The objective of this study was to evaluate the effect of heat treatment on some properties of particle boards produced with Pinus sp. packing residues. Eight percent of urea-formaldehyde base adhesive was used. The experiment was conducted in a factorial 4x3x3, being 4 proportions of heat-treated particles (25, 50, 75 and 100%), three temperatures of heat treatment (180, 200 and 220 ºC) and three replications, totaling 36 boards. Three additional boards were made with particles without heat treatment (controls), totaling 39 boards. Water absorption, thickness swelling and resistance to perpendicular tension were determined according to ABNT/NBR 14810-3 (2002). The results of these tests were compared with the values established by ABNT/ NBR 14810-3 (2002) and DIN 68 761 (1) (1961). The dimensional stability of the boards has increased with the addition of heat-treated particles, whereas mechanical properties were reduced. The effect of adding heat-treated particles on the properties of the boards was higher when using higher temperatures in heat treatment.
Heat treatment; particleboard; residues
