Measured temperature and moisture profiles during thermal modification of beech (<i>Fagus sylvatica</i> L.) and spruce (<i>Picea abies</i> L. Karst.) wood

Čermák, Petr; Horáček, Petr; Rademacher, Peter

doi:10.1515/hf-2013-0047

Cited by 11 publications

(4 citation statements)

References 31 publications

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“…Several common wood modification techniques are applied to fundamentally change the properties of wood (its bio-durability, dimensional stability, and others). Thermal modification of wood has long been recognized as a potential method to improve the natural properties of the wood and has been one of the most successful methods of modification for many years (Viitanen et al 1994;Viitaniemi et al 1997;Militz 2002;Hill 2006 and2011;Čermák et al 2014;Yan and Morrell 2014).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dimensional Stability of Thermally Modified Wood Affected by Re-Wetting Cycles

Čermák¹,

Rautkari²,

Horáček³

et al. 2015

BioResources

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The dimensional stability of thermally modified wood exposed to several wetting-drying cycles was analyzed. Specimens of dimensions 15×15 ×15 mm were thermally modified at 180 and 200 °C. The mass loss and chemical composition of the wood were determined in order to evaluate the effect and degree of modification. Afterwards, the radial, tangential, and volumetric swelling, anti-swelling efficiency, water absorption, water repellence efficiency, and mass loss due to wetting-drying cycles were determined and compared. The specimen's mass tended to decrease with each additional rewetting cycle. Additional extractives that were formed via thermal decomposition leached out during wetting cycles. Thermal modification positively affected the dimensional stability of all investigated species. The wood's swelling was reduced, a result attributed to hemicellulose degradation. Dimensional stability was improved by 24 to 30% following mild treatment and by 26 to 54% following more severe treatment. When specimens were exposed to six consecutive rewetting cycles, the swelling of the modified wood increased, whereas it slightly decreased for the control (hornification). The effective dimensional stability of thermally modified wood was reduced by 34 and 28.4% for beech, 47 and 19.6% for poplar, and 19.3 and 24.5% for spruce compared to the initial anti-swelling efficiency following the first wetting cycle.

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Section: Introductionmentioning

confidence: 99%

Analysis of Dimensional Stability of Thermally Modified Wood Affected by Re-Wetting Cycles

Čermák¹,

Rautkari²,

Horáček³

et al. 2015

BioResources

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“…Simultaneous heat and mass transfer through the porous medium of wood-based materials play a crucial role in reducing moisture content (MC) and facilitating their transformation [ 39 ]. To simulate these phenomena, a Multiphysics model was developed using COMSOL software (COMSOL Multiphysics v6.0), which models coupled heat and moisture transport in porous media (ham) based on the finite element method (FEM).…”

Section: Numerical Simulation and Analysismentioning

confidence: 99%

Thermo-Hydric Study of Wood-Based Materials under Thermal Comfort Conditions

Haddouche,

Martini,

Chaouch

et al. 2024

Materials

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This paper tackles the issue of moisture variation in wood-based materials, explicitly focusing on melamine-coated particleboard (hereafter referred to as melamine) and medium-density fiberboard (MDF) used in the third phase of wood industry transformation. The approach involves a comprehensive strategy for predicting moisture content variation, incorporating numerical simulation, experimental testing, and the application of artificial neural network (ANN) technology to enhance accuracy in furniture manufacturing. The developed ANN models are tailored to predict moisture content changes under specific thermal comfort conditions. Remarkably, these models demonstrate high precision, with an average error margin of only 1.40% for 8% moisture content (MC) and 2.85% for 12% MC in melamine, as well as 1.42% for 8% MC and 2.25% for 12% MC in MDF. These levels of precision surpass traditional models, emphasizing this study’s novelty and practical relevance to the industrial context. The findings indicate that ANN models adapt to diverse environmental conditions, presenting a robust tool for optimizing moisture management in wood-based materials. This research contributes valuable insights for improving the reliability and efficiency of moisture content predictions in the wood industry.

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“…At the level of intermediate products (e.g., boards), recent research deals with strength grading and quality assessment [105][106][107][108][109][110][111][112][113][114], adhesive technology [89,[115][116][117][118][119][120][121][122][123][124] as well as improving dimensional stability [125][126][127][128][129][130][131][132]. The grading of European beech logs and boards for the use in structural products is of increasing importance [105,113,114].…”

Section: Selected Research Fieldsmentioning

confidence: 99%

“…However, they also underline the need for adopted test methods and adhesive systems for load-bearing bonding of European beech. In regards to improving dimensional stability, thermal modification is of particular interest [126,127,[130][131][132], especially the influence of heat treatments on the mechanical properties. According to Widmann et al [127], thermal modification decreases the strength of European beech wood (except for compression parallel to the grain) but does not influence its stiffness.…”

Section: Selected Research Fieldsmentioning

confidence: 99%

The Utilization of European Beech Wood (Fagus sylvatica L.) in Europe

Pramreiter

Grabner

2023

Forests

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European beech is one of the dominating wood species in central Europe and the most abundant hardwood species in Austrian, German and Swiss forests. Today, it is predominantly used for the provision of energy and in the furniture industry. With the increasing demand on forests to provide sustainable raw materials for energy as well as products, the importance of lesser-used wood species like European beech has continuously increased over the last decade. The application in load-bearing products has gained significant interest. In order to connect the current and historical state of knowledge about this wood species, this review provides an overview of the past and present utilization of European beech wood. On the basis of the historical literature, technical approvals and standards of established products, it aims to summarize the extensive state of the art of this wood species and provide an overview of recent scientific publications in the field of wood material science. Based on the reviewed literature, current research efforts deal with different engineered wood products like glued laminated timber, cross-laminated timber and laminated veneer lumber. Furthermore, strength grading, adhesive technology as well as improving dimensional stability is of particular interest.

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Measured temperature and moisture profiles during thermal modification of beech (Fagus sylvatica L.) and spruce (Picea abies L. Karst.) wood

Cited by 11 publications

References 31 publications

Analysis of Dimensional Stability of Thermally Modified Wood Affected by Re-Wetting Cycles

Analysis of Dimensional Stability of Thermally Modified Wood Affected by Re-Wetting Cycles

Thermo-Hydric Study of Wood-Based Materials under Thermal Comfort Conditions

The Utilization of European Beech Wood (Fagus sylvatica L.) in Europe

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