期刊
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
卷 28, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6439/aab7bf
关键词
filling mechanism; high aspect ratio; creep deformation
类别
资金
- China Scholarship Council
- Science Foundation Ireland (SFI) [15/RP/B3208, 14/IFB/2719]
- National Science Foundation of China [61675149]
- Science Foundation Ireland (SFI) [14/IFB/2719] Funding Source: Science Foundation Ireland (SFI)
Micro injection moulding has been demonstrated as one of the most efficient mass production technologies for manufacturing polymeric microfluidic devices, which have been widely used in life sciences, environmental and analytical fields and agro-food industries. However, the filling of micro features for typical microfluidic devices is complicated and not yet fully understood, which consequently restricts the chip development. In the present work, a microfluidic flow cytometer chip with essential high aspect ratio micro features was used as a typical model to study their filling process. Short-shot experiments and single factor experiments were performed to examine the filling progress of such features during the injection and packing stages of the micro injection moulding process. The influence of process parameters such as shot size, packing pressure, packing time and mould temperature were systematically monitored, characterised and correlated with 3D measurements and real response of the machine such as screw velocity and screw position. A combined melt flow and creep deformation model was proposed to explain the complex influence of process on replication. An approach of over-shot micro injection moulding was proposed and was shown to be effective at improving the replication quality of high aspect ratio micro features.
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