Injection Molding
5 views
PEI Flash
Problem Phenomenon
Flash appears on the parting line of PEI products; high-pressure injection and insufficient clamping force act together, making deflashing difficult.
Cause Analysis
PEI injection pressure is relatively high at 80~120MPa; when clamping force is insufficient, the melt squeezes into the parting line; clamping force needs to be calculated at ≥50MPa per projected area; mold wear widens the gap.
Solution
①Calculate clamping force at ≥50MPa per projected area; machines of ≥500 tons are recommended, calculated by area; ②grind and fit the parting line; ③optimize injection pressure not to exceed the necessary value; ④regularly check mold wear.
Key Takeaway
The clamping force calculation for PEI high-pressure processes cannot be omitted; 50MPa specific pressure is a clear standard; mold maintenance prevents gap widening.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
Was this helpful?
0 people found this helpful
Thank you for your feedback!