Anatomical study of short-term thermo-mechanically densified alder wood veneer with low moisture content

Bekhta, Pavlo; Mamoňová, Miroslava; Sedliacik, J; Novák, Igor

doi:10.1007/s00107-016-1033-2

Cited by 18 publications

(10 citation statements)

References 23 publications

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“…In the analyzed samples, a decrease of veneers mass and a non-proportional decrease in veneers volume may be the main causes for the density decrease observed in Norway spruce for longer treatment intensity. Other authors reported density increase for both hardwood and softwood after densification, on average of 130% for wood blocks of five species [17], 76% for beech wood strips [12], 66 and 60% for Lignamon and steam-densified beech, respectively [32], 47% for beech veneers [33], 23% for birch wood strips [7], 42% for scots pine wood strips [10], 72% for scots pine veneers [20], 138% for Norway spruce wood strips [12] and 78% for radiata pine wood strips [34]. Given the wide variety of densification treatments, a more in-depth comparison might be useful to provide a better understanding of the true effectiveness of the treatment herein applied.…”

Section: Veneer Densitymentioning

confidence: 99%

Effects of an innovative densification process on mechanical and physical properties of beech and Norway spruce veneers

et al. 2021

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Increased wood density is obtained by compressing the wood porous structure under suitable moisture and temperature conditions to improve its physical, mechanical and color properties. A recently proposed wood densification method based on partial removal of lignin and hemicellulose in hot water solution of sodium hydroxide and sodium sulphite has shown promising results on solid wood. However, its applicability and effect on thin wood veneers have not been tested yet. In this study, the timing of the method has been adapted to estimate the densification treatment intensity dependence of wood properties (wood density and modulus of elasticity) and color change of softwood (Norway spruce) and hardwood (beech) veneers. Compared to control, density and rigidity increased, with improved wood properties peaking after only 90 s of treatment intensity. Furthermore, the color became darker after treatment compared to control, with no significant color difference between treatment intensities. In conclusion, densification of veneers, according to the presented adapted method, provides a significant improvement of veneers physical and mechanical properties, and produces color changes perceptible by the human eye. Our results can be further implemented and adapted to application in industrial plants, calling for new application of densified veneers.

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Section: Veneer Densitymentioning

confidence: 99%

Effects of an innovative densification process on mechanical and physical properties of beech and Norway spruce veneers

et al. 2021

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“…Bekhta et al [15] observed that cell wall lumen was reduced and that cells were deformed and fractured allowing the improvement of the 8 Advances in Materials Science and Engineering veneer densification. Recently, Bekhta et al [34] observed significant deformation of vessels and fibers, even in wood veneer subjected to a short-term densification process.…”

Section: Control Treatedmentioning

confidence: 99%

Properties of a Laminated Wood Composite Produced with Thermomechanically Treated Veneers

Arruda¹,

Menezzi²

2016

Advances in Materials Science and Engineering

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The paper aimed at evaluating the properties of plywood made from thermomechanically treated wood veneers. Veneers from Amescla (Trattinnickia burseraefolia) wood were treated in a hydraulic press with electric resistance heating. Two temperature levels were applied, 140°C and 180°C, for 1 and 2 minutes with 2.7 N/mm2of pressure. A total of 30 plywood boards were produced, including six boards produced from untreated veneers. The results showed that the thermomechanical treatment did not have any deleterious effect on glue line strength and most of the mechanical properties of plywood made from treated veneers were improved. On the other hand, plywood made from untreated veneers presented better dimensional stability. Dimensional stability properties were most affected by the temperature of the treatment, while mechanical stability, represented by the glue line shear strength, was positively affected by temperature and duration of the treatment.

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“…The cell wall is mainly composed of cellulose, hemicelluloses, and lignin, and cellulose fibrils are joined with soft matrix, consisting of hemicelluloses and lignin (Sandberg et al 2017). Wood modification is a term describing the application of either chemical, mechanical, physical, or biological methods to alter the properties of the wood (Bekhta et al 2015, Bekhta et al 2016, Hill et al 2006). The modified wood should itself be nontoxic under service conditions, and furthermore, there should be no release of any toxic substances during service, or at end of life, following disposal or recycling of the modified wood (Sandberg et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Properties of water steam-treated maple wood (Acer pseudoplatanus L.).

Novák¹,

Kleinová²,

Janigová³

et al. 2020

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Anatomical study of short-term thermo-mechanically densified alder wood veneer with low moisture content

Cited by 18 publications

References 23 publications

Effects of an innovative densification process on mechanical and physical properties of beech and Norway spruce veneers

Effects of an innovative densification process on mechanical and physical properties of beech and Norway spruce veneers

Properties of a Laminated Wood Composite Produced with Thermomechanically Treated Veneers

Properties of water steam-treated maple wood (Acer pseudoplatanus L.).

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