Effects of heat treatment on the behavior of teak wood adherends bonded joints

Budhe, S.; Ghugal, S.; Barros, Sílvio de

doi:10.1186/s40563-020-00124-5

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…This was assumed to be due to the removal of hemicellulose, the depolymerization of hydrocarbons and lignin, or the increase in the degree of crystallinity of the amorphous cellulose [18]. While conducting research with Indian teak boards, BUDHE et al [19] found that the heat treatment decreased the wood surface wettability. In research with Pinus caribaea, SANTOS and SILVA [20] observed that the process of thermal modification influenced the wood's physical properties, promoting a reduction in the equilibrium moisture, a lower hygroscopicity, and greater dimensional stability, in addition to evidencing the notoriety of the material subjected to a higher temperature.…”

Section: Bulk Density and Moisture Contentmentioning

confidence: 99%

Improvement of the properties of hardboard with heat treatment application

et al. 2023

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The attempt to face the limitations of wood-based materials, especially concerning the relationship with water, is still a considerable gap in research on this subject. The present work proposes the accomplishment of thermal treatment in fiberboard-type hardboard, using different temperatures and times, to evaluate the effect on the physical-mechanical properties. The parameters of the heat treatment were temperatures of 120 and 160 °C and times of 20 and 40 min. The hardboards were individually heat treated in a kiln. The characterization was performed from physical tests such as bulk density, moisture content, water absorption (2 and 24 h), thickness swelling (2 and 24 h); and mechanical properties of flexural strength. The treatment with a temperature of 160 °C for 40 min showed the lowest values of water absorption in 24 h (34%). Thickness swelling was lower compared to control, for all the treatments applied. Regarding flexural strength, the treatment that adopted the 160 °C for 20 min showed the highest MOR value (26.3 MPa). In general, the performance of heat treatments positively influenced the physical and mechanical properties of the hardboards, being an interesting alternative in the development of products for applications in internal environments.

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Section: Bulk Density and Moisture Contentmentioning

confidence: 99%

Improvement of the properties of hardboard with heat treatment application

et al. 2023

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Results of experimental studies on the strength of adhesive-bonded joints of thermally modified ash wood

Datskiv,

Kshyvetskyi

2023

Ukr. j. for. wood sci.

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It is necessary to ensure the protection of the adhesive-bonded wood structures from the effects of temperature and humidity loads to improve their performance characteristics and increase the service life – this determines the relevance of this study. The purpose of the study is to examine, using a long-term method, the strength of thermoplastic adhesive-bonded joints of thermally modified ash wood and unmodified pine wood. The data were subjected to statistical processing and analysis. The experimental samples for the studies were prepared according to the proposed methodology in production conditions according to the existing technological process. The studies continued for two years, with periodic inspection of the samples and recording of the changes that occurred during the experiments. Regularly, every three months of the study, part of the samples was removed from the stand and tested to determine the change in strength. Methods were selected and described for conducting long-term experimental studies to determine the strength of adhesive joints of thermally modified ash wood and unmodified pine wood glued with polyvinyl acetate-based adhesives with durability class D4. Based on the study results, it was identified that the average strength of control samples of the thermally modified ash wood and unmodified pine wood was 7.12 MPa, and after two years of long-term testing, it decreased to 5.13 MPa (27.9%). In addition, it was identified that the operation of such adhesive-bonded joints in natural conditions depends on the cyclic temperature-and-humidity load. Namely, in the summer-autumn period, the strength decreases, while in the winter-spring period, it remains unchanged, and in some cases, increases. The obtained results are of great practical importance, since such adhesive-bonded structures, can be used for the manufacture of joinery and building products, which will improve their performance characteristics and increase their service life

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Properties of Plywood Made of Thermally Treated Veneers Bonded with Castor Oil-Based Polyurethane Adhesive

Galdino

Silva

Arroyo

et al. 2023

Forests

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Wood industries use thermal and thermomechanical treatments as ecological approaches to increase the durability of wood products, avoiding the need for chemical additives. In this regard, the aim of this study was to compare the physical and mechanical properties of plywood made from veneers treated at different temperatures using thermal and thermomechanical processes, with untreated panels serving as a control. The treatment process involved Pinus taeda veneers submitted to treatment in a hot press at 1.0 MPa in a laboratory oven at temperatures of 160 °C, 180 °C, and 200 °C for 30 min. For bonding the veneers, a vegetable-based polyurethane resin derived from castor oil with a grammage of 395 g/m2 was used, applying pressing conditions at 90 °C, 0.6 MPa, and 10 min. Our results indicate that temperature significantly influences plywood properties, playing a key role in the choice of equipment for the treatment process. Regardless of the method employed, the treatment resulted in an improvement in the hydrophobicity of the veneers due to the decrease in hemicellulose content. Notably, the reduction in strength and stiffness caused by the loss of cell wall polymers was not statistically significant. The treatment was successful in softening the wood material, reducing roughness, and increasing wettability. Despite a minimum of 20% reduction in glue line tension, the samples still surpassed the 1 MPa mark, showing satisfactory results. This demonstrates the feasibility of adjusting treatment variables to ensure the proper use of this adhesive.

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Effects of heat treatment on the behavior of teak wood adherends bonded joints

Cited by 4 publications

References 23 publications

Improvement of the properties of hardboard with heat treatment application

Improvement of the properties of hardboard with heat treatment application

Results of experimental studies on the strength of adhesive-bonded joints of thermally modified ash wood

Properties of Plywood Made of Thermally Treated Veneers Bonded with Castor Oil-Based Polyurethane Adhesive

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