Article(id=1242117357074710543, tenantId=1146029695717560320, journalId=1146031591421210625, issueId=1242116071021416959, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1240761600000, receivedDateStr=2009-04-27, revisedDate=1245254400000, revisedDateStr=2009-06-18, acceptedDate=null, acceptedDateStr=null, onlineDate=1247414400000, onlineDateStr=2009-07-13, pubDate=1247414400000, pubDateStr=2009-07-13, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1247414400000, onlineIssueDateStr=2009-07-13, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774073455349, creator=sys-migrate, updateTime=1774073455349, updator=sys-migrate, issue=Issue{id=1242116071021416959, tenantId=1146029695717560320, journalId=1146031591421210625, year='2009', volume='27', issue='0913', pageStart='1', pageEnd='140', issueExtLink='null', onlineDate='null', pubDate='1247414400000', pubDateStr='2009-07-13', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=3, issueType=-1, specialIssue=null, createTime=1774073148726, creator='sys-migrate', updateTime=1774073148726, updator='sys-migrate', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=14, endPage=13, ext={EN=ArticleExt(id=1242117361248043055, articleId=1242117357074710543, tenantId=1146029695717560320, journalId=1146031591421210625, language=EN, title=Simulation of Extrusion of Rigid Polyvinyl Chloride in Twin-screw Dies, columnId=1242116080374710456, journalTitle=Science & Technology Review, columnName=Articles, runingTitle=null, highlight=null, articleAbstract=Flat and round dies are numerically designed in this paper. The non-isothermal flow fields of rigid polyvinyl chloride melts in the dies are obtained by using the finite element method. The effects of die structure on polymer flow fields are studied to provide a theoretical and technical support for the die design. It is shown that the pressure in the transition zone is greater for the flat die than for the round die. The parameters along the axial direction have a greater variation for the flat die than for the round die. On the exit plane, the gradients of velocity and viscous heating are smaller for the flat die than for the round die. The velocity of the melts on the exit plane is more uniformly distributed for the flat die than that for the round die. However, the gradients of pressure, shear stress, shear rate and viscosity of the melts are greater in the flat die than in the round die. Higher stress leads to bigger die swell. In the die design, the die structure should be determined by considering all factors discussed and the characteristics of the polymer., authors=null, authorsList=null, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=AubxXvA1CgYC1+7rL9mTUw==, pdfFileSize=949914, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1242117360421765157, articleId=1242117357074710543, tenantId=1146029695717560320, journalId=1146031591421210625, language=CN, title=数值模拟硬质聚氯乙烯双螺杆模具挤出过程, columnId=1146540929516700224, journalTitle=科技导报, columnName=研究论文, runingTitle=null, highlight=null, articleAbstract=数字设计了双螺杆挤出扁口和圆口模具，使用有限元方法数值计算了两种模具内硬质聚氯乙烯熔体的非等温流场，分析比较了模具结构对熔体各物理量的影响。研究结果表明，与圆口模具相比，扁口模具过渡段压力小，熔体各物理量沿轴向变化较剧烈。在出口截面上，扁口模具内熔体速度和黏性热梯度小，速度均匀性高于圆口模具。但扁口模具内熔体压力、剪切应力、剪切速率和黏度梯度大。大的剪切应力引起大的离模膨胀。设计模具时应根据物料特性，综合考虑各方面因素来决定模具结构。, authors=陈晋南,胡敏,彭炯, authorsList=陈晋南;胡敏;彭炯, authorCompany=北京理工大学化工与环境学院, correspAuthors=null, authorNote=null, correspAuthorsNote=陈晋南, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=15mjbvUHd88ie0v6zG+u7w==, pdfFileSize=949914, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null)}, authors=null, keywords=[Keyword(id=1242117358723076527, tenantId=1146029695717560320, journalId=1146031591421210625, articleId=1242117357074710543, language=CN, orderNo=1, keyword=硬质聚氯乙烯), Keyword(id=1242117360144945585, 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