Molds & Tooling
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PA66 jetting marks
Problem Phenomenon
Snake-shaped patterns extend from the gate of PA66 products
Cause Analysis
After entering the cavity at high speed, the melt does not contact the wall and forms free jetting, and the jet folds and cools leaving snake-shaped marks; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Aim the gate at the core or mold wall; reduce first-stage speed; fan gate buffering; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Jetting marks are solved from the gate-to-wall relationship and speed curve; 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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