Extrusion & Post
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Unstable Frost Line in LDPE Blown Film
Fenómeno do problema
The frost line height fluctuates up and down, and film performance fluctuates.
Análise das causas
Air ring cooling amount fluctuation, extrusion output fluctuation, ambient temperature change; unstable frost line causes crystallization and orientation fluctuation.
Solução
①Stabilize air ring air volume and air temperature; ②stabilize extrusion output; ③control ambient temperature; ④include frost line height in SOP monitoring.
Conclusão principal
The frost line is the thermometer of the blown film process.
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