Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
The influence of drying temperature on stiffness and drying load in restrained drying of paperboard
2003 (English)Independent thesis Advanced level (degree of Master (One Year))Student thesis
Abstract [en]

A common quality problem in papermaking is “curl” which is defined as the out-of-plane deviation relative to the flat shape. To improve curl control, more knowledge is needed about the mechanisms behind it. The magnitude of curl can be influenced in the dryer section of paper machines. For example, in one-sided drying the side closer to the heated cylinder is exposed to a higher temperature than the opposite side. This influences the rate of drying and also the elastic modulus and drying- induced loads. These parameters influence the magnitude of curl. The purpose of this work is to characterize the effect of changing the drying temperature and time on both the tensile stiffness and the drying load for restraint drying of single-ply paperboard. The results indicate that two competing parameters control the value of the drying load. These are the relaxation rate (which is a function of temperature) and the change in moisture ratio. The tensile stiffness at restraint drying shows exponential increase with the reduction of moisture ratio. A combination of drying temperatures affects the drying-induced load. The magnitude of the tensile stiffness, after restraint drying, appeared to be unaffected by the drying history at approximately the same moisture ratio. The results will serve for further work on the modeling of immediate curl of paper upon the removal of the restraining forces and moments.

Place, publisher, year, edition, pages
2003. , p. 22
Identifiers
URN: urn:nbn:se:kau:diva-57211Local ID: MTK D-2OAI: oai:DiVA.org:kau-57211DiVA, id: diva2:1121814
Subject / course
Mechanical Engineering
Available from: 2017-07-12 Created: 2017-07-12

Open Access in DiVA

No full text in DiVA

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf