Injection Molding
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LDPE '2079851475616104452 Flash
Problem Phenomenon
Flash on product edges; the low viscosity of LDPE causes flash even in tiny gaps
Cause Analysis
LDPE melt has low viscosity and good fluidity, and is sensitive to parting line fitting accuracy; injection pressure too high or insufficient clamping causes flash; mold wear enlarges the gap; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Ensure parting line fitting accuracy; ② injection pressure just sufficient is enough; ③ regular mold maintenance to prevent wear; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LDPE flash is the price of low viscosity; mold accuracy and pressure control are the two major defense lines; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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