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Flow mechanism in twin-wire blade forming. Part II
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
2006 (engelsk)Inngår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 21, nr 1, s. 67-72Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In a one-sided twin-wire model gap former, the KTH-former, the behaviour of pulp fibre floes in the presence of blade forming pressure pulses has been studied at different blade loads and wire permeabilities. Pulp fibre floes were injected into the headbox and recorded with a high speed video camera when passing a forming blade ill the forming zone. With a visual evaluation method the fibre floes were found to be elongated and some of them ruptured during the acceleration when the floes passed the forming blade. Floc strain and floc breaking ratio increased with blade load because of a higher acceleration. Floes partially pinned to the permeable wire will elongate and tend to rupture more due to the mix-to-wire speed difference upstream of the forming blade. Sonic differences for rupture using different pulp qualities are quantified.

sted, utgiver, år, opplag, sider
2006. Vol. 21, nr 1, s. 67-72
Emneord [en]
twin-wire forming, blade forming, fibre floes, floc deformation, experimental studies
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-37388ISI: 000236358800011Scopus ID: 2-s2.0-33645668316OAI: oai:DiVA.org:kth-37388DiVA, id: diva2:433606
Tilgjengelig fra: 2011-08-10 Laget: 2011-08-10 Sist oppdatert: 2017-12-08bibliografisk kontrollert

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