Problems and Improvement Methods in the Molding Site: Methods for Improving Voids

There are two types of causes for occurrence! We will introduce improvement measures for each cause.

A void refers to bubbles that occur inside a product. Since they are internal, the presence of voids is not noticeable in the appearance of anything other than transparent resin. As a result, they are a type of defect that can easily be overlooked, but they become an unstable factor in terms of strength. In particular, the reduction in strength due to voids is particularly evident under compressive forces. The causes of voids occurring when "air is already present in the injected material" include air that mixes in while the resin is being plasticized, as well as gases and water vapor generated during the plasticization process. These can be improved by adjusting the molding conditions. [Causes and Countermeasures (Partial)] <Problem> ■ When air is already present in the injected material <Countermeasures> ■ Air that mixes in while the resin is being plasticized and gases generated during plasticization 　→ Improved by adjusting molding conditions such as water vapor ■ Air trapped when injecting into spools, runners, and cavities 　→ Adjusting molding conditions has limited effectiveness; modifying the mold is effective *For more details, please refer to the PDF document or feel free to contact us.

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