【英文标准名称】:StandardPracticeforSamplingManufacturedStapleFibers,Sliver,orTowforTesting
【原文标准名称】:纺纱用人造短纤维、长纤维或亚麻短纤维试验取样标准实施规范
【标准号】:ASTMD3333-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:(Practice)
【标准水平】:()
【中文主题词】:化学纤维;工艺;抽样方法;纺织纤维;纺织材料
【英文主题词】:sampling;textilefiber;textilestrand
【摘要】:Assigningavaluetoanypropertyofthematerialinacontainerorinalot,consignment,ordeliveryinvolvesameasurementprocessthatincludesbothsamplingandtestingprocedures.Thecorrectnessofthevalueassigneddependsuponthevariabilityduetotesting.Evenwhenthevariabilityduetotestingisminimizedbycarefullydevelopedprocedures,correctandconsistentestimatesofthetruevalueofthepropertyarepossibleonlywhenthesamplingprocedureavoidssystematicbias,minimizesvariationsduetosampling,andprovidesalaboratorysampleofadequatesize.Thispracticemaynotgivethemostefficientsamplingplanthatmightbedevisedinspecialsituationsbutitdoespresentageneralprocedurethatgivessatisfactoryprecisionwithaneconomicalamountofsamplingandonewhichdoesnotrequireelaboratestatisticalcomputationbasedonpreviousknowledgeoftheamountofvariationbetweenlotsamples,betweenlaboratorysamples,andbetweentestspecimens.Thesmallestnumberofspecimensrequiredforagivenvariabilityintheaverageresultwillusuallybeobtainedby(1)minimizingthenumberofshippingunitsinthelotsample,(2)takingoneoftheshippingunitsinthelaboratorysample,and(3)takingtheprescribedspecimen(s)fromtheselectedlaboratorysampleshippingunit.(See7.3and7.4.)Tominimizethecostofsamplingalotofmaterial,itisnecessarytoagreeontherequiredvarianceforthereportedaverageforalotofmaterial:5.4.1Estimatethevarianceduetolotsamples,thevarianceduetolaboratorysamples,andthevarianceduetotestspecimens.5.4.2Calculatethetotalvariancefortheaveragetestresultsforseveralcombinationsofthenumberoflotsamples,thenumberoflaboratorysamplesperlotsample,andthenumberoftestspecimensperlaboratorysample.5.4.3Calculatethecostofperformingeachofthesamplingschemesconsideredin5.4.2.5.4.4Selectthesamplingschemethat(1)hastherequiredprecision,and(2)ismosteconomicaltoperform.1.1Thispracticecoversaprocedureforthedivisionofshipmentsofmanufacturedstaplefiber,sliver(ortop)ortowintolotsandthesamplingofsuchlotsfortesting.Note1Forsamplingyarns,refertoPracticeD2258.Note2ThispracticediffersfromBISFArulesforstaplefibersinthelotsampling,bytheeliminationofseparatesamplingofouterversusinnercontainerareas,inthereductionofnumberofstratafrom6to5,andbytheeliminationofcompositingtoobtainasinglelaboratorysampleforthelotwhentestingpropertieswhichdonotdependonas-receivedmoisturecontent.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:W04
【国际标准分类号】:59_060_20
【页数】:3P.;A4
【正文语种】: