Molds & Tooling
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PC Black Specks (Carbonized Spots)
Fenómeno del problema
Small black specks appear in transparent or light-colored PC parts, randomly distributed, zero tolerance on transparent parts.
Análisis de la causa
Material accumulated in hot runner dead corners and barrel dead corners carbonizes and falls off at high temperature; incomplete purging during material change and raw material contamination also introduce black specks; PC's high processing temperature makes dead-corner accumulated material easier to carbonize.
Solución
①Clean hot runner and nozzle dead corners; ②Avoid long shutdowns with heat preservation; ③Use purging material to thoroughly replace during material change; ④Check raw material cleanliness; ⑤Establish a regular purging and maintenance system.
Conclusión clave
Transparent PC's tolerance for black specks is zero: dead-corner treatment must be normalized and institutionalized; intermittent black specks are a typical feature of dead-corner carbon deposits, and purging is far more effective than adjusting the process.
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