| Summary: | 博士 === 中原大學 === 機械工程研究所 === 96 === Abstract
Going along with the high technology development, many of the plastic products are designed toward weight-reduction, thin wall and minified size, so it is more important for mechanical strength of these products. The thinner the thickness of part, the shorter solidified time of plastic resin. Therefore, injection velocity plays a significant role in influencing part quality including mechanical strength. Based on these, ultra speed injection molding is necessary.
This study investigates the effect of processing conditions on the mechanical strength of thin-wall parts. From the experimental results of part thickness 0.6 mm, it was found that injection velocity (from 900 mm/sec increased to 1200 mm/sec) that affect mechanical strength most significantly for ABS resin at double gate. Furthermore, melt temperature and mold temperature are two parameters that affect mechanical strength most significantly for HDPE resin at single gate and double gate, respectively.
In this study, the molding window (defined as the mold temperature versus the injection velocity) of Secure Digital Card (with the dimension of 32×24×0.25 mm) was get using ABS and HDPE resin under the molding conditions of melt temperature 240˚C, the higher injection pressure/off, mold temperature (30˚C~100˚C) and various injection velocity.
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