?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%2F609%2F&rft.title=Foam+formation+in+the+plastics+industry&rft.creator=Bradley%2C+A.&rft.creator=Cooker%2C+M.J.&rft.creator=Dellar%2C+P.J.&rft.creator=Fitt%2C+A.D.&rft.creator=Fowler%2C+A.C.&rft.creator=Keener%2C+J.P.&rft.creator=King%2C+J.R.&rft.creator=Lacey%2C+A.A.&rft.creator=Lee%2C+W.T.&rft.creator=Mitchell%2C+S.L.&rft.creator=Richardson%2C+G.&rft.creator=Vynnycky%2C+M.&rft.subject=Materials&rft.subject=Fluids&rft.description=The+manufacture+of+polyvinyl+(PVC)+fascia+boards+involves+the+extrusion+of+a+pressurized+mixture+of+molten+PVC+and+foaming+agents+through+a+die+that+is+shaped+in+the+exterior+of+a+board%3B+subsequent+pressure+release+triggers+foaming%2C+so+that+the+interior+of+the+board+is+filled%2C+simultaneously+as+the+board+is+cooled.+Sometimes%2C+however%2C+the+foam+does+not+fill+the+interior%2C+leading+to+undesired+voids%2C+especially+at+corners.+We+consider+a+mathematical+model+for+the+foaming+process+that+attempts+to+account+for+the+formation+of+undesired+voids.+Preliminary+model+results+suggest+that+severe+temperature+gradients+through+the+cross-section+are+most+likely+responsible+for+void+formation%3B+two+mechanisms+are+suggested.&rft.date=2011&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%2F609%2F1%2FCorkPlastics.pdf&rft.identifier=++Bradley%2C+A.+and+Cooker%2C+M.J.+and+Dellar%2C+P.J.+and+Fitt%2C+A.D.+and+Fowler%2C+A.C.+and+Keener%2C+J.P.+and+King%2C+J.R.+and+Lacey%2C+A.A.+and+Lee%2C+W.T.+and+Mitchell%2C+S.L.+and+Richardson%2C+G.+and+Vynnycky%2C+M.++(2011)+Foam+formation+in+the+plastics+industry.++%5BStudy+Group+Report%5D+++++