Drvna industrija, Vol. 67 No. 3, 2016.
Izvorni znanstveni članak
https://doi.org/10.5552/drind.2016.1547
Physical Properties of Boards Manufactured with Hygrothermally Treated Tepa (Laureliopsis Philippiana Looser) Particles
Rommel Crespo Gutiérrez
; Fakultet znanosti o okolišu, Državno tehničko sveučilište u Quevedu, Quevedo, Ekvador
Luis Valenzuela
; Odjel za gospodarenje šumama i okolišem, Šumarski fakultet, Sveučilište u Concepciónu, Concepción, Čile
Hernán Wilson Poblete
; Laboratorij za šumske proizvode, Fakultet znanosti o šumama i prirodnim resursima, Južno sveučilište u Čileu, Valdivia-Čile
Sažetak
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.
Ključne riječi
Particleboard; hygrothermal treatment; Laureliopsis philippiana; physical properties; dimensional stability
Hrčak ID:
166912
URI
Datum izdavanja:
30.9.2016.
Posjeta: 1.719 *