Injection Molding
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EVA '2079851475616104452 flash
Problem Phenomenon
Flash on the parting line of the product.
Cause Analysis
EVA has good flowability and easily penetrates the parting line gap under high pressure; insufficient clamping or mold wear aggravates it.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Check the clamping force; ②overhaul the parting line; ③lower the injection pressure; ④optimize the holding pressure curve.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Flash control is investigated according to clamping and mold condition; the low viscosity of EVA requires stricter parting line precision.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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