Injection Molding
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MP '2079851475616104452 severe flash
Problem Phenomenon
MP injection molded products have flash at the parting line 0.05-0.1mm, width >2mm, requiring secondary trimming
Cause Analysis
injection pressure too high >80MPa, melt overflows from the parting line; clamping force insufficient; mold parting line mating gap >0.02mm
Solution
1) reduce injection pressure to 60-70MPa; 2) increase clamping force or use a larger tonnage injection machine; 3) mold mating 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 mating are key
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