Processing Machinery
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PMMA Thick-Wall Part Vacuum Voids
Fenómeno del problema
Vacuum voids appear in the center of thick-wall transparent parts, holes are visible on sectioning, and optical parts are directly scrapped.
Análisis de la causa
The surface layer of thick areas solidifies first, and internal shrinkage forms vacuum voids; although PMMA shrinkage is not large, they still form after the feeding channel of ultra-thick sections freezes.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solución
①Core-out and thinning design for thick areas; ②extend holding pressure time; ③raise mold temperature to delay freezing; ④evaluate layered injection for thick-wall optical parts.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
Vacuum voids are a fatal defect of thick-wall transparent parts; structural thinning is fundamental, and thick optical parts also need dedicated process evaluation.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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