Molds & Tooling
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Glass Fibre internal shrinkage void
Problem Phenomenon
Glass Fibre thick-wall product center shrinkage void diameter 0.5-2mm
Cause Analysis
Thick-wall region after cooling interior shrinks but surface already solidified, cannot feed; holding time insufficient, gate freezes too early
Solution
1) Extend holding time until gate completely frozen; 2) increase gate size to delay freezing; 3) product design reduces wall thickness difference
Key Takeaway
Shrinkage void is caused by thick-wall shrinkage and insufficient holding; extending holding is key
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