Molding Process
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PA12 Shrinkage Depression and Wall Thickness Upper Limit
Problem Phenomenon
【Problem phenomenon】PA12 thick-wall products had surface depressions and internal voids, with poor compensation effect
Cause Analysis
Insufficient product density, gas contained in the melt, excessively thick wall, and large thermal shrinkage jointly cause depressions; nylon process essentials clearly state that product thickness should not exceed 7-10mm
Solution
Control wall thickness within 7-10mm, reduce material and add ribs in thick areas; increase the melt amount, raise injection pressure, and extend injection time; fully dry and vent; lower barrel and mold temperature
Key Takeaway
For thick-wall depressions, first reduce material; the 7-10mm wall thickness upper limit is a design red line; after confirming effectiveness, solidify 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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