Injection Molding
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PETG injection molded product optical birefringence
Fenómeno do problema
Transparent products show colored stripes under polarized light (stress birefringence).
Análise das causas
Uneven internal stress distribution causes refractive index anisotropy, produced by uneven filling flow and cooling.
Solução
Increase the mold temperature to reduce the cooling rate; anneal to eliminate stress; optimize gate position to improve flow.
Conclusão principal
PETG birefringence is the optical manifestation of uneven stress.
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