Injection Molding
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LLDPE '2079851475616104452 weld line
Problem Phenomenon
LLDPE injection molded parts have better weld line strength than LDPE, but multi-gate still needs optimization
Cause Analysis
LLDPE's short-chain branching gives better melt front joining quality than LDPE; weld line strength is relatively high; but gate location still needs to avoid load-bearing areas; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Optimize gate location to position weld lines; ②raise mold temperature to improve joining quality; ③verify weld line strength on structural parts; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LLDPE weld line performance is better than LDPE; but design avoidance remains a basic requirement for structural parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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