Molds & Tooling
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PMMA Optical Part Slow Cooling
Fenómeno del problema
PMMA thick lenses show internal stress patterns after ejection from the mold
Análisis de la causa
Uneven cooling inside and outside of thick-walled optical parts produces stress birefringence; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solución
Take the upper limit of mold temperature and extend cooling; slow cooling in an insulated box after ejection; anneal when necessary; after adjustment, take samples continuously 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
Slow cooling of thick optical parts is a necessary process to relieve stress; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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