Molds & Tooling
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ASA uneven haze
Fenómeno do problema
ASA product surface haze distribution is uneven, locally foggy and locally bright, differences obvious between different areas in the same cavity, appearance judgment controversial.
Análise das causas
Surface haze is related to the slip state of the melt on the mold wall and shear history; uneven mold temperature, local shear difference and poor venting all cause surface microstructure differences, appearing as uneven haze.
Solução
①Balance mold temperature distribution to eliminate local temperature difference; ②stabilize injection speed curve to reduce shear fluctuation; ③improve venting; ④unify cavity surface treatment grade.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
The governance of ASA uneven haze returns to temperature and shear uniformity; appearance judgment standard should quantify haze value; cavity surface consistency is the basic guarantee.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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