Processing Machinery
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PPO Product Stress Detection
Fenómeno do problema
[Problem Phenomenon] Lack of on-site determination means for PPO internal stress; problems are only found after flowing out
Análise das causas
Internal stress cannot be judged visually and requires detection means such as solvent immersion or polarized light; immersion in ESC-sensitive media can quickly expose the stress level; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
Establish a solvent immersion stress detection procedure; sample-check key parts for polarized stress; associate and trace detection results with process parameters; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
PPO internal stress relies on solvent immersion detection; visual inspection will miss it; 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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