Injection Molding
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Poor surface gloss of PBT injection molded products
Problem Phenomenon
The surface gloss of PBT products is low, especially for unreinforced grades.
Cause Analysis
PBT crystallizes quickly, and the surface layer has begun to crystallize during mold filling; the crystallized layer surface is rough and scatters light; low mold temperature aggravates surface rapid cooling crystallization.
Solution
Raise the mold temperature to 80-120°C to delay surface crystallization; increase the injection speed; use a mirror mold polished to Ra≤0.05μm.
Key Takeaway
PBT surface gloss is dominated by crystallization behavior, and a high-temperature mold is the key.
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