最新刊期
期 0 ， 2020
- 摘要：Timber construction in China is gaining more attention and use of metal-plate-connected trusses made from dahurian larch dimensional lumber and imported truss plates is becoming more popular for light frame wood construction.This study evaluated tension test results（ultimate strength and tooth withdrawal） for the truss connections according to GB 50005-2003.The load-displacement curves were modeled using Foschi’s equation.The accuracy and efficiency of the Foschi’s model were examined and a conservative method of determining connection ductility ratio was proposed.The result showed that the ductility ratio varied with the types of connections and with a connection of α=0°,was higher than 2.0 which is a typical value used in a seismic resistant structure.关键词：Larix gmellini;truss plate;tooth withdrawal;ultimate strength;Foschi equation;ductility ratio
- 10
- |
- 82
- |
- 15
发布时间：2021-02-08 - 摘要：Waterproofing additives,one imported and one domestic,were added to commonly-used CCA and ACQ wood preservatives to improve the water resistance.The authors found that both waterproofing additives could decrease water absorption,but increased wood shrinkage.It was also noticed that the wood swelling remained about the same and preservative impregnability slightly decreased.关键词：waterproof additives;water absorption;shrinkage;swelling;impregnability
- 15
- |
- 211
- |
- 7
发布时间：2021-02-08
- 摘要：Heat treatment is a commonly used method to improve certain performance of wood and bamboo materials.However,it also causes a color change that could be used by many manufacturers to make bamboo products with different appearances.To provide basic guidance and reference for the bamboo processing industry,the authors of this paper investigated the effects of temperature and duration of heat treatment on the color shift of bamboo.Specimens were made from mosa bamboo（Phyllostachys pubescence） and were treated under temperatures from 100 ℃ to 220 ℃ and with durations of 1～4 hours.The lightness（L*）,red hue（a*）,yellow hue（b*）,and aberration（△E*） of the treated bamboo were evaluated.The results showed that the heating temperature and duration had remarkable effects on the L*,a* and b* of the specimens.The aberration of the treated specimens increased with increasing temperature and duration.关键词：bamboo;heat treatment;color shift;lightness;red hue;yellow hue;aberration
- 6
- |
- 240
- |
- 31
发布时间：2021-02-08 - 摘要：Ammoniacal Copper Quat（ACQ）,Copper Azole（CuAz）,and Copper Naphthenate（CuN） preservatives were selected to treat bamboo strands before making bamboo oriented strand board（BOSB）.The influence of the preservatives on the board properties were investigated.The results showed that the physical and mechanical properties of all treated BOSB boards exceeded the requirements for grade OSB/3 according to the Chinese Forestry Industry Standard ’Oriented strand board’-LY/T 1580-2000.Boards treated by CuAz and CuN even met the specifications for grade OSB/4.Generally,boards treated by CuAz and CuN showed better performance than that by ACQ.It was fount that properties of the board treated with excessive CuAz（2.21 kg/m3） were lower than those of control boards.However,there were no obvious results indicating that the ACQ adversely affected the properties of BOSB panels.关键词：copper-based preservatives;bamboo oriented strand board;phenol formaldehyde resin;properties
- 10
- |
- 150
- |
- 9
发布时间：2021-02-08 - 摘要：In this paper,the authors studied the relations between water absorption and size of cork materials（cork particles and cork bulks）,and the effects of chemical treatments and vacuum-pressure on water absorption of cork materials.The results showed smaller sized cork material absorbed more water and the chemical treatment had a considerable effect on their water absorption.It was noticed that vacuum-pressure had no significant effect on water absorption.关键词：cork material;water absorption;penetrating agents;vacuum-pressure
- 9
- |
- 245
- |
- 5
发布时间：2021-02-08 - 摘要：The authors of this paper conducted an experiment to investigate discoloration of polyurethane and acrylic coated veneers to improve the lightfastness of paint coated wood.Scots pine and poplar veneers were selected and coated by two methods（direct painting and covering with a coated film）.The coated veneers were exposed under a Xenon-lamp attenuation instrument for an accelerated test.The results showed the color change trend of coated veneers of both species was similar.However,the aberration of the paint coated veneer was higher than that of the veneers covered with coated films.关键词：paint;paint coated veneer;film covered veneer;light-induced discoloration
- 12
- |
- 51
- |
- 3
发布时间：2021-02-08 - 摘要：The internal structure and density characteristics of Sophora japonica waferboard,Cryptomeria fortunei scrimber,and wheat straw boards were evaluated using X-ray based computer tomography（CT）.The results indicated computer tomography was an effective tool to determine the panel density distribution both horizontally and vertically.It was found that the average density variations of waferboard and scrimber board were higher than wheat straw boards.It was also observed that the vertical density profile of waferboard did not show any uniformity while scrimber board and wheat straw board showed the typical W-and U-shape curves,respectively.关键词：computer tomography（CT）;nondestructive evaluation;wood-based panel;density
- 7
- |
- 198
- |
- 17
发布时间：2021-02-08
Research & Development
- 摘要：There are currently 9 national and 28 industrial standards related to bamboo and bamboo products that have been developed in China.Some local governments and companies are active in establishing their own specifications and requirements as China has not established a national standard.Obstacles impeding standardization include an unclear strategy,lack of ecology and cultivation standards,and poor coordination in developing standards.This paper reviewed the latest status for bamboo standardization in China and also presented suggestions for further development of standards for the bamboo industries.关键词：bamboo;national standards;standard system;standardization strategy
- 8
- |
- 307
- |
- 22
发布时间：2021-02-08 - 摘要：Wood can be converted to thermoplastic material by means of chemical modification such as esterification and etherification.The performance of wood products can be improved through esterification and etherification.With proper chemical treatments,wood flakes and fibers could possibly produce self-bonded flakeboard,fiberboard,and other products without any additional adhesive.Thermoplasticization of wood by chemical modification provides a new innovative process to for the utilization of wood.In this paper,the main methods for the esterification and etherification of wood,the mechanism of plasticization,and the performance and utilization of thermoplastic wood are reviewed.The limitations and future trends for thermoplastic wood development are also presented.关键词：wood;thermoplasticization;esterification;etherification
- 5
- |
- 402
- |
- 16
发布时间：2021-02-08 - 摘要：Adhesives used to bond timbers with high moisture content were developed in the early 1980’s.These adhesives can be used to manufacture wood products for structural applications such as glulam.This paper reviewed the adhesive developed for three different processes: curing with heat,curing without heat（at room temperature）,and fast curing with catalysts.关键词：green wood;adhesives;glulam;phenol resorcinol formaldehyde（PRF） adhesive;one component polyurethane adhesive
- 6
- |
- 188
- |
- 5
发布时间：2021-02-08
Review
- 摘要：The current standard for laminate flooring products,GB/T 18102-2007,has replaced previous standard,GB/T 18102-2000.There are some differences in determining thickness swelling between the two standards.The authors evaluated the differences by testing samples cut from the same board using the two different standards.The results showed that the thickness swelling of the samples met the requirement of previous national standard,but did not reach the specification of the current standard.The authors explained the difference between the two methods and requested the laminate flooring manufacturers to adapt the new standard.关键词：laminate flooring;thickness swelling;standard;test
- 9
- |
- 109
- |
- 8
发布时间：2021-02-08 - 摘要：This article summarized test methods for determining formaldehyde concentration in air from wood-based products.Advantages and disadvantages of each test method were compared and presented.Finally,suggestions were made on how to revise and use the Chinese national standards for determining formaldehyde emission from wood-based products.关键词：wood-based panels;formaldehyde;test mefhods
- 12
- |
- 453
- |
- 21
发布时间：2021-02-08
Discussion & Suggestion
- 摘要：The authors of this paper studied the feasibility of using Poplar plywood,as an alternative material for solid wood,to make a sofa frame.The detailed processing technology for using poplar plywood was described in this paper.A sample sofa frame was made and illustrated.Bending rigidity of the corner joints and their fatigue performance were evaluated.The results showed that poplar plywood could replace solid wood in sofa manufacturing with adequate and stable mechanical performance.关键词：Poplar;plywood;sofa frame;technology;structure;performance
- 9
- |
- 162
- |
- 3
发布时间：2021-02-08 - 摘要：Durability and decay resistance of heat-treated wood is enhanced by the heating treatment in which the chemical composition of the wood can be modified to inhibit the decay fungi.In this study the decay resistance of heat-treated Pinus svlvestris was tested according to Chinese National Standards.The result showed that the weight loss of control wood specimens reached 53.3% and 32.8% while the weight loss of heat-treated wood was only 2.29 % and 0.69 % when the samples were attacked by brown rot and white rot fungus,respectively.The result of a two-year field test in Beijing showed the class of decay resistance was at a 0 level for control samples but at a 9.5 level for the heat-treated wood samples.The decay resistance level of heat-treated wood could reach level I（strong decay resistance）.关键词：Pinus svlvestris;heat-treated lumber;durability;laboratory test;field test
- 9
- |
- 110
- |
- 13
发布时间：2021-02-08 - 摘要：Bamboo charcoal,made through a high temperature pyrolysis process,provides a new way to utilize bamboo.The effects of species and age of the bamboo,carbonization temperature and time on the yield rate and specific surface area were evaluated in this study.The results showed that the specific surface area was considerably affected by both carbonization temperature and time.The bamboo charcoal had the maximum specific surface area when treated at 800 ℃ for a duration of 23 hours.关键词：bamboo charcoal;carbonization;specific surface area;pore diameter distribution;yield rate of carbonization
- 10
- |
- 365
- |
- 22
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
- Tel：010-62889419 Email：mckx@caf.ac.cn
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
- Total Visits：16680
0