Extrusion & Post
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DSTDP extrusion die deposit and carbon buildup
Problem Phenomenon
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
Cause Analysis
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
Solution
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
Key Takeaway
Die carbon buildup is caused by thermo-oxidation and untimely cleaning; PE flushing and timely cleaning are key
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