A new experimental apparatus for high intensity through drying of paper was constructed and commissioned. The principal direct measurements with this facility are the air flow rate, and on-line measurements from beginning to end of the drying of the air temperature and pressure above and below the sheet, the sheet surface temperature on the flow inlet side and the local moisture content of a 2.5 mm diameter spot of the sheet. The equipment, constructed for the use of either air or superheated steam as the drying fluid, was commissioned with air as the drying medium. This facility was tested using three levels of drying air temperature, 90$ sp circ$, 200$ sp circ$, and 300$ sp circ$C, for through-flow rates up to those for which pressure drop across the sheet did not exceed 40 kPa. Papers from kraft, TMP and blended furnishes of grammage between 44 and 100 g/m$ sp2$, were dried from a range of initial moisture contents. / Sheet moisture content was measured on-line with a custom made, 3-wavelength transmission-type infra-red moisture sensor with optical fibre leads permitting installation inside the dryer. / For the kraft and TMP papers for which satisfactory moisture sensor calibrations were obtained, the moisture content-time drying history curves were processed to yield drying rate curves with the instantaneous drying rate as a function of local sheet moisture content. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.23755 |
| Date | January 1995 |
| Creators | Sanguinetti, David |
| Contributors | Douglas, W. S. M. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Chemical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001485395, proquestno: MM12139, Theses scanned by UMI/ProQuest. |
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