Physico-mechanical properties of particleboards bonded with pine and wattle tannin-based adhesives

Kim, Sumin; Lee, Young Kyu; Kim, Hyun Joong; Lee, Hwa Hyoung

doi:10.1163/156856103770572025

Cited by 29 publications

(10 citation statements)

References 13 publications

(16 reference statements)

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“…It was shown that, for the bark boards, a higher resin content (>10%) was necessary to reach this benchmark. This is consistent with the findings of Kim et al [ 40 ]. Higher density results in higher TS, as is known from the literature [ 41 ], but this could not be confirmed in the present study, probably due to low compression.…”

Section: Resultssupporting

confidence: 94%

Bark Thermal Insulation Panels: An Explorative Study on the Effects of Bark Species

2020

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Tree bark is a byproduct of the timber industry which accrues in large amounts, because approximately 10% of the volume a log is bark. Bark is used primarily for low-value applications such as fuel or as a soil covering material in agriculture. Within the present study, thermal insulation panels made from larch, pine, spruce, fir and oak tree bark with different resins (urea formaldehyde, melamine formaldehyde, Quebracho, Mimosa) as a binder are discussed. Also, the properties of panels made from larch bark mixed with industrial popcorn are investigated. The physical-mechanical properties of the panels, which are dependent on panel density, bark species, resin type, resin content and particle size, are analyzed. The bark species has a minor effect on the mechanical characteristics of the panels, while the compression ratio is important for the panel strength, and hence, barks with lower bulk density are preferable. Under laboratory conditions, panels made with green tannin resins proved to have adequate properties for practical use. The addition of popcorn is a means to lower the panel density, but the water absorption of such panels is comparably high. The bark type has a minor effect on the thermal conductivity of the panels; rather, this parameter is predominantly affected by the panel density.

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Section: Resultssupporting

confidence: 94%

Bark Thermal Insulation Panels: An Explorative Study on the Effects of Bark Species

2020

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“…This statement does not work in all cases of tannin-based adhesives. Kim et al [59] investigated the physical and mechanical properties of particleboard made using two types of tannin-based adhesives, wattle and pine, with three hardeners. The bending strength of the particleboard made using the wattle tannin-based adhesive with all three hardeners increased slightly, while in case of the pine tannin-based particleboard, a decrease in bending strength was observed.…”

Section: Resultsmentioning

confidence: 99%

Functionality of Beech Bark in Adhesive Mixtures Used in Plywood and Its Effect on the Stability Associated with Material Systems

et al. 2019

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The results of research into utilizing grinded beech bark in order to substitute commonly used fillers in urea formaldehyde (UF) adhesive mixtures to bond plywood are presented in the present study. Four test groups of plywood with various adhesive mixtures were manufactured under laboratory conditions and used for experimentation. Plywood made using the same technology, with the common filler (technical flour), was used as a reference material. Three different concentrations of grinded beech bark were used. The thermal conductivity of the fillers used, viscosity and its time dependence, homogeneity and the dispersion performance of fillers were evaluated in the analysis of adhesive mixture. The time necessary for heating up the material during the pressing process was a further tested parameter. The produced plywood was analyzed in terms of its modulus of elasticity, bending strength, perpendicular tensile strength and free formaldehyde emissions. Following the research results, beech bark can be characterized as an ecologically friendly alternative to technical flour, shortening the time of pressing by up to 27%. At the same time, in terms of the statistics, the mechanical properties and stability of the material changed insignificantly, and the formaldehyde emissions reduced significantly, by up to 74%. The utilization of bark was in compliance with long-term sustainability, resulting in a decrease in the environmental impact of waste generated during the wood processing.

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“…Os taninos condensados constituem mais de 95% da produção mundial de taninos comerciais ultrapassando a marca de 350.000 t/ano (GUANGCHENG et al, 1991). Kim et al (2003) avaliaram as propriedades físicas e mecânicas de chapas aglomeradas confeccionadas com tanino obtido de pinus e acácia negra. Os resultados foram satisfatórios, sendo afirmado pelos autores que a temperatura da prensa e o tempo de prensagem são fatores limitantes na utilização dos tipos de adesivos naturais aplicados para as propriedades avaliadas.…”

Section: Introductionunclassified

Influência da composição da resina tanino-uréia-formaldeído nas propriedades físicas e macânicas de chapas aglomeradas

Gonçalves¹,

Lelis

Oliveira

2008

Rev. Árvore

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RESUMO -Na fabricação de aglomerados à base de madeira são utilizados adesivos sintéticos como melaminaformaldeído (MF), fenol-formaldeído (FF), uréia-formaldeído (UF), entre outros. Devido ao alto custo desses adesivos, pesquisas que visam a introdução de alterações nas suas formulações são importantes para a redução de custos no sistema produtivo. Desta forma, este trabalho teve como objetivo estudar a influência da adição de diferentes níveis de tanino de Acacia mearnsii em uma resina comercial à base de uréia-formaldeído nas propriedades físicas e mecânicas de chapas aglomeradas. As chapas aglomeradas foram confeccionadas com madeira de Eucalyptus urophylla. Foram avaliadas quatro composições de adesivo: T1 -100% de resina UF (testemunha); (T2) 90% de resina UF + 10% de tanino 50%; (T3) 85% de resina UF + 15% de tanino 50% e (T4) 70% de resina UF + 30% de tanino 50%. Através dos ensaios, conclui-se que é possível adicionar tanino à resina uréia-formaldeído sem com isso prejudicar as propriedades físicas e mecânicas das chapas.Palavras chaves: Aglomerado, Adesivo, Tanino e Eucalyptus urophylla. INFLUENCE OF THE COMPOSITION OF TANNIN-UREA-FORMALDEHYDE RESINS IN THE PHYSICAL AND MECHANICALS PROPERTIES OF PARTICLEBOARD

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Physico-mechanical properties of particleboards bonded with pine and wattle tannin-based adhesives

Cited by 29 publications

References 13 publications

Bark Thermal Insulation Panels: An Explorative Study on the Effects of Bark Species

Bark Thermal Insulation Panels: An Explorative Study on the Effects of Bark Species

Functionality of Beech Bark in Adhesive Mixtures Used in Plywood and Its Effect on the Stability Associated with Material Systems

Influência da composição da resina tanino-uréia-formaldeído nas propriedades físicas e macânicas de chapas aglomeradas

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