Processing Machinery
4 조회수
Metallocene linear low density polyethylene metallocene linear low density polyethylene large barrel temperature fluctuations during processing（Variant: Startup Commissioning Scenario）
문제 현상
The actual temperature of each barrel section deviates greatly from the set value, and the melt quality fluctuates.
Temperature fluctuations cause instability in product dimensions, appearance and mechanical properties.In particular, during new machine commissioning or the initial startup period, this problem is more prominent and requires key attention.
원인 분석
（1） Aging of heater bands causes insufficient or uneven heating power\
（2） Thermocouple damaged or improperly installed, causing inaccurate temperature measurement\
（3） Improper PID parameter settings of the temperature control instrument\
（4） Cooling fan failure causes barrel overheating\
（5） Large ambient temperature changes affect temperature control accuracy\
（6） During new machine commissioning or the initial startup period, process parameter fluctuations or equipment status changes aggravate this problem
해결 방법
（1） Check and replace aged heater bands, ensure uniform heating of each section\
（2） Check thermocouple position and integrity, replace damaged ones\
（3） Optimize temperature control instrument PID parameters, control accuracy ±2°C\
（4） Ensure the cooling fan works normally, install air conditioning if necessary to maintain ambient temperature\
（5） Install insulation covers to reduce heat loss\
（6） And do well in parameter recording and archiving, paying special attention to parameter stability during new machine commissioning or the initial startup period
핵심 요약
Barrel temperature fluctuation is caused by heating or temperature control system failures, requiring regular inspection and maintenance of heater bands, thermocouples and temperature control instruments.Targeted preventive measures need to be taken in different production scenarios.
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