Injection Molding
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PETG injection molded product optical birefringence
Fenómeno del problema
Transparent products show colored stripes under polarized light (stress birefringence).
Análisis de la causa
Uneven internal stress distribution causes refractive index anisotropy, produced by uneven filling flow and cooling.
Solución
Increase the mold temperature to reduce the cooling rate; anneal to eliminate stress; optimize gate position to improve flow.
Conclusión clave
PETG birefringence is the optical manifestation of uneven stress.
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