Molds & Tooling
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EAA internal shrinkage voids
Problem Phenomenon
Shrinkage voids of 0.5-2mm diameter in the center of thick-wall EAA products
Cause Analysis
After cooling of thick-wall areas the interior shrinks but the surface has solidified, unable to feed material; holding time insufficient, gate freezes too early
Solution
1) Extend holding time until the gate is completely frozen; 2) Increase gate size to delay freezing; 3) Product design to reduce wall thickness difference
Key Takeaway
Shrinkage voids are caused by thick-wall shrinkage and insufficient holding; extending holding is the key
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