Injection Molding
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Deformation aging out-of-tolerance of PP injection molded parts
Problem Phenomenon
Products produced with the same mold in different seasons have dimensional differences.
Cause Analysis
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
Solution
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
Key Takeaway
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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