Injection Molding
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PC/ABS Flow Marks
Problem Phenomenon
High-gloss PC/ABS housing surfaces show corrugated streaks along the flow direction, affecting appearance.
Cause Analysis
The melt front cools too fast during filling, leaving flow marks; low mold temperature and low injection speed are common causes; unstable front temperature and speed both show marks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Increase the mold temperature within the recommended range; ②Increase injection speed to maintain front temperature; ③Verify the melt temperature matches the grade; ④Optimize the injection speed curve to keep the melt front advancing steadily; ⑤Enlarge the gate.
Key Takeaway
PC/ABS flow marks = 'front cools too fast': raising temperature and speed is the main line; high-gloss housings have the highest requirements for front management, and the matching of speed and temperature needs repeated refinement.
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