Injection Molding
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PA66 '2079851475616104452 measured melt temperature exceeding standard
Problem Phenomenon
Settings compliant but melt temperature high, products turn yellow.
Cause Analysis
Shear heat (high speed and high back pressure); actual melt temperature far exceeds the setting; PA66 is sensitive to over-temperature; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Reduce screw speed and back pressure to reduce shear heat generation; ②measure actual melt temperature with temperature measurement means and calibrate process settings; ③evaluate whether screw compression ratio and mixing capability match this material; ④optimize screw speed and back pressure combination, balancing plasticizing and shear heat; ⑤include actual melt temperature in process monitoring to detect abnormalities in time.
Key Takeaway
PA66 melt temperature='setting + shear': measurement is the truth; narrow-window nylon has zero tolerance for over-temperature, actual melt temperature must be monitored; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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