Molds & Tooling
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PA66 internal shrinkage voids
Problem Phenomenon
Internal shrinkage voids found in sliced PA66 thick-wall parts, strength fails to meet standard
Cause Analysis
Insufficient core feeding at thick walls forms shrinkage voids, premature gate freezing or insufficient holding pressure is the main cause; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Thicken the gate to extend feeding time; calculate holding pressure and time according to wall thickness; raise mold temperature to delay surface solidification; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Thick-wall shrinkage voids are guaranteed by feeding channels and holding pressure system; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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