Processing Machinery
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ASA back pressure kept low
Problem Phenomenon
ASA back pressure improper, shear heat and degradation, low back pressure principle.
Cause Analysis
ASA back pressure should be kept as low as possible; high back pressure shear heat; although ASA can withstand high shear, protect the rubber phase; plasticization quality; melt temperature.; During on-site investigation, verify item by item according to this mechanism, avoid blindly adjusting the machine based on experience alone
Solution
①Back pressure kept at low level; ②for insufficient plasticization, prioritize raising temperature; ③melt temperature monitoring; ④rubber phase protection.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA low back pressure is a material protection principle; temperature replacing back pressure is the correct path; monitoring prevents deviation.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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