Molds & Tooling
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POM product deformation out of tolerance after aging
Problem Phenomenon
Products that passed outgoing inspection were returned for out-of-tolerance dimensions after storage at the customer, and re-measurement confirmed continued shrinkage.
Cause Analysis
POM post-crystallization shrinkage continues after demolding, and a high-temperature environment accelerates this process; outgoing inspection was performed too early without waiting for dimensional stabilization, leading to missed judgment.；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Age the products for more than 24 hours before final inspection; ②evaluate dimensional stability at the service temperature; ③consider the full shrinkage in mold compensation; ④perform thermal aging verification on critical parts.
Key Takeaway
POM dimensional judgment must allow sufficient aging time; for temperature-rise conditions, hot-state dimensions should also be evaluated to avoid disputes over post-shipment shrinkage out of tolerance.；After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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