Processing Machinery
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TPU melt temperature 180-220℃
Fenómeno do problema
Low melt temperature causes insufficient filling, high melt temperature causes degradation and discoloration, and nozzle drooling
Análise das causas
The TPU melt temperature window is 180-220℃, the higher the hardness the higher the temperature; above 220℃ aromatic TPU begins to depolymerize, and aliphatic TPU also has polymerization/depolymerization risks at 200-220℃
Solução
①melt temperature 180-220℃ adjusted by hardness; ②aromatic TPU strictly not exceeding 220℃; ③actual melt temperature measurement calibrates the set value; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
The temperature window of TPU is wider than PVC but equally sensitive; fine grading by hardness within the 180-220℃ range; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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