最新刊期
期 3 ， 2022
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摘要：As a green renewable material, wood is widely applied in many fields such as indoor & outdoor decoration and structure construction. In order to solve the problem of aging and reducing service life caused by long-term exposure in light, the importance of constructing UV-resistant coatings on the surface of wood is elaborated. New requirements for high efficiency and high environmental tolerance are considered for the nano-UV-resistant coatings. In this review, we mainly introduced the research progress of nano metal oxides, layered double hydroxides and bio-derived melanin particles as the UV shielding agents. With respect to the poor dispersion stability and easy agglomeration of nanoparticles, the core-shell design, host-guest assembly and other structural design strategies were briefly introduced. The application of nano-UV-resistant coatings in wood anti-photodegradation were also summarized, which will promote the development progress in the research field of nano-UV-resistant coatings for green and efficient wood materials.关键词：wood photodegradation;anti-ultraviolet agents;nano metal oxides;melanin;layered double hydroxides- 167
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发布时间：2022-06-20 -
摘要：The paper-based decorative materials are commonly used as surface decorative materials for wood-based panels. It can not only furnish the surface of wood-based panels with patterns and colors, but also can protect the surface. In this paper, the development status, classification, application, and feature of paper-based decorative materials are summarized. The new techniques applied on paper-based decorative materials are also mentioned.关键词：paper-based decorative materials;wood-based panel;surface decoration;new technique- 111
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发布时间：2022-06-20 -
摘要：The literatures on negative Poisson’s ratio (NPR) materials and structures were reviewed. The forms and current application trends of NPR metamaterials were summarized. The effects of NPR structure in enhancing the overall mechanical properties of furniture and mechanical properties of parts and joints were analyzed. Considering the trend and demand of furniture design, NPR materials and structures can be further developed by 3D printing technology and finite element method.关键词：negative Poisson’s ratio structure;furniture;mechanical property enhancement- 81
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发布时间：2022-06-20
REVIEWS
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摘要：In order to improve the equipment management efficiency for the customized furnishing manufactures, total productive maintenance (TPM) system was adopted. The theory of TPM and the current status of equipment management for the customized furnishing manufactures was analyzed. The preparation process and implementation of TPM activities in customized furnishings manufacturers was designed. The establishment of TPM system and the analysis of overall equipment effectiveness (OEE) can improve management methods, equipment utilization, and production efficiency.关键词：customized furnishings;equipment management;total productive maintenance;overall equipment effectiveness- 64
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发布时间：2022-06-20 -
摘要：To improve the overall equipment efficiency (OEE) in furniture manufacturing, the key equipment of edge banding machine in the production line was selected as the research object. Based on the OEE concept and calculation method, the production data of edge banding machines were collected and sorted to evaluate the maintenance level. The results showed that the main factors, which restricted production efficiency were the fault shutdown, machine replacement and adjustment, and temporary shutdown. It was proposed that the production efficiency can be improved from the following perspectives: to increase employee' awareness, to advance employee's skills of equipment maintenance, to establish part replacement schedule on a regular basis, to enhance spare part management, to set up special improvement teams, and to formulate corresponding standard guidance documents. This paper provides basic guideline for improving the comprehensive efficiency of panel furniture edge banding machine, and serves as references for improving the whole line efficiency of panel furniture production.关键词：equipment management;overall equipment efficiency (OEE);equipment performance analysis;panel furniture;banding machine- 69
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发布时间：2022-06-20
RESEARCH ON PLANNING AND MANAGEMENT FOR HOME FURNISHING DIGITAL WORKSHOP
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摘要：The application of soy protein adhesives in particleboard manufacturing has some challenges, such as high viscosity, inability to spray glue, low solid content, and poor water resistance. To solve the above problems, in this project the viscosity of the adhesive was reduced, and the solid content of the soy protein adhesive was increased through destroying the molecular structure of soy protein and the intermolecular force to meet the requirements of the particleboard production process. The epoxy crosslinked with the soy protein forming a network to improve the water resistance of the adhesive and the mechanical properties of the particleboard. The solid content of modified soy protein adhesive increased to 30.95%, which was 31.9% higher than that of unmodified soy protein adhesive. The viscosity was reduced to 35 s (coating-4 cup, 25 °C), while the viscosity was less than 60 s after 240-h (coating-4 cup, 25 °C) storage, so that the spray sizing was achieved. The laboratory-made particleboards had good preloading performance, which solved the problems of low solid content, high viscosity, and inability of spraying glue of the soy protein adhesive. The results showed the low viscosity soy protein adhesive could replace the surface layer isocyanate adhesive to prepare low-cost formaldehyde-free particleboard products. When 19.8% modified soy protein adhesive was added to the surface layer of shavings, 2.6% modified soy protein adhesive and 1.7% isocyanate were added to the core layer of shavings, the particleboard sample with a density of 654 kg/m3 was prepared, and its the physical and mechanical properties including 2-h water absorption thickness expansion rate (2.20%), the static flexural strength (12.16 MPa), the elastic modulus (2 163 MPa), the internal bonding strength (0.53 MPa) and the surface bonding strength (0.85 MPa), met the specifications of P2 type according to National Standard GB/T 4897—2015 for particleboard.关键词：soy protein adhesive;particleboard;viscosity;solid content;mechanical properties- 100
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发布时间：2022-06-20 -
摘要：In this study, high-density fiberboards were made of poplar fiber and isocyanate resin. The effect of resin content on the properties of fiberboards was explored. The results showed that the mechanical properties and water resistance of fiberboards gradually increase with increasing of the resin content from 3% to 10%. When the resin content ration reached 10%, the performance of fiberboard exhibited the optimum performances. Moreover, with the further increase of the resin content, the mechanical properties and water resistance of the fiberboards decreased gradually. Because the isocyanate group can react with the water in the fiberboard, then release CO2 during high-temperature curing, it was easy to produce lots of bubbles in the fiberboards, thus reducing the strength of physical and mechanical properties. When the resin content of MDI was 3%, the physical and mechanical properties of the high-density fiberboard met the requirements for general purpose high-density fiberboard in GB/T 31765—2015 "High Density Fiberboard "; the resin content of MDI was 6%, the physical and mechanical properties of high-density fiberboard were better than the performance requirements for high-humid high-density fiberboard in GB/T 31765—2015. It was recommended to select a suitable content of resin according to the application of the isocyanate glue high-density fiberboard.关键词：high-density fiberboard;isocyanate resin;resin content;mechanical properties;water resistance- 123
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发布时间：2022-06-20 -
Effect of Polydopamine-Modified Nano-Boron Carbide on Properties of Waterborne Polyurethane Coatings
摘要：Polydopamine (PDA) produced by self-polymerization of dopamine (DA) at room temperature was used to modify nano-boron carbide in order to produce polydopamine-modified nano-boron carbide (B4C-PDA) coatings. The waterborne polyurethane coating was successfully modified by adding B4C-PDA. When 1% of B4C-PDA content was added, the mechanical properties of the coating were best, and the abrasion was reduced by 96.2% to a minimum of 0.0058 g/100 r. At this condition, the modified coating had the best abrasion performance and level-1 adhesion property, as well as the hardness of 2H. The thermogravitic mass retention rate of the coating increased from 4.20% to 7.97%. It was proved that the composite waterborne polyurethane coating modified by boron carbide dispersion had good mechanical properties and thermal stability.关键词：nano boron carbide;polydopamine;abrasion performance;waterborne polyurethane coating- 58
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发布时间：2022-06-20 -
摘要：In order to reduce the peculiar smell of the wood-based panels, various contents (with ratios of 0.25%, 0.50%, 0.75%, 1.00%) of aromatic compound were added into the formaldehyde-free adhesive to prepare the formaldehyde-free decorative paper, which endowed the decorative paper with fragrance. The effects of different aromatic contents on the slow-release performance and surface properties of the formaldehyde-free decorative paper surfaced wood-based panels were investigated. The chemical composition of impregnated resin and the surface morphologies of decorative paper were tested and characterized by the Fourier infrared spectroscopy (FTIR) and electron scanning microscope (SEM). The results showed that the aromatic sustained-release performance of formaldehyde-free decorative paper veneer wood-based panels was fairly good. The fragrance released from the testing panels has been detected after 90 days at the room temperature. The aromatic compound was compatible with the adhesive. It did not affect the properties of the impregnated adhesive. The formaldehyde-free decorative paper adhesive film had a moderate sealing effect on aromatic particles, which contributed to the slow-release of fragrance. At the same time, the properties of the surface bonding strength, surface resistance to water vapor, and surface anti-pollution (acetone) of the decorative surfaced panels met the requirements of the standard GB/T 15102—2017 of "Surface Decorated Fiberboard and Particleboard with Paper Impregnated Thermosetting Reins".关键词：formaldehyde-free adhesive;decorative paper;fragrance releasing;surface decorated wood-based panels- 147
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发布时间：2022-06-20 -
摘要：To analyze the stress-strain law and shrinkage difference during the drying process, the strain profile of 20 mm thick Quercus mongolica lumber along the width and thickness directions was monitored respectively by the digital image correlation (DIC) technique. This research analyzed the difference of drying strains in width and thickness directions and the effect of the temperature. The results indicated that the DIC was an effective non-contacted method of detecting the drying strain in wood. The DIC can visualize the drying deformation process while the results obtained by DIC was consistent with those of traditional detection methods. Meanwhile, under the condition of the same moisture content, the strain of each layer along the thickness and width directions increased progressively as the temperature increased. At the temperature of 80 °C, the difference of strain between the middle position and both sides were 0.059; whereas at the temperature of 40 °C, the difference decreased to 0.042. The strain values and trends along the thickness direction of Quercus mongolica lumber were similar with those along the width direction. The wood shrinkage anisotropy was mainly derived from the width direction. Meanwhile, the value of wood shrinkage anisotropy was greater at 40 ℃ than at 80 ℃.关键词：Drying strain;digital image correlation(DIC) techniques;moisture content distribution- 48
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发布时间：2022-06-20 -
摘要：In order to enhance color homogeneity and atmospheric stability of larch wood, the thermal treatment process was applied to the larch wood firstly. Then the thermal treated larch samples were infiltrated in the plant oil-wax at 200 ℃. The color difference between heartwood and sapwood was investigated by the self-set image colorimetry. It was found that under the same thermal treatment, the lightness index L* and yellow-blue index b* of heartwood and sapwood decreased visibly after the plant oil-wax infiltration. The color homogeneity of larch wood was improved under the different thermal treatments and plant oil-wax infiltration process. The larch wood showed better atmospheric stability after the thermal treatment and plant oil-wax infiltration process.关键词：larch;thermal treatment;plant oil-wax infiltration;color homogeneity;atmospheric stability- 53
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发布时间：2022-06-20 -
摘要：Xiaozhang Biyun Temple which is located in the Southeast area of Shanxi province is an precious ancient building with the cultural relics value. However, several issues such as the construction age, still need to be further studied. In the paper, the information and data from field investigations and laboratory tests were analyzed using the methods of phytology, material and chronology. The wood-selection rule and damage distribution in wood members of the main hall were generally concluded. The construction history was also clarified. The results are useful to understand the wood-selection principles and construction technology of ancient buildings in the Southeast area of Shanxi province. It also provides scientific reference to guide the prevention and protection in ancient buildings.关键词：Xiaozhang Biyun temple;wood member;field investigation;disease;construction and restoration history- 62
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发布时间：2022-06-20 -
摘要：A steel-Cross Laminated Timber (CLT) composite beam connected with studs embedded in grout pockets was designed. The effects of the stud diameter, pocket spacing, and stud arrangement on the flexural performance and anti-slip performance of the steel-CLT composite beams were investigated based on ABAQUS. The theoretical prediction of the flexural load capacity and flexural stiffness of the composite beams was conducted by combining with the basic theory of the composite structure. The results showed that the numerically obtained load-mid-span deflection curves were characterized by two-well defined linear parts with an distinct yield point. The simulated load-mid-span deflection curves were close to the boundary line for the full composite action in the initial stage indicating a high composite efficiency for the composite beams with studs embedded in grout pockets connection. The coefficient of the composite efficiency of studs embedded in grout pockets connected steel-CLT composite beams was between 0.80 and 0.97 on average. The stud diameter and pocket spacing are important parameters which affect the overall performance of the steel-CLT composite beam connected by studs embedded in grout pockets.关键词：steel-CLT composite beam;stud connection;flexural behavior;anti-slip performance- 52
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发布时间：2022-06-20 -
摘要：It is necessary to evaluate the reliability and safety of the load-bearing timber structures before to proceed the maintenance and intervention. In order to investigate the internal decay state of the timber members of ancient buildings in Beiqian village, Daixi town, Pingnan county, Fujian Province, a stress wave detector was used to assess the wooden beams. The stress wave velocity of the wooden beams was processed by using the interpolation method of Surfer software. The results showed that almost all load-bearing wooden beams have various defects of decay. The internal decay of the upper section was significantly smaller than that of the lower section. The predicted results were in the good agreement with the actual health condition of the wooden beams. Non-destructive testing method was transformed from the qualitative research to the quantitative research by using Surfer software processing the stress wave velocity and providing visualization prediction of internal decay of different cross-sections of wooden beams.关键词：stress wave;wooden beams;nondestructive testing;decay- 45
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发布时间：2022-06-20 - 摘要：The characteristics of wood insects and identification methods for ancient timber buildings were analyzed. The prevention measures of wood insects were proposed. The species of the wood components in 11 timber structures, which were affected by insects are hardwood pine (Pinus spp.), spruce (Picea spp.), Phoebe spp., and softwood pine (Pinus spp.). According to the sizes and shapes of the insect holes, as well as the appearance of the damaged components, the type of insects can be preliminarily determined. Further analyses on the damage characteristics and residual debris inside the components, using microscopic observation and specimen comparison, provide accurate assessment of the insect type. Most of the small wormholes in the ancient timber buildings were caused by Lyctidae, Bostrychidae, and Anobiidae. One or two wormholes in a wooden component had little effect on the structure and strength. The circular wormholes with 10 mm in diameter were mostly formed by Xylocopidae, which were often found in the rafters of ancient timber buildings. The other kind of larger pores with more than 5 mm in diameter were the eclosion pores or fecal pores of Cerambycidae, which appeared mostly in columns, beams, and other locations. The Termitidae was different from the three types of insects above. The debris of Termitidae was mixed with soil. The infested state by Termitidae, which mostly occured in the buried wall components, had typical damage characteristics. The insect prevention methods need to consider the biological characteristics of the insects in order to determine the vulnerable period, then make targeted measures accordingly.关键词：ancient timber structure;wood component;wood borers identification;prevention
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发布时间：2022-06-20
RESEARCH PAPERS
- 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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