The flow of polymers in micromolding applications is dominated by shear stresses. At high flow velocities and small wall thicknesses, the shear rates can exceed the typical characterization scheme of 10,000 reciprocal seconds. Yet, the effective design of micromolded parts and micromolding processes requires a correct understanding of the flow dynamics. In this paper, analytical models assuming power law fluid behavior are developed and experimentally validated for wall thicknesses of 10, 20, and 100 micro meters. A design of experiments is conducted to consider the effect of wall thickness, channel width, melt temperature, and pressure on flow rate in an isothermal molding process. The results indicate that the power law model is a valid representation for viscous polymer flow in very thin gaps under isothermal conditions, though further work is required to validate the non-isothermal dynamics.
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ASME 2007 International Manufacturing Science and Engineering Conference
October 15–18, 2007
Atlanta, Georgia, USA
Conference Sponsors:
- Manufacturing Division
ISBN:
0-7918-4290-8
PROCEEDINGS PAPER
Characterization of Polymer Flows in Very Thin Gaps
Rahul R. Panchal,
Rahul R. Panchal
University of Massachusetts - Lowell, Lowell, MA
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David Kazmer
David Kazmer
University of Massachusetts - Lowell, Lowell, MA
Search for other works by this author on:
Rahul R. Panchal
University of Massachusetts - Lowell, Lowell, MA
David Kazmer
University of Massachusetts - Lowell, Lowell, MA
Paper No:
MSEC2007-31108, pp. 179-189; 11 pages
Published Online:
March 24, 2009
Citation
Panchal, RR, & Kazmer, D. "Characterization of Polymer Flows in Very Thin Gaps." Proceedings of the ASME 2007 International Manufacturing Science and Engineering Conference. ASME 2007 International Manufacturing Science and Engineering Conference. Atlanta, Georgia, USA. October 15–18, 2007. pp. 179-189. ASME. https://doi.org/10.1115/MSEC2007-31108
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