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Optimization of tear strength in a multi-ply paperboard
Karlstad University.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The thesis has been carried out as a part of the Master of Science in mechanical engineering at Karlstads University. The purpose of the study was to evaluate how different variables affect the tearing resistance in a multi-ply paperboard. The paperboard’s final quality is dependent on several different process – and recipe variables and has, in this study, been analyzed with respect to ply grammage, ply composition and refining energies. This was investigated by manufacturing of anisotropic sheets consisting of four plies and isotropic sheets consisting of single-ply sheets. The multi-ply sheets were manufactured where one variable at a time were tested at different values. The single-ply sheets were manufactured of pure pulps with the refining energy being varied. A total of nineteen unique multi-ply sheets and twelve unique single-ply sheets were manufactured.

All sheets were tested with respect to the properties including tensile strength, bending stiffness, tear strength and delamination strength. The study shows that an improvement in tearing resistance is obtained when the amount of CTMP-pulp in the center plies 2 and 3 decreases simultaneously as the amount of broke-pulp and unbleached chemical pulp in the same plies increases. The consequence of this improvement is reduced thickness and thereby reduced bending stiffness. The study also shows that several pulps has an optimal degree of refining for maximizing tear strength in paperboard.

The major source of error is believed to be the method of manufacturing. It is also possible that the amount of test points has been too few to be able to see any clear trends for several variables.

Place, publisher, year, edition, pages
2017.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-62638OAI: oai:DiVA.org:kau-62638DiVA, id: diva2:1131189
External cooperation
Stora Enso
Educational program
Engineering: Mechanical Engineering, spec. in Materials Engineering (300 ECTS credits)
Presentation
2017-06-09, 12:00 (Swedish)
Supervisors
Examiners
Available from: 2017-08-25 Created: 2017-08-13 Last updated: 2017-08-25Bibliographically approved

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Karlstad University
Mechanical Engineering

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CiteExportLink to record
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Citation style
  • apa
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