最新刊期
期 0 ， 2020
- 摘要：The authors briefly introduced the importance of standardization,the new trends of standardization in developed countries,as well as the new situation,new tasks and new requirements faced by standardization in China.The main function of the National Technical Committee of Standardization for Wood-based Panels in China was also presented.The authors reviewed the development of standardization for wood-based panels in China and analyzed the main problems existed.Thereafter,necessary actions were suggested to promote standardization for wood-based panels in China,such as to strengthen standardization research,to initiate performance standards,to address public interest standards,to pay more attention to basic methodology standards and to actively participate in international standardization.关键词：China;wood-based panels;standardization
- 8
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- 85
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- 14
发布时间：2021-02-08 - 摘要：Wood-based flooring products have been one of the fastest growing sectors among wood products for the past two decades.The monotonic increases of wood-based flooring demand and sales from 2000 to 2007 indicate a faster growth rate in the near future.This paper reviewed the history of China’s wood-based flooring industry and presented the current status of its production,consumption,processing innovation,product quality,and sale distribution.Shortage of raw material supply,lack of product innovation,and irregular market competition were identified as key problems in the industry.Industrial consolidation,processing improvement,product innovation,and further domestic and international market development were considered as the long-term strategy for China’s wood-based flooring industry in the future.关键词：wood-based flooring;current status;development trend
- 11
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- 591
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- 22
发布时间：2021-02-08 - 摘要：Russia has rich forest resource accounting for 25% of the total volume in the world.The scale and quality of Russia’s forest resource provides a huge economic potential for its forest products industry despite its undeveloped transportation and economic conditions.The comparative advantages in forest products between China and Russia are extremely complementary.This provides an opportunity for Chinese investors to establish wood-based panel manufacturing plants in the far-eastern and Siberian areas of Russia.A feasibility study was conducted to examine the economic policies,wood product markets,and import/export potentials of Russia.Successful establishment of wood-based panel plants in Russia will not only provide relief to the increasing wood resource shortage in China,but also help local business by utilizing the forest resource more effectively and economically.关键词：wood-based panel;production line;feasibility study;Russia
- 4
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- 69
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- 3
发布时间：2021-02-08
Expert Forum
- 摘要：The rapid growth of world population has resulted in substantial increases in demand and consumption of all raw materials world wide.This provides a unique opportunity for developing new,naturally-renewable and environmentally-friendly,biodegradable composites.This paper reviews the current literature covering the background,current status,and importance to the environment for developing a kind of composite made by natural fiber and biodegradable plastics.It also discusses current trends,emerging applications and research needs for future development.The successful development of these biocomposites from abundant and renewable natural fiber resources will provide a strategic alternative solution to the continuing depletion of petroleum reserves,environmental pollution,and protection of the fragile environment.关键词：bio-composites;natural fiber;biodegradable plastics;polylactic acid
- 21
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- 1561
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- 40
发布时间：2021-02-08
Review
- 摘要：A thin layer of wax and inorganic silica on wheat straw surfaces has been known to be one of the major barriers in utilizing wheat straw for profitable and marketable composites.Enzyme pretreatments with Trichoderma sp.and Aspergillus niger were used in this study to improve surface wetability and bonding performance.The results showed that enzyme concentration and pretreatment duration had a significant effect on the surface bonding strength of wheat straw.Generally,higher enzyme concentration and longer pretreatment will increase the surface bonding strength.关键词：enzyme;pretreatment;wheat straw;surface bonding
- 8
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- 168
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- 30
发布时间：2021-02-08 - 摘要：Precise control and monitoring of press parameters play a very important role in wood-based composite manufacturing processes.A robust press control system was developed based on microcontroller ATmega128.By using serial communication methods between the microcontroller and a touch screen monitor,the control system allows press operators to set press parameters to control the press processes or to monitor the press process according to pre-existing settings.A field test showed the control system had excellent stability and high accuracy in controlling hot pressing parameters,such as,platen temperature,position,pressing speed,and pressure.关键词：microcontroller ATmega128;controller;testing press;control system
- 13
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- 73
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- 1
发布时间：2021-02-08 - 摘要：The thermal behavior of a modified soy-based protein adhesive was characterized with differential scanning calorimetry（DSC） in this study.After its theoretical curing temperature range from the DSC was identified,the soy-based adhesive was used to manufacture poplar plywood（250 mm × 250 mm × 4mm） in the laboratory.An orthogonal method was used to design an experiment to investigate effects of the process parameters on plywood bonding performance.Optimal process parameters were the press pressure of 1.4 MPa,press temperature of 165 ℃,pressing time of 1.4 min/mm,and adhesive spread of 220 g/m2.The result showed that the bonding strength of the plywood,after accelerated aging test（4-hour boiling,20-hour drying,and 4-hour boiling）,exceeded the requirement of the Chinese National standard,GB/T 9846-2004,for type I general purpose plywood.关键词：soy-based protein adhesive;differential scanning calorimeter;Poplar;plywood;hot-pressing;bonding strength
- 8
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- 122
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- 8
发布时间：2021-02-08 - 摘要：Better understanding of heat transfer and resin curing during hot pressing will help optimize the wood composite manufacturing process in increasing productivity and improving product quality.Electrical-thermocouples were used in this study to investigate the effects of resin application methods,resin content,hot-pressing temperature,and pressure in hot-pressing poplar laminated veneer lumber（LVL）.The results indicated that during the initial pressing stage,the internal temperature increased more rapidly by using a resin impregnation method than a resin spread method.It was found that higher resin content accelerated heat penetration towards the core.However,the resin content didn’t significantly affect total hot-pressing time.关键词：PF resin;laminated veneer lumber;hot-pressing;heat transfer;resin application methods
- 7
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- 193
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- 12
发布时间：2021-02-08 - 摘要：The surface of wood composites undergoes photochemical degradation when exposed to ultraviolet and sunlight radiation.This degradation is usually accomplished by the negative effects of color instability and visual appearance.In this study,radiation from a Xenon-Lamp Attenuation Instrument was used to accelerate the color fade of Poplar and Scots Pine veneer.During the testing,color characteristics of lightness（L*） and chromaticity coordinates（a* and b*） were monitored periodically.The observations of the decreasing lightness and increasing chromaticity coordinates showed that the surface color of the wood veneer fade when exposed to light radiation.It was found that under the same amount of the light radiation the Scots Pine veneer changed its color more quickly than the Poplar veneer.关键词：Poplar;Scots pine;veneer;color stability;light radiation
- 16
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- 108
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- 25
发布时间：2021-02-08
Research & Development
- 摘要：Selection of the right adhesive plays an important role in manufacturing multi-layer parquet that has the potential to improve product performance and decrease manufacturing costs.One-component,moisture curing polyurethane（PUR） adhesive（100% solids）,was selected and compared with a commonly-used adhesives,emulsion polymer isocyanate（EPI） adhesive in this study.The results indicated that using PUR adhesive could improve bond performance and increase product efficiency.关键词：polyurethane adhesive;emulsion polymer isocyanate adhesive;multi-layer parquet;cost analysis
- 7
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- 191
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- 5
发布时间：2021-02-08 - 摘要：Expanding populations and steady economic growth will continue to increase world energy demand.Wood fuel pellets provide an alternative and cost stable biomass energy and is used widely throughout North America and Europe.Pellets can be made from renewable materials such as agricultural straws,residues from wood or bamboo product manufacturing,and recycled wood.This paper reviews the main characteristics,applications,and manufacturing technology of wood fuel pellets.It also discusses current product developments and future trends in the fuel pellet industry.Finally,it describes the prospect and provides guidance for developing a successful biomass fuel pellet industry in China.关键词：fuel pellet;biomass fuel;agricultural residues;wood residues
- 8
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- 334
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- 15
发布时间：2021-02-08
Discussion & Suggestion
- 摘要：A new wood-bamboo parquet with two layers（3 mm reconstituted bamboo face and 7 mm high density fiber board as its substrate） was developed.An orthogonal experimental design method was used to investigate effects of three processing parameters（press temperature,pressure,and press time） on the performance of the wood-bamboo parquet.It was found that the press temperature was the dominate parameter and had a significant influence on the mechanical and warping performance of the panels.The results showed that after the process was optimized,the modulus of rupture（MOR） and warping performance all exceeded the performance requirements of the Chinese National Standard GB/T 18103-2000 for parquet.关键词：wood-bamboo parquet;hot-pressing technology;orthogonal experiment
- 5
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- 306
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- 15
发布时间：2021-02-08 - 摘要：This paper presents a new air flow control system which provides uniform air circulation for a wood drying process to improve drying efficiency and reduce energy consumption.The control system involves 180° rotation control of rotary fans to reverse the direction of the air flow and air flow control to channel the air through the heaters.The system was installed and compared with a conventional drying system in a commercial lumber mill.The new air control system was found to save up to 60% of the energy cost and reduce the lumber drying time by two days.In addition,the new control system eliminated the conventional air flow device which required an extra 0.5 m of ceiling space.关键词：wood drying kiln;rotary fans;regulating direction and speed;air delivering device
- 9
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- 172
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- 3
发布时间：2021-02-08
Piactical Techniques
- 摘要：分析热处理木材力学性能发生改变的原因及其与热处理工艺条件的关系。通过对桦木热处理工艺的研究,获得优化的工艺参数,即在180℃时,处理时间不宜超过2.5 h;200℃时处理时间不宜超过1 h;应用硼酸钠缓冲溶液浸注木材,可减缓木材热降解程度。关键词：木材热处理;力学性能;影响因素
- 7
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- 580
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- 46
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
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