Molds & Tooling
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Persistent black specks after ABS material change
Fenómeno del problema
After changing from dark-colored material or PVC etc. to ABS, black specks and black streaks appear intermittently for a long time, and cannot be cleaned for a long time.
Análisis de la causa
The previous material remains carbonized in dead corners of the barrel and hot runner and is gradually carried out by the new material; PVC residue encountering ABS processing temperature accelerates carbonization contamination; incomplete purging is the root cause.
Solución
①Use purging material to thoroughly replace at gradient temperatures when changing material; ②disassemble the nozzle and hot runner for cleaning when necessary; ③avoid continuous switching between ABS and PVC on the same machine; ④record and execute the material change purging SOP; ⑤evaluate dedicated purging materials.
Conclusión clave
ABS material change black specks rely on 'SOP prevention' rather than post-adjustment: gradient temperature purging + disassembling and cleaning dead corners are standard actions; cross-switching with PVC is extremely risky, avoid it if possible.
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