Observation of instabilities in flow front during micro injection molding process

Sun Kyoung Kim; Sung Ju Choi; Kwan Hee Lee; Dae Jin Kim; Yeong Eun Yoo

doi:10.1002/pen.21679

Observation of instabilities in flow front during micro injection molding process

Sun Kyoung Kim, Sung Ju Choi, Kwan Hee Lee, Dae Jin Kim, Yeong Eun Yoo

Dept. of Mechanical System and Design Engineering

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

This work has investigated filling characteristics during injection molding of a thin-plate with microchannel patterns on it. To conduct molding experiments, an injection mold and mold inserts with microchannel patterns were designed and built. The experiments were conducted for three different channel sizes, and the results are analyzed. An unstable filling flow was observed in microscopic images for the smallest channel size. The front advanced with continuous creation and merge of microballs, which looked like teeth on the gum. We have analyzed this phenomenon and argued that there exists a critical channel width where such instability takes places. POLYM. ENG. SCI., 50:1377-1381, 2010.

Original language	English
Pages (from-to)	1377-1381
Number of pages	5
Journal	Polymer Engineering and Science
Volume	50
Issue number	7
DOIs	https://doi.org/10.1002/pen.21679
State	Published - Jul 2010

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10.1002/pen.21679

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abstract = "This work has investigated filling characteristics during injection molding of a thin-plate with microchannel patterns on it. To conduct molding experiments, an injection mold and mold inserts with microchannel patterns were designed and built. The experiments were conducted for three different channel sizes, and the results are analyzed. An unstable filling flow was observed in microscopic images for the smallest channel size. The front advanced with continuous creation and merge of microballs, which looked like teeth on the gum. We have analyzed this phenomenon and argued that there exists a critical channel width where such instability takes places. POLYM. ENG. SCI., 50:1377-1381, 2010.",

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AU - Choi, Sung Ju

AU - Lee, Kwan Hee

AU - Kim, Dae Jin

AU - Yoo, Yeong Eun

PY - 2010/7

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AB - This work has investigated filling characteristics during injection molding of a thin-plate with microchannel patterns on it. To conduct molding experiments, an injection mold and mold inserts with microchannel patterns were designed and built. The experiments were conducted for three different channel sizes, and the results are analyzed. An unstable filling flow was observed in microscopic images for the smallest channel size. The front advanced with continuous creation and merge of microballs, which looked like teeth on the gum. We have analyzed this phenomenon and argued that there exists a critical channel width where such instability takes places. POLYM. ENG. SCI., 50:1377-1381, 2010.

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JO - Polymer Engineering and Science

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Observation of instabilities in flow front during micro injection molding process

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