Molds & Tooling
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POM First Article and Patrol Inspection
Problem Phenomenon
After material or mold change, discoloration and weight fluctuation appear in batches; first article only checks appearance
Cause Analysis
POM is sensitive to heat history and cleanliness; after material change, mass production starts without verifying barrel state changes; weight fluctuation reflects plasticization and check valve status, which appearance cannot reveal
Solution
①First article performs three verifications of appearance, weight, and dimension; ②focus patrol inspection on the first few dozen shots after material change; ③include weight data in SPC monitoring; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM first article verification must include weight; qualified appearance does not mean normal plasticization—data-based patrol inspection prevents batch accidents; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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