Extrusion & Post
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DSTDP extrusion die deposit and carbon buildup
Problembeschreibung
After DSTDP extrusion shutdown, a brown carbon deposit layer is found on the die inner wall, and black specks appear on the product surface after restarting
Ursachenanalyse
DSTDP stays in the die residence zone for a long time, heated, oxidatively decomposed and carbonized; the die not cleaned in time during shutdown; extrusion temperature on the high side accelerates carbonization
Lösung
1) Before shutdown, flush the die with pure PE for 3-5min to remove DSTDP residue; 2) disassemble and clean the die immediately after shutdown; 3) lower extrusion temperature by 5-10°C to reduce carbonization tendency; 4) optimize die flow channel to reduce dead corners in residence zones
Wichtigste Erkenntnis
Die carbon buildup is caused by thermo-oxidation and untimely cleaning; PE flushing and timely cleaning are key
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