Analysis of the causes and solutions of irregular depressions in injection molding parts!

Author: MULAN - Plastic Molding Manufacturer

Irregular and non-smooth sinkholes on the surface of injection molded parts are easily misled as sink marks. The reason is that when the melt flows in the cavity, the structure of the part is sudden, or the plastic is easy to crystallize and solidify. For other reasons, the front pressure loss is too large, causing the front melt to gradually become thinner when it flows, and solidification stops, and then the melt flows from other directions to re-cover the previously solidified front. When the front cannot be completely covered, This creates irregular sinkholes. According to the experience of injection mold processing manufacturers, common solutions to irregular sinkholes in plastic parts are: 1. Reduce the injection speed. 2. Increase the injection pressure, especially the injection end or holding pressure.

3. Avoid excessive changes in the thickness of the workpiece, or sudden changes in the structure. 4. It is also necessary to improve the fluidity of the material. The above are the reasons and solutions for irregular sinkholes in plastic parts processed by mold injection molding.

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