- Original Article
- Published:
Effects of press closing time on mat consolidation behavior during hot pressing and on linear expansion of particleboard
Journal of Wood Science volume 48, pages 309–314 (2002)
Abstract
Mat consolidation behavior was investigated at various press closing times (PCTs) using hinoki (Japanese cypress) particle mats. The temperature in the core layer of the mat, press pressure, and platen distance were measured. At the plateau stage during hot pressing, the core temperature decreased with increasing PCT. The core temperature did not increase before the platen distance equaled the target board thickness in the PCT range of 4–50 s and rose slightly when the PCT exceeded 100s. There was a linear relation between the logarithm of PCT and the maximum press pressure. The density profile across board thickness was strongly affected by the PCT. As the PCT increased, the position of the peak density (PD) moved toward the core layer as the PD itself decreased. The effect of PCT on the linear expansion (LE) of the board is discussed in relation to the density profile. There was no difference in LE after high relative humidity treatment in the PCT range 4–50s. LE appeared to be related to the low density and the precured region of the board surface. The LE after drying treatment was around −0.1%, and the thickness swelling after high relative humidity and drying treatments increased with increasing PCT.
References
Suchsland O (1967) Behavior of a particleboard mat during the press cycle. For Prod J 17(2):51–57
Arima T (1968) Studies on rheological behavior of wood particle mat. II (in Japanese). Mokuzai Gakkaishi 14:304–308
Oudjehane A, Lam F, Avramidis S (1998) A continuum model of the interaction between manufacturing variables and consolidation of wood composite mats. Wood Sci Technol 32:381–391
Dai C, Steiner PR (1993) Compression behavior of randomly formed wood flake mats. Wood Fiber Sci 25:349–358
Humphrey PE, Bolton AJ (1989) The hot pressing of dry-formed wood-based composites. Part II. A simulation model for heat and moisture transfer, and typical results. Holtzforschung 43:199–206
Bolton AJ, Humphrey PE, Kavvouras PK (1989) The hot pressing of dry-formed wood-based composites. Part III. Predicted vapour pressure and temperature variation with time, compared with experimental data for laboratory boards. Holtzforschung 43:265–274
Bolton AJ, Humphrey PE, Kavvouras PK (1989) The hot pressing of dry-formed wood-based composites. Part IV. Predicted variation of mattress moisture content with time. Holtzforschung 43:345–349
Humphrey PE, Bolton AJ (1989) The hot pressing of dry-formed wood-based composites. Part V. The effect of board size: comparability of laboratory and industrial pressing. Holtzforschung 43:401–405
Kamke FA, Casey LJ (1988) Fundamentals of flakeboard manufacture: internal-mat conditions. For Prod J 38(6):38–44
Kamke FA, Casey LJ (1988) Gas pressure and temperature in the mat during flakeboard manufacture. For Prod J 38(3):41–43
Wong ED, Zhang M, Wang Q, Kawai S (1998) Effect of mat moisture content and press closing speed on the formation of density profile and properties of particleboard. J Wood Sci 44:287–295
Fukino M, Horie H, Sato T, Ogawa N (2000) Production technology for strand-particle board (SPB). II. Effect of initial pressure during hot pressing on thickness swelling (in Japanese). Mokuzai Gakkaishi 46:581–586
Suzuki S, Miyamoto K (1998) Effect of manufacturing parameters on the linear expansion and density profile of particleboard. J Wood Sci 44:444–450
Sekino N, Suematsu A, Fujimoto Y, Kitani Y, Wang K (2000) Effect of manufacturing parameters on the linear expansion of densified wood composite panels I. Effect of element size and press temperature (in Japanese). Mokuzai Gakkaishi 46:334–341
ASTM D 1037-87 (1987) Standard methods of evaluating the properties of wood-base fiber and particle panel materials, linear variation with change in moisture content
Japanese Industrial Standard (1994) JIS A 5908-1994: particleboards
Sekino N, Irle MA (1996) Particleboard hygroscopicity: its prediction and the influence of hot pressing. Mokuzai Gakkaishi 42:43–50
Kollmann FFP, Cote WA Jr (1968) Principles of wood science and technology, vol I: Solid wood. Springer, Berlin Heidelberg New York, pp 336–338
Fujimoto Y, Morizono S, Inamasu T, Mataki Y (1995) Mechanism of generating linear expansion with adsorption and desorption for particleboards: behavior of interactive restraint between layers. Bull. Kyushu Univ For 73:43–60
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Miyamoto, K., Suzuki, S., Inagaki, T. et al. Effects of press closing time on mat consolidation behavior during hot pressing and on linear expansion of particleboard. J Wood Sci 48, 309–314 (2002). https://doi.org/10.1007/BF00831352
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00831352