Caracterização anatômica da matéria-prima e avaliação das propriedades tecnológicas de painéis MDF de madeira de Schizolobium amazonicum Huber ex Ducke e de resíduos de espécies da Amazônia.

Abstract

Anatomical characterization and evaluation of technological properties MDF manufactured from wood Schizolobium amazonicum Huber ex Ducke and waste native species of the Amazon Studies about the technological quality of MDF manufactured with wood of native species from Amazon are scare. This study aimed to evaluate the quality of MDF produced with wood Schizolobium amazonicum Huber ex Ducke, waste of veneer and log (LAM and TOR, respectively) and waste of native species from Amazon (MIX). The chips, fibers and MDF, from this material, were produced in an industrial unit MDF. In the manufacture of panels 06 treatments were adopted. The following treatments were analyzed by 03 independent experiments: Experiment 1to verify the effect of the proportion of raw material (25%-75% TOR MIX; LAM 40%-75% MIX; LAM 40%-60% MIX) on the physical and mechanical properties of the panels; Experiment 2-to verify the effect of thickness (12 and 15 mm) on the physical and mechanical properties of the panels; Experiment 3also, to verify the effect of the thickness (15 and 18 mm) on the physical and mechanical properties of the panels. The MDF panels were bonded with 13% of resin based on urea formaldehyde and 0.7% paraffin emulsion. Posteriorly, samples were obtained to conduct the moisture content, bulk density, water absorption and thickness swelling, modulus of rupture, modulus of elasticity, internal bonding, resistance to face screw-holding and edge screw-holding, tests according to NBR 15316 (ABNT, 2009). Additionally, was characterized the TOR, LAM and MIX fibers, performed before and after industrial refining chip and determined the density profile of the MDF using the technique of X-ray attenuation. To check the effect of variables on the properties of MDF an analysis of variance was performed, and subsequently the Tukey test, conducted at the 5% level of error probability. Through the analysis of tests results it was conclude: In Experiment 1, MDF panels manufactured with a mixture of wood fiber in the ratio B showed better performance in the properties of APT and APF, and the panels in C ratio showed superior performance in MOR. In Experiment 2, the panels of 12 mm showed better performance in the properties of LI and APF, and 15 mm panels perform better in AA2h, AA24h and IE24H; In Experiment 3, the panels of 18 mm panels exhibited better performance on the properties of IE2h, IE24h, MOR and MOE in static bending. 15 mm panels outperformed the properties of APT and APF. With the exception of property values LI, all MDF panels evaluated in this study met the required values by NBR 15316-2 (ABNT, 2009), for the manufacture of furniture to be used in dry conditions.

ANATOMICAL AND CHEMICAL PROPERTIES OF JUVENILE Schizolobium amazonicum WOOD

“…Anatomical information on the dimensions of Paricá wood fibers and vessels will support studies for their use in new products, such as cellulosic pulp and paper (Silva et al, 2013); LVL -Laminated Veneer Lumber (Iwakiri et al, 2010;Melo and Del Menezzi, 2015), MDF -Medium Density Fiberboard (Ribeiro, 2015) and OSB -Oriented Strand Board (Ferro et al, 2015); as well as panels and glue laminated timber -GLULAM (Terezo and Szücs, 2010;Almeida et al, 2011). In addition, the sheet bonding process for producing plywood, application of adhesives and preservatives, and the wood drying and finishing can be improved when the variability and proportion of vessel elements in Paricá wood are known in relation to age and position in the trunk.…”