Processing Machinery
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PA66 high-temperature carbonization black specks
Problem Phenomenon
Black specks on products, obvious on light-colored parts.
Cause Analysis
Processing above 270℃, retained material in dead corners carbonizes quickly; incomplete material changeover; high-temperature nylon has high carbonization risk; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Clean retained carbonized material in dead corners of the barrel, nozzle and hot runner; ②avoid high-temperature idle running; ③thoroughly purge during material changeover; ④establish a regular machine cleaning and maintenance system to prevent material accumulation in dead corners; ⑤check cleanliness of virgin material and regrind to eliminate contamination sources.
Key Takeaway
PA66 black specks='dead corner carbonization': high-temperature nylon dead-corner material carbonizes extremely fast; machine cleaning and shutdown management must be stricter than ordinary nylon; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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