Molds & Tooling
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Product stress cracking
Problembeschreibung
Fine cracks appear on the surface of PEI products during placement or use
Ursachenanalyse
Large internal stress generated during molding; mold temperature too low <120°C, quenching freezes the stress; the product geometry has stress concentration features such as sharp corners
Lösung
Increase the mold temperature to 150-180°C to slow cooling; anneal the product after demolding at 200°C/2h to eliminate internal stress; optimize product design to avoid sharp corners and abrupt cross-section changes
Wichtigste Erkenntnis
Annealing is an effective method to eliminate internal stress and prevent cracking in PEI products
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