Influence of straining during wet pressing and drying on strength properties of paper

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

During multi-cylinder drying on a paper machine, the paper web is under tension in the machine direction, but restraint in the cross direction is not controlled. The objective of this study was to determine the effects of multi-stage straining during wet pressing and drying on the tensile properties of dried paper. Oriented SC paper samples were prepared on a pilot paper machine with varying levels of draw between the press rolls and subsequently dried in a laboratory tensile tester and strained at three stages during drying. The results showed that increased straining generally led, almost linearly, to decreased strain at break of the dried paper. Tensile stiffness was increased considerably (i.e. 15-20%) by straining at the press section and during drying. The web solids content during the draws significantly influenced the development of tensile stiffness. The efficiency factor, previously used to describe changes in inter- and intra-fiber effects on the shape of the tension-strain curve, was found to correlate with the draw history and strain at break of dried paper. Although a certain level of draw is needed to ensure wet web runnability, straining has a detrimental effect on a number of dry paper web properties. Straining strategy improvements can be made by controlling the solids content at the straining phases.
Original languageEnglish
Pages (from-to)453-461
Number of pages8
JournalNordic Pulp and Paper Research Journal
Volume29
Issue number3
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

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pressing
Drying
drying
stiffness
dietary fiber
Stiffness
Fibers
Tensile properties
history
effect
sampling
Direction compound
fibre
press

Keywords

  • drying
  • efficiency factor
  • tensile properties
  • wet pressing
  • wet straining
  • ANOVA

Cite this

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title = "Influence of straining during wet pressing and drying on strength properties of paper",
abstract = "During multi-cylinder drying on a paper machine, the paper web is under tension in the machine direction, but restraint in the cross direction is not controlled. The objective of this study was to determine the effects of multi-stage straining during wet pressing and drying on the tensile properties of dried paper. Oriented SC paper samples were prepared on a pilot paper machine with varying levels of draw between the press rolls and subsequently dried in a laboratory tensile tester and strained at three stages during drying. The results showed that increased straining generally led, almost linearly, to decreased strain at break of the dried paper. Tensile stiffness was increased considerably (i.e. 15-20{\%}) by straining at the press section and during drying. The web solids content during the draws significantly influenced the development of tensile stiffness. The efficiency factor, previously used to describe changes in inter- and intra-fiber effects on the shape of the tension-strain curve, was found to correlate with the draw history and strain at break of dried paper. Although a certain level of draw is needed to ensure wet web runnability, straining has a detrimental effect on a number of dry paper web properties. Straining strategy improvements can be made by controlling the solids content at the straining phases.",
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Influence of straining during wet pressing and drying on strength properties of paper. / Kouko, Jarmo; Kekko, P.; Retulainen, Elias.

In: Nordic Pulp and Paper Research Journal, Vol. 29, No. 3, 2014, p. 453-461.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Kouko, Jarmo

AU - Kekko, P.

AU - Retulainen, Elias

PY - 2014

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N2 - During multi-cylinder drying on a paper machine, the paper web is under tension in the machine direction, but restraint in the cross direction is not controlled. The objective of this study was to determine the effects of multi-stage straining during wet pressing and drying on the tensile properties of dried paper. Oriented SC paper samples were prepared on a pilot paper machine with varying levels of draw between the press rolls and subsequently dried in a laboratory tensile tester and strained at three stages during drying. The results showed that increased straining generally led, almost linearly, to decreased strain at break of the dried paper. Tensile stiffness was increased considerably (i.e. 15-20%) by straining at the press section and during drying. The web solids content during the draws significantly influenced the development of tensile stiffness. The efficiency factor, previously used to describe changes in inter- and intra-fiber effects on the shape of the tension-strain curve, was found to correlate with the draw history and strain at break of dried paper. Although a certain level of draw is needed to ensure wet web runnability, straining has a detrimental effect on a number of dry paper web properties. Straining strategy improvements can be made by controlling the solids content at the straining phases.

AB - During multi-cylinder drying on a paper machine, the paper web is under tension in the machine direction, but restraint in the cross direction is not controlled. The objective of this study was to determine the effects of multi-stage straining during wet pressing and drying on the tensile properties of dried paper. Oriented SC paper samples were prepared on a pilot paper machine with varying levels of draw between the press rolls and subsequently dried in a laboratory tensile tester and strained at three stages during drying. The results showed that increased straining generally led, almost linearly, to decreased strain at break of the dried paper. Tensile stiffness was increased considerably (i.e. 15-20%) by straining at the press section and during drying. The web solids content during the draws significantly influenced the development of tensile stiffness. The efficiency factor, previously used to describe changes in inter- and intra-fiber effects on the shape of the tension-strain curve, was found to correlate with the draw history and strain at break of dried paper. Although a certain level of draw is needed to ensure wet web runnability, straining has a detrimental effect on a number of dry paper web properties. Straining strategy improvements can be made by controlling the solids content at the straining phases.

KW - drying

KW - efficiency factor

KW - tensile properties

KW - wet pressing

KW - wet straining

KW - ANOVA

U2 - 10.3183/NPPRJ-2014-29-03-p453-461

DO - 10.3183/NPPRJ-2014-29-03-p453-461

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