?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F469%2F&rft.title=Modelling+dispersion+effects+in+paper-effective+thickness+estimates&rft.creator=Rose%2C+F.&rft.subject=Materials&rft.description=The+structural+properties+of+paper+and+cardboard+are+important+for+the+design+of+containers+and+of+packaging.+Amcor%2C+a+Melbourne-based+producer+of+packaging%2C+pulp+and+paper+products%2C+proposed+the+initial+problem+of+explaining+the+large+discrepancies+which+were+sometimes+observed+between+the+nominal+thickness%2C+as+determined+by+hard+platen+measurements%2C+and+the+effective+thickness+which+would+account+for+the+experimentally+measured+values+of+bending+stiffness.+The+question+was+also+raised+as+to+whether+or+not+ultrasonic+waves+could+be+used+to+measure+directly%2C+and+on-line%2C+the+effective+thickness.%0D%0A%0D%0APaper+can+be+regarded+as+a+fibre-composite+material%2C+with+a+pronounced+anisotropy+due+to+the+preferential+alignment+of+fibres+in+the+machine+direction+as+a+consequence+of+the+manufacturing+process.+The+salient+features+of+elastic+(ultrasonic)+wave+propagation+in+an+anisotropic+plate+will+be+presented%2C+with+an+emphasis+on+addressing+the+questions+raised+above.+In+particular%2C+it+will+be+noted+that+the+characterization+of+the+first+anti-symmetric+(flexural)+mode+should+provide+a+convenient+on-line+measurement+of+the+flexural+stiffness%2C+which+is+the+more+relevant+property+for+quality+control+and+structural+design+than+the+effective+thickness.&rft.date=1994&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F469%2F1%2FModelling-dispersion-effects-in-paper.pdf&rft.identifier=++Rose%2C+F.++(1994)+Modelling+dispersion+effects+in+paper-effective+thickness+estimates.++%5BStudy+Group+Report%5D+++++