Processing Machinery
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PET barrel temperature zoning
Fenómeno do problema
PET plasticizing is uneven, and unmelted gel particles are entrained in the preforms
Análise das causas
The barrel temperature gradient is unreasonable, and insufficient temperature in the compression section leaves the chips not completely melted, with highly crystalline particles remaining; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
Set the barrel at 265℃ for the rear section, 275℃ for the middle section, and 280℃ for the front section; appropriately increase the back pressure; regularly check screw wear; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
The temperature gradient and back pressure ensure complete PET plasticizing; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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