Drying tension and shrinkage in paper and board: Part 2 A symmetric three-ply board

Elias Retulainen, Pekka Martikainen, Oleg Timofeev

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The hypothetical shrinkage and internal tension behaviour of a symmetric three-ply board was investigated by utilising results of drying shrinkage and tension in separate individual plies (Part I of this paper) and using a simulated internal dryness profile of such a multiply board during drying on a typical paper machine cylinder dryer train. In paperboard the top plies dry first and tend to shrink first and they also have higher shrinkage potential. During unrestrained drying the middle ply restrains the shrinkage of the top ply and this has an improving effect on the smoothness and tensile stiffness of the top layer. Experimental results and simulated internal dryness distributions show large differences in dryness and drying stress/shrinkage behaviour (between top and middle plies) throughout the drying process. Generally the differences were largest when the average board dryness was 75-80%.
Original languageEnglish
Pages (from-to)55-59
JournalAppita Journal
Volume68
Issue number1
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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Drying
Driers (materials)
Paperboards
Stiffness

Keywords

  • drying
  • paper properties
  • shrinkage
  • tension
  • simulation
  • multiply paperboards

Cite this

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title = "Drying tension and shrinkage in paper and board: Part 2 A symmetric three-ply board",
abstract = "The hypothetical shrinkage and internal tension behaviour of a symmetric three-ply board was investigated by utilising results of drying shrinkage and tension in separate individual plies (Part I of this paper) and using a simulated internal dryness profile of such a multiply board during drying on a typical paper machine cylinder dryer train. In paperboard the top plies dry first and tend to shrink first and they also have higher shrinkage potential. During unrestrained drying the middle ply restrains the shrinkage of the top ply and this has an improving effect on the smoothness and tensile stiffness of the top layer. Experimental results and simulated internal dryness distributions show large differences in dryness and drying stress/shrinkage behaviour (between top and middle plies) throughout the drying process. Generally the differences were largest when the average board dryness was 75-80{\%}.",
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Drying tension and shrinkage in paper and board : Part 2 A symmetric three-ply board. / Retulainen, Elias; Martikainen, Pekka; Timofeev, Oleg.

In: Appita Journal, Vol. 68, No. 1, 2015, p. 55-59.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Drying tension and shrinkage in paper and board

T2 - Part 2 A symmetric three-ply board

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AU - Martikainen, Pekka

AU - Timofeev, Oleg

N1 - Project code: C3SU00304

PY - 2015

Y1 - 2015

N2 - The hypothetical shrinkage and internal tension behaviour of a symmetric three-ply board was investigated by utilising results of drying shrinkage and tension in separate individual plies (Part I of this paper) and using a simulated internal dryness profile of such a multiply board during drying on a typical paper machine cylinder dryer train. In paperboard the top plies dry first and tend to shrink first and they also have higher shrinkage potential. During unrestrained drying the middle ply restrains the shrinkage of the top ply and this has an improving effect on the smoothness and tensile stiffness of the top layer. Experimental results and simulated internal dryness distributions show large differences in dryness and drying stress/shrinkage behaviour (between top and middle plies) throughout the drying process. Generally the differences were largest when the average board dryness was 75-80%.

AB - The hypothetical shrinkage and internal tension behaviour of a symmetric three-ply board was investigated by utilising results of drying shrinkage and tension in separate individual plies (Part I of this paper) and using a simulated internal dryness profile of such a multiply board during drying on a typical paper machine cylinder dryer train. In paperboard the top plies dry first and tend to shrink first and they also have higher shrinkage potential. During unrestrained drying the middle ply restrains the shrinkage of the top ply and this has an improving effect on the smoothness and tensile stiffness of the top layer. Experimental results and simulated internal dryness distributions show large differences in dryness and drying stress/shrinkage behaviour (between top and middle plies) throughout the drying process. Generally the differences were largest when the average board dryness was 75-80%.

KW - drying

KW - paper properties

KW - shrinkage

KW - tension

KW - simulation

KW - multiply paperboards

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JO - Appita Journal

JF - Appita Journal

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