Injection Molding
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PPS injection speed medium speed
Problem Phenomenon
After high-speed injection, the product end is burnt and flashes, while low speed causes weld lines and insufficient filling
Cause Analysis
PPS melt has good flowability but high-speed injection produces shear heat and air trap burning; low speed causes flow front cooling and obvious weld lines; medium speed as the main, appropriately faster for thin-walled parts is the conventional strategy
Solution
①Injection speed based on medium speed; ②appropriately increase speed for thin-walled long-flow parts; ③reduce speed at the end to prevent air trap burning; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS speed strategy is medium-speed keynote plus end deceleration; the balance of shear heat and weld lines relies on segmented curves; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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