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Flerskiktat papper: en sammanställning av historia, teknik och forskningsresultat
Dalarna University, School of Technology and Business Studies, Graphic/Arts Technology.
2005 (Swedish)Independent thesis Basic level (degree of Bachelor)Student thesis
Abstract [sv]

Until the beginning of the 1900:th century the paper making process was handicraft. The paper machines that have been developed since then are as impressing in size as fascinating when it comes to the technique. The process has always been improved to give a better paper for lower costs, with as short manufacture time as possible. Stratified forming has been a reality since 1830. From the beginning it was applied to board and paperboard. Now it is also the most common method for making tissue and one paper mill in Austria use it for fine paper. Stratified forming can be categorized as separate forming or simultaneous forming. Separate forming means using several headboxes and sometimes even several wires. Simultaneous forming means using only one stratified headbox. This method has many advantages over separate forming, inter alia improved economy, quality, wood exchange and higher runability of the paper machine. Several experiments have been done with simultaneous forming of different fibres by placing a fibre with high bulk in the middle layer and a smooth fibre on the surface layers. The results has shown that by using this method both the bending stiffness and surface properties are improved, or a lower grammage paper is obtained with maintaining quality. Simultaneous forming can also be used to stratify fillers in layers where they are most efficient. In that way both paper quality and economy is improved. Simultaneous forming is also used for fractionated pulp. Fractionation means separating springwood fibre from summerwood fibre, and placing them in separate layers. Research results of fractionated pulp show about the same result as simultaneous forming of different fibres.

Place, publisher, year, edition, pages
Borlänge, 2005. , 52 p.
Keyword [sv]
flerskiktat papper, samformning, separat formning, fraktionering, inloppslåda, AQ-vanes, Airwedge technology, pappersmaskin
Identifiers
URN: urn:nbn:se:du-1536OAI: oai:dalea.du.se:1536DiVA: diva2:517929
Uppsok
Technology
Supervisors
Available from: 2005-11-21 Created: 2005-11-21 Last updated: 2012-04-24Bibliographically approved

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Type fulltextMimetype application/pdf

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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