Injection Molding
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PA6 '2079851475616104452 Black Specks
Problem Phenomenon
Black specks and black streaks, obvious on light-color parts.
Cause Analysis
Dead corner carbonization (PA carbonization is obvious at high temperature), raw material contamination; high-temperature nylon dead corner accumulated material easily carbonizes; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Thoroughly clean the machine to remove accumulated material in the dead corners of the barrel and hot runner;②avoid long-time high-temperature idling heat preservation of the barrel;③check the cleanliness of raw material and regrind to eliminate pollution sources;④use purging material to thoroughly replace during material change;⑤establish a regular machine cleaning and maintenance system to prevent dead corner material accumulation.
Key Takeaway
PA6 black specks = 'carbonization': dead corners are the root; nylon processing temperature is high, dead corner accumulated material carbonizes quickly, and machine cleaning and maintenance must be normalized; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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