最新刊期
卷 39 ， 期 1 ， 2025
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摘要：China is the world’s largest manufacturer, consumer, and trader of wood-based materials and products. In response to the demands for high-quality products, the special forest project of National Key Research and Development Program of China (NKRDP) has coordinated and deployed innovative research tasks, established a project implementation mechanism with application scenarios and problem orientation as the goal, integrated the entire industry chain, gathered forces for original and leading scientific and technological research, broke through key core technologies, created major products, and carried out large-scale industrialization demonstrations in enterprises to ensure that project research results are accurately met with the industry’s needs. Through research projects, the technological innovation ability and comprehensive competitiveness of enterprises are enhanced, leading to the green and high-quality development of the wood processing industry and comprehensively improving the level of industrial modernization. This paper reviews the progresses in the wood and bamboo processing field under the NKRDP, analyzes the current technological level and development opportunities in China’s wood and bamboo processing industry, providing scientific support for the technological innovation and green transformation of the wood and bamboo processing industry, as well as reference and inspiration for the modernization development of the forest industry and the technological transformation and industrial upgrading in related fields.关键词：National Key Research and Development Program of China;special forest project;wood and bamboo processing technology;green transformation;intelligent manufacturing;efficient utilization of resources;industrial upgrading0|0|0更新时间：2025-03-26
GREEN MANUFACTURING OF WOOD-BASED MATERIALS
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摘要：The improvement of wood quality through modification techniques is one of the key strategies to alleviate the challenge of wood resource shortage. Among various wood modification methods, impregnation is particularly effective. This technique alters the structure of the wood cell wall and/or fills the cell lumen, thereby significantly enhancing the dimensional stability, durability, and mechanical properties of the wood. Additionally, it enhances functional characteristics such as fire retardancy and resistance to decay and insect infestation. Common modifiers include thermosetting resins, organic monomers, biomass-based modifiers, and organic-inorganic compound modifiers. The mechanisms by which these modifiers enhance dimensional stability primarily involve the swelling of the wood cell wall, the reduction of water absorption, and the prevention of water molecules from entering the wood, thereby improving resistance to shrinkage and swelling. Biomass-based modifiers such as furfuryl alcohol resins, small-molecule sugars, and lignin have attracted significant attention due to their environment-friendly and biodegradable properties. These modifiers not only enhance wood performance but also reduce the dependence on fossil resources. To further improve modification effectiveness, future research needs to focus on the synthesis of novel modifiers and the optimization of modification processes. Furthermore, leveraging artificial intelligence, it can be achieved to optimize the modification process, predict performance, and calibrate parameters.关键词：fast-growing wood;impregnation modification;dimensional stability;modification mechanism0|0|0更新时间：2025-03-26
REVIEWS
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摘要：A comparative study on the tensile creep behavior of earlywood (EW) and latewood (LW) obtained from the same growth ring of Masson pine (Pinus massoniana) was carried out at different temperature levels of hydrothermal treatment, to reveal the characteristics of the tensile creep behavior of water-saturated wood at the growth ring level. The tensile creep characteristics were then simulated using the Burger model for prediction. The results showed that EW was more prone to generate instantaneous elastic deformation and viscoelastic deformation than LW at each temperature level, regardless of tangential or longitudinal tension. The temperature ranging from 30 ℃ to 80 ℃ had no significant effect on the instantaneous elastic deformation of both EW and LW from Masson pine while the viscoelastic deformation and the plastic deformation heightened with the increasing temperature. The viscoelastic deformation of LW was more sensitive to temperature change than that of EW. The time required for the initial creep stage in LW was shorter than that in EW. The Burger model was approved to simulate the creep characteristic of water-saturated EW and LW under tangential and longitudinal tension, with a coefficient of determination (R2) of greater than 0.956.关键词：water-saturated wood;earlywood;latewood;temperature;instantaneous elastic deformation;viscoelastic deformation;Burger model0|0|0更新时间：2025-03-26 -
摘要：This study focuses on the standing trees of Quercus shumardii and Q. nigra, which were introduced from overseas. Growth cones were used to collect wood cores. The basic density and radial variation patterns were analyzed. Additionally, the Resistograph was employed to predict the basic density from different wood sections in Q. shumardii and Q. nigra. The findings revealed that the annual ring width of Q. shumardii and Q. nigra exhibited a decreasing trend from the pith to the bark, while the basic density increased in the same direction. The Resistograph effectively assessed the basic density of Q. shumardii and Q. nigra respectively. Notably, the accuracy of the fit was highest for wood located closest to the bark, with correlation coefficients of 0.821 and 0.743, respectively. This research provides a theoretical foundation for the efficient assessment of basic wood density in Q. shumardii and Q. nigra.关键词：Quercus shumardii;Q. nigra;basic density;Resistograph;fitting effect;growth ring width0|0|0更新时间：2025-03-26 -
摘要：Surface coating is an important method to increase the value and expand the application of wood products. The scientific research and product development on green waterborne wood coatings with self-repairing function is an effective way to achieve the protection of wood, enhance the quality, and increase the product values. Using tung oil as a raw material, bio-based waterborne polyurethane coatings are prepared through controlled synthesis and directional regulation of oil molecular functionalization to strengthen the surface coating of wood materials, heighten interfacial adhesion and increase integration of self-repair functions. The hydrophobic effect of the long carbon chain segment of tung oil fatty acids effectively reduces the molecular water sensitivity of the polyurethane system and improves the wet adhesion resistance of the coating; the oxidative cross-linking property of the conjugated double bonds of the side chains give the coating a good self-curing performance; and the use of boronated ester bond capping provides a dynamic response unit for the polyurethane network structure, which realizes the high efficiency of self-repairing of water-based coatings under the room temperature environment. The microscopic mechanism of the interaction between the coating and the wood surface is elucidated by systematically investigating the coating and its wood interfacial properties, including intrinsic mechanical strength, interfacial adhesion, and abrasion resistance. The results show that the prepared tung oil-based aqueous urethane emulsions have a stable and homogeneous dispersion characteristics; the absolute values of the zeta potentials are over 30 mV; when the nanocellulose additive content is introduced to 1.0% (mass fraction), the mechanical properties of the composite coatings (tensile strength, tensile strength, abrasion resistance, etc.) are effectively improved. When nanocellulose is introduced at 1.0%, the mechanical properties of the composite coating are improved (tensile strength of 9.3 MPa, modulus of 11.3 MPa, and fracture energy of 19.58 kJ/m2); the repair efficiency at the room temperature reaches 98.4% (taking fracture strain as a reference); the coating on the solid wood surface exhibits good adhesion and abrasion resistance. It exhibits a stable interfacial adhesion strength in a humid environment (RH=95%) with the lap shear strength of 7.1 MPa.关键词：tung oil;waterborne polyurethane;wood coating;self-healing;interfacial adhesion0|0|0更新时间：2025-03-26 -
摘要：The European spruce was selected to prepare cross laminated timber (CLT) by the vacuum pressure and balloon pressure. Firstly, under the conditions of adhesive application on the side of the laminated board, CLT samples were made under vacuum pressure of 0.1 MPa, and balloon pressures of 0.4, 0.6, and 0.8 MPa, respectively. The shear performance of the CLT adhesive layer were tested. Then, using the process of not applying glue to the side of the laminated board, CLT samples were made under balloon pressures of 0.8 MPa with the gap width of 2, 4, and 6 mm, respectively. The interlayer shear performance were evaluated. The damage types and dynamic evolution characteristics of CLT interlaminar shear were measured based on acoustic emission signal. The results showed that the pressure had significant effect on the adhesive layer shear strength and vacuum pressure impregnating of CLT. The failure modes of CLT adhesive layer shear mainly included shear failure near the adhesive layer, failure along the wood ray direction in the middle layer, and shear failure at the interface of early wood and late wood. The qualified rate of CLT room-temperature impregnating, boiling impregnating and vacuum pressure impregnating reached above 90% at the 0.8 MPa. The gap widths had a significant effect on the interlayer shear strength of CLT. When the gap widths of the surface layer and transverse layer increased from 0 mm to 6 mm, the interlaminar shear decreased by 43.7%, and the failure mode of transverse layer gradually transformed from rolling shear failure to laminate slip; the gap failure extended to the adhesive layer failure. In addition, the change of acoustic emission (AE) energy precisely reflected the damage evolution of CLT interlaminar shear. The AE energy signal was weak when the wood fiber bundle buckling and the tensile microcracks started to sprout in the deformation stage. In the crack propagation stage, the cumulative AE energy increased linearly, and the shear crack signals with high Risetime/Amplitude (RA) value and low Average Frequency(AF) value increased. In the failure stage, the AE energy appeared the linear mutation, and the ratio of shear crack signals with a high RA value and a low AF value reached 22.31%. The fracture form of CLT changed from tensile failure to tensile-shear compound failure.关键词：cross laminated timber;adhesive layer shear performance;interlaminar shear performance;acoustic emission (AE)0|0|0更新时间：2025-03-26 -
摘要：In this study, laminates with mechanical elastic modulus grades of ME9 and ME10 were selected to make glulam of different strength grades. According to T/CECS 1400—2023“Technical specification for log house building”, vertical compression joint specimens, three-point bending joint specimens, bending shear joint specimens, and bending joint specimens of log structure wall corner were designed and produced. The monotonous loading tests were carried out, the failure mode and load bearing performance of the joints were investigated under different mechanical modulus of elasticity and different loading conditions. The results showed that the load carrying capacity of the specimens made with ME9 laminates in the vertical compression, three-point bending, and bending shear condition were reduced by 20%~30% compared to the specimens made with ME10 laminates. In the tests of three-point bending, bending shear, and bending, the damaged specimen joints all showed brittle failure mode. The starting point of the damage cracks of the specimens mostly appeared in the slotted position of the joints. The position and depth of the joint slots had a certain effect on the bearing capacity of the joints.关键词：log structure;wall corner;glulam;load bearing performance;failure modes0|0|0更新时间：2025-03-26 -
摘要：In order to measure the content of azoxystrobin in treated wood precisely, a high performance liquid chromatography (HPLC) analysis method was constructed using a UV detector and C18 reversed-phase chromatography column, the V(methanol)∶V(water)=3∶1 as the mobile phase, with a flow rate of 0.8 mL/min and UV detection wavelength of 220 nm. Then, the ultrasonic extraction was used for pre-treatment of preservative extraction in wood/bamboo, and the extraction conditions were optimized. The results showed that the determination coefficient of the standard curve for azoxystrobin was 0.999 7 within the mass concentration range of 10~120 mg/L, and the linear correlation was significant. The coefficients of variation were 1.39% and 1.55%, and the recovery rates were 96.5%~101.6%. Under the optimized ultrasonic extraction conditions, including the solvent ratio of v(methanol)∶v(water)=8∶2, the extraction time of 60 minutes, and two retention levels, the azoxystrobin recovery rate of Radiata pine, masson pine, Chinese fir, and poplar‘107’was 95.5%~99.6%, with a standard deviation of 0.8%~3.8%. The recovery rates of Moso bamboo extraction were 84.4% and 88.3%, respectively. This method can be used to measure the azoxystrobin content in treated materials, with simple and fast pretreatment steps, achieving a high precision of analysis results and the good reproducibility.关键词：azoxystrobin;ultrasonic extraction;high performance liquid chromatography(HPLC);preservative-treated material0|0|0更新时间：2025-03-26 -
摘要：Wooden door products come in a wide variety of categories and involves intricate manufacturing processes, becoming significant challenges to numerous wooden door manufacturers. These manufacturers often grapple with escalating production costs, stagnant production efficiency, and dwindling profit margins. This study examined a door leaf's workshop in a customized wooden door furniture enterprise specializing in solid wood composite doors (hereinafter referred to as Enterprise H).Through comprehensive field investigation and analysis of the existing door leaf production model, and considering the enterprise's management and informatization needs, as well as factors such as enterprise development and return on investment, a digital door leaf production system was designed based on the current workshop status and existing issues. The system was debugged and operated for four months. The results indicate that the digital door leaf production system increased Enterprise H's monthly production capacity from an average of 5 856 units to 9 144 units, an increase of 56.15%. The production efficiency improved from an average of 6.42 to 11.91 units per person per day, an increase of 85.51%. The labor cost per door leaf decreased from 48.66 to 25.20 yuan, a decrease of 48.21%, and the qualified rate of one-time produce improved by nearly 5 percentage points. This system offers a robust solution for achieving transparency in the production process, augmenting efficiency, and ensuring timely order fulfillment in wooden door manufacturing workshops.关键词：wooden door;door leaf;MES;digital;production system0|0|0更新时间：2025-03-26
RESEARCH PAPERS
- 摘要：With the increasing attention to fire safety, it is crucially important to improve the performance of flame-retardant wood-based materials and products. The research and development in applications of flame-retardant products hold strong values. This article analyzes the current situation of China’s flame-retardant wood-based material and product industry, clarifies the major challenges in manufacturing technology, product quality, inspection methods, and other aspects of flame-retardant wood products in China. Suggestions are proposed from the aspects of technology development, standard specifications, policy supervision, etc., in order to enhance the high-quality development in China’s flame-retardant wood-based material and product industry.关键词：wood-based material;wood-based products;flame retardant;realization way0|0|0更新时间：2025-03-26
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