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