Injection Molding
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PC injection pressure 100-150MPa
Problem Phenomenon
Thin-walled parts underfilled with short shots, or flash, mold expansion, and demolding difficulty
Cause Analysis
PC melt viscosity is high, requiring higher injection pressure to drive filling; thin-walled long-flow parts need 120-145MPa; but excessive pressure will expand the mold producing flash and greatly increase residual stress
Solution
①Injection pressure set at 100-150MPa adjusted according to wall thickness and flow length; ②Holding pressure takes 50-75% of injection pressure; ③Cooperate with multi-stage speed control to reduce end pressure
Key Takeaway
PC's high viscosity determines high pressure demand; pressure just sufficient is enough, excessive pressure brings stress and flash, requiring fine grading according to structure；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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