Extrusion & Post
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PVDF Flame Retardant Grade Scorch and Dead Spots
Fenómeno do problema
【Problem phenomenon】Flame retardant PVDF grades repeatedly show scorched black specks during extrusion, recurring even after material change and cleaning
Análise das causas
Flame retardant PVDF is extremely prone to local overheating and scorching in equipment with dead spots, grooves, and stagnation areas; Arkema explicitly requires thoroughly eliminating dead spots and thoroughly cleaning the screw, barrel, and die head before running flame retardant grades
Solução
Modify to eliminate dead spots and grooves in the screw and die head; thoroughly clean the equipment before running; empty the flame retardant material before shutdown and clean with non-flame retardant material, and use HDPE or acrylic cleaning material when changing to other materials
Conclusão principal
Flame retardant PVDF fears dead spot stagnation; equipment cleaning and structural modification must come first; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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