Injection Molding
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PC Jetting Marks
Problem Phenomenon
When the gate faces an open cavity, snake-shaped curved marks appear on the product surface, appearing as twisted stripes on transparent parts.
Cause Analysis
After the high-viscosity melt is ejected from the gate at high speed without hitting the wall, the melt strand folds and accumulates in the air; excessive initial injection speed and a small gate are the main causes.
Solution
①Change the gate angle so that the melt stream first hits the cavity wall; ②Reduce the initial injection speed and then speed up; ③Enlarge the gate; ④Increase the mold temperature.
Key Takeaway
Let the melt stream 'stick to the wall first and then spread out', and the jetting marks disappear.
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