Molds & Tooling
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Stress concentration in PMMA gate area
Problem Phenomenon
Stress color is obvious in the gate area of transparent products under polarized light.
Cause Analysis
The gate area has fast flow velocity and high orientation; this area cools fast and stress release is insufficient.
Solution
Enlarge the gate to reduce shear; heat the mold in the gate area; anneal to eliminate stress.
Key Takeaway
The PMMA gate area is a stress concentration point.
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