Processing Machinery
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PMMA Extruded Sheet Cooling
Fenómeno del problema
PMMA extruded sheets warp after cooling
Análisis de la causa
Uneven cooling on both sides of the sheet causes inconsistent crystallization and shrinkage, producing warpage; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solución
Optimize calender roll temperature gradient; balanced cooling on both sides; stable haul-off speed; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.; change only one variable at a time and record parameter changes to facilitate locating effective measures.
Conclusión clave
Sheet warpage is controlled by roll temperature gradient and haul-off stability; 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 future problems.
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