Processing Machinery
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Improper selection of the processing temperature window for general-purpose polyethylene general-purpose polyethylene
Fenómeno do problema
The barrel or die head temperature is set unreasonably, resulting in poor plasticization quality, degradation, or incomplete melting of the material.
The selection of the temperature window directly affects the melt quality and the final product performance.
Análise das causas
（1）The temperature is set too low, the melt viscosity is high, and the plasticization is insufficient
（2）The temperature is set too high, and the material is thermally degraded and the molecular weight is reduced
（3）The temperature distribution of each section is unreasonable, the feeding section temperature is too high or the plasticizing section temperature is too low
（4）The material grade differences and MFR changes are not considered
（5）The ambient temperature change is not adjusted in time
Solução
（1）Reasonably set the temperature range according to the characteristics of general-purpose polyethylene: 160-260°C
（2）The barrel temperature gradually increases from the feeding section to the 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 the MFR of each batch of raw material and fine-tune the temperature as needed
（5）Establish standardized process parameter cards to reduce human operation differences
Conclusão principal
The selection of the temperature window is the basis of processing, and needs to be reasonably set according to the material characteristics and actual operating experience.
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