Injection Molding
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PPO injection pressure setting
Problem Phenomenon
When the injection pressure of PPO products is low, the filling is not full, and when the pressure is too high, flash and internal stress are produced, making the pressure parameter difficult to choose.
Cause Analysis
The high melt viscosity of PPO requires a high injection pressure of 100~140MPa to overcome the mold filling resistance; but high pressure is accompanied by flash risk and stress freezing; gate size and clamping force are the boundary conditions of pressure.
Solution
①Set the injection pressure in the 100~140MPa range; ②take 40~60% of the injection pressure as the holding pressure; ③calculate the clamping force to match the high-pressure process; ④use multi-stage injection to balance filling and stress.
Key Takeaway
PPO's high pressure requirement is determined by the material viscosity; the 40~60% holding pressure ratio is an empirical benchmark; clamping force calculation cannot be omitted.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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