Vibration Method for the Prediction of Aging Effect on Properties of Particleboard and Fiberboard

Author

Ignacio Bobadilla Maldonado, Guillermo Iñiguez González, Miguel Esteban Herrero, and Francisco Arriaga Martitegui

The authors are, respectively, Associate Professor, Assistant Professor, Associate Professor, and Professor, Univ. Politécnica de Madrid, Ingeniería Forestal—EUIT Forestal, Madrid, Spain (i.bobadilla@upm.es [corresponding author], Guillermo.iniguez@upm.es, Miguel.esteban@upm.es, Francisco.arriaga@upm.es). This paper was received for publication in December 2011. Article no. 11‐00137.

Article Citation:

Ignacio Bobadilla Maldonado, Guillermo Iñiguez González, Miguel Esteban Herrero, and Francisco Arriaga Martitegui (2012) Vibration Method for the Prediction of Aging Effect on Properties of Particleboard and Fiberboard. Forest Products Journal: 2012, Vol. 62, No. 1, pp. 69-74.

https://doi.org/10.13073/FPJ-D-11-00137.1

Abstract

The physical and mechanical properties (density, modulus of elasticity, and modulus of rupture) of standard and humidity-resistant types of particleboard and fiberboard were determined by standardized test and wave propagation velocity, obtained from the natural frequency in a nondestructive longitudinal vibration test. Four batches of 66 specimens for each type of panel (particleboard and fiberboard) and for each kind of panel (standard and humidity resistant) were tested under initial conditions and after each one of the three aging cycles defined in European Standard EN 321:2001. Each aging cycle consisted of immersion in water, freezing, and high-temperature drying. The decreasing ratio of wave velocity was used to predict the decreasing ratio of properties. There was a strong relationship between both variables, and an exponential regression model is proposed to predict physical and mechanical properties, with a determination coefficient (R²) from 0.93 to 0.98.

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http://www.forestprodjournals.org/doi/abs/10.13073/FPJ-D-11-00137.1

Effects of Moulding Temperature on the Physical Properties of Wood-Based Moulding Bonded with Citric Acid

Author

Kenji Umemura, Tomohide Ueda, and Shuichi Kawai

The authors are, respectively, Associate Professor, Research Inst. for Sustainable Humanosphere, Kyoto Univ., Uji, Kyoto, Japan (umemura@rish.kyoto-u.ac.jp [corresponding author]); Engineer, Eidai Co., Ltd., Tsuruga, Fukui, Japan (tomo_1805@yahoo.co.jp); and Professor, Research Inst. for Sustainable Humanosphere, Kyoto Univ., Uji, Tyoto, Japan (skawai@rish.kyoto-u.ac.jp). This paper was received for publication in October 2011. Article no. 11-00121.

Article Citation:
Kenji Umemura, Tomohide Ueda, and Shuichi Kawai (2012) Effects of Moulding Temperature on the Physical Properties of Wood-Based Moulding Bonded with Citric Acid. Forest Products Journal: 2012, Vol. 62, No. 1, pp. 63-68.

https://doi.org/10.13073/FPJ-D-11-00121.1

Abstract

Development of natural adhesives that do not depend on fossil resources is very important for the future of wood-based materials. We recently found that citric acid can be used as a natural adhesive for wood-based moulding. In this study, we investigated the effects of moulding temperature on the characterization of wood-based moulding bonded with citric acid. Wood powder obtained from Acacia mangium was mixed with 20 percent (by weight) citric acid, and the powder mixture was moulded at a temperature ranging from 140°C to 220°C. The press pressure and heating time were set at 4 MPa and 10 minutes, respectively. The bending properties were affected by the moulding temperature, and the moulding fabricated at 180°C showed excellent values. The average impact strength of the moulding at 180°C was 1.1 kJ/m². Water resistance increased with moulding temperature, and good resistance against boiling water was achieved. Thermal properties were also clearly increased with moulding temperature. However, few significant differences were found in the mouldings after a repeated boiling treatment. Based on the results of Fourier transform infrared spectroscopy, ester linkages between wood and citric acid were confirmed, especially at high moulding temperatures.

Cited by

Kenji Umemura and Shuichi Kawai. (2015) Development of Wood-Based Materials Bonded with Citric Acid. Forest Products Journal65:1-2, 38-42.
Online publication date: 18-Mar-2015.
Abstract | Full Text | PDF (995 KB) 

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http://www.forestprodjournals.org/doi/abs/10.13073/FPJ-D-11-00121.1