A method for preparing extensible paper on the laboratory scale

Jussi Lahti*, Franz Schmied, Wolfgang Bauer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Extensibilityisan important propertyfor papers undergoing large deformations in converting or end use application (e.g. industrial bags). Industrially, high extensibility iscreated by compactingthe moist paper webin machine direction (MD) using anextensible unitsuchas the Clupak or Expanda methods.In this study, amethod was developed to produceextensible paperon thelaboratoryscale. The Clupakunit was simulated using a purpose-builtMDcompactionapparatus. Apaper sheetis placedbetween two stretched rubbers which arerecoiledunder perpendicular pressure to createsufficientfriction between paper and rubber.The laboratory methodfor producing extensible papersufficiently corresponds tothe industrial process, i.e. strain increased while tensile stiffness index and tensile indexdecreased.Increased solids content during rubber recoilingenhancedthe sigmoidal shape of thespecific stress versus strain curves whereas tensile index remained unchanged. Thereproducibility of the methodisat agood leveland thusthe developed method offers a feasible way to study the production of extensible paper on thelaboratoryscale
Original languageEnglish
Pages (from-to)317-321
JournalNordic Pulp & Paper Research Journal
Issue number2
Publication statusPublished - 2014

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Experimental
  • Application


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