Molds & Tooling
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ABS black specks (carbonized specks)
Problem Phenomenon
Black small specks appear randomly on the surface or inside the product, especially obvious on white and light-colored parts, appearing intermittently.
Cause Analysis
Accumulated material carbonizes and falls off in dead corners of the barrel, nozzle, or hot runner; raw material contamination or mixing of other materials; carbonized particles in the regrind; long-term high-temperature residence can also cause local degradation and discoloration of ABS.
Solution
①Thoroughly purge the machine and disassemble and clean the nozzle/hot runner; ②check the cleanliness of raw material and regrind; ③avoid long-term high-temperature idling and heat preservation; ④use dedicated purging material when changing material; ⑤focus on equipment dead corners for intermittent black specks.
Key Takeaway
ABS black specks mostly come from dead corner carbon deposits or material source contamination: purging is more effective than adjusting parameters; intermittent appearance is a typical feature of dead corner accumulated material, don't treat an equipment problem as a process problem.
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