Molds & Tooling
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Dimensional drift from PP post-shrinkage
Problembeschreibung
The product passes the outgoing inspection, but the dimensions become smaller and out of tolerance after storage at the customer.
Ursachenanalyse
PP crystallization continues after demolding, producing post-shrinkage; high-temperature environments accelerate the post-crystallization process, and premature outgoing inspection leads to missed judgment.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Lösung
①Age the product for more than 24 hours before final inspection; ②reserve a post-shrinkage margin in the mold scaling; ③evaluate dimensional stability at the use temperature; ④perform heat aging verification on key parts.
Wichtigste Erkenntnis
PP post-shrinkage is an inherent behavior of crystalline materials; dimensional judgment must allow sufficient aging time, and high-temperature applications also need to evaluate hot-state dimensions.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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