Injection Molding
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PA66 injection speed strategy
Problem Phenomenon
Pure material at low-speed injection shows short shots and cold marks, while reinforced grades at high-speed injection show floating fibers and jetting
Cause Analysis
PA66 solidifies fast and requires relatively high injection speed to ensure filling; but high speed for glass fiber reinforced grades aggravates fiber orientation and surface floating fibers, and the speed strategies of the two types of grades are opposite
Solution
①Pure PA66 at medium-high speed injection; ②Reinforced grades appropriately reduce speed for surface quality; ③Compensate filling loss from speed reduction with temperature; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PA66 injection speed follows grade-specific strategies; pure material seeks speed, reinforced seeks stability, and temperature is the compensation valve between the two; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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