Molds & Tooling
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MP internal shrinkage cavity
Problem Phenomenon
MP thick-wall product center has a shrinkage cavity diameter 0.5-2mm
Cause Analysis
thick-wall region interior shrinks after cooling but the surface is already solidified, cannot be fed; holding time insufficient, gate freezes prematurely
Solution
1) extend holding time until the gate completely freezes; 2) increase gate size to delay freezing; 3) product design to reduce wall thickness difference
Key Takeaway
shrinkage cavity is caused by thick-wall shrinkage and insufficient holding; extending holding is key
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