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首页> 外文会议>International Conference of the Polymer Processing Society >The Evaluation of Vacuum Venting and Variotherm Process for Improving the Replication by Injection Molding of High Aspect Ratio Micro Features for Biomedical Application
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The Evaluation of Vacuum Venting and Variotherm Process for Improving the Replication by Injection Molding of High Aspect Ratio Micro Features for Biomedical Application

机译：真空通风和变沙仪评价，用于改善高纵横比微特征对生物医学应用的重复性

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摘要

The aspect ratio achievable in replicating micro features is one of the most important process characteristics and it is a major manufacturing constraint in applying injection molding in a range of micro engineering applications. Vacuum venting has been reported to be an effective technique in replicating micro features by microinjection molding. High surface-to-volume ratio and reduced dimensions of micro parts promote the instantaneous drop of melt temperature and consequently lead to incomplete filling. This study aims to investigate the effects of variotherm process, cavity evacuation and their interaction on the production of a micro fluidic filter for biomedical applications. A low-viscosity polystyrene and a cyclic olefin copolymer were molded applying a combination of mold evacuation and a rapid mold temperature variation that keeps the cavity temperature above the glass transition temperature during the injection phase. The research revealed the importance of these molding technologies in enhancing part filling and the replication quality for high aspect ratio micro features.
机译：在复制微观特征中可以实现的宽高比是最重要的工艺特性之一，并且它是在一系列微型工程应用中应用注塑的主要制造限制。据报道，真空通风是通过显微注射成型复制微观特征的有效技术。高度高比率比和微零件的尺寸减小促进熔体温度的瞬时下降，从而导致不完全填充。本研究旨在探讨变量摩擦，腔疏散及其对生物医学应用微流体过滤器的影响的影响。模塑了低粘度聚苯乙烯和环状烯烃共聚物，施加模具抽空和快速模具温度变化的组合，其在注射阶段期间将腔温度保持在玻璃化转变温度高于腔体温度。该研究揭示了这些模塑技术在增强部分填充和高纵横比微观特征的复制质量方面的重要性。

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