Processing Machinery
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Improper selection of the processing temperature window for heat-resistant polyethylene heat-resistant polyethylene (Variant: strengthened measures)
Fenómeno del 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.
In particular, extra attention is needed on the original basis, this problem is more prominent and needs key attention.
Análisis de la causa
（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
（6）On the original basis, extra attention is needed: process parameter fluctuations or equipment status changes have aggravated this problem
Solución
（1）Reasonably set the temperature range according to the characteristics of heat-resistant polyethylene: 190-230°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
（6）And strengthen process monitoring; on the original basis, extra attention is needed, with special attention to parameter stability
Conclusión clave
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.
In different production scenarios, targeted preventive measures need to be taken.
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