Molds & Tooling
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Poor surface gloss of PA66 products
Fenómeno do problema
Dull and not bright, poor appearance.
Análise das causas
Low mold temperature, fast crystallization causes poor surface replication; the front cools fast; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; during troubleshooting, confirm item by item around key factors such as gloss and mold temperature to avoid misjudgment.
Solução
①Appropriately raise mold temperature to improve melt replication and fit to the cavity surface; ②increase injection speed to maintain melt front temperature and improve filling; ③polish the cavity or die lip to reduce surface resistance and improve replication; ④strengthen drying and verify moisture content compliance by moisture determination; ⑤stabilize the melt temperature curve to avoid quality drift caused by temperature fluctuation.
Conclusão principal
PA66 gloss='mold temperature + speed': fast-crystallizing nylon needs high-temperature fast replication; mold temperature and speed are the two levers of gloss; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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