Molds & Tooling
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PA66 fast solidification holding switchover
Problem Phenomenon
PA66 thin-walled parts have poor holding effect, sink marks and dimensional instability alternate
Cause Analysis
PA66 crystallizes fast and solidifies fast; holding switchover point slightly late and the gate freezes, feeding fails; switching too early causes flash; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Determine the optimal switchover point with cavity pressure or short shot tests; gate freeze time measured actually; switchover position accuracy controlled to millimeter level; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The switchover point of fast-solidification materials must be precisely determined; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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