Injection Molding
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PA66 burnt three factors
Problem Phenomenon
Product ends and rib positions are charred and underfilled, and carbon deposits yellow at corresponding mold positions
Cause Analysis
PA66 burning is caused by the superposition of three factors: melt temperature or mold temperature too high, injection speed and screw shear too strong, and poor venting; high-temperature shear plus gas trapping makes the local melt reach the ignition point
Solution
①Reduce barrel temperature and injection speed; ②Reduce screw speed to reduce shear heat; ③Add and clean vent grooves, reduce speed for end filling; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Burning treatment investigates item by item according to the three factors of temperature, shear, and venting; most cases are the superposition of the three, and single-item adjustment is often not enough; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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