Any molder can prove that all the conditions and effects discussed in this chapter do indeed occur during the injection molding process. While this knowledge alone can somewhat improve quality, it is only with the use of Moldflow analysis during the initial design stage, with the mold designed for the optimum filling pattern, that these effects can be controlled and the full benefits obtained. Flow technology is concerned with the behavior of plastics during the mold filling process. A plastic part's properties depend on how the part is molded. Two parts having identical dimensions and made from the same material but molded under different conditions will have different stress and shrinkage levels and will behave differently in the field, meaning that they are in practice two different parts. The way the plastic flows into the mold is of paramount importance in determining the quality of the part. The process of filling the mold can be distinctly analyzed with the ability to predict pressure, temperature, and stress.
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