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Research Papers

Process Factors Influence on Cavity Pressure Behavior in Microinjection Moulding

[+] Author and Article Information
C. A. Griffiths1

S. S. Dimov, S. Scholz, H. Hirshy

Manufacturing Engineering Centre,  Cardiff University, Cardiff, UK

G. Tosello

Department of Mechanical Engineering,  Technical University of Denmark, Kgs. Lyngby, Denmark

1

Corresponding author.

J. Manuf. Sci. Eng 133(3), 031007 (Jun 09, 2011) (10 pages) doi:10.1115/1.4003953 History: Received September 16, 2010; Revised March 16, 2011; Published June 09, 2011; Online June 09, 2011

Process monitoring of microinjection moulding (μIM) is of crucial importance when analysing the effect of different parameter settings on the process and then in assessing its quality. Quality factors related to cavity pressure can provide valuable information about the process dynamics and also about the filling behavior of different polymer melts. In this paper, a pressure sensor mounted inside a tool cavity was employed to analyse maximum cavity pressure, pressure increase rate during filling and pressure work. The influence of four μIM parameters, melt temperature, mould temperature, injection speed, and packing pressure on these three pressure-related process parameters was investigated. A design of experiment study was conducted by moulding a test part, a microfluidic component, in three different polymer materials, PP, ABS, and PC. The results show a similar process behavior for all three polymers, in particular a higher injection speed led to a reduction of the pressure work while a lower mould temperature reduces the pressure rate.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Microfluidics part design (a) and its mould insert (b)

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Figure 2

Tool microfeatures

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Figure 5

Normal distribution of Pmax , Pwork , and Prate results

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Figure 6

Main effects’ plot of average Pmax for PP, ABS, and PC

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Figure 7

Viscosity characteristics of the three polymers

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Figure 8

Main effects’ plot of average Pwork for PP, ABS and PC

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Figure 9

Main effects’ plot of average Prate for PP, ABS, and PC

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