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Heat transfer model of wood veneer mat for hot pressing

Journal of Computational Information Systems 2007年第6期3卷 2389-2393页

作者： Li, Peng Wang, Fenghu Tao, Yubo Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 China

A two-dimensional unsteady mathematic model about heat transfer of wood veneer mat during hot pressing was built according to the energy balance equation. This model describes the temperature variation of a wood with locations and times during hot pressing. The visual numerical solution was obtained by using the PDE tool of MATLAB and the calculated results were verified by experiments. A comparison was made between the calculated temperature curve and the measured temperature curve. The comparison shows that this model is suited for simulating heat transfer of a wood mat and the simulated results can be used to guide of the production of wood-based composites.

关键词： Veneers

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Impact of coupling agent on properties of wood-plastic composite

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中国高等学校学术文摘·林学 2007年第3期2卷 347-349页

作者： XU Min LI Shuai Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry UniversityHarbin 150040China

The impact of two coupling agents, maleic anhydride (coupling agent 1) and isocyanate (coupling agent 2) on the properties of wood-plastic composites (WPC) was studied. Wood-plastic composites were made with coupling agents 1 and 2 and properties were tested under the condition that the ratio of wood fiber to thermoplastic polymer was 7:3, target density was 0.7 g/cm3, press temperature was 175°C, press time was 8 min, and adding amount of coupling agent 2%. Results show that coupling agent 2 was superior to coupling agent 1 and had great effect on the physical and mechanical properties of WPC. When using the same coupling agent, the impact on their properties varied with different thermoplastic polymers. keywords wood fiber - thermoplastic polymer - coupling agent - wood-plastic composite - physical and mechanical properties Translated from China Forest Products Industry, 2006, 33(4): 30–32 [译自: 林产工业]

关键词： wood fiber thermoplastic polymer coupling agent wood-plastic composite physical and mechanical properties

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Applications of wavelet transformation in the nondestructive test of medium density fiberboard

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中国高等学校学术文摘·林学 2007年第2期2卷 227-230页

作者： WANG Fenghu ZHU Xiaodong SUN Jianping Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education Northeast Forestry UniversityHarbin 150040China

Taking medium density fiberboards (MDF) as samples, the feasibility of the applications of wavelet analysis in a nondestructive test is discussed in this paper. The main results are as follows: the modulus of elasticity of longitudinal resonance, measured by wavelet analysis, can replace the conventional static modulus of elasticity. Their correlation coefficient is significant (p < 0.01). The defect of samples can be judged by wavelet analysis, which is superior because it is a nondestructive test. keywords nondestructive evaluation (NDE) - wavelet transformation - medium density fiberboard - modulus of elasticity __________ Translated from Scientia Silvae Sinicae, 2006, 42(10): 91–94 [译自: 林业科学]

关键词： nondestructive evaluation (NDE) wavelet transformation medium density fiberboard modulus of elasticity

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Separation and purification of Arabinogalactan obtained from Larix gmelinii by macroporous resin adsorption

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Journal of Forestry Research 2007年第1期18卷 81-83页

作者： HUANG Zhan-hua FANG Gui-zhen ZHANG Bin Northeast Forestry University Key Laboratory of Bio-based Material Science and Technology Ministry of Education Harbin 150040 P. R. China

Arabinogalactan （AG） obtained from Larix gmelinii R. waS purified with the method of macroporous resin adsorption. Effects of various parameters on the adsorption, including adsorption time and temperature, the concentration and the dosage of raw AG the reused numbers of resin, were investigated. The effect of purification was tested through the removal rate of impurity and the contents of AG and impurity. The optimal condition was determined as follows： adsorbed at 30℃ for 2 h with the concentration of raw AG 〈0.1 g·mL^-1 and its dosage 〈 7 mL, the dose of resin was 3 g and reused for 4 times. On the basis of these, macroporous resin column was used for AG purification. The result showed that the AG yield could reach 68.28% with sugar content of 95.02%. The analysis of IR and UV showed that the effect of macroporous resin characteristics on the purification of AG was significant. The obtained product had the same functional groups with standard sample.

关键词： Arabinogalactan Larix gmelinii R. Macroporous resin

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Application of image processing programs for OSB research

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Journal of Computational Information Systems 2007年第2期3卷 733-738页

作者： Li, Peng Wang, Fenghu Chen, Siguo Wang, Sunguo Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 China Forest Products Business Unit Alberta Research Council Edmonton Alta. T6H 1E4 Canada

The authors introduced four MATLAB image-processing programs for orientated strand board (OSB) research. These programs have been used to detect OSB panel voids, to characterize voids within the simulated mat, and to transform the distorted images from the X-ray scanning system and Infrared system. The successful running of these programs showed that the primary programming codes were compact and efficient, and that image processing programs can be used for different applications in OSB research, including panel and mat voids measurements as well as image transformation. By means of simple modifications it is possible for the programs to fulfill more complex image processing procedures than the examples specified in this paper. These programs and their program design principles can be directly utilized as a reference in research and teaching, especially for image analysis of composite panels and/or mats.

关键词： Image analysis

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Effect of maleic anhydride grafted styrene-ethylene-butylene-styrene （MA-SEBS） on impact fracture behavior of polypropylene / wood fiber composites

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Journal of Forestry Research 2007年第3期18卷 203-207页

作者： GUO Chui-gen WANG Qing-wen MOE Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 P. R. China

MA-SEBS as compatibilizer and impact modifier was incorporated into Polypropylene/Wood Fiber （PP/WF） to enhance interface adhesion and impact strength of the composite. The effect of MA-SEBS content on the impact fracture behavior of PP/WF composites was studied. The impact properties of composites with 8% MA-SEBS reached the maximum value. And further increasing of MA-SEBS content to 10% did not improve the fracture toughness, but improved the stiffness of composites by DMA analysis. This was attributed to the improved PP/WF adhesion. As the MA-SEBS content is more than 8%, the molecule interaction of PP and WF was expected to much stronger than lower MA-SEBS. Scanning electron microscopy （SEM） was performed to analyze the impact fracture surface and showed a stronger affinity for the wood surfaces.

关键词： Polypropylene Wood fiber/polypropylene composites Fracture behavior Impact test

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Comparison Study on Self-Calibration Level Fusion Algorithm with Bayes Estimation Theory for Wood Drying Kiln Industry Process

Comparison Study on Self-Calibration Level Fusion Algorithm ...

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IEEE International Conference on Mechatronics and Automation

作者： Jun Cao Jiawei Zhang Yixing Liu School of Electromechanical Engineering Northeast Forestry University Harbin Heilongjiang China Key Laboratory of Bio-Based Material Science and Technology Northeast Forestry University Harbin Heilongjiang China

Since the complex operation environment in wood drying kiln, the precision of lumber moisture content (LMC) is affected greatly with the ambient parameters which have closed multi-couple and correlated relation with them. based on above reasons background, a comparison study on self-calibration level fusion algorithm based Bayes estimation theory for wood drying-kiln industry process is presented in this paper. Starting with analyzing the existing problems of LMC measured by individual sensor, we then put forward the architecture of multi-sensor data fusion for LMC measuring system. The performance of self-calibration level is detailed discussed. The technique of the determination of confidence distance and optimal fusion set, the total probability maximum algorithm, the Bayes estimation algorithm, and arithmetic averaging method are investigated respectively. Comparison the simulation results, a self-calibration fusion algorithm based Bayes estimation theory is determined.

关键词： Estimation theory Kilns Cement industry Wood industry Sensor phenomena and characterization Moisture Sensor fusion Automation Forestry Industrial relations

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Analysis of compounds in dichloromethane extractives for Sawara Falsecypress （Chamaecyparis pisifera） outer heartwood

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Journal of Forestry Research 2007年第3期18卷 208-212页

作者： NIU Jing LIU Zhi-Ming WANG Xiang-Ming XU You-Ming WANG Qing-Wen Key Laboratory of Bio-based Material Science and Technology Ministry of Education P.R. China Northeast Forestry University Harbin 150040 Forintek Canada Corp. Quebec QC Canada GIP 4R4 Huazhong Agricultural University Wuhan 430070

The chemical components of dichloromethane extractives for Sawara Falsecypress heartwood were analyzed with GC/MS except for basic chemical composition analysis for heartwood with Chinese standard method. 14 kinds of compounds were idenfifjed according to the computer compounds library data. The major compounds in dichloromethane extractives comprised of terpene and naphthalene derivafives. The experiments of antifungal effects of the dichloromethane extractive on Aspergillus niger were also carded out. The result showed that the dichloromethane extractive from Sawara Falsecypress has no or weak antifungal capability.

关键词： Chamaecyparis pisifera Sawara Falsecypress Outer heartwood Dichloromethane extractives GC/MS Antifungal

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Discoloration and color’s reversion of Scot pine veneers by resin-eliminated treatment

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Journal of Harbin Institute of technology(New Series) 2006年第6期13卷 723-726页

作者：郭明辉宋魁彦房敏 Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University

The discoloration of Scot pine （Pinus sylvestris var. Mongolica） veneers caused by resin-eliminated treatment and the reversion of the color were studied. The result showed that the color of the veneers changed from buff to yellowish brown after the treatment of resin elimination and the discoloration of heartwood was more severe than that of sapwood; the degree of discoloration was significantly positively correlated with the medicament strength, temperature and resin-eliminated duration. The variance analysis showed the effects of those three factors on the discoloration were significant. With hydrogen peroxide （H2O2） as color reversion medicament and inorganic compound as medium of the reaction, the reversion of the color of heartwood was more inaccessible than that of sapwood; the degree of the color’s reversion was positively correlated with the H2O2 strength, temperature and treating time; the H2O2 concentration has significant effects on the discoloration. In order to reduce discoloration of Scot pine veneers, medicament of resin-eliminated used have to be at some low concentration, and the optimal concentration of H2O2 is 0.35% during the process of color’s reversion.

关键词： Scot Dine veneer resin elimination descoloration

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Study of drying of small diameter Larch lumbers with intermittent heating

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Journal of Harbin Institute of technology(New Series) 2006年第4期13卷 431-434页

作者：郭明辉赵西平 Key Laboratory Bio-based Material Science and Technology Northeast Forestry University

Intermittent heating for drying of small diameter Larch lumbers is investigated experimentally. The lumbers were dried using an experimental drying schedule. Moisture content (MC) of the lumber was continuously recorded and final drying defects were examined. The drying curves showed that the drying rate was a constant in the early stage of intermittent heating drying and decreased evidently when the MC was about 18% (intermittent 2h) and 20% (intermittent 6h). The drying quality reached the second (intermittent 2h) and first grade (intermittent 6h) of the Chinese National Standard. The visual drying defects, especially the check extent along grains were reduced with intermittent heating. When the intermittent time increased, the effect was more obvious.

关键词： small diameter lumber Larch intermittent heating drying curve drying quality

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