Molds & Tooling
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PA6 Snake-Shaped Jetting Marks
Problem Phenomenon
Snake-shaped curved marks start from the gate of thin-wall PA6 products and extend along the flow direction
Cause Analysis
After passing the gate at high speed, the melt jets directly into the cavity space without contacting the mold wall, and the jet stream folds and cools to form snake-shaped marks, which most easily occurs when the gate faces an open cavity
Solution
Adjust the gate position so the melt contacts the mold wall or core immediately upon entering the cavity; reduce the initial injection speed; use fan or overlap gates to avoid free jetting; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The root of jetting marks is that the melt has no support when entering the cavity, and changing the gate-to-wall relationship is most effective; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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