Molds & Tooling
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PP Jetting Mark
Problem Phenomenon
When the gate faces an open cavity, snake-like marks appear on the part surface.
Cause Analysis
Melt jetted at high speed from the gate folds and piles up without hitting a wall; excessive initial speed and small gate are the main causes.
Solution
①Change gate direction so the flow hits a wall; ②start slow then speed up; ③enlarge the gate.
Key Takeaway
Hit the wall first then spread—jetting marks come no more.
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