Injection Molding
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GPPS Transparent Part Flow Marks
Problem Phenomenon
Wavy flow marks appear on the product surface, especially obvious on transparent parts.
Cause Analysis
The melt front cools quickly, and subsequent melt pushes to form ripples; low material temperature and mold temperature and slow injection speed aggravate front cooling.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Appropriately increase melt temperature; ②increase mold temperature; ③increase injection speed; ④enlarge gates and runners.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Flow marks reflect front temperature management problems; PS has good fluidity, and increasing temperature and speed can improve it.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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