QUALITY OF Pinus elliottii PARTICLE BOARDS BONDED WITH POLYURETHANE ADHESIVE UNDER VARIOUS COMBINATIONS OF TEMPERATURE AND PRESSURE

Abstract

This work aimed to produce homogeneous layer particle boards with residues of Pinus elliottii wood adhered with polyurethane adhesive to castor oil plant base and to evaluate the effect of the combination of pressure and temperature in the quality of the particle boards produced. To do so, 12 particle boards were manufactured, subdivided into four treatments in function of the pressure (2.0; 3.0; 3.5; and 3.5 MPa) and temperature (90; 90; 50; and 60 ºC). The particleboards were sectioned in test samples, and accomplished by physical-mechanical tests for the determination of density, swelling and absorption of water (0-2h; 2-24h; e 0-24h); rupture module and elasticity module in static bending, internal ligation and screw withdrawal. The particle boards pressed with pressure of 3.0 MPa and temperature of 90 ºC and that with pressure of 3.5 MPa and temperature of 60 ºC presented the best results. The higher temperature of pressing was the predominant variable in the quality of those particle boards manufactured.

Keywords

• aproveitamento de resíduo
• madeira aglomerada
• adesivo