Injection Molding
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PCABS injection speed grading
Problem Phenomenon
【Problem Phenomenon】PC/ABS single injection speed loses one thing for another, flow marks and shear heat coexist
Cause Analysis
Multi-stage injection is the PC/ABS standard: slow speed at the gate to prevent jetting, medium-fast speed in the middle section for filling, slow speed at the end for venting and preventing burning; too fast causes shear heat degradation, too slow causes flow marks
Solution
Adopt a speed profile of three or more stages; slow at gate - fast in middle - slow at end; refine grading for complex parts; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC/ABS multi-stage injection: slow entry, fast middle, slow finish; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems later
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