Extrusion & Post
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ABS extrusion die lip buildup (die drool)
Problem Phenomenon
After the extrusion runs for a period of time, yellow/brown degraded material accumulates at the die lip, and the plate shows periodic longitudinal line marks.
Cause Analysis
The melt stays and degrades at the edge of the die lip outlet, gradually accumulates and periodically falls off and is pressed into the plate surface; high volatiles in the raw material, lubricant precipitation, or mismatch between outlet temperature and speed will aggravate the buildup.
Solution
①Regularly clean the die lip with a copper brush; ②optimize the outlet section temperature to avoid local overheating; ③check raw '2079851475616104451 and regrind ratio; ④optimize the die lip gap and polishing; ⑤evaluate processing aids to reduce residence.
Key Takeaway
ABS die drool=the accumulation of 'residence degradation': cleaning treats the symptoms, temperature-speed matching treats the root; the interval pattern of periodic scoring lines can be used to deduce the buildup shedding cycle, facilitating the formulation of the maintenance rhythm.
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