Abstract
The objective of this work was to evaluate the quality of particleboard produced with 100% of wood of Cupressus torulosa and in different mixing proportions with Pinus taeda. The experimental panels were produced with wood particles of Cupressus torulosa/Pinus taeda, in proportions of 100/0%, 80/20%, 60/40%, 40/60%, 20/80% and 0/100%, totaling six treatments. The panels were produced with nominal density of 0.75g/cm³, 8% urea-formaldehyde resin and 1% paraffin emulsion. The quality of the panels was evaluated by water absorption and swelling thickness 2 and 24 hours, static bending (MOE and MOR), perpendicular tension (internal bonding) and screw withdrawal. The comparative evaluations of the results of this research, with the Pinus taeda, others species referenced in the literature, and normative requirements of EN 312-2003 for commercial panels, indicated great potential of the wood of Cupressus torulosa for the particleboard production.
Highlights
The main source of raw material for the particleboard industries in Brazil comes from the planted forests of Pinus and Eucalyptus
The average values of density of the panels were all lower than the established nominal value of 0.75 g/cm3 and the panels produced with 100% Cupressus torulosa wood were statistically lighter than the other types of panels
1.501 (5.13) d 1.566 (4.82) c 1.588 (5.23) bc 1.595 (5.74) bc 1.624 (6.88) ab 1.666 (5.82) a BD: basic density of wood; D: density; Averages followed by the same letter do not differ statistically at the level of probability of 95% by Tukey's test; values in parentheses correspond to the variation coefficient (%)
Summary
The main source of raw material for the particleboard industries in Brazil comes from the planted forests of Pinus and Eucalyptus. Due to the high demand for wood from the pulp and paper industries, wood panels and sawmills, there is a need for studies on fast-growing alternative species for the formation of production forests for the supply of industrial raw materials. Studies have been conducted by several researchers on technological evaluations of wood of alternative species of fast growth aiming its use for the production of wood panels, such as Acrocarpus fraxinifolius Wight & Arn., Toona ciliata M. (TRIANOSKI et al, 2011); Schizolobium amazonicum e Sida sp. Cunn (TRIANOSKI et al, 2016); Schizolobium amazonicum and Cecropia sp. The results obtained by these researchers indicated the feasibility of using 100% of these species or in a mixture with Pinus woods for the production of particleboards
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