Injection Molding
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Translucent/Hazy PBT Injection-Molded Parts (Non-Transparent Grade)
Fenómeno del problema
Partially translucent or hazy areas appear in natural-color non-transparent PBT products.
Análisis de la causa
The local area is not fully crystallized (rapid cooling causes incomplete crystallization), and the optical properties of this area are different from those of the fully crystallized area.
Solución
Increase the mold temperature to ensure uniform crystallization; extend the cooling time; anneal the product to homogenize crystallization.
Conclusión clave
PBT haziness is the optical manifestation of uneven crystallization.
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