Cisalhamento na Linha de Cola de Eucalyptus sp. Colado com Diferentes Adesivos e Diferentes Gramaturas

Bianche, Juliana Jerásio; Teixeira, Ana Paula Mendes; Ladeira, João Paulo Silva; Carneiro, Angélica de Cássia Oliveira; Castro, Renato Vinícius Oliveira; Lucia, Ricardo Marius Della

doi:10.1590/2179-8087.077114

Cited by 15 publications

(11 citation statements)

References 3 publications

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“…Sulfi tation during the hot-water extraction step can be used for this purpose. According to Bianche et al (2017), greater wood density means less porosity and hence less penetration of the adhesive in the wood structure. When the adhesive penetration is adequate, the contact surface area between adhesive and wood is also suitable for good mechanical anchoring of the adhesive (Frihart and Hunt 2010).…”

Section: Discussionmentioning

confidence: 99%

PROPERTIES OF CROSS-LAMINATED TIMBER BONDED WITH AN ADHESIVE BASED ON TANNINS FROM THE BARK OF Mimosa tenuiflora TREES

et al. 2022

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This study aimed to determine the concentration of condensed tannins in the bark of Mimosa tenuiflora (Willd) Poir trees. Additionally, the physical-mechanical properties of cross-laminated timber (CLT) panels bonded with an adhesive based on M. tenuiflora tannins were assessed. Bark was collected from five trees. The adhesive formulation was synthesized by mixing powdered tannins, paraformaldehyde, and water at 50 °C under continuous stirring. Bark tannins extract in its pristine state without any previous chemical treatment or modification was employed to synthesize the adhesive. Viscosity, pH, solids content, and gel time of the adhesive formulation were determined. CLT panels were manufactured with Eucalyptus spp. wood. The bonding performance was assessed by determining the physical (apparent density and water absorption) and mechanical (modulus of elasticity – MOE, modulus of rupture – MOR, and shear strength) properties of the CLT panels. Condensed tannins content in the M. tenuiflora bark was 23.4%. Adhesive properties were pH = 3.93, TS of 50.64%, gel time of 460 s, and 6,000 cP for viscosity. Values of MOE, MOR and shear strength were 4,411, 16.18, and 1.06 MPa, respectively. The M. tenuiflora tannins are promising for the formulation of adhesives to bond CLT.

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Section: Discussionmentioning

confidence: 99%

PROPERTIES OF CROSS-LAMINATED TIMBER BONDED WITH AN ADHESIVE BASED ON TANNINS FROM THE BARK OF Mimosa tenuiflora TREES

et al. 2022

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“…This method was used by Pimentel et al (2021), who evaluated the percentage of failure of seven species of tropical Amazonian wood bonded with PUR and PVA (polyvinyl acetate crosslink) adhesive. Bianche et al (2017) also used this method to evaluate the percentage of failure in eucalyptus wood glued with six diff erent types of adhesives, including castor oil-based bicomponent polyurethane.…”

Section: Wood Failure Percentagementioning

confidence: 99%

“…Adhesive refers to the product that can maintain the connection between materials. Such a product has the function, in addition to the adhesion between materials, the fl uidity and fi lling of empty spaces between the joints, causing a decrease in the distance between them (Bianche et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

SHEAR STRENGTH OF Pinus sp. JOINTS BONDED WITH DIFFERENT GRAMMAGES AND PRESSURES

Tomé,

Petrauski,

Possa

et al. 2023

Rev. Árvore

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The main function of the adhesive is to promote adhesion between materials, as well as provide fluidity and fill in the gaps between joints. Information such as grammage and bonding pressure is fundamental when it comes to the execution of structures in glued laminated wood. In this sense, the objective of this study was to evaluate the shear strength in compression of bonded joints using a one-component polyurethane adhesive with cold curing at three different gram levels, being 150 g.m-2, 200 g.m-2 and 250 g.m-2, with spreading on a single face, applied at two pressure levels, 0.7 MPa, and 1.0 MPa. The apparent density was determined, and with that, four blocks/density groups were obtained, which comprised four repetitions. In addition, the percentage of failure in the specimens after performing the shear test was analyzed. Statistical data analysis was carried out adopting a randomized design in a 2x3 factorial block to analyze the effects of grammage and bonding pressure on wood strength and failure The homogeneity and normality of the data were tested, and later the analysis of variance (ANOVA). The results showed that the joints’ strength was not affected, both for weight and pressure levels. As for the wood failure percentage, the values obtained were low, with averages below 35%.

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“…This adhesive, free from formaldehyde in its composition, is extracted from the Ricinus communis seed, thus originating from a renewable source. It eliminates the need for paraffin emulsion, exhibits high mechanical performance, and has a lower curing temperature compared to formaldehyde-based adhesives, reducing electricity consumption in the industry (Bertolini et al, 2014;Bianche et al, 2017;Almeida et al, 2021;Galdino et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Physical-mechanical properties of MDP panels with the addition of melamine paper in the internal layer

Franco,

Silva,

Prates

et al. 2024

Cad. Pedagógico

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Particleboard panels find extensive application in the furniture sector, but their low stability in contact with water hinders their utilization. Simultaneously, the trimmings of melamine paper, exhibiting hydrophobic properties, used in panel finishing, represent unused industrial waste. This study aimed to evaluate the physical-mechanical properties of MDP (Medium Density Particleboard) panels produced with Pinus taeda and castor oil-based polyurethane resin with the addition of different proportions of melamine paper (0, 5, and 10%). The properties of density, moisture content, thickness swelling, water absorption, static bending, internal bonding, and screw withdrawal resistance, on face and top, were evaluated, following normative documents. At the end of the tests, statistical analysis was conducted at a 5% significance level to check any statistical differences among the means. The addition of melamine paper caused to an increase in panel density and moisture content, but all treatments remained within the ideal range. Thickness swelling and water absorption decreased, while all mechanical properties improved with an increase in the quantity of added melamine paper. Therefore, the use of melamine paper in MDP panels is viable and beneficial, notably the treatment with a 10% addition of melamine paper.

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Cisalhamento na Linha de Cola de Eucalyptus sp. Colado com Diferentes Adesivos e Diferentes Gramaturas

Cited by 15 publications

References 3 publications

PROPERTIES OF CROSS-LAMINATED TIMBER BONDED WITH AN ADHESIVE BASED ON TANNINS FROM THE BARK OF Mimosa tenuiflora TREES

PROPERTIES OF CROSS-LAMINATED TIMBER BONDED WITH AN ADHESIVE BASED ON TANNINS FROM THE BARK OF Mimosa tenuiflora TREES

SHEAR STRENGTH OF Pinus sp. JOINTS BONDED WITH DIFFERENT GRAMMAGES AND PRESSURES

Physical-mechanical properties of MDP panels with the addition of melamine paper in the internal layer

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