Material Analysis
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ASA bone white part color difference
Fenómeno do problema
Color difference fluctuates between batches of ASA light-colored outdoor parts, ΔE value exceeds the standard, color powder batch and processing temperature are both suspected but the true cause is not located.
Análise das causas
ASA light-colored part color difference is sensitive to color powder dispersion, processing temperature and residence time; different rubber phase thermal history affects the base color; insufficient temperature resistance grade of color powder causes discoloration in local overheated areas.
Solução
①Color powder temperature resistance grade matches ASA processing temperature; ②fix process parameters to reduce thermal history differences; ③color masterbatch replaces color powder to improve dispersion stability; ④color difference meter batch full inspection with SPC control.
Conclusão principal
ASA color difference treatment must first distinguish color powder problems from thermal history problems; the color masterbatch route has better stability; SPC data helps locate real variation sources.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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