ASTM D1234-1985(2008) 含脂羊毛的手扯长度的取样和试验的标准试验方法

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【英文标准名称】:StandardTestMethodofSamplingandTestingStapleLengthofGreaseWool
【原文标准名称】:含脂羊毛的手扯长度的取样和试验的标准试验方法
【标准号】:ASTMD1234-1985(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1985
【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】:D13.13
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:length;sampling;statistics;wool;Animalfibers;Fiberlength;Length;Samplingtextiles;Staplelength(ofgreasewool);Woolandwooltop;Woolandwooltop--sampling
【摘要】:Thetestingprocedureinthistestmethodforthedeterminationofstaplelengthisconsideredsatisfactoryforacceptancetestingofcommercialshipmentsofgreasewoolsincethetestmethodhasbeenusedinthetradeforacceptancetesting.Incaseofadisputearisingfromdifferencesinreportedtestresultswhenusingthistestmethodforacceptancetestingofcommercialshipments,thepurchaserandthesuppliershouldconductcomparativeteststodetermineifthereisastatisticalbiasbetweentheirlaboratories.Competentstatisticalassistanceisrecommendedfortheinvestigationofbias.Asaminimum,thetwopartiesshouldtakeagroupoftestspecimensthatareashomogeneousaspossibleandthatarefromalotofmaterialofthetypeinquestion.Thetestspecimensshouldthenberandomlyassignedinequalnumberstoeachlaboratoryfortesting.TheaverageresultsfromthetwolaboratoriesshouldbecomparedusingStudent''st-testforunpaireddataandanacceptableprobabilitylevelchosenbythetwopartiesbeforethetestingisbegun.Ifabiasisfound,eitheritscausemustbefoundandcorrected,orthepurchaserandthesuppliermustagreetointerpretfuturetestresultsinthelightoftheknownbias.Thetestmethodisusedforthedeterminationoftheaverageunstretchedstaplelengthandthestaplelengthdistributionofalotofwoolinordertoassignlengthclasseswhendeterminingtheconformanceoflotsandshipmentstolengthspecifications.Inthistestmethod,thesizeofalotcoveredbythetestprocedureislimitedtonotmorethan200packagespertest.Anyshipmentexceedingtheabovelimitsisdividedintolotswithintheprescribedlimits.Thenatureofthesamplingprocedureissuchthatgreasewoolstaplesasoriginallydrawnfromthewoolofthelotrequireonlyaslightamountofpreparationbeforemeasurement.Thebulkandlaboratorysamplesaresynonymousinthistestmethod.Compressionofwoolinthebalemakesitdifficulttopenetratetheinteriorofthebalewiththesamplingtool.However,staplescanbedrawnfromthesurfaceofthebalewiththesamplingtoolorbyhand.PracticeD4271containsinformationonhowtowriteasectiononsamplingintestmethods.Note28212;Anextensivediscussionofgreasewoolstaplesamplingcanbefoundintheliterature.
in.mm
1/83.0
3/165.0
x00BC;6.0
3/810.0
x00BD;13.0
33/886.0
4102.0
4x00BD;114.0
45/8118.0
24610.0