【英文标准名称】:StandardTestMethodforExtensionForceofPartiallyOrientedYarn
【原文标准名称】:部分取向纱延展力的标准试验方法
【标准号】:ASTMD5344-1999(2005)
【标准状态】:现行
【国别】:
【发布日期】:1999
【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】:试验;纱;纺织材料
【英文主题词】:force,extension;yarnpartially-oriented
【摘要】:Thistestmethodisconsideredsatisfactoryforacceptancetestingofcommercialshipmentsbecausecurrentestimatesofbetween-laboratoryprecisionareacceptableandthemethodisusedextensivelyinthetradeforacceptancetesting.5.1.1Iftherearedifferencesorpracticalsignficancebetweenreportedtestresultsfortwolaboratories(ormore),comparativetestsshouldbeperformedtodetermineifthereisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,thetestsamplestobeusedareashomogeneousaspossible,aredrawnfromthematerialfromwhichthedisparatetestresultsareobtained,andareassignedrandomlyinequalnumberstoeachlaboratoryfortesting.Othermaterialswithestablishedtestvaluesmaybeusedforthispurpose.Thetestresultsfromthetwolaboratoriesshouldbecomparedusingastatisticaltestforunpaireddata,ataprobabilitylevelchosenpriortothetestingseries.Ifabiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestresultsmustbeadjustedinconsiderationoftheknownbias.Elapsedtimebetweenspinningandtestinghasamarkedeffectontheresultsofthedrawtensiontest,especiallyduringthefirst24h.Therefore,iftestedwithin24hofspinning,specimensshouldbecomparedonlyiftestedafterthesameelapsedtime.Nospecimenshouldbetestedwithin4hofspinningbecausetheagingprocessisatitsmostrapidrateduringthisperiod,andthedifferencesinrateduetofiberstructurearemostpronounced.Theextensionforceofmanufacturedfilamentyarnsisrelatedtothealignmentofthemoleculesintheyarnfilaments,whichinfluencestheyarnprocessingbehavior.Knowledgeofthispropertyofpartiallyorientedyarnisusefultodetermineprocessingconditions.1.1Thistestmethodcoversthemeasurementofextensionforcedevelopedwhiledrawingapartiallyorientedfilamentyarn.1.2Thistestmethodprovidesanestimateoftheyarnorientationbymeansofcontinuousdrawingoftheyarnwhilerunningbetweenpairsofdrawrollsofdifferentsurfacespeeds.1.3Thistestmethodappliestopartiallyorientedfilamentyarnslessthan33.3tex(300denier),butitcanbeusedforhigherdeniersbyapplyingthetestconditionsasdirectedinAppendixX1.1.4ThistestmethodwaswritteninSIunits.Theinch-poundunitsthatareprovidedinthistestmethodarenotnecessarilyexactequivalentsoftheSIunits.Eithersystemofunitsmaybeusedinthistestmethod.Incaseofreferencedecisions,theSIunitswillprevail.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H23
【国际标准分类号】:59_080_20
【页数】:6P.;A4
【正文语种】: