最新刊期
期 3 ， 2021
- 摘要：The authors briefly introduced the main characteristic of plant polyphenolic compounds, including the distribution in the wood structure, the interaction between the wood composition and plant polyphenolic compounds, and ionic bonding abilities between metal ionic and plant polyphenolic compounds. The influence of plant polyphenolic compounds on the wood properties were analyzed. The application and prospective trends of plant polyphenolic complex compound on the wood processing were summarized.关键词：plant polyphenolic compounds;metal complexation;Wood processing;application
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发布时间：2023-03-13 -
摘要：The requirements for the five most important parts of pianos (string, soundboard, bracket, keyboard and shell) made by wooden materials were summarized in terms of species, material quality, dimensions, acoustic characteristics. The production procedures of the wooden parts were also introduced according to the requirements of the piano manufacturing, including sawing, wood drying and equipment installation. The main issues and challenges of the piano manufacturing industry of China were analyzed, and the corresponding development suggestions were proposed. This paper provides a reference for the high-quality development of the domestic piano manufacturing industry.关键词：piano manufacture;wood materials;production and processing;development proposals- 92
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发布时间：2023-03-13 -
摘要：Efficiency and accuracy of detecting locations of wood defects are the prerequisite for mechanization and integration of wood processing. Using the convolutional neural network(CNN) to detect wood defects can not only increase the efficiency and accuracy comparing to manual detecting processes, but also save labor costs, as well as improve the intelligent level of the wood defect detection. In this paper, the theories and typical models of CNN were introduced; the application and research status of CNN in wood defect image segmentation, feature extraction, recognition and classification were summarized; and the development trends of CNN in the field of wood defect detection were proposed.关键词：convolutional neural network(CNN);wood defects;image processing;Deep learning- 65
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发布时间：2023-03-13
REVIEWS
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摘要：The panel furniture manufacturing has developed tremendously into mass production of customization. The current status of panel furniture manufactures were summarized and the stacking material system was analyzed. A three-dimensional coordinate system scheme was proposed. Combined with the hardware equipment and software system, a schematic structure of the system was established; and the sorting process was planned. The application of the system aims to improve the efficiency of palletizing, the utilization rate of pallets, and the utilization rate of shelf space in the three-dimensional warehouse under the flexible manufacturing mode.关键词：customized panel furniture;automation;flexible manufacturing;stacking plan;stacking process- 40
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发布时间：2023-03-13 -
摘要：The within-tree variation of wood chemical properties was evaluated for Acacia melanoxylon grown in China. The results showed that the longitudinal variation of the holocellulose (α cellulose and hemicellulose), acid-insoluble lignin, and extractive (cold water, hot water, 1% sodium hydroxide and benzene alcohol) contents was not significant. Compared with the sapwood, the heartwood contained slightly lower holocellulose (α cellulose and hemicellulose) contents, slightly higher acid-insoluble lignin contents, higher extractive contents, and a lower pH value. The effect of the proportion of heartwood and sapwood within the tree on chemical composition contents should be considered as a quality characteristic in the processing application of Acacia melanoxylon wood.关键词：Acacia melanoxylon;chemical property;longitudinal variation;heartwood;sapwood- 42
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发布时间：2023-03-13
SPECIAL REPORTS
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摘要：The corn straws produced in Heilongjiang province were used to prepare particles with six different geometries. The particle geometry and resin content were considered as two closely related variables for the comprehensive analysis to explore the manufacture process of corn straw particleboards aiming to have the excellent comprehensive performance. The experiment results showed with the 24~30# particles as the inner layer, and the 30~40# particle as the outer layers, a good comprehensive performance could be achieved, i.e., the MOR was up to 32.50 MPa, the MOE was 3.83 GPa, the IB was 0.93 MPa, and the 24 h thickness swelling was 14.21%, which met the requirement of the heavy-duty load bearing particleboard (P4 type) in the national standard of GB/T 4897—2015 Particleboard.关键词：corn straw particleboard;Particle geometry;resin content;dynamic thermomechanical analysis;physical and mechanical properties- 76
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发布时间：2023-03-13 -
摘要：The variation of micro-structural and chemical composition of normal and burl wood of Keteleeria evelyniana were studied through microscopic observation and FTIR spectra analysis. The design and application of fractal aesthetic pattern of burl were discussed. The results showed that the cell morphology of burl fibers of Keteleeria evelyniana were distorted; some tracheid and ray parenchyma cells of burl were enlarged. The chemical composition of burl wood changed significantly, but the growth of burled tree was not affected. The burl grain varied with high aesthetic values and distinctive decorative effects, which can be used for decorative design in furniture and handicrafts.关键词：keteleeria evelyniana;burl wood;micro-structure;chemical composition;pattern design and application- 25
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发布时间：2023-03-13 -
摘要：A laboratory-synthesized waterborne hyperbranched polyacrylate (HBPA) dispersed organo-montmorillonite (OMMT) emulsion with low molecular polyethene glycol 200 (PEG-200) was used as wood impregnating modifier to treat the sapwood of Cathy poplar (Populus cathayana Rehd.). The chemical structure and composition of the compound modifiers and the properties of modified wood were characterized. The water absorption, the volume swelling, the compression strength, and the flexural strength of the modified wood were tested. The results showed that the PEG-200 and HBPA were compatible, and the OMMT was exfoliated in the compound. After the impregnating process, some proportion of HBPA and OMMT entered into the wood cell walls, and the PEG-200 acted as a crosslinking agent among them. However, when the OMMT content was 4%, some OMMT filling was found in the wood cell lumen. Significant improvements on physical and mechanical properties of the modified wood were obtained, while the groups contained OMMT showed further improvements. There was no obvious improvement between the wood modified with a 2% OMMT content and the wood modified with a 4% OMMT content.关键词：Cathy poplar (Populus cathayana Rehd.);organo-montmorillonite;polyethene glycol;hyperbranched polyacrylate;chemical modification- 61
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发布时间：2023-03-13 -
摘要：Magnesium-aluminum hydrotalcite (LDH) is widely used, especially in the flame-retardant treatment because of its special structure, but as a single flame-retardant element limits its flame-retardant performance. In this study, polyvinyl alcohol phosphate(PPVA) was used to intercalate and modify the hydrotalcite to prepare an organic-inorganic composite synergistic flame-retardant agent. The poplar veneer was impregnated with the flame-retardant agent. The effect of the impregnation process on the chemical-loading and limiting oxygen index of poplar veneer was investigated. The results showed that PPVA effectively intercalated into the magnesia-aluminum hydrotalcite layer; the limiting oxygen index of treated veneer was 14.6% higher than that of untreated poplar veneer.关键词：hydrotalcite;polyvinyl alcohol phosphate;intercalation modification;flame retardant- 20
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发布时间：2023-03-13 -
摘要：To understand the effect of boiling treatment on the physical and mechanical properties of Moso bamboo, the influence of treatment duration (4, 8, 24, 48 h) on the mechanical properties, the swelling rate and the water absorption rate of bamboo were studied. The results showed that the mechanical properties of bamboo decreased with increasing treatment durations. The modulus of rupture(MOR) and the modulus of elasticity(MOE) of bamboo with a treatment of 48 h decreased by 40.24% and 43.65% respectively. The existing starch on the parenchyma cell wall blocked pits, possibly led to the reduction of the swelling rate and the water absorption rate after the bamboo was treated for 4 h. Therefore, the dimensional stability of bamboo was improved. However, the starch continued degrading, then, was removed gradually by the hot water, resulting the number of the blocked pits decreased. Meanwhile, the degree of degradation of the hemicellulose increased; and the link of β-O-4 in the lignin was destroyed. Therefore, the mechanical properties and the dimensional stability of the bamboo decreased if the treatment duration was longer than 4 h. The quality of the bamboo deteriorated accordingly.关键词：Moso Bamboo;boiling treatment;MOR;MOE;water absorption swelling rate;water absorption rate- 69
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发布时间：2023-03-13
RESEARCH PAPERS
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摘要：Thermosetting phenolic resin (NBR-PF) were modified by using nitrile rubber (NBR) as toughening agent and dimethyl carbonate (DMC) as curing agent respectively, which can be cured quickly at low temperature with excellent toughness. The results showed that the impact strength of resin reached 5.62 kJ/m2 when the amount of NBR was 6%. On this basis, when the amount of DMC was 5%~6%, the modified phenolic resin could achieve a shorter curing time (4.89~5.25 min) and a higher bonding strength (class II bonding strength 1.43~1.48 MPa) at 120 ℃.关键词：phenol formaldehyde resin;nitrile rubber;dimethyl carbonate;curing properties;impact strength;bonding strength- 51
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发布时间：2023-03-13 -
摘要：There have been a number of issues caused by the log axial displacement during the veneering peeling, such as blade jamming, log splitting, and/or equipment damage. The existing shaftless lathe machine was improved by installing the detecting and resetting devices. Considering the factors such as detecting efficiency, the rotary cutting position, and the resetting mechanism error, the installation position of the detecting device and the optimum resetting guide were determined; the detecting and resetting devices were designed to be interlocked with the rotary cutting machine to ensure that the reset mechanism is correct during the rotary cutting process. Data analysis and comparison were performed using the limit theory to verify the feasibility of the improved device. The log axial detection and reset were conducted by the new designed devices automatically within 3 s; the safety performance and work efficiency were improved significantly in the veneer peeling production line.关键词：spindle-less rotary lathe;axial movement;capacitive proximity switch;semi-embedded installation method;hydraulic push rod- 21
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发布时间：2023-03-13
APPLIED TECHNOLOGY
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摘要：The Chinese national standard of GB/T 18102—2020 "Laminate floor coverings", which was revised on the basis of GB/T 18102—2007, was issued on 14th December, 2020 and will be implemented on 1st July, 2021. This paper briefly introduces the revision procedures, principles, and the changes in the content of the new version of the standard. This work aims to provide guidance for interpretation and implementation of the standard, including normative references, terms and definitions, classifications, requirements, inspected methods, identification, packaging, transportation and storage.关键词：laminate floor coverings;national standard;revision;interpretation- 127
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发布时间：2023-03-13
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
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
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