and expensive in each successive zone. Since a big part of the cost is allocated to the drying section, improved water removal in the wet end may lead to huge savings in the manufacturing process. This can be accomplished by selecting proper raw materials and optimizing the treatment of the fibres in the furnish.

The aim of the work described in this thesis was to investigate the influence of three particular furnish properties on dewatering of low grammage papers in the forming and press section; fibre species, beating and additives. The focus was to evaluate how the solids content varies as these furnish properties are changed, but also how the quality of the end product is affected.

Water removal during suction is affected by the choice of pulp which can be explained by structural differences in the networks caused by differences in the morphology of the fibres. The total area of straight pores between the fibres is much higher for softwood pulps compared to hardwood pulps which will facilitate transport of both water and air through the sheet. Beating has a negative effect on the solids content reached in vacuum dewatering which can be coupled to internal and external fibrillation of the fibres.

Water removal during pressing is affected by the choice of pulp controlled by the pore structure of the fibres and the ability to sorb water. More available water before pressing lead to that more water can be removed. Beating mainly delaminates macropores with small effects on micropores. Both water between the fibres and water in macropores is removed during wet pressing.  

The dryness after wet pressing is increased by addition of a wet strength agent (PAE) to the stock, probably due to crosslinking in the fibre wall. PAE-resins decrease the volume of both micro- and macropores which will leave less water deposited in the fibre wall. Tensile strength is increased with a wet strength agent and further increased by addition of a flocculant and a micropolymer to the stock. A lower absorption capacity is achieved with addition of PAE-resins due to formation of covalent bonds in the fibre wall.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2012. 51 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2012:42
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-14544 (URN)978-91-7063-449-9 (ISBN)
Presentation
2012-10-19, 9C204, Karlstads Universitet, Karlstad, 10:15 (English)
Opponent
Supervisors
Available from: 2012-10-15 Created: 2012-08-21 Last updated: 2014-10-28Bibliographically approved

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