Thermoforming
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HIPS '2079851475616104458 Cold Mark
Fenómeno del problema
Cold marks appear on the product surface.
Análisis de la causa
Insufficient sheet temperature or low mold temperature causes local premature cooling.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solución
①Increase sheet temperature; ②control mold temperature; ③optimize forming timing; ④check the heating system.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Cold mark is a temperature management problem; sheet and mold temperature are controlled in coordination.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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