Extrusion & Post
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PVDF Die Buildup and Drool
Problembeschreibung
【Problem phenomenon】Precipitates gradually accumulate at the extrusion die opening to form buildup, which periodically adheres to the product surface forming scar spots
Ursachenanalyse
Low-molecular components and ingredients with insufficient compatibility in the formulation precipitate and accumulate under the action of die stress and surface energy; Arkema recommends the EXAD 3000 extrusion aid to increase lubrication and reduce die buildup
Lösung
Add EXAD 3000 or similar aids to improve lubrication; optimize die temperature and die lip design to reduce dead spots; regularly clean the die opening and check the compatibility of formulation components
Wichtigste Erkenntnis
Die buildup is treated with special aids plus die temperature control; die cleaning only treats the symptoms; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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