Injection Molding
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Multi-stage Injection of PLA Products
Problem Phenomenon
Unreasonable speed curve.
Cause Analysis
A single speed is hard to balance everything; PLA requires a refined curve.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
①Multi-stage injection; ②Initial stage to prevent jetting; ③Middle stage filling; ④Final stage to prevent overfilling and degradation.; After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Multi-stage injection protects PLA from shear damage.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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