Processing Machinery
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Improper Selection of the Processing Temperature Window for Block Copolymer Polypropylene Block Copolymer Polypropylene
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, 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）The differences in material grades and MFR changes are not considered
（5）Environmental temperature changes are not adjusted in time
Solução
（1）Reasonably set the temperature range according to the characteristics of block copolymer polypropylene: 200-270°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 an infrared temperature gun
（4）After testing the MFR of each batch of raw material, fine-tune the temperature as needed
（5）Establish standardized process parameter cards to reduce differences in manual operation
Conclusão principal
The selection of the temperature window is the basis of processing, and needs to be reasonably set according to material characteristics and actual operating experience.
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