Injection Molding
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Periodic EVOH Surface Ripples
Problem Phenomenon
Periodic ripples with 5-15mm spacing on EVOH product surfaces
Cause Analysis
Injection speed periodic fluctuation; hydraulic system unstable; screw speed unstable
Solution
1) Overhaul injection system to stabilize pressure and speed; 2) Servo motor drive replacing 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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