Hybrid Sandwich Particleboard Made with Sugarcane, Pínus Taeda Thermally Treated and Malva Fibre from Amazon

Abstract

A multilayer particleboard panels, consisted of sugarcane bagasse reinforced composite as core material and hybrid composites made with Pinus taeda particles and Malva fibres as facing materials, were designed and evaluated in this work. Tukey test was used to identify the effect of the facing material, considering different combinations of Pinus taeda particles and Malva fibres, on the bulk density, thickness swelling, flexural strength, flexural stiffness and X-ray densitometry. A spray-up process was used to spread castor oil based polyurethane resin upon the dispersive phases followed by a hot compaction at 100 o C. The particleboards were classified as medium density panels in accordance to the Brazilian, American and Canadian Standards. All treatments reached the minimum strength except for elastic modulus. Tukey test demonstrated the flexural strength and modulus responses for all treatments were statistically similar. Hybrid particleboard consisted of 75% of Pinus taeda wood and 25% of Malva fibres revealed a promising sustainable material for furniture industries, combining strength, low-cost and lower thickness swelling values.

Anatomical tool in the identification of ploids in maize seedlings and potential use in initial stage of double haploides obtainment process

“…It was possible through the analysis of mixed model to verify the existence of variability in the anatomical characteristics, i.e., there is a difference among the tested materials (P < 0.01) (Table 1). In addition, these variables showed a quality required for insertion in a breeding program, with the aim of separation of evaluated materials [34]. The heritability and accuracy obtained were high in accordance with the classification made by [31] (Table 1).…”

Influence of treatment with water-soluble CCB preservative on the physical-mechanical properties of brazilian tropical timber

“…Researches in matter of characterization of tropical wood species need to be further explored, since knowledge in this field is still incomplete, mainly due to growing demand for timber products and consequent the introduction of new fast growing tropical wood species, in recent years [22][23][24][25] . These species present medium to low density and must receive preservation treatment to ensure their durability in service.…”

Paineis híbridos de lâminas e partículas de madeira para uso estrutural

“…Após a pré-prensagem, os painéis foram prensados a quente (Figura 3b) à temperatura de 100 °C com pressão de 4 MPa durante 10 minutos (SILVA et al, 2018). Para estabilização e cura do adesivo, os painéis permaneceram durante 72 horas em processo de cura.…”

“…Levando-se em consideração que painéis OSB e compensados têm uso estrutural (DEMIRKIR et al, 2016;ZHOU;PIZZI, 2014) e painéis de material particulado de madeira não atingem requisitos estruturais (SILVA et al, 2014(SILVA et al, , 2018, uma alternativa a fim de aprimorar o uso de painéis de partículas de madeira para fins estruturais consiste na confecção de painéis híbridos, com as camadas externas sendo compostas de fibras de madeira, e na camada interna partículas de madeira, com as camadas unidas por adesivo. Na literatura correlata, poucos trabalhos abordam a fabricação e a caracterização de painéis híbridos de madeira (NURHAZWANI et al, 2016;SILVA et al, 2018). Nurhazwani et al (2016) avaliaram as propriedades físicas e mecânicas de painéis compostos de partículas de Hevea brasiliensis, lâminas de bambu e resina ureia-formaldeído.…”

“…O teor de umidade das partículas foi igual a 12%, e o teor de resina foi igual a 65% em relação à massa sólida das partículas. Silva et al (2018) produziram painéis utilizando fibras de Pinus taeda e Malva e partículas de bagaço de cana-de-açúcar com o uso de resina poliuretana à base de óleo de mamona. O painel foi prensado a 100 °C e com pressão de 4 MPa, apresentando as partículas teor de umidade próximo de 12% (ABNT, 2013).…”