Tannin Adhesive from Stryphnodendron adstringens (Mart.) Coville in Plywood Panels

Carvalho, Amélia Guimarães; Zanuncio, Antônio José Vinha; Mori, Fábio Akira; Mendes, Rafael Farinassi; Silva, Marcela G. da; Mendes, Lourival Marin

doi:10.15376/biores.9.2.2659-2670

Cited by 15 publications

(9 citation statements)

References 12 publications

(10 reference statements)

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“…For exterior use, the sengon and jabon glulams fulfilled JAS standards for both cold-water (maximum 5%) and hot-water conditions (maximum 10%). This result was similar to Amelia et al (2014) mentioning that tannin adhesive from Barbatimão using for plywood had a good performance in both humid and dry environments. With respect to glulam properties and the analysis of variance in Table 4, in terms of shear strength, cold-water delamination, MOE, and MOR, the adhesion quality of tannin adhesive was no different from that of MDI.…”

Section: Delamination Testsupporting

confidence: 89%

Glulam Properties of Fast-growing Species Using Mahogany Tannin Adhesive

Lestari¹,

Hadi²,

Hermawan³

et al. 2015

BioResources

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Manufacturing glued laminated timber (glulam) can help overcome the limited availability of large-sized timber, and the use of bio-adhesives may resolve environmental problems associated with synthetic adhesives containing high formaldehyde contents. Tannin adhesive is a bio-adhesive that can be used as alternative glue in the manufacture of glulam. The purpose of this study was to determine the physical and mechanical properties of glulam made with mahogany (Swietenia sp.) tannin adhesive and wood from three fast-growing species, namely pine (Pinus merkusii), jabon (Anthocephalus cadamba), and sengon (Falcataria moluccana). Glulam (3 cm × 6 cm × 120 cm in thickness, width, and length, respectively) was manufactured with three layers of lamina. The physical and mechanical properties of the glulams were tested based on relevant standards. The results showed that pine glulam fulfilled the standard for the modulus of rupture and modulus of elasticity, while sengon glulam met the standard for shear strength. In the delamination test, sengon glulam was resistant to immersion in cold water and hot water. All glulams had low formaldehyde emission levels and therefore fulfilled the standard requirements. The results showed that the tannin adhesive from mahogany bark was equal in quality to methylene diphenyl di-isocyanate for glulam manufacturing.

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Section: Delamination Testsupporting

confidence: 89%

Glulam Properties of Fast-growing Species Using Mahogany Tannin Adhesive

Lestari¹,

Hadi²,

Hermawan³

et al. 2015

BioResources

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“…Forestry sector represents 1,1% of the gross national product in Brazil (IBA, 2014), and the biomass produced can be used for cellulose pulp (PIRRALHO et al, 2014), energy (SOARES et al, 2014;ZANUNCIO et al, 2014a), panels CARVALHO et al, 2014b), and lumber production (KWON et al, 2014;SALCA;HIZIROGLU, 2014). In all these sectors, wood drying is necessary.…”

Section: Introductionmentioning

confidence: 99%

Artificial Neural Networks as a New Tool for Assessing and Monitoring Wood Moisture Content

et al. 2016

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-Drying of wood is necessary for its use and moisture control is important during this process. The aim of this study was to use artificial neural networks to evaluate and monitor the wood moisture content during drying. Wood samples of 2 × 2 × 4 cm were taken at 1.3 m above the ground, outside of radial direction, from seven 2-year-old materials and three 7-year-old materials. These samples were saturated and drying was evaluated until the equilibrium moisture content, then, the artificial neural networks were created. The materials with higher initial moisture reached equilibrium moisture content faster due to its higher drying rate. The basic density of all wood materials was inversely proportional at the beginning and directly proportional to the moisture at the end of drying. All artificial neural networks used in this work showed high accuracy to estimate the moisture, however, the neural network based on the basic density and drying days was the best. Therefore, artificial neural networks can be used to control the moisture content of wood during drying.Keywords: Eucalyptus urophylla × Eucalyptus grandis; Drying; Modeling.REDES NEURAIS ARTIFICIAIS COMO NOVA FERRAMENTA PARA AVALIAÇÃO E MONITORAMENTO DA UMIDADE DA MADEIRA RESUMO -A secagem da madeira é necessária para sua utilização e o controle da umidade é fundamental durante este processo. O objetivo deste trabalho foi utilizar redes neurais artificiais para avaliar e monitorar a umidade da madeira durante a secagem. Amostras de 2 x 2 x 4 cm foram retiradas a 1,3 metros acima do solo na parte externa no sentido radial de sete materiais de dois anos e três de sete anos de Eucalyptus urophylla x Eucalyptus grandis. Essas amostras foram saturadas e sua secagem avaliada até a umidade de equilíbrio, logo após, foram criadas as redes neurais artificiais. Os materiais com maior umidade inicial atingiram a umidade de equilíbrio mais rápido, devido a maior taxa de secagem. A densidade básica da madeira de todos os materiais foi inversamente proporcional no inicio e diretamente proporcional à umidade no final da secagem. A rede neural artificial baseada na densidade básica e nos dias de secagem apresentou alta precisão para avaliar e monitorar a umidade da madeira. Portanto, as redes neurais artificiais podem ser utilizadas para controle da umidade da madeira durante a secagem.Palavras-chave: Eucalyptus urophylla × Eucalyptus grandis; Modelagem; Secagem. 544Revista Árvore, Viçosa-MG, v.40, n.3, p.543-549, 2016 ZANUNCIO, A.J.V. et al.

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“…and condensed tannins (polymers of flavonoids) although other tannins occur which are combinations of these two basic structures [10]. They are secondary metabolites that help defend plants against solar radiation, herbivores, and pathogens [8]. Vis-à-vis with their uses Elephantopus sp.…”

Section: Ijppe Volume 13mentioning

confidence: 99%

Quantitative Ethnobotanical Study, Phytochemical Screening and Antibacterial Assay of Ethnomedicinal Plants of T’boli In Lemsnolon, Tboli, South Cotabato

Tumamac

Dorado

2019

IJPPE

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Tbolis in Lemsnolon, Tboli, South Cotabato are one of the ethnic groups in the Philippines serving as repository of novel knowledge on ethnomedicine. On July 2014, a research was conducted among Tboli tribe in Lemsnolon to document the local knowledge on ethnomedicinal plants before environmental and cultural changes deplete the resources. Selected important ethnomedicinal plants were quantified through Relative Frequency Citation and Use Value. Selected important medicinal plants were screened for phytochemical constituents, and their antibacterial property was determined through paper disc diffusion method. A total of 28 medicinal plants belonging to 21 families were recorded, most are used for symptoms, signs and abnormal clinical and laboratory findings (13spp.) and certain infectious and parasitic diseases (5spp.). The most abundant medicinal plant families were Asteraceae (5spp.) and Euphorbiaceae (3spp.), the most dominant life forms of the species includes herbs (17spp.) followed by shrubs (4spp.), the most frequent used part were leaves (42%) followed by stems (11%), the most common preparation method was decoction (47%), the most common route of administration is through oral (66%). Artemisia vulgaris, Bryophyllum pinnatum, Elephantopus sp., Emilia sonchifolia, Ficus pseudopalma, Hyptis capitata, and Leucaena glauca have the highest RFC (0.29), E. sonchifolia has the highest Use Value (0.71).Selected important ethnomedicinal plants, Artemisia vulgaris, Costus malorticanus, Elephantopus sp., Emilia sonchifolia and H. capitata, were found to be rich in alkaloids while free fatty acids, flavonoids, tannins and anthraquinones were present in most of these selected plants. However, ethanolic extracts of the selected important medicinal plants showed inactive zone of inhibition against S. aureus and E. coli. Results showed that plants used for healing among Tboli community in Lemsnolon are found to be possible sources of potential drugs and are subject for further phytochemical and pharmacological investigations.

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Tannin Adhesive from Stryphnodendron adstringens (Mart.) Coville in Plywood Panels

Cited by 15 publications

References 12 publications

Glulam Properties of Fast-growing Species Using Mahogany Tannin Adhesive

Glulam Properties of Fast-growing Species Using Mahogany Tannin Adhesive

Artificial Neural Networks as a New Tool for Assessing and Monitoring Wood Moisture Content

Quantitative Ethnobotanical Study, Phytochemical Screening and Antibacterial Assay of Ethnomedicinal Plants of T’boli In Lemsnolon, Tboli, South Cotabato

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