Development of an air-injection press for preventing blowout of particleboard II: improvement of board properties using small-diameter holes for air injection

An air-injection press, which has holes punched in the heating plates, injects high-pressure air through the holes of one plate into boards during press heating. The air-injection press can manufacture boards from high-moisture-content particles by controlling blowouts of the boards. In this study,...

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Bibliographic Details
Published in:Journal of wood science 2011-12, Vol.57 (6), p.507-511
Main Authors: Korai, Hideaki, Ling, Nan
Format: Article
Language:English
Subjects:
Air injection
Biomedical and Life Sciences
Blowouts
Boards
Bond strength
Bonding strength
Characterization and Evaluation of Materials
Heating
Life Sciences
Materials Science
Moisture content
Original Article
Particle board
Properties (attributes)
Water vapor
Wood Science & Technology
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Summary:An air-injection press, which has holes punched in the heating plates, injects high-pressure air through the holes of one plate into boards during press heating. The air-injection press can manufacture boards from high-moisture-content particles by controlling blowouts of the boards. In this study, boards were manufactured from particles that had a moisture content of 25% by using the air-injection press, which reduced the required pressing time. Boards manufactured by injecting air through holes of 5 mm in diameter were of poor quality with a low internal bond strength of only 0.31 MPa. When the hole diameter was reduced to 1 mm, the internal bond strength increased to 0.44 MPa. A high air-injection pressure of 0.55 MPa also resulted in improved board properties over those for boards manufactured at lower pressures. This was probably because a large amount of binder was released from boards through the 5-mm holes, together with water vapor, during air injection; the small-diameter holes reduced the release of binder, resulting in better board properties.
ISSN:1435-0211
1611-4663
DOI:10.1007/s10086-011-1210-1