Abstract
In this study, the mold deformation during injection molding was measured using an eddy current displacement sensor, and the correlation between the mold deformation and thickness shrinkage of the product was analyzed based on the packing pressure and packing time. Injection molding was performed using a five-inch light guide plate mold. During the injection phase, the maximum mold deformation was evaluated, and during the other phases, the time integral value of mold deformation was set as the evaluation index. In each phase, the factors were evaluated and compared for the maximum injection pressure, packing pressure, and packing time. In addition, the thickness shrinkage was measured and analyzed to evaluate the correlation with the mold deformation. Based on the evaluated correlations, guidelines on controlling the shrinkage by varying the maximum injection pressure, packing pressure, and packing time with mold deformation were developed.
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