Abstract
ABSTRACT The aim of this study was to evaluate the effect of different radial regions of Pinus oocarpa wood on the physical and mechanical properties of particleboard panels. Three different radial regions (internal, intermediate and external) and the mixture (integral log) were assessed. Experimental panels were produced with a nominal density of 0.70 g/cm3 using 8% urea-formaldehyde adhesive; they were compressed at a specific pressure of 40 kgf/cm2 and temperature of 160 °C, for 8 minutes. Wood radial position affected particleboard quality and a direct influence of the chemical composition and density of the material used was observed. Only the panels produced the mixture (integral log) and with the internal region met all the requirements stipulated by the marketing standard.
Highlights
Some studies have been conducted on the use of wood residues for the production of particleboard panels, obtaining good results with the use of chips and shavings generated by the planning of sapwood and/or heartwood (Dacosta et al, 2005; Cabral et al, 2007), with different sawmill residues (Iwakiri et al, 2000, 2012; Felix et al, 2016) from log rounding process for lamination (Guimarães et al, 2011) and for particleboard production in laboratory scale
It was observed that the evaluated regions showed statistical difference regarding the chemical constitution, which confirms the good separation of the regions within the assessed logs (Table 2)
When compared to the standard, only the panels produced with the integral log and with the internal region met all the requirements stipulated by the commercial standard
Summary
The wood and lumber industry in Brazil generates a large amount of residue. Some studies have been conducted on the use of wood residues for the production of particleboard panels, obtaining good results with the use of chips and shavings generated by the planning of sapwood and/or heartwood (Dacosta et al, 2005; Cabral et al, 2007), with different sawmill residues (Iwakiri et al, 2000, 2012; Felix et al, 2016) from log rounding process for lamination (Guimarães et al, 2011) and for particleboard production in laboratory scale. It is well known that anatomical, physical, chemical and mechanical differences between the regions of a wood log provide different types of bonding and resistance to particleboards, directly affecting the final quality of panels and their applications, no studies comparing the effects of different wood radial regions on particleboard properties have been conducted to date
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