Molding Process
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PMMA Silver Streak and Crack Distinction
Problem Phenomenon
Fine patterns appear on the product surface; unable to distinguish whether they are silver streaks or cracks, handling is hesitant
Cause Analysis
Silver streaks are surface-level defects and warning signals of existing stress; a small amount of additional stress can develop into catastrophic cracking; cracks are actual failures where stress has exceeded material strength
Solution
①When silver streaks appear, immediately investigate stress sources and anneal; ②scrap cracked parts and trace the cause of stress; ③focus on prevention and control in solvent contact environments; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Silver streaks are PMMA's last warning; investigate stress as soon as streaks are seen, do not wait for cracking to trace back; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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