Injection Molding
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PETG injection molded product optical birefringence
Problembeschreibung
Transparent products show colored stripes under polarized light (stress birefringence).
Ursachenanalyse
Uneven internal stress distribution causes refractive index anisotropy, produced by uneven filling flow and cooling.
Lösung
Increase the mold temperature to reduce the cooling rate; anneal to eliminate stress; optimize gate position to improve flow.
Wichtigste Erkenntnis
PETG birefringence is the optical manifestation of uneven stress.
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