A clear explanation of evaluation methods that visualise the ‘hardness’ and ‘toughness’ of resins In the field of plastics, differences in properties—such as ‘this resin softens easily at high temperatures’, ‘this material is impact-resistant’, or ‘it is hard at room temperature but becomes prone to deformation as soon as the temperature rises slightly’—have a significant impact on mouldability and product quality. One of the evaluation methods used to accurately understand these differences...

1. Introduction Injection molding is a manufacturing process in which molten resin is injected into a mould and then cooled and solidified to form a product. Within this sequence of processes, the ejector mechanism plays the role of ‘reliably removing the product from the mold’. In mold design, just as with filling and cooling, the quality of the ejection process has a direct impact on product quality and productivity. Although it is often overlooked, it is one of the most critical factors....

In injection molding and thermoforming, “mold temperature management” is a critically important factor determining product quality. Uneven temperature distribution can cause warping, sink marks, weld line defects, and other issues, making stable mass production difficult. However, in actual molding operations, it is difficult to directly monitor temperature changes within the mold. Consequently, temperature prediction technology using thermal-fluid analysis via CAE (Computer Aided...