Abstract
Any treatment of fibers can influence properties of medium density fibreboard (MDF). In this research, the effects of hydrothermal treatment on physical and mechanical properties of MDF were studied. Industrial fibers were hydrothermally treated in a stainless steel reactor at 120, 150 and 180 °C for 0, 30 and 90 min as holding time. Test boards were made based on 0.7 g/cm3 target density, with 10 mm thickness under a pressure of 30 bar and at a temperature of 170 °C and a press time of 10 min. The boards were tested for internal bonding (IB), moduli of elasticity (MOE) and rupture (MOR), thickness swelling and water absorption.
Results showed that the water absorption was not affected by the hydrothermal treatment; while the thickness swelling was improved and the boards became dimensionally stable. The MOE was slightly reduced due to the hydrothermal treatment. The MOR and the IB were significantly decreased by the hydrothermal treatment.
Zusammenfassung
Die Eigenschaften mitteldichter Faserplatten (MDF) können durch eine Behandlung der Fasern beeinflusst werden. In dieser Studie wird der Einfluss einer hydrothermischen Behandlung auf die physikalischen und mechanischen Eigenschaften von MDF untersucht. Industriell hergestellte Fasern wurden in einem Edelstahlbehälter bei 120, 150 und 180 °C jeweils 0, 30 und 90 Minuten lang hydrothermisch behandelt. 10 mm dicke Versuchsplatten mit einer Solldichte von 0.7 g/cm3 wurden bei einem Druck von 30 bar, einer Temperatur von 170 °C und einer Presszeit von 10 min hergestellt. Die Querzugfestigkeit (IB), der E-Modul und die Biegefestigkeit sowie die Dickenquellung und die Wasseraufnahme der Platten wurden geprüft.
Die Ergebnisse zeigten, dass die hydrothermische Behandlung keinen Einfluss auf die Wasseraufnahme hatte. Die Dickenquellung wurde verbessert und die Platten wurden formstabiler. Durch die Behandlung nahm der E-Modul leicht ab und die Biegefestigkeit sowie die Querzugfestigkeit verringerten sich signifikant.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Bengtsson C, Jermer J, Brem F (2002) Bending strength of heat-treated spruce and pine timber, The International Research Group on Wood Preservation, IRG Document No. IRG/WP 02-40242
Boonstra MJ, Tjeerdsma BF (2006) Chemical analysis of heat treated softwoods. Holz Roh- Werkst 64:204–211
Boonstra MJ, Pizzi A, Zomers F, Ohlmeyer M, Paul W (2006) The effect of a two stage heat treatment process on the properties of particleboard. Holz Roh- Werkst 64(2):157–164
European Committee for Standardization (CEN), EN 310 (1993) Wood based panels – Determination of modulus of elasticity in bending strength
European Committee for Standardization (CEN), EN 317 (1993) Particleboards and fiberboards – Determination of swelling in thickness after immersion in water
European Committee for Standardization (CEN), EN 319 (1993) Particleboards and Fiberboards – Determination of tensile strength perpendicular to the plane of the board
Frihart CR (2005) Wood adhesion and adhesives. In: Rowell RM (ed) Handbook and wood chemistry and composites. CRC Press, London, pp 215–278
Garrote G, Dominiguez H, Parajó JC (1999) Hydrothermal processing of lignocellulosic materials. Holz Roh- Werkst 57:191–202
Garrote G, Dominiguez H, Parajó JC (2001) Study on the deactylation of hemicelluloses during the hydrothermal processing of Eucalyptus wood. Holz Roh- Werkst 59:53–59
Hakkou M, Pétrissans M, Zoulalian A, Gérardin P (2005) Investigation of wood wettability changes during heat treatment on the basis of chemical analysis. Polym Degrad Stabil 89:1–5
Militz H (2000) Heat Treatment Technologies in Europe: Scientific Background and Technological State-of-Art, Conference on Enhancing the Durability of Lumber and Engineered Wood Products, February 11–13, Kissimmee, Orlando, Forest Products Society, Madison, USA
Mohebby B, Sanaei I (2005) Influences of the hydro-thermal treatment on physical properties of beech wood (Fagus orientalis), The International Research Group on Wood Preservation, IRG Document No. IRG/WP 05-40303
Ohlmeyer M, Lukowsky D (2004) Wood-based panels produced from thermal-treated materials: Properties and perspectives, Conference on Wood Frame Housing Durability and Disaster Issue, 4–6th Oct., Las Vegas, USA, pp 127–131
Paul W, Ohlmeyer M, Leithoff H, Boonstra MJ, Pizzi A (2006) Opimising the properties of OSB by a one-step heat pre-treatment process. Holz Roh- Werkst 64(3):227–234
Rapp AO, Sailer M (2001) Oil-heat treatment of wood: Process and properties, COST action 22
Pizzi A (1994) Advanced wood adhesives technology. Marcel Dekker Inc, New York
Sundqvist B, Kalrsson O, Westrmark U (2006) Determination of formic-acid and acetic acid concentrations formed during hydrothermal treatment of birch wood and its relation to colour, strength and hardness. Wood Sci Technol 40:549–561
Syränen T, Jämsä S, Viitaniemi P (2000) Heat treatment of wood in Finland – State of the art. In: Proceedings of the Träskydd-, värmebehandlat trä-, egenskaper och användningsormråden, 21st Nov., Stockholm, Sweden
Tjeerdsma BF, Stevens M, Militz H (2000) Durability aspects of hydrothermaly treated wood. The International Research Group on Wood Preservation, IRG Document No. IRG/WP 00-40160
Tjeerdsma BF, Militz H (2005) Chemical changes in hydrothermal treated wood: FTIR analysis of combined hydrothermal and dry heat-treated wood. Holz Roh- Werkst 63:102–111
Vernois M (2000) Heat treatment of wood in France – State of the art: In: Proceedings of the Träskydd-, värmebehandlat trä-, egenskaper och användningsormråden, 21st Nov., Stockholm, Sweden
Vick CB, Rowell RM (1990) Adhesive bonding of acetylated wood. Int J Adhes Adhes 10(4):263–272
Wallenberger FT, Weston N (2004) Natural fibers, Plastic and Composites. Kluwer Academic Publisher, Massachusetts, p 392
Winandy JE, Rowell RM (2005) Chemistry of wood strength. In: Rowell RM (ed) Handbook of wood chemistry and wood composites. CRC Press, London, pp 303–347
Yildiz S, Çolakoğlu G, Yildiz ÜC, Gezer DE, Temiz A (2002) Effects of heat treatment on modulus of elasticity of beech wood. The International Research Group on Wood Preservation, IRG Document No. IRG/WP 02-40222
Yildiz S, Gümüşkaya E (2006) The effects of thermal modification on crystalline structure of cellulose in soft and hardwood. Build Environ 42:62–67
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Mohebby, B., Ilbeighi, F. & Kazemi-Najafi, S. Influence of hydrothermal modification of fibers on some physical and mechanical properties of medium density fiberboard (MDF) . Holz Roh Werkst 66, 213–218 (2008). https://doi.org/10.1007/s00107-008-0231-y
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00107-008-0231-y