Injection Molding
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Periodic EAA surface ripples
Problem Phenomenon
Periodic ripples on the EAA product surface with spacing of 5-15mm
Cause Analysis
Injection speed fluctuating periodically; hydraulic system unstable; screw speed unstable
Solution
1) Overhaul the injection system to stabilize pressure and speed; 2) Use servo motor drive instead of hydraulic drive; 3) PID control to stabilize injection parameters
Key Takeaway
Ripples are caused by unstable injection; equipment overhaul and PID control are key
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