Injection Molding
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Jetting marks/snake patterns on products
Problem Phenomenon
Twisted snake-like patterns appear on the product surface, extending from the gate
Cause Analysis
Gate size is too small, causing a melt jetting effect; the melt jets when entering the cavity instead of advancing smoothly; injection speed is set improperly
Solution
Enlarge gate size to eliminate jetting; change to a fan gate or side gate; adjust injection speed to achieve advancing filling (slow first, then fast)
Key Takeaway
Jetting marks are a sign of improper filling flow pattern
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