Abstract
Theeffectofparticlesizeandmixingratioofsugi(Cryptomeria血ponicaD.Don)sawdustondensityandontensileandbendingstrengthsofcompositematerialsmadefrompolypropylene(PP)andsugisawdustwasinvestigated.UntreatedsawdustwhichwasclassifiedintosixparticlesizegroupsfromP150(particlespassing100mesh)to850(particlespassing16mesh.retainedat18mesh)wasusedasfillerforthecompositematerial.Itwasrevealedthateventheroughestsugisawdust(particlesize850)couldbeusedasfiller・Asparticlesizeincreased,thedensityandtensileandbendingstrengthsofthecompositematerialsdecreased・WhenmixedwithPPindifferentproportionsofsawdust,itwaspossibletoutilizesawdustofparticlesize150(particlespassing50mesh,retainedatlOOmesh)asfillerataratiooffrom20%to60%.Inthiscase,thedensityofthecompositematerialsincreasedwhentheratioofsawdustincreased.Thetensileandbendingstrengthsofsampleswith20%sawdustwerelowerthanthoseofpurePP・ThestrengthsslightlydecreasedastheratioofsawdustincreasedHowever,thevalueofthetensileandbendingstrengthsofmaterialswitha20%mixedraticandwitha60%mixedratioshowedinsignificantdifferences
