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1、第27卷第5期北京林业大学学报Vol.27,No.52005年9月JOURNALOFBEIJINGFORESTRYUNIVERSITYSep.,2005人造板含水率对游离甲醛释放量的影响龙玲陆熙娴(中国林业科学研究院木材工业研究所)摘要:该文采用干燥器法和穿孔法,分析了板材含水率变化对干燥器值和穿孔值的影响规律.结果表明,含水率对不同种类板材干燥器值的影响有较大不同,但干燥器法受试件含水率影响较小.对于刨花板和中密度纤维板,含水率的影响规律基本相同,即含水率从4%到9%,干燥器值随含水率增加呈对数增加;含水率
2、从9%到13%,干燥器值比较稳定;而含水率从13%到15%,中纤板的干燥器值迅速下降.对于饰面中纤板,干燥器值与含水率呈现较好的二次函数关系.对于细木工板和胶合板,干燥器值随含水率增加呈指数曲线增加.若采用干燥器法检测甲醛释放量,检测应对板材进行含水率平衡处理,即中纤板和刨花板的含水率约9%～13%,饰面中纤板含水率约7%～9%.含水率对穿孔值的影响非常显著,含水率从3%到16%,穿孔值随含水率增大呈线性增加;在含水率为3%～13%的范围内,穿孔值采用含水率修正系数是有效的.关键词:含水率,甲醛释放量,干燥器
3、值,穿孔值中图分类号:TS65313文献标识码:A文章编号:1000221522(2005)052200982205LONGLing;LUXi-xian.Effectsofmoisturecontentofwood2basedpanelsonformaldehydereleases.JournalofBeijingForestryUniversity(2005)27(5)9822102[Ch,17ref.]ResearchInstituteofWoodIndustry,ChineseAcademyofFore
4、stry,Beijing,100091,P.R.China.Theinfluenceofmoisturecontent(MC)onformaldehydeemissionfromwood-basedpanelwasanalyzedbyusingdesiccatorandperforatormethods.TheresultsshowthattheeffectsofMCondesiccatorvaluesfordifferentkindsofpanelsareobviouslydifferent,butthei
5、nfluenceofMCbythedesiccatormethodisnotobvious.ForparticleboardandMDF:ifMCiswithin4%229%,formaldehydeemissiongraduallyincreaseslogarithmicallywithMCincreasing;ifMCwithin9%2213%,formaldehydeemissionalmostkeepsconstantly;ifMCwithin13%2215%,formaldehydeemission
6、decreasesswiftlywithMCincreasing.Ontheotherhand,fordecorativeMDF(DMDF),aconicrelationshipexistsbetweenformaldehydeemissionandMC.Forblockboardandplywood,whenmoisturecontentiswithin6%2214%,formaldehydeemissionincreaseslinearlywithMCincreasing.Ifformaldehydeis
7、measuredbydesiccatormethod,forparticleboardandMDF,MCshouldbecontrolledwithin9%2213%,whileMCofDMDFshouldbewithin7%229%.Ontheotherhand,theeffectsofMConperforatorvaluesareobvious.WhenMCiswithin3%2216%,perforatorvalueincreaseslinearlywithMCincreasing.Itiseffect
8、ivetoapplytheMCcorrectionfactortotheperforatorvaluewhenMCiswithin3%2213%.Keywordsmoisturecontent,formaldehyderelease,desiccatorvalue,perforatorvalue3人造板在生产和使用过程中释放出的游离甲的甲醛检测方法有穿孔法、干燥器法和1m气候室醛,严重污染大气环境,
