Injection Molding
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Deformation aging out-of-tolerance of PP injection molded parts
Problembeschreibung
Products produced with the same mold in different seasons have dimensional differences.
Ursachenanalyse
Ambient temperature affects mold temperature stability and cooling efficiency; the crystallization behavior of PP is sensitive to temperature, and seasonal temperature differences are converted into dimensional differences.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Lösung
①Constant temperature control with the mold temperature controller; ②establish seasonal process cards; ③monitor the workshop temperature; ④SPC management of key dimensions.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Wichtigste Erkenntnis
Seasonal fluctuation must be eliminated by constant temperature control; SPC can detect dimensional drift trends early.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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