Material Analysis
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PMMA Melt Temperature 200-250℃
Fenómeno do problema
When melt temperature is too low, flow is poor and filling is incomplete; when too high, degradation and discoloration occur and transparency decreases
Análise das causas
The PMMA melt temperature window is 200-250℃; as temperature rises, molecular orientation and internal stress decrease but sink mark risk increases; after degradation, transparency and mechanical properties deteriorate simultaneously
Solução
①Set melt temperature 200-250℃, adjusted by grade; ②optical parts take the middle-upper limit to reduce stress; ③if discoloration appears, immediately lower temperature and investigate stagnation; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusão principal
Within the PMMA temperature window, internal stress and sink marks trade off against each other; optical parts favor higher temperature to reduce stress, thick-wall parts need balance to prevent sink marks; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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