ASTM D7050-2004 天然橡胶的标准规程.基于预测加工性能的取样和分类

作者:标准资料网 时间:2024-05-17 09:17:10  浏览:9498   来源:标准资料网

【英文标准名称】:StandardPracticeforRubberfromNaturalSources-SamplingandSortingBalesBasedonPredictedProcessingProperties
【原文标准名称】:天然橡胶的标准规程.基于预测加工性能的取样和分类
【标准号】:ASTMD7050-2004
【标准状态】:现行
【国别】:
【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;sortingbales
【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.1.2Thispracticedetermineswhichbalesshouldbeusedinfactorycompoundswhichbenefitfromusing"soft"naturalrubberversuswhichworkbetterwith"hard"naturalrubber.
【中国标准分类号】:G34
【国际标准分类号】:83_060
【页数】:2P.;A4
【正文语种】: