Processing Machinery
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PET raw material inlet temperature too low
Problem Phenomenon
AA content and energy consumption rise simultaneously and plasticizing time becomes longer; troubleshooting finds that the temperature setting of the cooling section at the barrel feed opening is too low.
Cause Analysis
When the temperature at the pellet inlet is too low, material plasticizing relies more on screw shear heat generation, and excessive shear heat instead aggravates PET thermal degradation, with the AA generation rising accordingly.
Solution
①Appropriately increase the temperature of the rear barrel section and the inlet; ②optimize the screw speed and back pressure to reduce shear; ③monitor the actual melt temperature rather than only looking at the set value; ④verify the AA change trend.
Key Takeaway
Too low an inlet temperature indirectly pushes up AA through shear heat; the temperature setting must take into account both plasticizing efficiency and thermal degradation, and the actually measured melt temperature is the judgment basis.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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