Abstract
ABSTRACT Wood scarcity, attacks by primates and insects, and fungal damage in forest plantations make the introduction of new species necessary. Given this, it is important to understand the potential uses of wood in the production chain. Pinus patula Schltdl & Cham presents good adaptation to Brazilian conditions and is a candidate for wood supply. Its juvenile wood density however, is lower than that of other pine species. This study aimed to evaluate the properties of veneer on panels produced with twelve-year old P. patula wood compared with panels produced with P. taeda wood of the same age, which is commonly used for panel production. Panels were bonded with urea-formaldehyde and phenol-formaldehyde adhesives using veneers applied on two types of plywood panel. The P. patula panels showed lower strength, stiffness and density when bonded with urea-formaldehyde, and higher strength, density and stiffness when bonded with phenol-formaldehyde in comparison with P. taeda. P. patula panels can be used for multilayer panel production.
Highlights
In Brazil, the plywood sector has an established production capacity of over 4 million cubic meters, with 74% of the total being exported (Vieira et al, 2012)
This study aimed to evaluate the properties of veneer on panels produced with twelve-year old P. patula wood compared with panels produced with P. taeda wood of the same age, which is commonly used for panel production
The P. patula panels showed lower strength, stiffness and density when bonded with urea-formaldehyde, and higher strength, density and stiffness when bonded with phenol-formaldehyde in comparison with P. taeda
Summary
In Brazil, the plywood sector has an established production capacity of over 4 million cubic meters, with 74% of the total being exported (Vieira et al, 2012). 70% of the plywood panels are produced with pine wood, such as Pinus taeda L. and Pinus elliottii Engelm. The wood of these trees is in high demand, making the consideration of other species for panel production necessary (Iwakiri et al, 2012). Sapajus nigritus damages P. taeda plants in Paraná and Santa Catarina state, leading to reduced wood production (Liebsch et al, 2018). In Brazil, P. patula is planted in southeast Minas Gerais, northeast São Paulo, west Santa Catarina and in the mountains of Rio Grande do Sul with wood productivity higher than P. taeda (Aguiar et al, 2014). There is no record of S. nigritus damage to Pinus patula trees
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