Designation:D4604–95StandardTestMethodsforMeasurementofCottonFibersbyHighVolumeInstruments(HVI)(MotionControlFiberInformationSystem)1ThisstandardisissuedunderthefixeddesignationD4604;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverproceduresfortheoperationofseveralinstrumentsmeasuringvariouspropertiesofcottonfibers;specificallymicronaire,color,trashcontent,length,lengthuniformity,strength,andfiberelongation.Theseinstru-mentsareconnectedthroughacomputercommunicationsnetworkandcollectivelyareknownastheMotionControlHVIFiberInformationSystem(SeeFig.1).2Thesemethodsareapplicabletoloosecottonfiberstakenfromraworpartiallyprocessedcottonorsometypesofcottonwastes.1.1.1Themicronairereadingofloosecottonfibersisdeterminedbymeasuringtheresistanceofa“plug”ofcottonfiberstoairflowunderprescribedconditions.1.1.2Themeasurementoflengthandlengthuniformityismadebyanairflowmeasuringinstrumentoutputtingavoltagedirectlyproportionaltotheamountoffiberinthepreparedspecimenatagivendistancefromthebaseofthepreparedtestbeard,whichisheldinaclamp.1.1.3Themeasurementsoftensilestrengthorbreakingtenacityandelongationaremadebyaninstrumentinwhichthefibersareclampedbetweenjawswith1⁄8-in.(3.2-mm)spacing.Astrain-gagedeviceisusedtomeasurebreakingforce,andadisplacementmeasuringdeviceisusedtodeterminethefiberelongationatbreakingload.1.1.4ThemeasurementofthecolorofrawcottonisdonebymeansofacottoncolormeteroftheNickerson-Huntertype.Itcanbeusedtomeasurecolorofanytypeofrawcotton.1.1.5Themeasurementofthesurfacetrashcontentofrawcottonisaccomplishedthroughopticalanalysisofthesamplebyacomputergoverningthescanningactionofthesamplethroughavideocamera.1.2Thesetestmethodsmayexhibitshiftsinthelevelsoftheinstrumentoutputsdependingonthestageofprocessingatwhichthecottonfiberexistsfort...
