ASTM D1425/D1425M-2009 用电容测试设备测定纱线条干不匀度的标准试验方法

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【英文标准名称】:StandardTestMethodforUnevennessofTextileStrandsUsingCapacitanceTestingEquipment
【原文标准名称】:用电容测试设备测定纱线条干不匀度的标准试验方法
【标准号】:ASTMD1425/D1425M-2009
【标准状态】:现行
【国别】:
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D13.58
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:strand;textile;unevenness;yarn;Capacitance;Filamentyarn;Knittedtextilefabrics;Roving;Sliver;Staplefibers;Textilestrands;Tow;Unevenness;Woolandwooltop;Yarnproperties
【摘要】:Thistestmethodforthedeterminationofevennessoftextilestrandsisusedextensivelyforacceptancetestingofcommercialshipmentsoffilamentorspunstapleyarn,comberlaps,roving,sliver,ortops.6.26.36.46.5Evennessvaluesobtainedondifferentinstrumentswillbecomparableforstrandsfromthesamesampleprovidedthefollowingparametersarethesameinallcases:(1)themeasureofevennessused;(2)thecapacitivelengthzoneL(see3.1.5and3.1.5.1);(3)thesamplelength,Ls(see3.1.8);(4)instrumenttestspeed,(5)laboratorytemperatureandhumidityconditions(see12.1and12.1.1);and(6)testspecimenvariation.Whendifferentmodelsofaninstrumentareused,andoneormoreofthesixparametersarenotidentical,testresultsmaydiffer.Valuesofstrandevennessarealsousedinqualitycontrol,processoptimization,andtogetherwithyarnstrengthmeasurements,isthefirstappraisalofastrand''squality.Alowevennessvalueis,ingeneral,preferred.Higherevennessvaluesgenerallyindicatedifficultspinning,loweryarnstrength,andpoorerfabricappearance.Experiencehasshownthattherelationshipofevennesstothepredictionofyarnperformanceandtofabricappearanceisnotasimpleone.Anevennessvaluemust,therefore,beusedcautiouslyandbesupplementedbyadditionalevennessinformation,suchasmid-termandlong-termmassvariations,thin,thick,andnepimperfectioncounts,diagramchartspectrogramchart,lengthvariationcurve,andhistogramanalyses.Continuousfilamentyarnsshouldbetestedformassvariationoninstrumentsspecificallydesignedtothem.;failuretodosowillresultininaccuratetestresults.Further,low-twist,continuousyarnstendtoflattentoaribbonconfigurationwhilepassingthroughthecondenserofacapacitanceinstrument.Thesespecificinstrumentsaredesignedtoinsertfalsetwistinthecondenserduringtestingtoovercometheflatteningeffectandmayresultinfalsevariationreadings.6.4Strandsmadefromfiberblendsshouldbetestedonlyifthedifferentfibersareuniformlydistributedthroughoutthestrand.Non-uniformblendingmaycauseahigherreadingofmassvariationthanthetruevalueifthecomponentfibersdifferindielectricconstant(see3.1.1and3.1.1.1).6.5Evennessvaluesobtainedondifferentinstrumentswillbecomparableforstrandsfromthesamesampleprovidedthefollowingparametersarethesameinallcases:(1)themeasureofevennessused;(2)thecapacitivelengthzoneL(see3.1.5and3.1.5.1);(3)thesamplelength,Ls(see3.1.8);(4)instrumenttestspeed,(5)laboratorytemperatureandhumidityconditions(see12.1and12.1.1);and(6)testspecimenvariation.Whendifferentmodelsofaninstrumentareused,andoneormoreofthesixparametersarenotidentical,testresultsmaydiffer.6.6Ifthereareanydifferencesofpracticalsignificancebetweenreportedtestresultsfortwo(ormore)laboratories,comparativetestshouldbeperformedusingcompetentstatisticalassistanceandanagreeduponnumberofsamplesthatarehomogeneousandrandomlyassigned,shouldbeusedtodetermineifthereisastatisticallysignificantdifferencebetweenthem.Ifabiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestingforthatmaterialmustbeadjustedinconsiderationofthestatisticallysignificantdifferencesfound.1.1Thistestmethodcoverstheindirectmeasurementofevenness(massvariation)ofnon-conductivetextilestrands,includingtop,comberlap,sliver,roving,andyarnproducedfromstaplefibersandcontinuousfilamentyarns,bymeansofcapacitancetestingequipment.1.2Strandsmadefromfiberblendscanbetestedusingthistestmethodonlyifthedifferentfibersareuniformlydistributedthroughoutthestrand.1.3Thetestmeth......
【中国标准分类号】:W58
【国际标准分类号】:59_080_50
【页数】:5P.;A4
【正文语种】: