Experimental evaluation of the interfibre joint strength ofpapermaking fibres in terms of manufacturing parameters and intwo different loading directions
2012 (English)Report (Other academic)
The strength properties of interfibre bonds play a vital role in the response of fibrous materials,such as paper and paperboard, under mechanical loading. To help tailor the properties of suchmaterials by chemical or mechanical treatments of the fibre wall and fibre surfaces, improvedunderstanding of the microscopic damage and failure mechanisms of interfibre joints is desirable.In this paper, a method for manufacturing and testing of interfibre joint specimens in twoprincipally different modes of loading is presented.The method was applied to investigate the strength of Kraft pulp interfibre joints with differentgeometries and in two different modes of loading: the conventional shearing mode and also apeeling mode of loading. The method was also used to investigate the influence of dryingpressure, defined as the nominal pressure between two Teflon surfaces or between a rubbersurface and a Teflon one as well as a simple comparison of a pulp with two different degrees ofrefining.The results are presented in terms of rupture force and using different methods of normalizationsuch as nominal overlap area, length, and width of the joint region, measured using a microscope.It was shown in this study that neither of the methods of normalization unambiguously reducedthe large scatter of the strength measurements. The results of tests done with the peeling type ofloading were about 20 % of those done with the conventional shearing type of loading.
Place, publisher, year, edition, pages
2012. , 31 p.
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 523
interfibre joint strength, interfibre bond, fibre-fibre joint, fibre-fibre cross, paper strength, paper mechanics
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-116694OAI: oai:DiVA.org:kth-116694DiVA: diva2:600375
FunderSwedish Research Council, 2007-5380
QC 201301242013-01-242013-01-242013-01-25Bibliographically approved