?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%2F380%2F&rft.title=The+J-Box+Problem&rft.creator=Please%2C+C.P.&rft.creator=Jones%2C+M.&rft.creator=Allwright%2C+D.J.&rft.subject=Materials&rft.description=The+study+group+was+presented+with+the+problem+of+determining+the+behaviour+of+a+web+of+wet+cellulose+fibres+-+called+a+tow+-+as+it+passes+through+part+of+the+manufacturing+process.+The+name+of+the+problem+derives+from+the+fact+that+on+its+passage+down+the+production+line+the+tow+passes+through+a+J-shaped+box%2C+whose+purpose+is+to+provide+a+buffer+where+the+tow+is+stored+long+enough+and+hot+enough+for+certain+chemical+reactions+to+take+place%2C+mainly+concerned+with+giving+the+right+quality+to+the+fibre+surface.+(The+production+line+in+fact+involves+two+J-boxes%2C+one+containing+wet+tow%2C+the+other+dry%2C+and+we+are+here+entirely+concerned+with+the+first+of+these%2C+the+wet+J-box.)+%0D%0A%0D%0AThree+aspects+of+the+tow+behaviour+were+proposed+for+investigation%3A%0D%0A1.+What+is+the+mechanical+behaviour+of+the+tow+within+the+J-box+%3F+Specifically%2C+how+do+the+time+spent+within+the+J-box+and+the+shape+of+the+tow+outlet+column+depend+on+the+J-+box+geometry%2C+tow+density+and+compressibility%2C+flow+rate%2C+friction+coefficients+etc.%0D%0A2.+What+is+the+temperature+history%2C+and+hence+the+chemical+history%2C+of+the+tow+within+the+J-box%3F%0D%0A3.+Why+do+dislocations+and+loops+occur+within+the+tow%3F%0D%0A%0D%0AWe+first+give+typical+parameters+and+other+details+of+the+process%2C+and+then+further+details+of+these+three+questions.&rft.date=2000&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%2F380%2F1%2FThe-J-box-problem.pdf&rft.identifier=++Please%2C+C.P.+and+Jones%2C+M.+and+Allwright%2C+D.J.++(2000)+The+J-Box+Problem.++%5BStudy+Group+Report%5D+++++