INJECTION molding is one of the most common techniques employed in the manufacture of plastic products. Injection molding of plastics began as an idea by the Hyatt brothers for the manufacture of billiard balls in the late 1800s and has evolved to a much complex operation in recent years. This evolution is being driven by a variety of forces. The need for complex parts with tighter tolerances, the types of materials, the implementation statisticarquality concepts have all been some of the driving factors for this advance. Although the basic process of injection molding has remained the same, over the last couple of decades the application of certain scientific principles has led to a better understanding of the process. This understanding has helped to make the processes robust, predictable and efficient.
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