Processing Machinery
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Metallocene linear low density polyethylene metallocene linear low density polyethylene improper processing temperature window selection
Problem Phenomenon
Unreasonable barrel or die head temperature settings cause poor material plasticization quality, degradation or incomplete melting.
Temperature window selection directly affects melt quality and final product performance.
Cause Analysis
（1） Temperature set too low, melt viscosity high and plasticization insufficient\
（2） Temperature set too high, material thermally degrades and molecular weight decreases\
（3） Unreasonable temperature distribution across sections, feed section temperature too high or plasticizing section temperature too low\
（4） Material grade differences and MFR changes not considered\
（5） Ambient temperature changes not adjusted in time
Solution
（1） Reasonably set the temperature range according to metallocene linear low density polyethylene characteristics: 190-260°C\
（2） Barrel temperature gradually increases from the feed section to the metering section, but does not exceed the upper limit temperature\
（3） Regularly calibrate the actual barrel temperature with a thermometer or infrared temperature gun\
（4） Test the MFR of each batch of raw material and fine-tune the temperature as needed\
（5） Establish standardized process parameter cards to reduce manual operation differences
Key Takeaway
Temperature window selection is the foundation of processing, and needs to be set reasonably according to material characteristics and actual operating experience.
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