Classification of Dust - proof Mask Filter Cotton Materials and Their Filtration Performance

    Dust-proofmaskfiltercottonismainlyusedtofiltersubstancessuchasdustintheenvironment.Accordingtothematerial,thefiltercottoncanbeclassifiedintonon-wovenfabric,syntheticfiberfiltercotton,activatedcarbonfiltercotton,etc.Accordingtothenationalstandard,itcanbedividedintothreetypes:primaryefficiency,mediumefficiency,andhighefficiency.
    1.SyntheticFiberFilterCotton
    Syntheticfiberfiltercottoncancomprehensivelyreplacenon-wovenfabricandglassfiberinordinaryfilteringenvironments,coveringaseriesoffilteringproductsfromcoarse,medium,tohighefficiency.Itisanemergingfilteringmaterialandalsothemaindevelopmentdirectionoffilteringmaterialsinthefuture.
    Comparedwithotherfiltermaterialsofthesamelevel,ithastheadvantagesoflowresistance,lightweight,largecapacity,environmentalfriendliness(itcanbeburned),andmoderateprice.Intheindustry,itiscalledchemicalfiber,andtherearelargechemicalfiberandsmallchemicalfiber.Largechemicalfiberreferstopolyesterfiberproducedfromhigh-qualityPETchips,whilesmallchemicalfiberreferstofiberproducedfromrecycledPETchipsofrelativelypoorquality.
    2.Non-wovenFabricFilterCotton
    Thescientificnameofnon-wovenfabricfiltercottonispolyesterfiber,commonlyknownasnon-wovenfabric.Non-wovenfabrichasthecharacteristicsofwideapplication,maturetechnology,andgoodstability.ItisatypicalfiltermaterialforprimaryandmediumefficiencyplateandbagfiltersinChinaatpresent.Comparedwithotherfiltermaterialsofthesamelevel,ithastheadvantagesofstablequality,largedustholdingcapacity,strongmoistureresistance,longservicelife,andbeingeconomicalanddurable.Inrecentyears,theemergenceofcompositenon-wovenfabrichasgreatlyimprovedthelow-costandlow-gradeimageofnon-wovenfabric,anditcanbeusedforfiltrationinplaceswithrelativelyhighrequirementsforaircleanliness.
    3.GlassFiberFilterCotton
    Glassfiberfiltercottonismainlyprocessedfromvariousglassfiberswithdifferentthicknessesandlengthsthroughspecialprocesses.Glassfiberhasthecharacteristicsofstableperformance,hightemperatureresistance,highefficiency,largecapacity,andlongservicelife.Itiswidelyusedinprimaryefficiencyfiltersofgeneralventilationsystems,high-temperaturefilters,andhigh-efficiencyfilters,aswellasinplacesandenvironmentswithhighrequirementsforairfiltration.
    4.ActivatedCarbonFilterCotton
    Activatedcarbonfiltercottonreferstosyntheticfiberthathasbeentreatedbyimpregnatingwithcarbonandaddingglue.Sincethefunctionofactivatedcarbonistoremoveodors,thefiltrationefficiencyisnotemphasized.Inuse,itgenerallyneedstobeusedinconjunctionwithindependentprimaryandmediumefficiencyfilters.
    FiltrationGradesofDust-proofMasks
    Thefiltrationandprotectiongradesofdust-proofmaskscanbedividedintothreetypesaccordingtotheChinesenationalstandard:KN100masks,KN95masks,andKN90masks(theAmericanstandardisnamedstartingwithN).KNisoneofthelevelsspecifiedintheChinesenationalstandardGB2626-2019,andNisoneofthelevelsspecifiedintheAmericanstandard42CFR84.Thetechnicalrequirementsandtestingmethodsofthesetwolevelsarebasicallythesame.
    ThefiltrationeffectsofKN95andN95masksarebasicallyequivalent,thatis,theycanblockatleast95%ofverysmall(0.075±0.02micrometerlevel)testparticles,withafiltrationefficiencyof≥95%.AndtheKN100mask,whichhasthehighestprotectionlevelintheChinesenationalstandard,hasafiltrationefficiencyof≥99.97%,whichplaysanimportantroleinfilteringfinedustforworkersandpreventingthemfromsufferingfrompneumoconiosis.