| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 87 === With the increase demand for plastic, the production is more concentrated on improvement of quality and accuracy of plastic products. And, it also becomes a trend to make products of lighter and smaller. Among many of the manufacturing processes, injection molding is one of the most widespread method for fabricating plastic parts.In this article, we have a closer look on how temperature and thickness affect the mold filling on thin part injection molding. By using different mold temperatures and the thicknesses of a mold cavity, we can observe the effect of molding and also measure the change of temperature. The thinner the specimen, the more serious the problem of short shot. But after raising the mold temperature and injection pressure, the improvement is not as much as in the case of molding a thin part. We find that the effect of mold filling between mold temperature 80℃ to 120 ℃ have no much difference. Thickness is the major factor in this experiment. We also use electron microscopes to observe the cross section of the molding specimen that contains short glass fiber. There are a lot of article that have had some relative research about the effect of injection molding thickness, but the discussion of thin part molding is not quite complete. This experiment investigates the effect of some factors such as mold temperature and thickness on the thin part injection molding.
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