Injection Molding
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Translucent/Hazy PBT Injection-Molded Parts (Non-Transparent Grade)
Problem Phenomenon
Partially translucent or hazy areas appear in natural-color non-transparent PBT products.
Cause Analysis
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.
Solution
Increase the mold temperature to ensure uniform crystallization; extend the cooling time; anneal the product to homogenize crystallization.
Key Takeaway
PBT haziness is the optical manifestation of uneven crystallization.
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