最新刊期
期 2 ， 2023
- 摘要：With the continuous development of science, technology, the integration with big data and industry 4.0 in the furniture industry, China's panel furniture industry has undergone great revolutions in the exploitation of plate, designs of products and manufacturing process, manufacturing technologies, equipment development, and marketing strategies. This paper summarizes the advanced manufacturing technologies of the panel furniture industry in raw materials, special equipment, processing, and designing, etc. The development and application of advanced manufacturing technology of panel furniture in our country are analyzed, to promote the development of panel furniture industry.关键词：panel furniture;advanced manufacturing;plate;processing equipment;information;furniture design
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发布时间：2023-05-18 -
摘要：To improve the identification of complexed features of wood surface defects and detection efficiency, a detection model of wood surface defects based on YOLOv5s was proposed. First, the coordinate attention mechanism (CA) was introduced into the Backbone network to enhance the information interaction between each channel, then, the structure of hybrid spatial pyramid pooling-fast (HSPPF) was used to reduce information loss, next, the GSConv volume was used to reduce the number of parameters, and the modified curve efficient intersection over union (CEIoU) was used as the loss function of the model during training to improve the accuracy of wood defect detection. The experimental results show that the improved model can detect wood surface defects effectively. The mean average precision (mAP) of the model was 84.4%, which was 2% higher than unimproved methods, and the detection speed reaches 73.9 FPS. It is also superior to other mainstream models, and achieves a significant reduction in the number of model parameters, which can meet the requirements of wood surface defect detection.关键词：HS-YOLOv5s;wood surface defect detection;coordinate attention(CA);hybrid spatial pyramid pooling-fast(HSPPE);curve efficient intersection over union(CEIoU)- 82
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发布时间：2023-05-18
REVIEWS
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摘要：In this study, the microstructure and lignification of axial tracheid and ray cells during xylem differentiation of Pinus bungeana were investigated using optical microscopy, polarizing microscope, and scanning electron microscope combined with histochemical staining of cell walls. The results of tissue maceration and morphological analysis showed that the length of axial tracheids was stable after the cell expanded during xylem differentiation. The cell wall thickness of ray tracheids increased with xylem differentiation, while the cell wall thickness of ray parenchyma cells remained the same in the current-year xylem. The results of lignin autofluorescence and lignin-specific staining showed that the lignification process of axial tracheids began in the middle lamella and cell corner during the thickening of the S1 layer. The lignification process of ray tracheids was similar to that of axial tracheids, but the ray parenchyma cells did not lignify in the current-year xylem. During xylem differentiation, the processes of cell wall thickening and lignification in tracheids (axial tracheids and ray tracheids) and ray parenchyma cells were significantly different.关键词：Wood anatomy;axial tracheid;ray tracheid;ray parenchyma;cell wall;lignification;xylem differentiation- 161
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发布时间：2023-05-18 -
摘要：To investigate the effects of different temperatures on the color and dimensional stability of three tropical hardwoods, the heat treatments were conducted at 160, 180, and 200 °C on Pterocarpus macrocarpus, Dalbergia oliveri, and Baphia nitida, respectively. The results showed that the mass loss of all three hardwoods increased, and the color gradually darkened with increasing heat treatment temperature. Among them, the color of Pterocarpus macrocarpus and Baphia nitida after heat treatment was affected more substantially than Dalbergia oliveri. In addition, as the temperature increased, the moisture adsorption and swelling coefficient of wood samples decreased, the moisture excluding efficiency and anti-swelling efficiency increased, and the dimensional stability significantly improved at both low humidity (25 ℃, 30% RH) and high humidity (40 ℃, 90% RH) conditions respectively. Additionally, significant mass loss and color changes were observed after the heat treatment at 200 °C. Therefore, the optimum heat treatment process is 180 ℃ for 3 h.关键词：high-temperature heat treatment;tropical hardwoods;color change;dimensional stability- 93
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发布时间：2023-05-18 -
摘要：The lateral force resistance of light-wood-framed shear wall under a large horizontal lateral load is often weakened by uplifting a stud. Based on this phenomenon, this study proposed a connection method to strengthen the shear walls, where the side studs and bottom plates were connected with tapping screws. The enhanced light-wood-framed shear walls with tapping screws and the traditional light-wood-framed shear walls were tested under monotonic loads, respectively. The effects of different skeleton fastener types, the diameters, and lengths of the tapping screws on the lateral performance of the shear walls above were studied. Experiment results showed that when the tapping screw enhanced light-wood-framed shear walls were damaged, the side studs occurred a bit bending and little uplift, the damage between the sheathing panel and skeleton was relatively light. Compared with the traditional light-wood-framed shear walls, the shear strength of the tapping screw enhanced light-wood-framed shear walls was increased by 16%~33%, the elastic lateral stiffness was increased by 27%~111%, the ductility coefficient was increased by 1.7%~31.7%, and the energy consumption was increased by 2%~18.8%. It improves the lateral performance of the shear walls effectively by connecting the side studs to the bottom plates with the tapping screws.关键词：light-wood-framed shear wall;lateral performance;tapping screw- 26
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发布时间：2023-05-18 -
摘要：Compared with the vertical multi-layer hot press, the horizontal multi-layer hot press has achieved a new breakthrough in production capacity and is more suitable for the development of plywood industry. This paper takes 80 layers of 4′×8′ horizontal multi-layer hot press as the research object and determines the load condition of the frame in the closed pressure maintaining stage based on the plywood hot pressing process and the structural characteristics of the horizontal multi-layer hot press in order to study the influence of thermal-mechanical coupling effect on the mechanical properties of the horizontal multi-layer hot press. To analyze the frame state under the influence of force load and thermal-mechanical coupling effect, finite element analysis methods is used. The results show that the stress and deformation of the frame increase significantly under the action of thermal-mechanical coupling effect, and the frame cannot meet the strength and stiffness requirements of the horizontal multi-layer hot press in the closed pressure maintaining stage under the actual working condition. The frame structure is improved based on the above analysis results, and it is verified that the improved frame structure meets the design requirements, which provides a new design idea and means for the improvement design of the horizontal multi-layer hot press frame structure, and has practical engineering application value.关键词：horizontal multi-layer hot press;frame;finite element analyses;thermal-mechanical coupling analysis;improve design- 38
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发布时间：2023-05-18 -
摘要：Through traditional surveys and modern non-destructive testing technology, the material quality of each component in the wood structure of the Ruyu Pavilion in Suzhou Cultivation Garden was evaluated. An three-dimension finite element model of the whole wood structure of Ruyu Pavilion was established. The results show that the wood species used in the wooden structure of Ruyu Pavilion are mainly spruce and Chinese fir. Only a small number of wood components in the wood structure of Ruyu Pavilion have cracking and decay problems, mainly in the areas prone to dampness at the bottom of the column. The design value is considered according to the strength grade TC11-A in the national standard GB 50005—2017 Standard for design of timber structures. The actual service life, the use environment, and other conditions are also considered. Finally, the finite element analysis shows that the vertical load of the wooden structure of Ruyu Pavilion is mainly borne by four corner columns. The bearing performance of the overall structure meets the ultimate state requirements of bearing capacity. This paper provides basic data support for the subsequent repair and reinforcement treatment for Ruyu Pavilion.关键词：Ruyu Pavilion;wood structure;safety analysis;wood species;wood status;three-dimension finite element model;strength grade- 38
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发布时间：2023-05-18 -
摘要：In this study, a catechin biological-functional material was selected as the antibacterial and antiviral additive to mix with a waterborne-UV wood coating (labeled as AWU coating). The antibacterial and antiviral environment-friendly wood coating made in the laboratory was compared with the waterborne-UV coatings without the additives (labeled as WU coating). The advantages of the catechin modified waterborne-UV wood coatings were explored in aspects of antibacterial, antiviral, and physicochemical properties of the film. The results showed that the antibacterial rate and antiviral activity rate of the AWU film were greater than 99.99%, indicating a high antibacterial and antiviral efficiency. The addition of antibacterial and antiviral additives did not affect the micromorphology of the film. Furthermore, antibacterial and antiviral additives improved the hardness and glossiness of the film, and greatly optimized the chromaticity of the wood surface. This study provides a theoretical basis for the development and application of antibacterial and antiviral wood coatings.关键词：catechin modified waterborne-UV coatings;antibacterial;antiviral;physicochemical properties of coatings- 85
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发布时间：2023-05-18 -
摘要：UV detector and C18 reversed-phase column were used for detection. The chromatographic conditions for analysis of kresoxim-methyl were as follows: flow phase methanol-water ratio of 85∶15, the flow rate of 0.8 mL/min, UV detection wavelength of 220 nm. There was a good linear relationship between kresoxim-methyl concentration and chromatographic peak area in the range of 5~100 mg/L, with a determination coefficient of 0.9997. The coefficient of variation and recovery of samples were 0.55% and 99.6%~101.5%, respectively. The results of the leaching test showed that when the concentrations were 0.04%, 0.08%, and 0.16%, the leaching rate of kresoxim-methyl from Masson pine and Chinese fir were 4.7%~7.5% and 3.2%~6.9%, which were significantly lower than those of treated poplar‘107’(11.5%~18.4%). The leaching rate of kresoxim-methyl in the treated Masson pine, Chinese fir and poplar‘107’were all below 20%, the leaching resistance were excellent. The leaching rate of the treated wood with ethanol-dissolved kresoxim-methyl was higher than that of the water-based formulation, therefore the water-based formulation of pyraclostrobin was suitable in outdoor applications of treated wood and wood products.关键词：kresoxim-methyl;high performance liquid chromatography(HPLC);treated wood;leaching resistance- 54
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发布时间：2023-05-18
RESEARCH PAPERS
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摘要：The application of numerical control technology is the key to realizing intelligent manufacturing of furniture, which promotes the development of the Chinese manufacturing industry. In this paper, the composition, characteristics, and developing process of numerical control technology was explained. Meanwhile, considering the panel furniture manufacture as an example, it was emphasized on the application status of numerical control technology applied in the material sawing, edge banding, drilling processes. The strategies for the furniture manufacturing industry were put forward such as developing adaptive numerical control application program, developing diversified technology, building numerical control platform and so on.关键词：numerical control technology;woodworking machines;Furniture manufacturing;development trend- 66
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发布时间：2023-05-18 -
摘要：The requirements for the main parts of violin (head, neck, resonator, bow and accessories) are summarized in terms of wood species, structure, acoustic characteristics and dimensions. The processing quality of the wooden parts for violin manufacturing are also concluded from material preparation, to wood drying and equipment processing accuracy. The main issues facing the violin manufacturing industry in China include the low quality of wood materials, insufficient application of scientific methods and analytical equipment, the outdated technologies for optimizing wood materials and the shortage of technical professionals. In response to existing problems, suggestions are proposed such as promoting the cultivating domestic high-quality resources, researching scientific evaluation methods, strengthening the development of wood modification technology and talent reserves.关键词：violin manufacture;wood;acoustic properties;production and processing;development proposals- 75
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发布时间：2023-05-18
DISCUSSION ＆SUGGESTION
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摘要：Establishing a scientific and reasonable standard system of carbon dioxide emission peaking and carbon neutrality (“double carbon”) for China’s wood industry is not only an important measure to implement the national standardization development outline but also a blueprint for the standardization work of double carbon. At present, the construction of the standard system on double carbon for China’s wood industry is still in the early stage, while there is lack of top-level design and system planning. In this paper, we first summarize the principle and basis of the standard system of double carbon for China’s wood industry. Subsequently, we propose the realization path of industrial double carbon goals. Therefore, the standard system framework is constructed, which includes four sub-systems, namely, basics and synthetic sub-systems, synergistic emission reduction sub-systems, carbon emission reduction sub-systems, and carbon neutrality sub-systems. Finally, four suggestions to promote the standard system of double carbon for China’s wood industry are put forward. The standard system will provide an important means to assist the achievement of industrial double carbon goals.关键词：wood industry;carbon dioxide emission peaking;carbon neutrality;standard system- 210
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发布时间：2023-05-18
DISCUSSION ON STANDARDS
- Address：Box 29，Research Institute of Wood Industry, No. 1, Dongxiaofu, Haidian District, Beijing Postal code：100091
- Tel：010-62889419 Email：mckx@caf.ac.cn
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