最新刊期
期 0 ， 2020
- 摘要：Wood is the only renewable material among the four most important widely-used construction materials: steel,cement,wood,and plastic. The embodied energy and in-use energy efficiency of wood products are far lower than that required for steel,aluminum,and concrete products. All wood products provide long term sustainable carbon sequestration to mitigate global climate change. Building a competitive bio-based wood industry through sustainable forest management will play an important role in developing a low-carbon economy,increasing job opportunities,and promoting sustainable development.关键词：wood;Utilization;low carbon economy;climate change
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发布时间：2021-02-08
Forward
- 摘要：An experimental investigation was conducted in this study to optimize the process of manufacturing dimension lumber with live-sawing and cant-sawing methods. Effects of log diameter and grading on lumber grade recovery were analyzed. The results showed both log grade and diameter,along with sawing methods,significantly affected the quality and grade of the produced dimension lumber. We found that the log grade needed to be No.2 or above and the diameter should be 2628 cm or higher to assure high lumber grade and yield recovery.关键词：larch;dimension lumber;log grade;diameter;recovery
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发布时间：2021-02-08 - 摘要：This study was performed to evaluate the mildew resistance of heat-treated lumber. Dinitrosalicylic acid was used to estimate the sugar content in heat-treated birch and Mongolian pine samples. The results showed that heat-treated lumber was more susceptible to mold growth than their untreated control samples. Furthermore,the outside layers of the heat-treated samples were more prone to mold growth than the inside layers. No mold growth was observed on the surfaces coated with varnish. The sugar content of heat-treated samples increased with higher treatment temperature and the sugar content of the outside layers was usually higher than the core.关键词：heat-treated lumber;mildew resistance;DNS
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发布时间：2021-02-08
- 摘要：Birch veneers impregnated with melamine-formaldehyde resin （MF） were used to make reconstituted lumber. Two hot pressing methods,high-frequency and traditional hot-platen,were used and their influences on the density distribution of reconstituted birch lumber was analyzed. The results showed different heat transfer due to the different hot pressing methods and had considerable impact on the density distribution in the length,width and the thickness directions. Thus,when producing reconstituted lumber with thickness above 30 mm,we recommend using a high frequency hot-pressing method to maintain a uniform density distribution.关键词：birch reconstituted lumber;high-frequency hot pressing;traditional hot pressing;density distribution
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发布时间：2021-02-08 - 摘要：This paper studied the process of preparing nano-TiO2 slurry and use the slurry to modify waterborne polyacrylate wood coating to improve their anti-ultraviolet performance. The effects of the processing nano-TiO2 slurry and the content of nano-TiO2 varnish on anti-ultraviolet performance were discussed. The coating films didn’t change their transparence and also showed good anti-ultraviolet resistance for both the dyed veneers and un-dyed veneers when nano-TiO2 content reached 1.5%.The nano-TiO2 modified films were better than commonly-used additive films which could change the chromatism by 1/3 to 2/5.关键词：Nano-TiO2;waterborne wood coating;light color fastness;light-induced discoloration;veneer
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- 349
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- 18
发布时间：2021-02-08
Research & Development
- 摘要：After the impact of world financial crises the economy in China is on the way of V shaped recovery. With increasing of economic growth rate,business confidence,domestic demand and export,the demand for wood based panel and other wood related products is steadily growing. This demonstrates the huge potential of the investment market. Large amount of Private Equity capital has started a new round of investment into the wood-based panel industry and speeded up the industry and market consolidation. The study discusses how the wood product industry to face the challenges to the changing economic environments.关键词：wood-based panel;market potential;Private Equity Investments;opportunity
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- 887
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- 35
发布时间：2021-02-08
Expert Forum
- 摘要：Light frame housing,one of the most popular wood structures in North America,Europe,and Japan,has increased its presence in the Chinese housing market in recent years. Based on the practice of light frame housing construction,this article illustrated three major modules （wood frame processing,frame construction,and wall assemblies） for prefabricating housing components. A detailed processing layout in each module was presented.关键词：wood structure;construction wood parts;CNC processing station;machine layout
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发布时间：2021-02-08 - 摘要：A preliminary framework for a new timber standard system for China is proposed in this study. The framework is composed of bottom and top sections. The bottom section focuses on log and sawn lumber,wood processing technology,semi-manufactures of timber,and wood structure. The top section concentrates on general standards,product performance and specifications. The authors also presented the status of China’s current timber standard system to provide reference for the establishment and improvement of a new Chinese timber standard system.关键词：wood;standard;system
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发布时间：2021-02-08 - 摘要：Three prefabricated bamboo-wood compound walls 50 mm in thickness with different configurations were manufactured in this study. Their heat and sound insulation properties were tested and analyzed. The results showed that the hollow compound wall exhibited the worst thermal and acoustic insulation properties. However,the insulation performance could be improved considerably by filling rock wool inside the walls. It was also noticed that there was no significant difference on heat and sound insulations between the fire resistant gypsum board and bamboo plywood as inner wall sheathing.关键词：prefabricated;bamboo-wood compound wall;heat insulation;sound insulation
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- 292
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- 10
发布时间：2021-02-08
Discussion & Suggestion
- 摘要：A series of radio frequency/vacuum （RF/V） drying tests were conducted on boxed-heart timbers of plantation larch. Various RF/V conditions were analyzed to optimize the drying quality and drying speed. We found that the optimized RF/V parameters were: 0.4 A input current,2 kV electrode voltage,50 ℃ temperature,3 minutes oscillation circle then 1 minute for stopping;and 13.33 kPa vacuum pressure at the early drying stage and 6.67 kPa at the final stage.关键词：Radio frequency/vacuum （RF/V） drying;boxed-heart timber of larch;drying quality;Drying techniques
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发布时间：2021-02-08 - 摘要：Polyferric sulfate（PFS）was selected as a coagulant and polyacrylamide（PAM）as a coagulant aid to pre-treat waste water from medium density fiberboard （MDF） production. This research investigated the dosage and mixing time effects of PFS and PAM. The results showed that the dosage of PFS was the most important factor. We found that when 1.8 g/L of PFS was added to the waste water and mixed for 30 seconds followed with 15 mg/L of PAM and mixed for 90 seconds,the removal rates of oxygen demand （CODcr） and suspended solids（SS）reached 64.59% and 91.06%,respectively.关键词：Orthogonal test;MDF wastewater;coagulation;PFS;PAM
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发布时间：2021-02-08 - 摘要：Effects of solid content of phenol formaldehyde （PF） resin solution,softening treatment time and softening agents,and use of plasticizer on dimensional stability of boards made from crushed bamboo strips were investigated. The results showed that the solid content of PF resin solution and softening pretreatment had considerable influence on the dimensional stability of the bamboo board,while the plasticizer content only showed the minor effect on the board dimensional stability.关键词：crushed bamboo strip board;dimensional stability;resin solid content;softening;plasticizer
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发布时间：2021-02-08 - 摘要：Soundproof wood-based flooring is a new product developed for acoustic noise reduction. Currently,there is no standard available for evaluating the acoustic performance of wood-based flooring. The authors developed a test method for dropping a free falling steel ball from a specified height and impacting the flooring to simulate people walking on flooring. The acoustic signal of the impact was collected and analyzed as an index to describe the acoustic performance. Different steel balls hitting various floorings,including solid flooring,laminate flooring,parquet flooring and cork flooring,were performed. The results showed that this method was feasible and further study was needed.关键词：wood based flooring;noise;impact insulation;improvement value of impact sound insulation
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发布时间：2021-02-08
Piactical Techniques
- 摘要：GB/T 18107-2000《红木》标准自2000年颁布以来,在贯彻实施中,由于一些企业对标准理解的偏差,出现不实宣传,导致不少消费者对于红木制品产生诸多疑问。为明确红木的定义,规范红木家具市场,本刊特邀《红木》标准起草人,我国资深木材鉴定专家——姜笑梅研究员,针对红木与深色名贵硬木的材质区别,以及红木制品中边材的问题,进行系列分析与评述。
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发布时间：2021-02-08
Practical Techniques
- 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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