最新刊期
期 0 ， 2020
- 摘要：Creep characteristics of two different adhesives were studied under different experimental conditions according to American ASTM standard D3535 and Canadian standard CAS 0112.9-04.The resin systems evaluated in this study were resorcinol phenol formaldehyde（RPF） and regular phenol formaldehyde（PF）.The wood materials used were Korean Pine,larch,fir and birch.The average and maximum creep values of samples under a constant load were recorded.The results showed that the creep performance of RPF adhesive was superior to that of PF adhesive.For the same resin system,it was observed that the adhesive creep performance was better in the Korean pine and larch specimens than the fir and birch specimens.关键词：RPF adhesive;PF adhesive;creep
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发布时间：2021-02-08 - 摘要：According to the standards of the American Society for Testing and Materials（ASTM） and the Chinese domestic manufacturing specification of solid wood flooring,the machinability of phenol formaldehyde（PF） resin densified poplar lumber was evaluated.The properties evaluated included cross-cutting,planning,tenonning,and sanding.Compared with the untreated control samples,the densified samples exhibited considerably better performance.Machining defects,such as torn grain and fuzzy surface,were reduced.Surface smoothness and flatness of machined sections were also improved.The results indicated that the densification of low density and fast growing poplar lumber with PF resin improved the overall machinability and added value to its flooring products.关键词：phenol formaldehyde resin;densification;Poplar;machinability
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发布时间：2021-02-08 - 摘要：This paper introduces a surface treatment of low temperature plasma on bamboo strips to improve their surface gluability and increase the product efficiency.A detailed description of this technique as applied to commercial equipment such as design,manufacture,and installation was described.A low temperature plasma processor was successfully used in a commercial plant.The result showed that after surface treatment bamboo utilization and bonding strength were both improved.关键词：plasma;bamboo strip;surface treatment;plasma processor;gluability
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发布时间：2021-02-08 - 摘要：The effect of heat-treatment on Chinese Fir to improve decay resisfamce was investigated in this study.After being heat-treated,Chinese Fir samples were exposed to white-rot fungus（Coriolus versioolor） and brown-rot fungus（Poria vaporaria） for 12 weeks and their weight losses were monitored periodically.It was found that white rot fungus had very little effect on the durability.However,the brown rot fungus caused about 40% weight loss in the control samples.After being heat-treated at 220 ℃ for 3 hours,the Chinese fir samples had no measurable weight loss when exposed to the brown rot fungus for 12 weeks.关键词：heat treatment;white-rot fungi;brown-rot fungi;decay resistance
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发布时间：2021-02-08
Research & Development
- 摘要：Small samples of medium density fiberboard were treated at various temperatures and durations in a dry oven.The mechanical properties of these samples were evaluated to examine the effect of the heat-treatment.The results showed that temperature has a significant effect on the modulus of rupture while duration exhibited considerable impact on internal bond and modulus of elasticity.It was observed that heat treatment could improve internal bond when the press time was not long enough to cure the binder.关键词：medium density fiberboard;mechanical properties;heat treatment
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发布时间：2021-02-08 - 摘要：High density and low impact strength of traditional wood/plastic composites（WPC） present some barriers for their application in building construction.To reduce the density of WPC,the authors added a foam beater in the mixture of wheat straw and polyethylene（PE） before extrusion moulding.The effects of the wheat straw content,foam beater content,and wheat straw size on the composite performance were evaluated and presented in this study.The optimized parameters to make a low density straw and polyethylene composite were: the content ratio of polyethylene to wheat straw flour and the foam beater was 100∶30∶2,with the wheat straw flour 80120 mesh size.关键词：wood/plastic composites;wheat straw;polyethylene（PE）;microc-foaming;mechanical properties
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发布时间：2021-02-08
Research Bulletin
- 摘要：Using titanium dioxide（TiO2） to enhance the performance of wood-based composites is increasingly visible in China.This paper introduced the primary theory and characteristics of photocatalytic activity of TiO2 and also reviewed worldwide research efforts of the application of TiO2 in the wood industry.Summaries and discussions are presented about the advantages and future research needs to develop potential prospects that TiO2 may have to improve wood-based composites such as multifunctional,environmentally-friendly,anti-ultraviolet,and reinforced materials.关键词：titanium dioxide;wood industry;application;performance enhancement
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发布时间：2021-02-08 - 摘要：Metal-plate-connected（MPC） wood trusses for roofs and floors have been used in light-frame residential and commercial constructions for decades.Proper design and performance optimization of metal-plate connectors play an important role in manufacturing trusses and even throughout whole light frame structures.In this article,the basic principle of metal-plate connections,latest static and dynamic testing results,the failure mode and the impact factors on the connections were reviewed.Based on an extensive literature search,the authors provided some useful suggestions and guidance to develop and manufacture metal-plate connected wood truss in China.关键词：metal-plate connector;splice joint;heel joint;failure modes;wood truss
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发布时间：2021-02-08 - 摘要：High speed milling technology has made a great impact on the process improvement in the wood product industry.However,the abrasion of machine tools is still an obstacle for implementing high speed milling technology.To study the abrasion behavior of high speed milling tools,the author selected a widely-used TiAlN coated tool to mill three commercial hardwood samples.The result indicted that milling speed,sample hardness,moisture content,and grain direction had a considerable effect on tool wear.It was noticed that reducing friction with a proper tool coating was an effective way to minimize tool abrasion.关键词：TiAlN;coated tool;hardwood;high speed milling;abrasion
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发布时间：2021-02-08
Discussion & Suggestion
- 摘要：An increasing demand for wood to meet the furniture market provides challenges and opportunities to explore new and fast growing materials for making curved lumber.Plantation poplar,which is a fast growing and relatively low value species,was used to make curved laminated-veneer furniture parts and then their physical and mechanical performances were evaluated in this study.The results indicated that properties of the furniture parts met the national standard requirements.This showed that laminated poplar veneer lumber could substitute some solid wood in furniture manufacturing and thus add value to poplar-based products.关键词：plantation poplar;veneer;furniture;curved laminated veneer lumber;properties
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发布时间：2021-02-08 - 摘要：Eucalyptus and poplar plantations,over 4.8×106 hm2,play a very import role in the raw material supply chain in China’s wood panel industry.A literature search found that research on utilizing these fast growing trees to manufacture structural plywood was limited.In this study,the authors investigated the effect of selected processing factors（pressing temperature,pressing time,pressing pressure,and adhesive usage） on the bonding strength of structural plywood panels made from mixed Eucalyptus/poplar veneer.The results showed that all the selected parameters affected significantly on the bonding strength.The optimal processing parameters for producing eucalyptus/poplar plywood panels in this study were: hot pressing temperature =135 ℃,pressing time = 1.5 min/mm,pressing pressure = 0.8 MPa,and adhesive usage = 320 g/m2.关键词：eucalyptus;poplar;structural plywood;bond technology;bonding strength
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发布时间：2021-02-08 - 摘要：Moisture absorption and thickness swell of heat-treated solid wood flooring samples and conventional dried flooring samples were studied under 3 simulated indoor conditions: summer in southern China（26 ℃ and 80% relative humidity）,winter in northern China with common heating system（22 ℃ and 42% relative humidity）,and winter with an under floor heating system（25 ℃ and 25% relative humidity）.The results showed that heat-treated flooring samples exhibited better dimensional stability than the conventionally dried flooring subjected to the indoor conditions of northern China.However,these same samples absorbed more moisture and had greater thickness swell when subjected to southern China’s humid environment.The results were expected to provide some basic information for manufacturers to establish their product specifications.关键词：heat-treated wood;flooring;dimensional stability
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发布时间：2021-02-08 - 摘要：Bamboo crushed-strip board（BCSB）,which utilizes more than 90% raw material,is increasingly used to manufacture bamboo furniture and flooring in China.However,the non-uniform resin distribution and less resin usage due to the geometry and surface quality of the crushed bamboo strips caused the delamination and defects of the final products.To increase the resin usage and improve the dimensional stability,the authors chose three surfactants to modify the phenol formaldehyde resin to improve the resin penetration into the bamboo strips.It was found that all surfactants improved board dimensional stability.When the content of surfactants OP-10 and PEG-100 was 2.0% and 1.5% respectively,the dimensional changes were reduced by 1.8% in width and 2.7% in thickness.关键词：bamboo crushed-strip board;dimensional stability;surfactants;soakage;resin content
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发布时间：2021-02-08 - 摘要：Tebuconazole preservatives,has been gradually introduced into the wood industry.However,lack of rapid and accurate determination of Tebuconazole content in preservative treated wood prevents establishing an effective way for process and quality control.Reversed-phase high performance liquid chromatography（RP-HPLC） has been identified in this study as a simple and effective method for determination of the tebuconazole content in a wood preservative.关键词：liquid chromatography;RP-HPLC;wood preservative formulations;tebuconazole
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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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