Injection Molding
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LLDPE '2079851475616104452 flash
Problem Phenomenon
LLDPE injection molded parts have less flash than LDPE, but flash still occurs when clamping is insufficient
Cause Analysis
LLDPE viscosity is higher than LDPE, with smaller flash tendency; but under high injection pressure of 800-1500bar, insufficient clamping still produces flash; mold wear enlarges the gap
Solution
①Calculate clamping force per high-pressure process; ②ensure parting line fit precision; ③injection pressure only needs to be adequate; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LLDPE's higher viscosity reduces flash risk; but clamping force calculation under high-pressure process still cannot be omitted; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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