最新刊期
期 0 ， 2020
- 摘要：Tubular particleboard panel which is made through extrusion method,has been increasingly visible in the market due to excellent strength-weight ratio and raw material savings.The objective of this study was to optimize the manufacturing process for producing tubular particleboard with E1 grade performance.The processing factors selected in this study included resin content,the amount of formaldehyde scavenger,extruding temperature,and extruding speed.The results showed that the optimal manufacturing parameters for producing E1 grade particleboard were 5% resin content,2% addition of formaldehyde scavenger,160 ℃ extruding temperature,and 0.35 m/min extruding speed.The formaldehyde emission of the particleboard was 8 mg/100g.关键词：E1 grade;tubular particleboard;optimization;processing parameter
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发布时间：2021-02-08 - 摘要：At a given drying condition,the water diffusion rate is usually determined by the size of lumber.In this study,the effect of the dimensions of poplar lumber specimens on the drying speed during vacuum drying was investigated.Specimens with different sizes and length-width ratios were divided into edge-sealed and unsealed（control） groups.Drying conditions under a constant vacuum of 0.02 MPa and temperatures of 45,65 and 85 ℃ were selected.The results showed that the critical dimension for Poplar increased when the drying temperature increased and decreased when the ratio of side area to volume decreased.关键词：vacuum drying;critical dimension;drying rates;poplar lumber
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发布时间：2021-02-08 - 摘要：Glulam comprised of wood laminations has been used extensively for residential and commercial construction applications.The objective of this study was to optimize manufacturing process for potential glulam products using plantation lumber of Chinese Fir.Water based polymeric-isocyanate adhesive was used in this study.Processing factors including pressure,adhesive spread rates,and the amount of additive were investigated.The results indicated that optimal parameters were: pressure=0.8 MPa,adhesive spread rate on both sides=250 g/m2,and additive percentage=10%（oven-dry weight of the adhesive）.关键词：glulam;glue technology;gluability;plantation;Chinese Fir
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发布时间：2021-02-08 - 摘要：To increase the yield rate of quarter sawn lumber,a double-circular sawing technique was developed and fully described in this paper.This technique included a scanning system to determine the configuration of a log（size and section information）,computer software to optimize the sawing patterns based on the scanning information,and double-circular saws to cut the log according to the optimized pattern.Compared with the traditional band sawing method,the double-circular sawing technique improved the productivity and the lumber yield rate.关键词：double circular sawing;trapezoid sawing;quartersawn board;yield rate of lumber
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发布时间：2021-02-08
Research & Development
- 摘要：In order to protect the environment and people’s health,the California Air Resources Board（CARB） established an Airborne Toxic Control Measure（ATCM） to reduce formaldehyde emissions from woodbased panels and wood-related products.This paper introduced the background for the standard development,applicable scope,and formaldehyde emission standard requirements.Different testing methods for formaldehyde emission level were compared.The paper provided some basic information for manufacturers,distributors,importers,fabricators,retailers,and third party certifiers to meet ATCM requirements.关键词：formaldehyde emissions;chamber method;wood-based products;third party certification
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- 83
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发布时间：2021-02-08 - 摘要：Sustainable management of the forest resources and promotion of green forest products have been critical issues in China for the development of forestry and forest products industries.The author believes that the current policy of the utilization of forest resources needs to take into account the supply chain of localized raw materials.The results of this paper could provide valuable suggestions for a future policy to improve China’s wood resource utilization and add value to the forest resources.关键词：forest;forest products industry;policy;resource;wood-based panel
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发布时间：2021-02-08 - 摘要：Direct and indirect uses of forest resources are the two most common ways to make wood products.Direct use of forest resources to make wood products（i.e.,solid lumber） reflects nature-based factors while the indirect use of forest resources to make wood-based products（i.e.,wood composite panels） reflects human being-based and technology-based factors.Two different ways of using wood show different values of society and economy.The author thought that it was important to adopt a correct social attitude towards wood utilization.关键词：wood;direct use;indirect use;consideration
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- 204
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发布时间：2021-02-08 - 摘要：The similarities and differences of visual grading rules of dimensional lumber between the Chinese and Canadian standards were discussed in this paper.A visual grading test was conducted on plantation grown Chinese Fir dimensional lumber according to the Canadian standard.Based on the results,suggestions were made to revise the current Chinese visual grading rules for plantation grown lumber.关键词：dimensional lumber;visual grading rules;plantation grown Chinese Fir lumber
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发布时间：2021-02-08 - 摘要：In this paper,the JG/T 199-2007 testing method for evaluating physical and mechanical properties of bamboo products used in buildings was analyzed and compared with the national standard GB/T 15780-1995 for evaluating physical and mechanical properties of bamboo products.The historical development,sample preparation,instruments,and testing methods of both standards were presented.The objective of this paper was to provide suggestions and guidance for a potential reversion of GB/T 15780-1995.关键词：bamboo;standard testing methods;physical and mechanical properties;construction industry
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发布时间：2021-02-08 - 摘要：Straw-based panels,which are made from the agricultural residuals,have been considered as alternative and supplemental products to the increasing market demand for wood-based panels in China.However,slow infrastructure development and inadequate market information have resulted in the increase of manufacturing costs.These high costs have made straw-based panels less attractive and competitive in the panel market.To solve these problems,the authors proposed to establish virtual industry clusters for the industry.This study described the idea and concept of virtual industry clusters and how to organize these clusters.关键词：straw;straw-based panel;virtual industry clusters
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- 7
发布时间：2021-02-08
Discussion & Suggestion
- 摘要：In this paper,the authors presented the need and impact to upgrade the control technology for a domestic wood-based panel production line equipped with an advanced automatic control system.The authors also analyzed the control system for an MDF production line with a capacity of 80000 m3/a and concluded that the distance-time control method was one of the key technologies to improve the quality stability of an MDF multi-layer press line.关键词：medium density fiberboard;automatic control;multi-layer press;distance-time control
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发布时间：2021-02-08 - 摘要：After analyzing common quality problems and their causes in HDF/MDF production using a continuous press,this paper provided solutions to improve the product performance.关键词：high / medium density fiberboard;continuous press;quality control
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发布时间：2021-02-08 - 摘要：In order to stabilize hot platens,reduce a pre-curing layer of panels,and ensure a uniform panel density and thickness,a simultaneous closing device for a down-stroking multi-opening press was developed.The detailed design and principle operation of the device were described and illustrated.The device was validated in the field and it was believed to improve the quality of pressed panels.关键词：simultaneous closing device;multi-opening press;press cylinder;down-stroking
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发布时间：2021-02-08 - 摘要：The precision of the measurements of dry and wet-bulb temperature,wood moisture,and relative humidity in a wood drying kiln were evaluated.Several factors including temperature sensors,moisture sensors, measuring circuit,and personnel errors were considered to have effects on the precision of the system and were analyzed.The results indicated that adaptation of correct measuring devises,including both hardware and software,were key to solving the problems that influenced lumber drying precision.The precise determination of temperature,moisture level,and humidity could improve wood drying quality and reduce drying costs.关键词：drying control system;sensor;measuring precision;measure
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- 82
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- 0
发布时间：2021-02-08
Piactical Techniques
- 摘要：根据定期的生产检测结果,分析WR100型石蜡乳液代替熔融石蜡,对中/高密度纤维板材主要物理力学性能和生产成本的影响。结果表明,石蜡乳液代替熔融石蜡使用,对板材主要物理力学性能无不良影响,且板材的吸水厚度膨胀率更小,可节省石蜡成本30%以上。关键词：纤维板;石蜡乳液;熔融石蜡;物理性能;成本
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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
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