Evaluation of Compression Testing and Compression Failure Modes of Paperboard: Video analysis of paperboard during short-span compression and the suitability of short- and long-span compression testing of paperboard
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Utvärdering av kompressionsbrottmoder och kompressionstestning för kartong : Videoanalys av kartong under kompressionstestning och lämpligheten av två olika kompressionsmetoder (Swedish)
The objectives of the thesis were to find the mechanisms that govern compression failures in paperboard and to find the link between manufacturing process and paperboard properties. The thesis also investigates two different test methods and evaluates how suitable they are for paperboard grades. The materials are several commercial board grades and a set of hand-formed dynamic sheets that are made to mimic the construction of commercial paperboard. The method consists of mounting a stereomicroscope on a short-span compression tester and recording the compression failure on video, long-span compression testing and standard properties testing. The observed failure modes of paperboard under compression were classified into four categories depending on the appearance of the failures. Initiation of failure takes place where the structure is weakest and fiber buckling happens after the initiation, which consists of breaking of fiber-fiber bonds or fiber wall delamination. The compression strength is correlated to density and operations and raw materials that increase the density also increases the compression strength. Short-span compression and Long-span compression are not suitable for testing all kinds of papers; the clamps in short-span give bulky specimens an initial geometrical shape that can affect the given value of compression strength. Long-span compression is only suitable for a limited range of papers, one problem with too thin papers are low wavelength buckling.
Place, publisher, year, edition, pages
2013. , 56 p.
Compression, Failure mode, Short-span compression test, SCT, Long-span compression test, LCT, Compression strength, paperboard
Other Chemical Engineering
IdentifiersURN: urn:nbn:se:kau:diva-27519Local ID: KT:1OAI: oai:DiVA.org:kau-27519DiVA: diva2:625052
Stora Enso Research Center Karlstad
Subject / course
Chemical Engineering, Master of Science
Barbier, ChristopheNiklasson, Göran