最新刊期
期 0 ， 2020
- 摘要：Heat treatment is a way of drastically changing wood properties.Heat-treated lumber has been studied and produced in large scale overseas during the last decade.In this paper,the research and development of lumber heat-treating technologies are reviewed from research backgrounds,processing procedures,to the prospects of its utilization.The data shows that after heat-treatment,the dimensional stability of lumber is greatly improved,the EMC is reduced,and the weather resistant properties and durability to biodegradation are enhanced.The research and application of heat-treated lumber techniques will promote the utilization of plantation grown wood.关键词：plantation grown;lumber;heat-treated;dimensional stability;EMC
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发布时间：2021-02-08 - 摘要：Fiberboards and particleboards were manufactured under different parameters with the hydraulic oil pressure recorded online during hot-pressing.Various factors were analyzed from the press-time curves obtained from hot-pressing temperature,panel thickness,panel density and mat moisture content conditions.The data that was collected documented panel stress during the hot-pressing process.关键词：fiberboard;particleboard;hot pressing;stress
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发布时间：2021-02-08 - 摘要：The technique for preparing phenol formaldehyde（PF）resin from liquefied wood was studied and its physico-chemical property and bond quality were characterized.The results showed that the operation procedure was simple by adding formaldehyde totally at the beginning of the reaction.The residue in the liquefied product affected the property of resin from liquefied wood.When the residue content was high,the property of the resin from liquefied wood with residue was very different from that of resin from liquefied wood without residue.When the molar ratio of formaldehyde to phenol was 1.5 and 1.8,satisfactory resin was prepared from liquefied Chinese Fir with 11.0% residue content and from liquefied Poplar with 16.5% residue content.关键词：liquefied product;resinification;physico-chemical property;bond quality;PF resin
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发布时间：2021-02-08 - 摘要：The durability of ACQ,copper citrate（CC）,Chlorothalonil and CCA treated Masson Pine,Slash Pine and Poplar were tested at a typical sub-tropical area in Guangdong province in Southern China.The results showed that not all preservative-treated Poplar could be used in ground contact circumstances,and neither could Chlorothalonil be used for ground contact conditions at a retention of 6.4～8.5 kg/m3.ACQ-B and CC treated Slash Pine,under the same retention level,had almost equivalent effect for preventing decay and termite infestation.The stakes of Masson Pine and Slash Pine,treated by ACQ-B and CC at a retention of 6.0～6.8 kg/m3 in a 6-year-test,exhibited good resistance for decay and fare resistance for termites;while that treated by ACQ-B,CC and CCA,around a retention of 10 kg/m3,have extremely fine resistance for decay and termites after the 6-year test.关键词：ACQ;copper citrate;chlorothalonil;Masson Pine;slash pine;Poplar;durability
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发布时间：2021-02-08 - 摘要：This paper introduces the development of a timber management and marketing system for wood producers and distributors.It emphasizes system design,functional analysis and database creation.The system is completed with data input,query,statistics,analysis,report printing and accounting.With the help of the system,various data related to timber sale and distribution can be managed scientifically and effectively.关键词：Timber;marketing;Database;management system;FoxPro
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发布时间：2021-02-08 - 摘要：Free radicals play a key role when wood is activated by laccase to gain self-adhesion.The relative intensities of reactive oxygen species（ROS）free radicals generated when woodflour was incubated with laccase at different pH values,incubation temperatures,dosages of laccase,periods of incubation and wood species were investigated.The effect of these factors on the relative intensities of ROS free radicals was analyzed and discussed.The results showed that there was an extraordinarily significant difference in the relative intensities of ROS free radicals at different factorial levels.The optimum value was reached when the woodflour of Pinus kesiya heartwood was treated for 4 hours of incubation,pH 4,enzyme dosage of 1.5 U/g woodflour and incubation temperature of 60℃ were used.The current research lays the theoretical foundations of the upcoming optimization of processing parameters for the manufacture of fiberboards by laccase-catalyzed oxidation of wood fibers.关键词：reactive oxygen species free radicals;wood;Laccase;szemao pine;beautiful sweetgum
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发布时间：2021-02-08 - 摘要：The process of collection and management of wood specimen was described in this article.Based on the collection and digitalization of wood specimen information collected by Research Institute of Wood Industry（CRIWI）of Chinese Academy of Forestry（CAF）,a network for the wood herbarium was designed.The whole digital processing of the wood information（tree name,faculty name,genus name and the collection area,etc）,and establishment of the web site were presented.关键词：wood herbarium;collection;management;network design;topology
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发布时间：2021-02-08 - 摘要：A series of experiments were conducted to evaluate how the formaldehyde concentration indoors could be affected by some environmental conditions.The factors to be tested included the formaldehyde emission of panel materials,panel setting coefficient（panel quantity to room volume）,times of air exchange,and indoor temperature and humidity.Results found that under the current panel setting coefficient of 0.6 m2/m3 and environmental conditions,to make the indoor formaldehyde concentration of a room attain ≤0.10 mg/m3 or ≤0.08 mg/m3,the formaldehyde emission of panels should be less than 0.5 mg/L and 0.3 mg/L respectively.关键词：formaldehyde concentration of indoor-air;wood-based panel;formaldehyde emission;environmental condition
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发布时间：2021-02-08 - 摘要：The moisture diffusion coefficient of bamboo timber during hot-pressing drying was measured and analyzed by a non-balance method and the effect of temperature on the moisture diffusion coefficient was evaluated.The results showed that the moisture movement was mainly controlled by both temperature gradient and moisture gradient.The higher the drying temperature was,the bigger the moisture diffusion coefficient was at every drying stage.The moisture diffusion coefficient was increased at the early drying stage when the moisture content was high,and hit the maximum value when the moisture content drew close to the fiber saturation point,and then decreased gradually as the moisture content decreased.关键词：bamboo timber;hot-pressing drying;moisture diffusion coefficient（MDC）
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发布时间：2021-02-08 - 摘要：To find a new way of making full utilization of recycled office wastepaper,the authors made experiments to determine the feasibility of using it for making paper chipboard.They conducted an orthogonal experiment to analyze the effect of UF resin consumption,as well as hot-pressing time,pressure and temperature on the board’s mechanical properties.They also chose two kinds of pulps,CTMP and bamboo semi-chemical pulp,as reinforcing fiber to be added to the chips to improve the board properties.The results showed that when adding 30% bamboo semi-chemical pulp（to the absolutely dry chips）,15% resin,pressing temperature of 170℃,and pressure of 8 MPa for 480 seconds,the resulting MOR,MOE and IB values met the requirements of the national standard for particleboard.关键词：office wastepaper chip;paper chipboard;urea formaldehyde resin
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发布时间：2021-02-08 - 摘要：In this paper,current economic conditions for the MDF and HDF industries in China are summarized.An analysis was made of MDF/HDF manufacturers in Guangdong Province and of a large number of references.Further development trends are predicted for the industry as well.关键词：MDF;HDF;development trends
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发布时间：2021-02-08 - 摘要：This article first reviewed the harmful effects of formaldehyde to the human body,and analyzed the origins of formaldehyde from wood-based panels.Then,the conventional ways that have been used to decrease the emission of formaldehyde from wood-based panels are summarized.Finally,a systematic solution for formaldehyde reduction,that was developed by the authors,was presented.The application of this system by three different companies verified it was an effective way to reduce formaldehyde.The panels from these companies meet the demands for level E1 or E2 with regard to formaldehyde emission.关键词：wood-based panels;UF resin;formaldehyde emission content;harm;measure
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发布时间：2021-02-08 - 摘要：The authors made an experiment to bond plywood veneer using modified UF resin.They observed how the bonding performance of the resin could be influenced by the pH value,wheat flour addition and plywood assembly time.The authors found that following a decrease in pH,the bonding strength for the plywood,after both pre-pressing and hot-pressing,was improved,but the curing time and work life of the resin was reduced,and formaldehyde emission decreased.The quantity of flour greatly affected the viscosity of the UF resin,while increasing the flour was harmful for the bonding strength and formaldehyde emission,though it might improve the prepressing bonding strength.The most effective parameters were pH 4.5 and the addition of 20% flour.关键词：UF resin;mixture;pH;bonding performance;prepressing;formaldehyde emission
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发布时间：2021-02-08 - 摘要：Historically up until now,research practice,as well as experienced drying methods,has usually used 100℃ to establish wood drying schedules.But to some extent,this way lacks scientific method and it is not reasonable for some species,especially some imported wood and southern hardwood.Therefore,it is imperative to develop a method for establishing wood drying schedule.This article presents a new method which breaks through the old drying schedule of drying for a long time and proposes that the establishment of a drying schedule should be based on wood properties.关键词：schedule;Wood properties;drying
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发布时间：2021-02-08 - 摘要：Collapse and huge moisture content（MC）differences among boards are the main defects during Eucalypt lumber air drying.Therefore,a drying strategy,including pre-steaming before kiln drying and final conditioning after kiln drying,was developed by the authors with the intent to improve lumber drying quality.An experiment on Eucalyptus camaldulensis lumber with thickness of 30 mm showed the following:pre-steaming could help lumber collapse recover effectively and decrease casehardening significantly;mean MC decreased from 25.61% to 11.72% during a 5 day drying period;both a 3-hour steaming and 24-hour wet-air conditioning could decrease MC gradient and release residual plastic set,while the effects of the latter were better;and the drying quality in this test met the demands of the second quality level in national standard GB/T 6491-1999.关键词：pre-air-dried Eucalyptus camaldulensis lumber;pre-steaming;final conditioning;drying quality
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发布时间：2021-02-08 - 摘要：The authors made research improvements on the manufacturing technology for coal-ash cement particleboard.Using ordinary cement（#32.5）,they conducted a series experiments to evaluate the most dominate factors and their levels,to ensure the best properties from coal-ash cement particleboard.Through analysis of the results,optimum parameters for the proportion of coal-ash substituted for cement,additive usage,board density,ratio of water and coal-ash to cement,were determined.关键词：semi-dry processing;coal-ash;Cement particleboard;production technology;physical and mechanical properties
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发布时间：2021-02-08 - 摘要：蓝帜刀具,以其卓越的技术和精湛的品质,成为世界刀具市场的旗舰品牌。在2006年5月的第20届Xylexpo／Sasmil（国际木材加工机械与技术展暨家具、装饰材料与半成品展览会）上,蓝帜再次以其蓝色经典形象,鲜明地成为展会中的奇葩。当笔者驻足蓝帜展台时,有幸见到了公司总裁Dieter Brucklacher博士（见本期封面）。就蓝帜公司近年来的成就,以及未来如何巩固和超越自身发展等问题,Dieter Brucklacher博士再次接受了本刊的采访。
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发布时间：2021-02-08
- Address：Box 29，Research Institute of Wood Industry, No. 1, Dongxiaofu, Haidian District, Beijing Postal code：100091
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