Processing Machinery
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Large barrel temperature fluctuation during low density polyethylene low density polyethylene processing
Problem Phenomenon
The actual temperature of each barrel zone deviates greatly from the set value, and melt quality fluctuates.
Temperature fluctuation causes unstable product dimensions, appearance, and mechanical properties.
Cause Analysis
(1) Heater band aging causes insufficient or uneven heating power
(2) Thermocouple damaged or improperly installed, inaccurate temperature measurement
(3) Improper PID parameter settings of the temperature controller
(4) Cooling fan failure causes barrel overheating
(5) Large ambient temperature changes affect temperature control accuracy
Solution
(1) Check and replace aged heater bands, ensure uniform heating of each zone
(2) Check thermocouple position and integrity, replace damaged ones
(3) Optimize temperature controller PID parameters, control accuracy ±2°C
(4) Ensure cooling fans work normally; install air conditioning when necessary to maintain ambient temperature
(5) Install insulation covers to reduce heat loss
Key Takeaway
Barrel temperature fluctuation is caused by heating or temperature control system failure; heater bands, thermocouples, and temperature controllers need regular inspection and maintenance.
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