Processing Machinery
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Large barrel temperature fluctuation in heat-resistant polyethylene heat-resistant polyethylene processing (Variant: strengthened measures)
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.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Cause Analysis
(1) Aging of heating rings causes insufficient or uneven heating power
(2) Thermocouple damaged or improperly installed, inaccurate temperature measurement
(3) Improper PID parameter setting of temperature control instrument
(4) Cooling fan failure causes barrel overheating
(5) Large ambient temperature changes affect temperature control accuracy
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solution
(1) Check and replace aged heating rings to ensure uniform heating of each section
(2) Check thermocouple position and integrity, replace damaged ones
(3) Optimize PID parameters of temperature control instrument, control accuracy ±2°C
(4) Ensure cooling fans work normally, install air conditioning to maintain ambient temperature if necessary
(5) Install insulation covers to reduce heat loss
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Key Takeaway
Barrel temperature fluctuation is caused by heating or temperature control system failure, and heating rings, thermocouples and temperature control instruments need to be regularly inspected and maintained.
Targeted preventive measures need to be taken in different production scenarios.
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