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Article
Forestry
Pavlo Bekhta et al.
Summary: Ukrainian companies mainly use birch in plywood manufacturing, while black alder and other species are not widely used due to their poorer properties. This research aimed to evaluate the influences of different lay-up schemes on plywood properties by developing plywood panels with two wood species and two types of veneer treatments. The study showed that proper lay-up schemes, such as using black alder non-densified veneers in the core layers and birch densified veneers in the outer layers, can significantly improve the bending strength, modulus of elasticity, and shear strength of the plywood.
Review
Forestry
Juan A. Martin et al.
Summary: In recent years, the demand for wood has increased globally, but the production of woods with low natural durability is often insufficient to meet this demand. Wood-decay fungi are the main agents that deteriorate wood, followed by saproxylic beetles, termites, and marine molluscs and crustaceans. The natural durability of wood is determined by factors such as the composition of lignin, xylem anatomy, heartwood extractives, and moisture regulation components, which affect the resistance of wood to wood-destroying organisms.
Article
Polymer Science
Danilo Soares Galdino et al.
Summary: Using Kraft lignin, lignin-based phenol-formaldehyde (LPF) resins were synthesized as a potential replacement for petrochemical-based adhesives. The LPF resins showed improved properties compared to the control phenol-formaldehyde resin (PF) in terms of viscosity, gel time, shear strength, and curing behavior. However, the addition of EKL in PF reduced its thermal stability.
Article
Polymer Science
Dan Li et al.
Summary: In this experiment, the effects of different heat treatment pressures on the equilibrium moisture content, dimensional stability, mechanical properties, and chemical composition of bamboo were investigated. The results showed that the equilibrium moisture content of heat-treated bamboo decreases with increasing treatment pressure, while the dimensional stability increases. The optimal heat treatment pressure for bamboo is 0.1 MPa, which significantly improves the bending strength and longitudinal compressive strength compared to the control group. Various physical and chemical transformations were observed during the heat treatment process.
Article
Forestry
Aujchariya Chotikhun et al.
Summary: The study aimed to evaluate the properties of plywood made from thermally treated rubberwood veneers at different temperatures. Rotary-peeled veneers were treated at 160, 170, 180, and 190°C under 1 bar pressure. The plywood's dimensional stability and mechanical properties were assessed, showing improved stability and darkening with higher treatment temperatures. Plywood treated at 170°C and 180°C exhibited the highest strength, but beyond that temperature, the mechanical strength declined. Heat treatment at temperatures ranging from 160 to 180°C showed potential to enhance plywood properties.
JOURNAL OF WOOD SCIENCE
(2023)
Article
Forestry
Tao Ding et al.
Summary: Wood heat treatment is an effective method to improve the dimensional stability and biological durability of wood, although it may result in reduced mechanical properties. The study reveals that the heat-treated wood has a darkened, hydrophobic and rigid shell, while the inner core remains largely unchanged. The initial moisture content of the wood plays a crucial role in controlling the temperature difference between the core and the shell during treatment.
Article
Polymer Science
Yufa Gao et al.
Summary: Wooden structures are prone to shrinkage cracks due to wood moisture sensitivity. Understanding the shrinkage behavior is crucial in preventing failures caused by moisture-related shrinkage. Investigating wood dimension changes at different scales, such as in Masson pines, revealed higher shrinkage strain near the external face, leading to increased susceptibility to cracking. Anisotropic shrinkage was also observed, with different shrinkage ratios in the tangential and radial directions at both macroscopic and cellular levels.
Article
Materials Science, Multidisciplinary
Tomasz Krystofiak et al.
Summary: This study investigated the effects of heat treatment and vacuum heat treatment on the surface properties of wood, and found that different tree species showed varying changes in surface roughness after heat treatment. Additionally, the adhesion strength of the samples subjected to vacuum heat treatment had a better retention compared to those heat treated in air.
Article
Forestry
Estefani Sugahara et al.
Summary: This study compares the effects of different chemical treatments on the physical and mechanical properties of plywood. The results show that the treated plywood, especially the PU-based type, exhibits improved properties. Additionally, the CCA treatment enhances the modulus of elasticity and modulus of rupture of the adhesives used.
Article
Forestry
Jami Jarvinen et al.
Summary: Based on interviews with Finnish experts, this paper examined wood preservation practices and outlook in the context of climate change. The study revealed that pressure impregnated wood will continue to evolve and secure its market, and there is potential for developing modified wood products with a focus on recyclability and lifecycle concepts. The demand for highly processed surface treatment products is high, and there are opportunities for more sustainable and environmentally friendly wood preservation methods. The increasing mold problems in Finland due to climate change emphasize the importance of surface treatment. Fire protection treatments are also in demand, but product development is hindered by testing fees and processes. While the possibility of termite spread to Finland triggered by global warming is a future scenario, it should be considered in products exported to hot countries. Preservatives have become more critical in protecting untreated wood from climate change's adverse effects. It is believed that this study will contribute to the transition towards innovative and environmentally friendly wood treatments in the Finnish market and promote the use of wood in the building construction industry.
Article
Forestry
Bruno Santos Ferreira et al.
Summary: This study aimed to evaluate the effect of heat treatment on Pinus taeda plywood. The results showed that heat treatment reduced the roughness of the veneer's surface and altered the total extractives content. The specific gravity of the plywood initially increased with heat treatment, remained stable at higher temperatures, and the moisture content decreased. However, the thickness swelling of the plywood was not affected, and there was no change in its mechanical properties.
Review
Forestry
Zoltan Borcsok et al.
Summary: Lignin, cellulose, and hemicelluloses in wood are polymers bonded together in wood, with lignin having a highly branched, amorphous, three-dimensional structure. Lignin softening at around 100 degrees C plays a significant role in woodworking processes and understanding this process can lead to improvements in industrial processes.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2021)
Article
Construction & Building Technology
Yi-Hua Chen et al.
Summary: Castor oil is compared for its use as a polyol raw material with three kinds of isocyanate in this study, showing that increasing the NCO/OH molar ratio improves the water absorption and hard segment content of PU resins. Using Desmodur L and increasing the NCO/OH molar ratio are found to be optimal for enhancing the dimensional stability and internal bonding strength of the composites.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Mohammad Farajollah Pour et al.
Summary: The research investigates the effect of moisture content and microwave preheating on phenol-formaldehyde resin penetration and bonding quality of poplar laminated veneer lumber (LVL). Results show that increasing moisture content decreases the shear strength of LVLs while microwave preheating improves bonding properties. The study highlights the importance of penetration parameters on LVL's shear strength and delamination ratio.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Chemical
Anti Rohumaa et al.
Summary: This study found that the bond strength between different wood species in the veneer preparation process is not solely determined by the properties of the weakest wood material. Birch had the lowest surface roughness, while aspen exhibited the best wettability. Combining lower quality and density wood species with birch does not significantly decrease the bond quality.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2021)
Article
Biotechnology & Applied Microbiology
Amandine Leroy et al.
Summary: Hot water pretreatment (HWP) alters the composition and structure of biomass, increasing saccharification kinetics and yield. Changes in cell wall composition, lignin structure, and cellulose environment after HWP contribute to enhanced accessibility of cellulases and promote hydrolysis. Understanding the interactions between polymers is crucial for optimizing HWP in sustainable biorefineries.
BIOTECHNOLOGY FOR BIOFUELS
(2021)
Article
Forestry
Bruno Esteves et al.
Summary: The study aimed to investigate the potential use of heat-treated young Paulownia trees grown in Portugal to improve wood properties, showing an increase in extractive content, lignin, and alpha-cellulose, a decrease in hemicelluloses, improved dimensional stability but decreased mechanical properties. The resistance against termites was better for untreated wood possibly due to the thermal degradation of some toxic extractives.
Article
Polymer Science
Sebnem S. Arpaci et al.
Summary: This study investigated the natural weathering behavior of sixteen different wood species under the same conditions for a year, showing that the surfaces of pine, maple, and tulip samples experienced the darkest and greatest color changes, while walnut, A. walnut, and oak samples showed the least color changes. High-density wood species demonstrated more stability against color changes, while there was no significant correlation between density and roughness or gloss property changes.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Forestry
Demiao Chu et al.
Article
Construction & Building Technology
Pavlo Bekhta et al.
JOURNAL OF BUILDING ENGINEERING
(2020)
Article
Forestry
Pavlo Bekhta
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2020)
Article
Materials Science, Paper & Wood
AMÉLIA GUIMARÃES CARVALHO et al.
CELLULOSE CHEMISTRY AND TECHNOLOGY
(2020)
Article
Forestry
Viera Kucerova et al.
JOURNAL OF WOOD SCIENCE
(2019)
Article
Forestry
Marisabel Mecca et al.
WOOD SCIENCE AND TECHNOLOGY
(2019)
Article
Plant Sciences
Bruno Santos Ferreira et al.
Article
Construction & Building Technology
Pavlo Bekhta et al.
CONSTRUCTION AND BUILDING MATERIALS
(2018)
Article
Forestry
Minzhen Bao et al.
JOURNAL OF WOOD SCIENCE
(2018)
Review
Materials Science, Multidisciplinary
Christopher G. Hunt et al.
REVIEWS OF ADHESION AND ADHESIVES
(2018)
Article
Materials Science, Paper & Wood
Aleksandar Lovric et al.
Article
Materials Science, Paper & Wood
Bruno Santos Ferreira et al.
Article
Materials Science, Paper & Wood
Pavlo Bekhta et al.
WOOD MATERIAL SCIENCE & ENGINEERING
(2017)
Article
Forestry
Weiwei Shangguan et al.
JOURNAL OF WOOD SCIENCE
(2016)
