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causes and solutions for sink Marks

Sinking is caused by the outer skin of plastic solidifying while the material inside is still molten and viscous. As it cools and solidifies, the material compacts . The best way to avoid these dimples is to design the part with a consistent wall thickness. However, many times the effect of the sink mark can be minimized by adjusting molding parameters such as injection pressure and time. While sinking happens, we should make sure there is a cushion maintained. A few factors such as shot size, pack and hold pressure should be increased.
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