Injection Molding
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Severe flash in EVA '2079851475616104452
Problem Phenomenon
EVA injection molded products have parting line flash 0.05-0.1mm with width >2mm requiring secondary trimming
Cause Analysis
Injection pressure too high >80MPa with melt overflowing from parting line; clamping force insufficient; mold parting line fitting gap >0.02mm
Solution
1) Reduce injection pressure to 60-70MPa; 2) Increase clamping force or use larger tonnage '2079851475616104452 machine; 3) Mold fitting gap <0.02mm; 4) Increase melt viscosity to reduce mold penetration tendency
Key Takeaway
Flash is caused by high pressure injection and mold gap; reducing pressure and improving mold fitting are key
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