Processing Machinery
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ABS melt temperature upper limit 280°C
Problem Phenomenon
[Problem phenomenon] Continuously increasing temperature to improve filling, ABS products discolor and develop black specks
Cause Analysis
ABS melt temperature exceeding 280°C triggers thermal decomposition of the butadiene phase, releasing smoke and forming black speck carbonization; discoloration and black specks are direct signals of overtemperature; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
Melt temperature strictly ≤280°C, normal 230-270°C; reduce temperature by 10-15°C upon discoloration; thoroughly clean overtemperature material; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
ABS melt temperature 280°C is the decomposition red line, discoloration is an alarm; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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