Molds & Tooling
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POM thick-wall mold temperature
Problem Phenomenon
POM thick-walled parts have internal shrinkage cavities and fail strength testing
Cause Analysis
The surface layer of a thick-walled part solidifies first, and the feeding to the core is interrupted, forming shrinkage cavities; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Raise the mold temperature to 100°C to delay solidification; enlarge the gate; extend the holding time according to wall thickness; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Thick-wall shrinkage cavities rely on high mold temperature plus sufficient holding pressure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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