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논문 기본 정보

자료유형
학술대회자료
저자정보
저널정보
Korean Society for Precision Engineering 한국정밀공학회 학술발표대회 논문집 한국정밀공학회 2005년도 추계학술대회 논문요약집
발행연도
2005.10
수록면
122 - 125 (4page)

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초록· 키워드

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Experimental and numerical studies were carried out in order to investigate the processability and the transcriptability of the injection molding of micro structures. For this purpose, we designed a mold insert having micro rib patterns on a relatively thick base part. Mold insert has a base of 2㎜ thickness, and has nine micro ribs on that base plate. Width and height of the rib are 300 ㎛ and 1200 ㎛, respectively. We found a phenomenon similar to “race tracking”, due to “hesitation” in the micro ribs. As the melt flows, it starts to cool down and melt front located in the ribs near the gate cannot penetrate further because the flow resistance is large in that almost frozen portion. When the base is totally filled, the melt front away from the gate is not frozen yet. Therefore, it flows back to the gate direction through the ribs. Consequently, transcriptability of the rib far from the gate is better. We also verified this phenomenon via numerical simulation. We further investigated the effects of processing conditions, such as flow rate, packing time, packing pressure, wall temperature and melt temperature, on the transcriptability. The most dominant factor that affects the flow pattern and the transcriptability of the micro rib is flow rate. High flow rate and high melt temperature enhance the transcriptability of micro rib structure. High packing time and high packing pressure result in insignificant dimensional variations of the rib. Numerical simulation also confirms that low flow rate causes a short shot of micro ribs and high wall temperature helps the filling of the micro ribs.

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