| Download | - View accepted manuscript: Real-time ultrasonic diagnosis of polymer degradation and filling incompleteness for micromoulding (PDF, 652 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1179/174328905X71977 |
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| Author | Search for: Whiteside, B. R.; Search for: Brown, E. C.; Search for: Ono, Y.1; Search for: Jen, C.-K.1; Search for: Coates, P. D. |
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| Affiliation | - National Research Council of Canada. NRC Industrial Materials Institute
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| Format | Text, Article |
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| Subject | integrated ultrasonic sensors; process diagnosis; micromoulding; polymer degradation; filling incompleteness; melt flow speed |
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| Abstract | Injection moulding techniques have been miniaturised and refined to achieve micromoulding which aims to satisfy the need for mass production of low-cost micro- and nanoscale components. However, the microscale mould cavity features and extreme processing conditions which are inherent in the process can result in larger process variations than conventional injection moulding, with a corresponding increase in the probability of producing an unsatisfactory product. Accurate process diagnosis is required to ensure process reliability but integration of sensors onto the small and highly detailed mould units can be problematic and alternatives may need to be sought. Piezoelectric film ultrasonic transducers were integrated onto the extrusion barrel and mould insert of a micromoulding machine for real-time, non-destructive and non-intrusive process diagnosis with an ultrasonic pulse-echo technique. Polymer degradation owing to excessive heating at the extrusion barrel was successfully probed by measuring the ultrasonic velocities in the polymer at the mould insert. Filling incompleteness of the mould cavity was also sensitively detected by monitoring the ultrasonic energy variation transmitted into the part at different points along the melt flow length. The developed ultrasonic sensors and technique enable optimisation and in-process quality assurance of the moulded parts which ensures that maximum process efficiency can be achieved. |
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| Publication date | 2005-11-01 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRCC 47921 |
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| NPARC number | 15966882 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 2c918cbb-6ea9-4476-ba5d-4c5c0d9ad565 |
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| Record created | 2010-10-05 |
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| Record modified | 2020-04-07 |
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