Injection Molding
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Poor surface gloss of PBT injection molded products
Fenómeno do problema
The surface gloss of PBT products is low, especially for unreinforced grades.
Análise das causas
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.
Solução
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.
Conclusão principal
PBT surface gloss is dominated by crystallization behavior, and a high-temperature mold is the key.
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