Original scientific paper

https://doi.org/10.5552/drind.2016.1547

Physical Properties of Boards Manufactured with Hygrothermally Treated Tepa (Laureliopsis Philippiana Looser) Particles

Rommel Crespo Gutiérrez ; School of Forest Engineering, Faculty of Environmental Sciences, State Technical University of Quevedo, Quevedo- Ecuador
Luis Valenzuela ; Department of Forest Management and Environment, Faculty of Forestry, University of Concepción, Concepción, Chile
Hernán Wilson Poblete ; Forest Products Laboratory, Faculty of Forestry and Natural Resources Sciences, Austral University of Chile, Valdivia-Chile

Abstract

Three layer particleboards were manufactured using hygrothermally treated and untreated Laureliopsis philippiana (tepa) particles with urea-formaldehyde (UF) resin. Hygrothermal treatment consisted of autoclaving particles at 150 °C for 90 min (430 kPa) in a steam saturated atmosphere. Density, moisture content, swelling and water absorption were determined. Equilibrium moisture, dimensional variation in length and thickness, as well as length and thickness coefficients per every 1 % change in board equilibrium moisture were also determined after acclimatization at different relative air humidity conditions (20 °C; 40, 50, 60, 70, 80 and 90 % RAH). There were significant differences between particleboards made from control and treated particles. Boards manufactured with treated particles showed a reduction in moisture content, swelling and water absorption. Dimensional stability analysis in response to relative air humidity (RAH) showed that the hygrothermal treatment causes a reduction in equilibrium moisture, a decrease in length and thickness dimensional variation, likewise a reduction in length and thickness swelling coefficients.

Keywords

Particleboard; hygrothermal treatment; Laureliopsis philippiana; physical properties; dimensional stability

Hrčak ID:

166912

URI

https://hrcak.srce.hr/166912

Publication date:

30.9.2016.

Article data in other languages: croatian

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