A laboratory sheet former using the twin-wire concept has been designed and constructed. It is capable of simulating a wide range of industrial papermaking conditions and can generate a pressure profile very close to that of an industrial machine. The machine has three components: the headbox section, the drainage section and the sheet pick-up section. All three sections are activated and brought up to operating speeds independently, with the headbox flow being diverted back into a reservoir. Once all systems are running at their operating conditions, the headbox flow is diverted to form a jet and steady-state sheet forming occurs for a certain period. The sheet and seven white water streams are collected during operation. / The system is currently able to simulate the papermaking process up to the beginning of the vacuum drainage section; the sheet which it creates has a consistency in the vicinity of 11%. Mass balances of better than 95% have been achieved for both water and fibre. The magnitude of the pressure profiles generated has been measured or calculated. Continuing work will bring the sheet consistency into the 15% to 20% range; once this is attained, an efficient tool to optimize wet-end chemistry will be available.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.21299 |
| Date | January 1998 |
| Creators | Hammock, Christopher J. |
| Contributors | Garnier, Gil (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: 001658017, proquestno: MQ50617, Theses scanned by UMI/ProQuest. |
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