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In-Situ Measurements of Stock Flow Conditions in the Twin-Wire Forming Zone
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
RISE - Research Institutes of Sweden, Bioeconomy.
KTH Royal Institute of Technology, Sweden.
2018 (English)In: PaperCon 2018: Shaing the future through innovation, TAPPI , 2018, p. 59-72, article id FF5.1Conference paper, Published paper (Refereed)
Abstract [en]

In the present study, we report results from in-situ investigations of the forming process performed in the roll-bladesection of a pilot machine. Direct measurements of the drainage pressure along the forming zone were obtained usinga miniature fibre-optic pressure transducer inserted into the flow through the headbox jet. High-speed imaging oftracer particles using a transmitted light setup was performed to in an attempt to obtain direct measurements of thelocal stock speed. By replacing one section of a ceramic blade with a quartz glass piece, access was also obtained tothe region on top of the blade. The combined picture that emerges from these measurements is that the pressuredistribution and the velocity field along a twin-wire forming zone is significantly more complex than usuallyassumed, and that much remains to be understood about the dynamics of twin-wire forming.

Place, publisher, year, edition, pages
TAPPI , 2018. p. 59-72, article id FF5.1
Keywords [en]
paper making, forming, roll-blade, measurement, pressure, flow, headbox, twin-wire forming
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-35396Scopus ID: 2-s2.0-85060372651ISBN: 978-1-59510-268-3 (print)OAI: oai:DiVA.org:ri-35396DiVA, id: diva2:1256149
Conference
PaperCon 2018, April 15-18, 2018, Charlotte, NC, USA
Available from: 2018-10-16 Created: 2018-10-16 Last updated: 2019-08-12Bibliographically approved

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