Molds & Tooling
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Sink marks and depressions on products
Problem Phenomenon
Surface depressions and collapse appear at wall thickness changes or on the back of reinforcing ribs
Cause Analysis
Holding pressure or holding time is insufficient; premature gate solidification interrupts the shrinkage compensation channel; product wall thickness difference is too large, causing excessive local shrinkage
Solution
Increase holding pressure and extend holding time by 30%; enlarge gate size to delay gate sealing; optimize product design for uniform wall thickness transition
Key Takeaway
The essence of sink marks is insufficient shrinkage compensation; in severe cases, it affects product mechanical strength
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