最新刊期
期 0 ， 2020
- 摘要：The crushed bamboo mat was treated with the ammonium polyphosphate （ APP） and was then used to make crushed bamboo-mat composite. The mechanical properties,fire performance,pyrolysis behavior of the composite were evaluated. The results showed that compared to untreated crushed bamboo-mat composite, mechanical properties of crushed bamboo-mat composite with APP treatment remained about the same,while the fire retardant performance was improved considerably,for the time to ignition（ TTI） was extended,while the heat release rate （ HRR） ,total heat release （ THR） and total smoke production （ TSP） were all reduced.关键词：APP;crushed bamboo-mat composite;mechanical properties;fire performance
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发布时间：2021-02-08
- 摘要：The bending deflection and hygroscopic thickness expansion of solid wood and laminated veneer lumber （ LVL） beams under load were monitored in various humidity conditions to approach the basic law of the creep in varying humidity and its relationship with the changing dimension and the difference from the creep in uniform humidity. Results showed that the total bending creep deflections （ TBCD） after 2 cycles in RH 42% →80% →42% followed by an adsorption up to 80% were 1. 80 and 1. 46 times as those in the same period in the uniform RH 80% for solid and LVL samples,respectively. The accumulated thickness expansions after the 2 humidity cycles were 0. 63% of the TBCD for the solid wood beams and 1. 27% for the LVL beams. The thickness expansion could not alter the basic law of mechano-sorptive creep of wood beams,but affected the bending creep deflection from either adsorption or desorption,especially the TBCD of the LVL.关键词：wood beam;mechano-sorptive creep;swelling and shrinkage
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发布时间：2021-02-08 - 摘要：A variety of volatile organic compounds （ VOC） ,released from bamboo flooring samples were monitored using auto thermal desorption （ ATD） and gas chromatography/mass spectrum （ GC/MS） . The double exponential attenuation model was used to fit these VOC releasing curves. The results showed that increasing the temperature greatly affected phase-one VOC emissions,dramatically increasing the initial emission rates. Increasing the humidity seemed to inhibit the VOC emissions at the beginning,but later increased VOC emissions in phase two.关键词：bamboo flooring;volatile organic compounds （ VOC）;test chamber;auto desorption
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发布时间：2021-02-08 - 摘要：To provide better understanding of the adhesion interface along the bonding line of Chinese fir glulam,the authors investigated the surface wettability of tangential section,radial section,heartwood, sapwood and different surface roughness. The results showed that the wettability of a radial section was better than that on a tangential section,the wettability of sapwood surface was better than that on heartwood surface,and the wettability of samples improved with increasing the surface roughness.关键词：Chinese Fir;contact angle;surface wettability;glulam;gluing
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发布时间：2021-02-08 - 摘要：Triazole fungicide has demonstrated a great potential in wood preservation. In order to develop a short synthetic route of triazole fungicides—1-（ 1H-1,2,4-triazole-1-yl）-2-tert-butyl-3 （ 4-chlorophenoxy） 2-propanol,the authors investigated the effects of molar ratio,reaction temperature,and reaction time on the yield of the target compound and evaluated its bacteriostasis. The result showed that the yield of the target compound was about 62% ,under the mole ratio of 1-（2-tert-butyl-2,3-epoxy propyl） 1h-1,4 trichlorobenzene triazole methane sulfonate to p-chlorophenol to sodium hydride 1∶ 1. 2∶ 1. 38,temperature 60 ℃ for 6 h. The target compound also showed promising inhibitory effect on the selected mold and woodrotting fungi.关键词：triazole compound;synthesis process;bacteriostasis
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发布时间：2021-02-08
Research & Development
- 摘要：The concept and characteristics for a low carbon economy were presented in this paper. Then the definition for the wood industry based on a low carbon economy was illustrated. The issues facing the Chinese wood industry from a low carbon economy view were analyzed. Finally,development strategies for the Chinese wood industry to realize a low carbon economy were provided. It was suggested that low-carbon standard systems and necessary industrial policies for the wood industry should be established.关键词：low carbon economic;wood industry;development strategy
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发布时间：2021-02-08 - 摘要：The standardization status of wooden furniture in China was briefly reviewed. According to the national inspection results and the current status of the Chinese wooden furniture industry,the authors analyzed the main causes of defective or downgraded wooden furniture products,and finally proposed some solutions and suggestions for improving the furniture quality.关键词：wooden furniture;standardization;quality
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发布时间：2021-02-08 - 摘要：Brush sanders without upholder are often used for sanding wood products with irregular surface. Maple and cherry sliced decorative veneers were selected for this study. The experiment evaluated the effect of sanding times,rotation speed,feeding speed,diameter of flap wheel,and depth of exposure on the surface roughness. The results indicated that the satisfied surface roughness could be obtained by increasing the sanding times and the rotation speed of the flap wheel while decreasing the feed speed and the diameter of the flap wheel. The influence of the depth of exposure on the surface roughness was dependent upon the diameter of the flap wheel and hardness of the wood.关键词：flap wheel without upholder;sliced veneer;sanding parameter;surface roughness
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发布时间：2021-02-08
Discussion & Suggestion
- 摘要：Three formulations of FR-2 （ phosphorus-nitrogen-boron ） fire retardants were prepared according to the AWPA P50-2010 standard. The three retardants were then used to treat Eucalyptus veneers for plywood. The effects of the fire retardant treatment on fire performance,bonding strength,and hygroscopicity of the plywood samples were evaluated. The results indicated that both fire retardancy and reduced smoke from the plywood were significantly improved after the fire-retardant treatment. Bonding strength and hygroscopic behavior of the samples after the treatment remained the same. We also found that PNB-1 fire retardant,composed of Monoammonium phosphate,Diammonium phosphate and Boric acid was the most suitable for Eucalyptus plywood among the three retardants.关键词：Eucalyptus plywood;FR-2 phosphorus-nitrogen-boron fire retardants;fire performance;bonding strength;Hygroscopicity
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发布时间：2021-02-08 - 摘要：In order to develop wood products with acceptable fire resistance and decay resistance, Southern Pine samples were treated with a boron-containing wood preservative （ DBM） which was a mixture of disodium octoborate tetrahydrate, boric acid, magnesium sulfate and dipropylene glycol methyl ether. Results indicated that the boron-based preservative not only improved the fire resistance,decay resistance,and reduced its leachibility,but also decreased the volume shrinkage and water absorption of treated samples.关键词：boron-containing wood preservative （ DBM ）;Fire resistance;decay resistance;wood structure
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发布时间：2021-02-08 - 摘要：In order to develop the optimized fire retarding treatment process,the authors used nitrogenphosphorus-boron fire retardant to treat poplar with different impregnation methods. Fire resistances of samples were evaluated through the limiting oxygen index （ LOI） ,drug loading,impregnation depth,heat release rate,and total heat release. Results showed that the optimized process was microwave heating samples for 2 minutes,impregnating the samples under ultrasonic waves for 30 minutes under a temperature of 40 ℃ . Under the same treatment,fire resistance of sapwood samples was slightly better than that of heartwood samples.关键词：nitrogen-phosphorus-boron fire retardant;Poplar;treatment process;Fire resistance
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发布时间：2021-02-08 - 摘要：To reduce the energy consumption of wood drying and optimize drying process for oak （ Quercus mongolica） ,the authors studied the effect of specimen thickness,initial moisture content and ambient temperature on preheating time. The results indicated that preheating time increased with specimen thickness in a non-linear relationship. Preheating time decreased with increasing ambient temperature. The initial moisture of the sample was found to have no obvious impact on preheating time. They suggested that the suitable preheat ambient temperature is around 70 ℃; preheating time could be appropriately prolonged when the initial moisture content of oak lumber is below fibre saturation point.关键词：oak;drying;preheating time;thickness;initial moisture content;ambient temperature
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发布时间：2021-02-08 - 摘要：Moso bamboo was processed to produce sliver plybamboo via the continuing hot-press method at a higher temperature. The effect of resin content on physical and mechanical properties was investigated. The results showed that increasing resin content improved the board water resistance and internal bond strength performance, but increased the manufacturing cost as well. It was proposed that the optimal resin content was 7% ～8%.关键词：sliver plybamboo;hot pressing;resin content;physical and mechanical properties;structural materials
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发布时间：2021-02-08
Piactical Techniques
- Address：Box 29，Research Institute of Wood Industry, No. 1, Dongxiaofu, Haidian District, Beijing Postal code：100091
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