Processing Machinery
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Improper processing temperature window selection for low density polyethylene low density polyethylene
Problem Phenomenon
Unreasonable barrel or die head temperature settings cause poor plasticizing quality, degradation, or incomplete melting of the material.
Temperature window selection directly affects melt quality and final product performance.
Cause Analysis
(1) Temperature set too low; high melt viscosity, insufficient plasticization
(2) Temperature set too high; material thermal degradation reduces molecular weight
(3) Unreasonable temperature distribution across zones; feed zone temperature too high or plasticizing zone 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 low density polyethylene characteristics: 160-220°C
(2) Barrel temperature gradually increases from feed zone to homogenizing zone, but does not exceed the upper limit temperature
(3) Regularly calibrate actual barrel temperature with a thermometer or infrared temperature gun
(4) Test MFR for each batch of raw material and fine-tune temperature as needed
(5) Establish standardized process parameter cards to reduce human operation differences
Key Takeaway
Temperature window selection is the foundation of processing; it needs to be reasonably set according to material characteristics and practical operation experience.
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