NDLI: Gas pressure measurements during continuous hot pressing of particleboard

Content Provider	Springer Nature Link
Author	Meyer, Niels Thoemen, Heiko
Copyright Year	2006
Abstract	Knowledge about the development of the internal gas pressure during hot pressing of wood-based composites is important for the optimization of panel properties and production speed. The gas pressure heavily affects the thermodynamic conditions inside the wood furnish mat, and a too high maximum value at press opening might cause an impairment of the panel properties. In this paper, gas pressure and temperature measurements inside a particle mat while passing through a continuous hot press are presented for the first time. The measurements were performed with a transportable system, consisting of a steel tube attached to a miniature pressure transducer and a data logger. The particleboards had a target thickness of mainly 16 mm, but also of 28 mm and 38 mm, respectively. The measurements show a distinct horizontal gas pressure distribution in both directions, in production direction and across the mat’s width. In contrast, cross-sectional gas pressure gradients were only visible inside the panels after leaving the press. By comparing the gas pressure curves measured for particleboard with those for medium density fiberboard (MDF), characteristic differences became evident. Overall, the gas pressure is higher in MDF compared to particleboard. Finally, a comparison between the gas pressure levels measured for three different panel thicknesses showed a clear relation between panel thickness and gas pressure, with a decreasing panel thickness resulting in an increase in gas pressure. The results of this paper will contribute to our understanding about the events inside wood furnish mats during continuous hot pressing. Kenntnisse über die Entwicklung des Gasinnendrucks beim Verpressen von Holzwerkstoffen sind von großer Bedeutung für die Optimierung von Platteneigenschaften und Produktionsgeschwindigkeit. Der Gasdruck bestimmt in starkem Maße die thermodynamischen Bedingungen im Inneren der Matte, und ein zu hoher Gasdruck am Pressenende kann die Platteneigenschaften negativ beeinflussen. In diesem Artikel werden erstmalig Gasdruck- und Temperaturmessungen innerhalb von Spanmatten beim Verpressen in einer kontinuierlich arbeitenden Heißpresse präsentiert. Die Aufzeichnungen sind mit einem mobilen Messsystem durchgeführt worden, welches aus einer Stahlkanüle besteht, die an einen Miniaturdruckaufnehmer und einen Datenlogger angeschlossen ist. Die Spanplatten hatten eine Zieldicke von hauptsächlich 16 mm, ergänzt um Platten mit 28 bzw. 38 mm Zieldicke. Die Messungen zeigen eine deutliche horizontale Gasdruckverteilung sowohl in Produktionsrichtung als auch über die Mattenbreite. Im Gegensatz dazu waren Gasdruckgradienten über den Mattenquerschnitt nur unmittelbar hinter der Presse erkennbar. Beim Vergleich von Gasdruckkurven für Spanplatten und MDF konnten charakteristische Unterschiede nachgewiesen werden. Insgesamt fällt der Gasdruck für MDF höher aus als für Spanplatten. Ein abschließender Vergleich zwischen den Gasdruckniveaus, welche für drei unterschiedliche Plattenstärken ermittelt wurden, ergab einen deutlichen Zusammenhang zwischen Plattendicke und Gasdruck; abnehmende Plattendicken führen zu einem Anstieg des Gasdruckniveaus. Die in diesem Artikel präsentierten Ergebnisse stellen einen Beitrag zum besseren Verständnis der Vorgänge beim kontinuierlichen Heißpressen von Holzwerkstoffmatten dar.
Starting Page	49
Ending Page	55
Page Count	7
File Format	PDF
ISSN	00183768
Journal	Holz als Roh- und Werkstoff
Volume Number	65
Issue Number	1
e-ISSN	1436736X
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-08-26
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Operating Procedures, Materials Treatment Ceramics, Glass, Composites, Natural Methods Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Materials Science Forestry

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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