Molds & Tooling
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Stress concentration in PMMA gate area
Fenómeno del problema
Stress color is obvious in the gate area of transparent products under polarized light.
Análisis de la causa
The gate area has fast flow velocity and high orientation; this area cools fast and stress release is insufficient.
Solución
Enlarge the gate to reduce shear; heat the mold in the gate area; anneal to eliminate stress.
Conclusión clave
The PMMA gate area is a stress concentration point.
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