最新刊期
期 4 ， 2019
- 摘要：Carbon fiber sheets（CFS）and glass fiber sheets（GFS）were hot pressed on bamboo scrimber board’s surface with epoxy resin,respectively.The reinforced bamboo scrimber board samples were tested to evaluate the influence of CFS or GFS on mechanical properties and water resistance of the boards.The results showed that both mechanical properties and water resistance were improved significantly with reinforcement of CFS and GFS.The properties of the samples reinforced at both sides were greater than those of the samples reinforced at single side,and the properties of the samples reinforced with CFS were better than those of the samples reinforced with GFS.关键词：bamboo scrimber board;carbon fiber sheet（CFS）;glass fiber sheet（GFS）;mechanical properties;water resistance
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发布时间：2021-02-07 - 摘要：Contact lengths of sanding belts for Pinus sylvestris wood and medium density fiberboard（MDF）samples were measured during sanding process by grindable bipolar thermocouple.It was found that the actual contact lengths were longer than geometric ones,and that the contact lengths decreased linearly with increase of sanding belt speeds,but increased with increase of feed rates and sanding thickness.The contact lengths of Pinus sylvestris wood was smaller than that of MDF with greater normal sanding forces.It proved that material properties except normal forces had an important impact on the contact lengths.No regular changes of the contact lengths under sanding heat generated by instantaneous low temperature were observed.关键词：wood materials;sanding belt;sanding parameters;contact length
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发布时间：2021-02-07 - 摘要：To better understand growth characteristics of heartwood and sapwood and variation in heartwood formation of Catalpa bungei,a series of experiments were conducted to measure ring number,and widths of heartwood and sapwood at different tree heights by using tree-ring measuring station.A regression model of relationship between heartwood and tree growth was established.The results showed that annual ring widths of the trees reached peak at the 10th～15th year and could maintain the peak in 10 years.The heartwood started to form at age 5.26 a,and the heartwood growth rate was 0.90 rounds/a.It was concluded that Catalpa bungei is a hardwood species with a short growing and harvesting period,an early heartwood forming period and a fast growing rate.关键词：Catalpa bungei;heartwood;sapwood;growth characteristics;variation
- 11
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发布时间：2021-02-07 - 摘要：Spruce wood is one of the main materials for making piano soundboard.In order to understand effects of spruce grain angles on acoustic vibration properties of piano soundboard,four types of spruce species were selected and three grain angles of each spruce species were tested to measure the acoustic vibration properties by the Fast Fourier Transform analysis（FFT）.Wood acoustic parameters tested were dynamic elastic modulus,specific elastic modulus,acoustic radiation damping coefficient and absorption coefficient as well as loss tangent.The testing results showed that most of the acoustic parameters of the wood samples increased but the loss tangent decreased with the increase of grain angles.The wood samples with 90° of grain angle presented the highest vibration efficiency and the lowest acoustic energy loss.According to a comprehensive weighting results,soundboard made of Picea brachytyla wood with 90° of grain angle showed the best vibration property.关键词：spruce wood;grain angle;soundboard;acoustic vibration property
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- 4
发布时间：2021-02-07 - 摘要：Gas Chromatography-Mass Spectrometer（GC-MS）combined with chemometrics methods were used to analyze volatile components in Santalum album Heartwood.The results showed that GC-MS chromatographs of petroleum ether extracts were similar to those of the essential oils distilled from Santalum album heartwood,which meant that the petroleum ether extracts could profile volatile components in Santalum album heartwood.The volatile components profiles of Santalum album from 4 habitats were similar in components but different in concentrations.A discriminate analysis（DA）model based on the percentiles of a-santalol,β-santalene, Z-a-trans-bergamotol,epi-β-santalol and β-santalol was proposed to identify Indian Santalum album.关键词：Santalum album;volatile components;gas chromatography-mass spectrometer（GC-MS）;multivariate analysis;discrimination
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- 193
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发布时间：2021-02-07 - 摘要：In order to rapidly and accurately identify Pterocarpus santalinus and Pterocarpus tinctorius wood,pyrolysis-gas chromatography-mass spectrometry（PY-GC-MS）and thin layer chromatography（TLC）were used to obtain fluorescence spot numbers and Rf values by contrasting total ions chromatogram produced through rapid pyrolysis at a low temperature,peak time of main components and difference among products of pyrolysis.The two methods were both successful in identifying the two wood species.PY-GC-MS was an effective technique in identifying wood species for precious cultural relics and high-end furniture because of high accuracy and a small sample sizes,while TLC was simple to operate and easy to be applied without aid of large instruments.关键词：wood identification;Pterocarpus santalinus wood;Pterocarpus tinctorius wood;PY-GC-MS;TLC
- 10
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- 212
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- 1
发布时间：2021-02-07
Research & Development
- 摘要：Lignin nanoparticles possess characteristics of both lignin and nanomaterials,which have great application potential.Research progress of fabrication and application of lignin nanoparticles was reviewed.Lignin nanoparticles could be a new way for better use of the lignin.In addition,due to high specific surface area,multi-groups,antibacterial and non-toxic characteristics,lignin nanoparticles may be widely used in many fields,such as biological medicine,new energy,forest product processing etc.关键词：lignin nanoparticles;preparation method;application status
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- 514
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发布时间：2021-02-07 - 摘要：Based on GB/T 17657-2013,a desiccator method was used to measure formaldehyde release of medium density fiberboards（MDF）.Eight kinds of formaldehyde scavengers from market were investigated on their effects of formaldehyde emissions,spray volumes and test durations on clearing rates and attenuation rates of the scavengers.Testing results showed that at（2.06～4.12）mg/L of formaldehyde emissions with（75±5）g/m2 of spray volume for 7 days of test duration,the clearing rates and attenuation rates could be used to test clearing capacity of formaldehyde scavengers关键词：wood-based panels;free formaldehyde;formaldehyde scavenger;formaldehyde clearance rate;attenuation rate;desiccator method
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- 150
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发布时间：2021-02-07 - 摘要：Product standards of bunk beds in domestic and foreign countries as well as the existing problems in Chinese National Standards of bunk beds were briefly reviewed.Based on results of commissioned product testing and government quality inspections,main quality issues of bunk bed products were analyzed.Suggestions were also provided for relevant national standard revisions and product quality control of bunk beds.关键词：bunk bed;standard;quality
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- 71
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发布时间：2021-02-07 - 摘要：As the largest plywood production centre in Northern China,Wen’an has been played a critical role in local economy and employment.Along with the Beijing-Tianjin-Hebei integration and Bohai Economic Belt development,the traditional plywood industry is facing great challenges of transformation and up grading.A survey on product categories,production capacities,raw material sources,as well as production line status and equipment situation was conducted at 28 plywood manufacturers in Wen’an County.Suggestions were provided accordingly.关键词：plywood;Wen’an County;industry current situation;suggestions
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- 80
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发布时间：2021-02-07
Discussion & Suggestion
- 摘要：Experiments were conducted on evaluating machining performance（including planning,turning,sanding,shaping,drilling,and mortising）of imported Mahogany and Radiate pine wood from plantation forests according to LY/T 2054-2012 "Methods for evaluating machining properties of lumber".The results showed as follows:most of the machining performance of Mahogany and Radiate Pine wood samples were in excellent grade except drilling property,which was in fair and middle grade,respectively.The machining performance of Mahogany wood was generally better than that of Radiate pine wood.Both Mahogany and Radiate pine wood were excellent for making furniture and other solid wood products.关键词：mahogany;radiate pine;machining performance;quality grade value
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发布时间：2021-02-07 - 摘要：water-based acrylic and solvent-borne polyurethane lacquers were used to paint imported wood of Swietenia macrophylla and Pinus radiata, respectively.Chromaticity of the wood samples was measured before and after painting in order to evaluate painting film performance.The results showed that color saturation,overall color difference and glossiness value were increased after painting,while overall color difference with polyurethane lacquers was greater than that with acrylic waterborne lacquers.The painting film performance could reach either the first or the second grade according to Chinese National Standard GB/T4893.The film of solvent-borne polyurethane lacquers showed superior strength in hardness,while film of the water-borne acrylic lacquers had excellent adhesion performance.关键词：imported wood;lacquer;painting;film performance;color difference;gloss
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发布时间：2021-02-07
- 摘要：In order to improve deformation resistance of wood-based composite doors made with laminated veneer lumber（LVL）,LVL components assambled in vertical-horizontal-vertical directions were designed to replace common LVL components arranged in one direction.Performance of the optimized LVL components and door leaves were tested.The results showed that the optimized components were more uniform and the overall mechanical performance was significantly better than those made with common LVL components.The door leaves made with the optimized components showed higher horizontal shear strength,modulus of rupture and modulus of elasticity properties than the ones with commonly LVL components.关键词：wood-based composite door;door leaf;component;LVL;structural design;deformation resistance
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发布时间：2021-02-07 - 摘要：Corn straw particleboard samples were manufactured with sodium silicate/phenolic resins.Effects of the resin consumption,hot pressing temperature and pressing time on physical and mechanical properties of the samples were then investigated.24 h-thickness swelling（TS）property of the samples presented a decrease trend while modulus of rupture（MOR）,modulus of elasticity（MOE）and internal bond strength（IB）of the samples showed increased and then decreased tendency,with increased resin consumption,hot pressing temperature and hot pressing time Optimized manufacturing parameters were 17% of resin consumption,180℃ of hot pressing temperature,and 20 s/mm of hot pressing time.The TS and mechanical properties of the board samples could meet the requirements of GB/T 4897-2015 for P2 type.关键词：corn straw particleboard;manufacture technology;property;sodium silicate/phenolic resin
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发布时间：2021-02-07
Piactical 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
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
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