The effect of fines on dewatering, wet and dry web properties

H. Lindqvist, Kristian Salminen, Janne Kataja-Aho, Elias Retulainen, P. Fardim, A. Sundberg

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2 Citations (Scopus)

Abstract

Speed of paper machines is often limited by the drainage rate of the furnish and the mechanical properties of the wet web, i.e. the tension and relaxation properties. In this study, the effects of the fibre properties and fines content on dewatering, dry and wet web properties were determined. The share of long fibres decreased only slightly when the pulp was refined in the Valley beater. More fibre cutting occurred during refining in the ProLab refiner. Tests showed that refining of pulp from SR20 to SR30 and SR70 using a Valley beater or a ProLab refiner increased the dewatering time. The wet and dry tensile strength as well as the residual tension of the wet web at 2% strain also increased. Removal of fines shortened the dewatering time and decreased the wet and dry tensile strength, and the residual tension compared to pulps containing fines. Addition of fines increased the dewatering time as well as the dry and wet tensile strength. The fibre properties affected the residual tension more than the fines content, while the fines content was more important for the wet tensile strength
Original languageEnglish
Title of host publicationPaperCon 2011
PublisherTAPPI Press
Pages448-455
ISBN (Print)978-161839443-9
Publication statusPublished - 2011
MoE publication typeA4 Article in a conference publication
EventPaper Conference and Trade Show, PaperCon 2011 - Covington, United States
Duration: 1 May 20114 May 2011

Publication series

Name
Volume1

Conference

ConferencePaper Conference and Trade Show, PaperCon 2011
Abbreviated titlePaperCon 2011
CountryUnited States
CityCovington
Period1/05/114/05/11

Fingerprint

dewatering
tensile strength
refiners
pulp
refining
valleys
mechanical properties
drainage
testing

Cite this

Lindqvist, H., Salminen, K., Kataja-Aho, J., Retulainen, E., Fardim, P., & Sundberg, A. (2011). The effect of fines on dewatering, wet and dry web properties. In PaperCon 2011 (pp. 448-455). TAPPI Press.
Lindqvist, H. ; Salminen, Kristian ; Kataja-Aho, Janne ; Retulainen, Elias ; Fardim, P. ; Sundberg, A. / The effect of fines on dewatering, wet and dry web properties. PaperCon 2011. TAPPI Press, 2011. pp. 448-455
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Lindqvist, H, Salminen, K, Kataja-Aho, J, Retulainen, E, Fardim, P & Sundberg, A 2011, The effect of fines on dewatering, wet and dry web properties. in PaperCon 2011. TAPPI Press, pp. 448-455, Paper Conference and Trade Show, PaperCon 2011, Covington, United States, 1/05/11.

The effect of fines on dewatering, wet and dry web properties. / Lindqvist, H.; Salminen, Kristian; Kataja-Aho, Janne; Retulainen, Elias; Fardim, P.; Sundberg, A.

PaperCon 2011. TAPPI Press, 2011. p. 448-455.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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N2 - Speed of paper machines is often limited by the drainage rate of the furnish and the mechanical properties of the wet web, i.e. the tension and relaxation properties. In this study, the effects of the fibre properties and fines content on dewatering, dry and wet web properties were determined. The share of long fibres decreased only slightly when the pulp was refined in the Valley beater. More fibre cutting occurred during refining in the ProLab refiner. Tests showed that refining of pulp from SR20 to SR30 and SR70 using a Valley beater or a ProLab refiner increased the dewatering time. The wet and dry tensile strength as well as the residual tension of the wet web at 2% strain also increased. Removal of fines shortened the dewatering time and decreased the wet and dry tensile strength, and the residual tension compared to pulps containing fines. Addition of fines increased the dewatering time as well as the dry and wet tensile strength. The fibre properties affected the residual tension more than the fines content, while the fines content was more important for the wet tensile strength

AB - Speed of paper machines is often limited by the drainage rate of the furnish and the mechanical properties of the wet web, i.e. the tension and relaxation properties. In this study, the effects of the fibre properties and fines content on dewatering, dry and wet web properties were determined. The share of long fibres decreased only slightly when the pulp was refined in the Valley beater. More fibre cutting occurred during refining in the ProLab refiner. Tests showed that refining of pulp from SR20 to SR30 and SR70 using a Valley beater or a ProLab refiner increased the dewatering time. The wet and dry tensile strength as well as the residual tension of the wet web at 2% strain also increased. Removal of fines shortened the dewatering time and decreased the wet and dry tensile strength, and the residual tension compared to pulps containing fines. Addition of fines increased the dewatering time as well as the dry and wet tensile strength. The fibre properties affected the residual tension more than the fines content, while the fines content was more important for the wet tensile strength

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Lindqvist H, Salminen K, Kataja-Aho J, Retulainen E, Fardim P, Sundberg A. The effect of fines on dewatering, wet and dry web properties. In PaperCon 2011. TAPPI Press. 2011. p. 448-455