Processing Machinery
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Large Barrel Temperature Fluctuation in Polypropylene Processing
Problem Phenomenon
The actual temperature of each barrel section deviates greatly from the set value, and the melt quality fluctuates.
Temperature fluctuation causes unstable product dimensions, appearance, and mechanical properties.
Cause Analysis
(1) Aging of the heating bands leads to insufficient or uneven heating power
(2) The thermocouple is damaged or installed improperly, and the temperature measurement is inaccurate
(3) The PID parameters of the temperature control instrument are set improperly
(4) The cooling fan fails, causing the barrel to overheat
(5) Large environmental temperature changes affect the temperature control precision
Solution
(1) Check and replace aged heating bands to ensure uniform heating of each section
(2) Check the position and integrity of the thermocouple, and replace damaged ones
(3) Optimize the PID parameters of the temperature control instrument, with a control precision of ±2°C
(4) Ensure the cooling fan works normally, and install air conditioning to maintain the environmental temperature when necessary
(5) Install an insulation cover to reduce heat loss
Key Takeaway
Barrel temperature fluctuation is caused by heating or temperature control system faults, and the heating bands, thermocouple, and temperature control instrument need to be regularly checked and maintained.
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