Injection Molding
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PCL injection speed control
Problem Phenomenon
PCL injection speed too fast causes shear degradation or too slow causes insufficient filling; grasping the window.
Cause Analysis
PCL has high viscosity and shear sensitivity; excessive speed causes shear heat and degradation; too slow causes flow front freezing; multi-stage injection demand; structural complexity.；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Multi-stage injection speed curve; ②Shear rate control; ③Filling state monitoring; ④Structural adaptation.；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Multi-stage management of PCL injection speed is the standard; balance of shear and filling; monitoring ensures quality.；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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