Processing Machinery
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ABS back pressure and shear heat
Problem Phenomenon
[Problem phenomenon] ABS back pressure too high, shear heat accumulation, melt discoloration and butadiene degradation
Cause Analysis
Back pressure 5-15MPa is enough to ensure uniform plasticization; excessive back pressure shear heat degrades the butadiene phase; screw speed 40-70rpm medium speed; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
Back pressure set at 5-15MPa; screw medium speed; check back pressure and speed first upon discoloration; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
ABS back pressure 5-15MPa and screw medium speed, shear heat destroys butadiene; 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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