Processing Machinery
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Improper selection of processing temperature window for polyolefin plastomer polyolefin plastomer
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.
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 thermally degrades and the molecular weight decreases
（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）Material grade differences and MFR changes are not considered
（5）Ambient temperature changes are not adjusted in time
Solución
（1）Reasonably set the temperature range according to the characteristics of the polyolefin plastomer: 180-230°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 manual operation differences
Conclusión clave
The selection of the temperature window is the foundation of processing, and it needs to be reasonably set according to the material characteristics and actual operating experience.
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