Observation of instabilities in flow front during micro injection molding process

Autor:	Yeong-Eun Yoo, Sun Kyoung Kim, Kwan-Hee Lee, Dae-Jin Kim, Sung-Ju Choi
Rok vydání:	2010
Předmět:	Microchannel Materials science Polymers and Plastics Mechanical engineering General Chemistry Molding (process) Mechanics Channel width medicine.disease_cause Instability Mold Materials Chemistry medicine Merge (version control) Micro injection
Zdroj:	Polymer Engineering & Science. 50:1377-1381
ISSN:	0032-3888
DOI:	10.1002/pen.21679
Popis:	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 :137 7 -1381, 2010. © 2010 Society of Plastics Engineers.
Databáze:	OpenAIRE
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