Injection Molding
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PEI Injection Speed Management
Problem Phenomenon
Improper PEI injection speed settings cause filling defects or shear problems; the speed window is difficult to grasp.
Cause Analysis
PEI's high viscosity requires a relatively high injection speed, recommended at 50~80% of the screw's maximum speed; too fast causes shear heat and air entrapment; too slow causes front freezing and short shots; multi-stage injection balance.
Solution
①Injection speed in the range of 50~80% of the screw's maximum speed; ②multi-stage injection curve optimization; ③appropriate speed control in the gate area; ④verify filling status with short shot tests.
Key Takeaway
The 50~80% of PEI injection speed is quantitative guidance; multi-stage curves are a refined means; short shot tests provide intuitive verification.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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