Injection Molding
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PLA '2079851475616104452 Weld Lines
Fenómeno do problema
Low strength at the weld lines of PLA products, brittle fracture along the weld lines under load
Análise das causas
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
Solução
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
Conclusão principal
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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