Massa específica da madeira, rendimento da laminação e qualidade das lâminas de Pinus patula Schltdl &amp; Cham

Tavares, Everton Lorenzett; Hillig, Éverton; Bednarczuk, Ezaquel; Machado, João Fábio; Mustefaga, Erick Chagas

doi:10.12953/2177-6830/rcm.v9n2p103-112

Cited by 3 publications

(1 citation statement)

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“…The results obtained for lamination yield were superior to the one found by Palma (2012) for the same species, whose value was 36.60%. However, these values were inferior when compared to the average values found by Tavares et al (2018) for Pinus patula, which obtained an average yield of 45%.…”

Section: Basic Density and Lamination Yieldcontrasting

confidence: 63%

STUDY ON THE FEASIBILITY OF VENEER AND PLYWOOD PRODUCTION OF Hevea brasiliensis – CLONE RRIM600

Raia¹,

Iwakiri²,

Trianoski³

et al. 2022

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Hevea brasiliensis is a very prominent species in Brazil, but there are few studies correlating this species with wood panels production. Based on this, the aim of this work was to evaluate the technical feasibility of laminating and plywood production of Hevea brasiliensis varying the weight and solids content of the glue mixture on the mechanical properties. Phenolic plywood with five 2.0 thick veneers was produced in the laboratory, with two different solids contents of the glue mixture: 35 and 40%, and three different glue weights: 140, 160 and 180 g/m2. The panels were pressed for 10 minutes at 140°C on pressure of 10 kg/cm2. The laminate yield, basic density, and resistance of the glue line to shearing and static bending were evaluated. The lamination yield showed satisfactory results. The lower weight panels produced do not meet the minimum requirement of EN 314-2 and the others two had statistically equal means, and the use of 160 g/m² weight is recommended. The solids content of the glue mix influenced the mechanical properties, but the results still higher than those obtained for Pinus taeda. The results of this study indicate the potential for using Hevea brasiliensis in veneers and plywood production.

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Section: Basic Density and Lamination Yieldcontrasting

confidence: 63%

STUDY ON THE FEASIBILITY OF VENEER AND PLYWOOD PRODUCTION OF Hevea brasiliensis – CLONE RRIM600

Raia¹,

Iwakiri²,

Trianoski³

et al. 2022

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Variation in wood properties of Pinus patula from different provenances

Lima,

Freitas,

Ranzini

et al. 2024

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Propriedades da madeira de Pinus patula de diferentes procedências plantadas em Itapeva, SP, Brasil. Desde as décadas de 60 e 70, Pinus spp. têm sido uma alternativa às espécies nativas do Brasil para certos usos na indústria madeireira. Assim, se justifica a importância de saber quais espécies de Pinus são as mais indicadas para o plantio em diferentes localidades do Brasil. No presente estudo, objetivamos ampliar o conhecimento da madeira de Pinus patula de diferentes procedências de sementes plantadas em Itapeva, São Paulo, Brasil, estudando a variabilidade em propriedades físicas, mecânicas e anatômicas e comparando-as com Pinus elliottii var. elliottii, espécie já utilizada tradicionalmente pela indústria madeireira brasileira. Espera-se que nossos achados forneçam subsídios para novos estudos voltados ao melhoramento genético de P. patula e, assim, contribuam para suprir a demanda por matérias-primas de boa qualidade. Para tanto, aos 31 anos foram coletadas 25 árvores, cinco de cada espécie/procedência. Não encontramos diferença entre os materiais estudados para espessura da parede das traqueídes, resistência à compressão paralela às fibras, resistência ao cisalhamento tangencial aos anéis de crescimento e módulo de ruptura. Pinus elliottii apresentou menor comprimento de traqueíde em comparação com as procedências de Pinus patula. Todas as propriedades avaliadas aumentaram em direção à casca, mas a partir da posição de 75%, os valores de todas as propriedades tenderam a se estabilizar, indicando maior presença de lenho adulto. Nossos resultados mostram que Pinus patula pode ser indicado para fins estruturais.

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Properties of patula pine plywood using phenolic resin-impregnated veneers

Bednarczuk,

Tavares,

Hillig

et al. 2024

Cad. Pedagógico

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Having observed the need for structural panels for external use, it is important to study methods of treating wood from new forest species, with less harmful products. In this sense, veneers of Pinus patula wood were subjected to immersion treatment in phenolic resin diluted in water at 5% solids content for one minute, and subsequently used to produce plywood panels using phenol-formaldehyde resin, with a weight of 160 g /m² in single line. The experimental design included four types of panels: fresh veneers glued with 35% resin solids content, treated veneers glued with 12%, 23% and 35% resin solids content. The physical-mechanical properties of the panels were compared with the parameters defined by the Brazilian Association of the Mechanically Processed Wood Industry (ABIMCI) and the Brazilian Association of Technical Standards (ABNT). The panels produced presented apparent density and bonding quality results below the minimum recommendations established in these technical parameters, in addition to water absorption higher than the values found in research with other pine species. However, veneer panels treated with phenolic resin showed better bonding quality than untreated panels for the same resin solids content. In less severe conditions, such as in the wet bonding test, the use of 23% resin solids content maintained bonding quality compared to 35% untreated wood. Therefore, further studies are suggested on the use of wood veneers treated with phenol and to reduce the resin solids content for to reduce costs and harmful effects on the environment.

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Massa específica da madeira, rendimento da laminação e qualidade das lâminas de Pinus patula Schltdl & Cham

Cited by 3 publications

References 0 publications

STUDY ON THE FEASIBILITY OF VENEER AND PLYWOOD PRODUCTION OF Hevea brasiliensis – CLONE RRIM600

STUDY ON THE FEASIBILITY OF VENEER AND PLYWOOD PRODUCTION OF Hevea brasiliensis – CLONE RRIM600

Variation in wood properties of Pinus patula from different provenances

Properties of patula pine plywood using phenolic resin-impregnated veneers

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