Processing Machinery
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Improper processing temperature window selection of heat-resistant polyethylene heat-resistant polyethylene
Fenómeno do problema
The barrel or die head temperature setting is unreasonable, resulting in poor plasticizing quality, degradation or incomplete melting of the material.
Temperature window selection directly affects melt quality and final product performance.
Análise das causas
(1) Temperature setting too low, melt viscosity high and plasticization insufficient
(2) Temperature setting too high, material thermally degraded and molecular weight reduced
(3) Unreasonable temperature distribution of each section, feeding 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
Solução
(1) Reasonably set the temperature range according to heat-resistant polyethylene characteristics: 190-230°C
(2) Barrel temperature gradually increases from feeding section to homogenizing 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 MFR of each batch of raw material and fine-tune temperature as needed
(5) Establish standardized process parameter cards to reduce manual operation differences
Conclusão principal
Temperature window selection is the basis of processing and needs to be set reasonably according to material characteristics and actual operating experience.
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