| dc.description.abstract | In accordance with the strength of the product, in the present a lot of plastic materials are applied for the features of light weight, anti-corrosion, non-rust and low cost instead of using metal materials. Among plenty of plastic processing, the injection molding has great result in forming the complicated shapes with high speed and easy control of dimensional accuracy. The processing has advantages in production, however, the limits of mold design, product style, machine adjustment and processing conditions always lead to product external and internal defects. As a result, the product design is aimed to avoid the to decrease the effect on the appearance and the strength of products.
This study used polycarbonate (PC) and added carbon fiber as experimental materials to investigate the effect of injection molding parameters on the tensile strength of weld line through Taguchi experimental methods and response surface methodology. Seven control factors, namely, melt temperature, mold temperature, injection speed, injection pressure, holding speed, and holding pressure, were combined with PC only, PC with 5% added carbon fiber, and PC with 10% added carbon fiber, to derive a total of 27 injection molding parameter combinations for experimental analysis. Accordingly, a tensile strength prediction equation composed of molding parameters was established, and the parameter combination that yields the optimal tensile strength was obtained through optimization. The relationship between molding parameters and tensile strength was thus discerned. It is expected that the experimental results of this research can provide some references for the improvement of processing quality in related fields.
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