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专业外语课后阅读第八课page101--111Particleboard.doc


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专业外语课后阅读第八课page101--111Particleboard.DOC8Particleboardpage101…111Particleboardisapanelproductmadebygluingparticlestogether(i•e•smallpiecesofwoodorotherligno一cellulosicmaterial);(startedinthe1940sinGermany),itisadynamicindustry,:(1)thepossibilityofutilizingsmall一dimensionwoodincludingresiduesfromotherwood-usingindustries;(2)availabilityofsyntheticresinsthatfacilitatemassproductionbyfastcuring;and(3)suitabilityoftheproductforavarietyofuses(furniture,buildingconstruction,etc•)•~?(lowerandhigherdensitiesarerare)・Onthebasisofproductionmethodology,particleboardisdistinguishedinto“flatpressecTand“extruded":intheformer,particle-grainorientationisparallelandinthelatterperpendiculartopanelsurfaces・mon;theyaresingle-layerormultilayer(usuallythree-layersometimesfive-layer),butgradedboardsarealsoproduced,-layer.•RawMaterialsWood,adhesives,andadditives(waxtoreducehygroscopicityandsometimesfungicides,insecticides,andfire-retardants),boardsaresometimesmadebyuseofflaxresidues,andthepossibilitiesexisttoutilizeotheragriculturalresidues,suchasstrawandcottonstalks•Adhesi

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