Processing Machinery
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PVDF Melt Temperature Degradation
Problembeschreibung
The product discolors and turns yellow, produces black specks, accompanied by a pungent odor.
Ursachenanalyse
PVDF begins thermal decomposition and releases HF when the processing temperature exceeds about 300℃; loss of temperature control or excessive residence accelerates decomposition.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Lösung
①Control the melt temperature within the 230~290℃ window; ②strictly prohibit exceeding 300℃; ③shorten the residence time; ④immediately lower the temperature, clean the machine, and ventilate after decomposition.
Wichtigste Erkenntnis
PVDF thermal decomposition releasing HF poses both quality and safety risks; 300℃ is an insurmountable red line.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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