Injection Molding
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PLA '2079851475616104452 Weld Lines
Problem Phenomenon
Low strength at the weld lines of PLA products, brittle fracture along the weld lines under load
Cause Analysis
PLA brittleness makes weld lines a more dangerous weak zone; the merging quality of the melt fronts is affected by temperature; a gate layout that places weld lines in load-bearing areas is a design error
Solution
①Increase melt and mold temperature to improve merging; ②Shift the weld lines by gate position; ③Especially avoid weld lines in load-bearing areas for brittle materials; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The risk of PLA weld lines is amplified by brittleness; position shifting is more reliable than process remediation; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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