Molds & Tooling
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HDPE First Article Verification
Problem Phenomenon
After material and mold change, warpage and dimensional out-of-tolerance appear in batches, while first article only checks appearance
Cause Analysis
HDPE is sensitive to cooling and holding pressure, and shrinkage behavior changes after grade change; first article without dimensional and warpage verification loses control of batch risk; shrinkage continues even after 24 hours
Solution
①First article performs appearance, dimension, and warpage three-item verification; ②dimensional inspection is performed after 24-hour stabilization; ③compare shrinkage when changing grades; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
HDPE first article verification must account for time; only inspection after 24-hour stabilization gives data representing true dimensions; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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