Thermoforming
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PVC '2079851475616104458 Chill Marks
Fenómeno do problema
Cold lines and haze marks on product surface, corresponding to plug/mold surface contact areas.
Análise das causas
Hot sheet contacts cold plug/mold surface prematurely and is quenched; mold temperature too low; set before stretching is completed, leaving stress marks; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solução
①Heat the plug; ②Appropriately increase mold temperature to improve melt replication and fit to cavity surface; ③Slow down plug speed; ④Balance heating zones; ⑤Check direct airflow blowing.
Conclusão principal
PVC chill mark = 'touching cold surface prematurely': raising mold temperature and slowing contact can eliminate it; a typical temperature management problem, unrelated to the material itself; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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