Molds & Tooling
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PCABS Jetting Marks
Problem Phenomenon
[Problem Phenomenon] PC/ABS snake-shaped jetting marks near the gate
Cause Analysis
The melt jets at high speed through a too small gate directly into the empty cavity; the front folds into marks; 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
Lap fan gates against the wall; gate facing the core; reduce initial speed; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PC/ABS jetting marks rely on gate wall-hitting arrangement; 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 similar problems in the future
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