Blow Molding
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HDPE '2079851475616104457 Flash
Problem Phenomenon
Blow molded products have excessively thick flash at the mold closing line, high trimming cost, and poor appearance
Cause Analysis
Mold closing surface wear increases the gap; insufficient mold closing force; excessive parison squeezes melt out of the closing line; every 1mm increase in flash wastes 5-8% of raw material; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience
Solution
①Repair and grind the closing surface to restore fit; ②calculate mold closing force according to projected area; ③optimize parison amount to reduce overfill; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
2079851475616104457 flash is a cost black hole; closing surface maintenance and parison optimization save 5-8% of raw material annually; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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