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【英文标准名称】:StandardPracticeforRubberfromNaturalSources-SamplingandSortingBalesBasedonPredictedProcessingProperties
【原文标准名称】:天然橡胶的标准实施规程-基于预测加工性能的取样和分类
【标准号】:ASTMD7050-2004(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【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】:D11.22
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:hardrubber;naturalrubber;processability;processingproperties;sampling;softrubber;sortingbalesRubber(natural)
【摘要】:InaccordancewithSpecificationD2227,shipmentsofTSR10andTSR20mustmeetaminimuminitialWallaceplasticity(Po)of30tobeaccepted.However,evenwiththisminimumrestriction,theuncuredviscoelasticorx201C;processabilityx201D;propertiesareallowedtovarygreatly.Thisvariationinpropertiescansignificantlyaffectthequalityandefficiencyofafactoryoperation.BalesofTSR10orTSR20whicharelowerintheiruncuredelasticquality(x201C;softx201D;rubber)insomecasesmayimpartbetterprocessingpropertiestotireinnerliners,cushiongums,andsidewalls.x201C;Softx201D;balessometimesimpartbetterbuildingtack,bettermoldflow,andlowerextrusiondieswellwithbetterdimensionalstability.Also,thesex201C;softx201D;rubberbalesmaydissolvefasterinsolventsforadhesiondipping.BalesofTSR10orTSR20thatarehigherintheiruncuredelasticquality(x201C;hardx201D;rubber)insomecasesgenerategreatershearingduringtheinitialstagesofafactorymix,whichresultinafasterbreakdownandashortermixcycle.Therefore,inafactoryoperation,sometimessegregatingTSR10orTSR20shipmentsintox201C;softx201D;andx201C;hardx201D;categoriescanimprovetheefficiencyandqualityofafactoryoperation.1.1ThispracticecoversthesortingofnaturalrubberbalesofTSR10orTSR20inthefactoryaccordingtotheirpredictedprocessingperformancebasedondifferencesinviscoelasticproperties.1.2Thispracticedetermineswhichbalesshouldbeusedinfactorycompoundswhichbenefitfromusingx201C;softx201D;naturalrubberversuswhichworkbetterwithx201C;hardx201D;naturalrubber.
【中国标准分类号】:B72
【国际标准分类号】:83_060
【页数】:2P.;A4
【正文语种】:英语