Processing Machinery
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SMMA Back Pressure Management
Problem Phenomenon
SMMA back pressure too high causing shear heat or too low causing uneven plasticization, low back pressure principle.
Cause Analysis
SMMA back pressure recommended at low level; high back pressure causes shear heat and degradation; low back pressure causes uneven plasticization; balance between mixing demand and protection.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①Keep back pressure at low level; ②prioritize raising temperature when mixing is insufficient; ③melt temperature monitoring; ④plasticization quality check.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
SMMA low back pressure is the material protection principle; temperature replacing back pressure is the correct path; monitoring prevents deviation.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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