Processing Machinery
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Improper processing temperature window selection for linear low density polyethylene linear low density polyethylene (Variant: strengthened measures)
Fenómeno do problema
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.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires key attention.
Análise das causas
(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
(6) On the original basis, additional attention is needed as process parameter fluctuations or equipment status changes have aggravated this problem
Solução
(1) Reasonably set the temperature range according to linear low density polyethylene characteristics: 190-250°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
(6) And strengthen process monitoring; on the original basis, additional attention is needed, with special attention to parameter stability
Conclusão principal
Temperature window selection is the foundation of processing; it needs to be reasonably set according to material characteristics and practical operation experience.
Targeted preventive measures need to be taken in different production scenarios.
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