Injection Molding
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PC multi-stage injection application
Problem Phenomenon
【Problem Phenomenon】PC single injection speed, jetting and shear heat coexist
Cause Analysis
PC multi-stage injection: slow speed at the gate to prevent jetting, medium speed in the middle section for filling, slow speed at the end section for venting and preventing burning; avoid local high shear degradation；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Three-level or more speed curve; gate slow, middle medium, end slow; avoid high-speed shear；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability；Change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PC multi-stage injection controls shear, slow entry, stable middle, slow finish；After confirming effectiveness, solidify 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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