最新刊期
期 0 ， 2020
- 摘要：The ultrasonic method,one of the important non-destructive evaluation（NDE） technologies,was used to determine the dynamic modulus of elasticity（DMOE） of dimensional lumber collected from a commercial larch（Larix gmelinii） forestry plantation in China.The modulus of elasticity（MOE） and modulus of rupture（MOR） were measured by a three-point bending test.The relationship between DMOE and static MOE,as well as the one between DMOE and static MOR were analyzed.The results indicated that the average DMOE value was greater than the average MOE value.Moreover,the relationship between DMOE and MOE and the relationship between DMOE and MOR were both significant at the 0.01 level.On the other hand,the determination coefficient between DMOE and MOE was greater than that between DMOE and MOR.关键词：non-destructive testing;ultrasonic method;dimensional lumber;dynamic modulus of elasticity;modulus of elasticity;modulus of rupture
- 7
- |
- 112
- |
- 15
发布时间：2021-02-08
- 摘要：The authors prepared a modified soy-based protein adhesive and used it to manufacture poplar particleboard.An orthogonal experiment was designed to optimize the following process parameters: hot pressing temperature and time,glue content and a water-proof agent.Results showed that under the 170 ℃ press temperature,10% adhesive content,1.4% water-proof agent spread,and 1.2 min/mm pressing time,the 0.70 g/cm3 density particleboard had mechanical properties exceeding the Chinese National GB/T 4897.4-2003 standard requirements.关键词：modified soy-based protein adhesive;poplar particleboard;pressing technology;physical and mechanical properties
- 7
- |
- 151
- |
- 19
发布时间：2021-02-08 - 摘要：The nail joint is a common connection used in timber structures.This paper focuses on nailed joint performance of larch lumber,a common species in northeast China.The authors introduced the test methods for American nailed joints and how to develop the design values for wood structures with domestic wood species. The results could be used to develop design values of larch in this area.关键词：nailed joint;larch;lateral resistance values;withdrawal values
- 8
- |
- 84
- |
- 2
发布时间：2021-02-08 - 摘要：To improve utilization efficiency,bamboo（phyllostachys pubescens） culms were cut into arc plates for further value-added processes.In this paper,the drying characteristics of bamboo arc plate were investigated.The results showed that the higher the drying temperature,the greater the shrinkage rate and deformation.The average of tangential shrinkage rate was larger than that of the radial shrinkage rate.The tangential shrinkage rate of the outer wall of a bamboo culm was nearly twice of that of the inner wall.When the moisture content was below 5 percent,the drying rate and the shrinkage rate tended stable.Finally,it was observed that as the drying temperature rose,warp,crimping,and split were increased considerably.关键词：phyllostachys pubescens;bamboo,arc spatulate;Drying properties;shrinkage rate;Deformation
- 10
- |
- 120
- |
- 7
发布时间：2021-02-08 - 摘要：Stress wave equipment was used to detect defects in olive tree stems（Populus euphratica）.Results showed the equipment could quickly diagnose tree trunks’ decay,but could not accurately detect surface cracks in tree stems.A binomial formula was used to develop a relationship between velocity and transmission angle.The formula alone,with the velocity pattern from a healthy tree trunk cross-section,could be used to diagnoses the defects in a tree trunk.关键词：ancient and famous trees;stress wave;diagnoses;healthy assessment
- 8
- |
- 215
- |
- 25
发布时间：2021-02-08 - 摘要：The authors studied the effect of wood moisture content on properties of moisture-curing isocyanate adhesive（YQJ-S）.Results showed that the adhesive curing reaction increased as the wood moisture content increased.Furthermore,the curing reaction could also be started at lower temperatures with higher moisture contents.Because the curing activation energy of the YQJ-S adhesive was 84.25 kJ·mol——1-,the adhesive could even react with high moisture content wood at room temperature.They determined that the bonding strength of the YQJ-S adhesive reached a maximum when the wood moisture content was 70%.关键词：moisture curing;isocyanate adhesive;moisture content;wetability;permeability;curing reaction;bonding properties
- 6
- |
- 156
- |
- 1
发布时间：2021-02-08
Research & Development
- 摘要：This article illustrates the main equipments used in the laminated flooring manufacturing.The short circle hot press,splitting saw,tongue & groove line,and bevel treating machines were discussed.关键词：laminated flooring;flooring processing;key machines
- 9
- |
- 265
- |
- 8
发布时间：2021-02-08 - 摘要：ISO/TC 218 and ISO/TC 165 are two standard organization committees responsible for timber products and timber structures,respectively.The authors described the operation of ISO/TC 218 and ISO/TC 165,and reviewed the progress of China’s involvement with developing the standards.We also suggested that China become a more active participant with the committees working on the standards.关键词：international standard;Timber;ISO;China
- 6
- |
- 74
- |
- 7
发布时间：2021-02-08 - 摘要：To improve wood drying kiln efficiency,the following conditions in conventional dry kilns were analyzed for this paper: wall structure,wall insulation,heat exchanger vapor temperature,air velocity,heat exchanger area and temperature and weather conditions in different areas of China.The results showed that kiln walls,wall insulation,and vapor temperature inside the heat exchanger played important roles for reducing energy consumption.Kilns in cold regions required more heat exchangers than in warm regions.It was found that the air velocity also affected heat exchanger performance.关键词：wood drying;conventional drying kiln;heat exchanger area;configuration
- 13
- |
- 115
- |
- 6
发布时间：2021-02-08 - 摘要：Bamboo-plastic composite material is an innovative product with the bamboo component serving as a reinforcing agent,or filler,in a continuous thermoplastic matrix.This article summarizes recent research on the effect of constitution mechanisms and processing technologies on the performance of bamboo-plastic reinforced composites.It also analyzes the key processing problems and needs for improvement.Finally,suggestions for future research directions and applications for bamboo-plastic composite materials are provided.关键词：bamboo;Plastic;bamboo-plastic reinforced composite;modification;combination mechanism;processing technology
- 7
- |
- 544
- |
- 18
发布时间：2021-02-08 - 摘要：A soundproof flooring,made with a wood-rubber composite,is a new flooring product for the Chinese market.The authors used a value engineering system to evaluate the flooring cost and function.First,they analyzed the function of each flooring component and estimated the cost coefficients on a 0～1 evaluation method.Then,they adopted the most appropriate method to conduct the evaluation.The results showed that the structure and material consumption of the soundproof flooring was optimized.关键词：soundproof flooring;function;cost;analysis;value engineering
- 8
- |
- 81
- |
- 1
发布时间：2021-02-08 - 摘要：The problems and operational requirements of solid wood furniture assembly in many companies in the southern region of China were investigated for this paper.The design principles and methods to optimize assembly were summarized to help these companies reduce costs and increase production.关键词：design for assemble;solid wood furniture;design practice;design method
- 13
- |
- 320
- |
- 9
发布时间：2021-02-08
Discussion & Suggestion
- 摘要：Different temperatures of superheated steam were used to pre-treat boxed-heart larch lumber.A series of radio frequency vacuum drying tests were then conducted on the pretreated lumber.The results showed that the number and the total length of surface checks decreased considerably in the samples pretreated under 105 ℃ atmospheric superheated steam for 31 hours.We also observed that the final moisture content distribution was more uniform with the pretreatment.Based on the drying cycle and drying quality,we concluded that the superheated steam pretreatment was feasible for mills even though it required a longer drying cycle.关键词：larch;radio frequency/vacuum drying;boxed-heart lumber;Superheated Steam;pretreatment
- 11
- |
- 135
- |
- 9
发布时间：2021-02-08 - 摘要：In this study,the effects of different ammoniacal copper quaternary(ACQ) preservative formulations on metal corrosion were investigated through designing an orthogonal experiment.The results showed that ACQ preservative had little corrosion effect on 304 stainless steel.The chloride ion in was identified as the principal factor that accelerated Q235A steel corrosion.Copper oxide concentration and the mass ratio of copper oxide to monoethanolamine had a remarkable influence on red brass corrosion.It was also found that all copper oxide concentrations,the mass ratio of copper oxide to monoethanolamine,and the mass ratio of copper oxide to DDAC contributed to hot-dipped galvanized steel corrosion.关键词：ACQ;Wood preservative;preservative formulations;metal corrosion;pH value
- 9
- |
- 1
- |
- 0
发布时间：2021-02-08
Piactical Techniques
- 摘要：Considerable straw-based composite research has been done due to the shortage of wood resources and environmental impact from burning straw.To date,various efforts have involved making straw panels with a mixed degree of success.The Forest Products business unit of Alberta Research Council has developed oriented structural straw board（OSSB） in cooperation with Panel Board Holding BV of The Netherlands（PBH）.PBH has built up the world’s first OSSB factory in China – Yangling board manufacturing of the Leenderson Panel Company.The OSSB product is comparable to wood-based oriented strand board（OSB） in both physical and mechanical properties at comparable densities.For their OSSB application,PBH has also developed a light steel-framed OSSB housing system.This paper will outline the OSSB’s manufacturing technique,panel properties,and its housing system.关键词：straw;structural panel;building material;housing system
- 10
- |
- 335
- |
- 19
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
- 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