Processing Machinery
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POM back pressure low limit
Problem Phenomenon
If the back pressure is too low, metering is unstable and product weight fluctuates; if too high, the nozzle drools and plasticization is slow
Cause Analysis
POM back pressure gauge pressure is 5-10kg/cm²: too low causes air entrainment and unstable metering; too high causes nozzle drooling, extended plasticization time, and shear heat accumulation approaching the degradation zone
Solution
①Control the back pressure at 5-10kg/cm² (about 0.5-1MPa); ②for metering fluctuations, first check the back pressure and screw condition; ③when drooling occurs, check the back pressure and nozzle temperature
Key Takeaway
The POM back pressure window is narrow and low; 5-10kg/cm² is the balance point between metering stability and drool prevention; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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