最新刊期
      期 0 ， 2020
      • Zhang Yisheng Long Ling Chen Shiying
        Issue 6, Pages: 3-6(1999) DOI: 10.19455/j.mcgy.1999.06.001
        摘要：This paper discusses blending properties of gypsum fiberboard (GFB) by semi dry process. 4 kinds of blending were examined by means of surveying the granule size of admixture, testing moisture content ( MC ), scanning electron microscopy (SEM), etc. The results showed that for semi dry process, 3 kinds of blending methods were available in which the side effects of airflow blending method was lowest. The granule size of admixture played a central part in the bending strength of GFB, the bigger the granule size of admixture, the lower MOR of GFB. The admixture homogeneity depended upon both ratio of water/gypsum ( H/G ) and ratio of wood/gypsum ( W/G ) which could be described by k function.  
        关键词：Gypsum fiberboard (GFB);Semi dry process;Blending;Homogeneity   
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        发布时间：2021-03-12
      • Xing Cheng Yin Suzhou Deng Yuhe
        Issue 6, Pages: 7-9(1999) DOI: 10.19455/j.mcgy.1999.06.002
        摘要：Low density particleboard was produced from soybean stalk using urea formaldehyde (UF) resin as adhesive under laboratory conditions. The influences of three processing variables, i.e . density, resin consumption and pressing time on physical and mechanical properties of the board were analyzed. Results showed that soybean stalk was a suitable raw material for low density particleboard. The main physical and mechanical properties of the board can reach the requirements of JIS A 5908. Overlaying with melamine impregnated paper or veneer can greatly improve MOR of the board.  
        关键词：Soybean stalk;Low density particleboard;Physical mechanical properties   
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        发布时间：2021-03-12
      • Wu Yuzhang
        Issue 6, Pages: 10-12(1999) DOI: 10.19455/j.mcgy.1999.06.003
        摘要：This paper discusses the differences between oxygen index ( OI ) of wood on vertical and transverse section by four wood species with five fire retardants. The results showed that the OI of vertical section was lower than that in transverse section because wood is anisotropy and coefficient of heat conduction is different in different direction .But there was no obvious difference on radial and tangential section since the radial section is similar to tangential in structure. The effect of wood species on OI of wood was different, high density wood had a greater OI . With fire retardant treatment, the OI of vertical section could be higher than transverse section. The effect of same retardant on different wood species was different.  
        关键词：Oxygen index( OI );Anisotropism;Fire prevention;Structure feature   
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        发布时间：2021-03-12
      • Duan Xinfang
        Issue 6, Pages: 13-15(1999) DOI: 10.19455/j.mcgy.1999.06.004
        摘要：Chitosan is a natural and renewable polymer extracted mainly from crabs and shrimps without toxic and pollution to human beings and environment and can be used to the wood surface modification such as wood dyeing and clear painting.But the information of changes of color characteristics of wood painted with chitosan is absent.In this paper the color characteristics of unpainted and painted wood with aqueous solution of chitosan at 0 5,1 0,1 5,2 0,2 5 and 3 0% concentration for sapwood of Chinese Fir (Cunninghamia lanceolata ) and Chinese White Poplar (Populus tomentosa) ,heartwood of Chinese Fir were measured and analyzed.The results showed that all the color difference went up as the concentration of an aqueous solution of chitosan painted wood increased while the other parameters vary little between unpainted and painted wood.2% of an aqueous solution of chitosan is the best concentration for wood dyeing or clear painting with no influence to further surface treatment.  
        关键词：Cunninghamia lanceolata;Populus tomentosa;Treatment with chitosan;Wood color   
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        发布时间：2021-03-12
      • Huang Luohua Qin Tefu Zhou Qin
        Issue 6, Pages: 16-18(1999) DOI: 10.19455/j.mcgy.1999.06.005
        摘要：The pH values and buffering capacities for 10 plantation woods were investigated. The results were as following: 1)there was a slight difference among the pH values of plantation woods, while a significant difference among the buffering capacities, the pH values in 10 plantation woods ranged from 4 to 5, however the pH value of Populus nigra ×P.simonii Carr.cv.‘Zhonglin Sanbei-1’(Poplar Sanbei No.1) was above 7; 2)the acid buffering capacities in the softwoods changed between 3 and 7, however the acid buffering capacities of heartwood in Pinus taeda was above 8, the acid buffering capacities in 3 hardwoods were between 0 2 and 30; 3) the base buffering capacities in the softwoods was between 2 and 8, but in the heartwood of Pinus taeda was above 8 only. the buffering capacities in 3 hardwoods was between 3 and 34;4) the pH value was lower in juvenile woods than in mature woods for most plantation woods, but in ‘Poplar Sanbei No.1’ the pH value decreased with growth rings increased.  
        关键词：Plantation wood;Juvenile wood;Mature wood;pH;buffering capacity   
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        发布时间：2021-03-12
      • Yan Haopeng Qin Tefu
        Issue 6, Pages: 19-21(1999) DOI: 10.19455/j.mcgy.1999.06.006
        摘要：In this report, the graft copolymerization of 1 penylethene and the main composites of two wood species of Chinese Fir ( Cunninghamia lanceolata) and Poplar ‘Sanbei No.1’ ( Populus nigra × P. simonii were investigated. The results showed: wood could graft copolymer with 1 phenylethene, the grafting reaction was between 1 phenylethene and lignin? while cellulose and hemicellulose did not take part in the reaction. The graft copolymerization of wood decreased the critical surface tension of the wood, thus it was a useful method of wood surface non polarization.  
        关键词：Graft copolymering;Chemical functional group;Critical surface tension;contact angle   
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        发布时间：2021-03-12
      • Jin Juwan Hua Yukun
        Issue 6, Pages: 22-24(1999) DOI: 10.19455/j.mcgy.1999.06.007
        摘要：The important mat property which determines the final product quality and profitability is uniformity. Horizontal density variation (HDV) is a common index which represents the mat uniformity. This paper presents the technical factors which influence the HDV and the effect of HDV on some board propert ies.  
        关键词：Horizontal density variation(HDV);Flakeboard property;Technical factors   
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        发布时间：2021-03-12
      • Lu Bin Zhou Meijian Tang Zhaoqun
        Issue 6, Pages: 25-26(1999) DOI: 10.19455/j.mcgy.1999.06.008
        摘要：Based on the test data and information maintained by the author, this paper deals with the characteristic and quality requirement of container plywood flooring.  
        关键词：Container plywood flooring;Characteristic;Quality requirement   
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        发布时间：2021-03-12
      • Zhang Qun
        Issue 6, Pages: 27-30(1999) DOI: 10.19455/j.mcgy.1999.06.009
        摘要：In this paper the design of several unloading systems of wood based panel press is expounded.  
        关键词：Hot press;Unloading system;Unloading curve   
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        发布时间：2021-03-12
      • Cao Zhongrong Qu Yanchun
        Issue 6, Pages: 31-33(1999) DOI: 10.19455/j.mcgy.1999.06.010
        摘要：After completing a technology study on the manufacture of medium density fiberboard (MDF) from Slash Pine( Pinus elliottii )at the laboratory,a pilot scale trail was conducted on the production line with an annual capacity of 15 000 m 3 to improve and examine further technological parameter.The results showed that the physical and mechanical properties of Slash Pine MDF made with 10% UF resin consumption could achieve the requirement specified by Chinese National Standard GB 11718.2 89 and America National Standard for MDF.Therefore,the technological parameter used for the pilot scale trail was suitable and feasible.  
        关键词：slash pine;MDF;Pilot scale trail   
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        发布时间：2021-03-12
      • Zheng Kaizhen
        Issue 6, Pages: 34-36(1999) DOI: 10.19455/j.mcgy.1999.06.011
        摘要：There are some obviously different points between medium density fiberboard(MDF) hot pressing technology by continuous press and multi opening press.How to recognize correctly the differences and how to control reasonably pressing technology data are the key points to master production control of continuous pressing and guarantee reasonable structure and excellent performance of MDF board quality.This paper is specializing in the controls of main pressing technology data according to the above mentioned principle.  
        关键词：MDF;hot-pressing technology;Continuous pressing   
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        发布时间：2021-03-12
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