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>The evaluation of vacuum venting and variotherm proceb 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 proceb for improving the replication by injection molding of high aspect ratio micro features for biomedical application
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机译:评估用于生物医学应用的高纵横比微观特征的注射成型以改善复制的真空排气和恒温工艺
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摘要
The aspect ratio achievable in replicating micro features is one of the most important proceb 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 proceb, 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 glab 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.
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