Method for dyeing nylon filaments

Details Method for dyeing nylon filaments Method for dyeing nylon filaments

D - Textiles, Paper

06

P

D06P 1/40 (2006.01) A46D 1/04 (2006.01) D06P 1/00 (2006.01) D06P 3/06 (2006.01) D06P 3/24 (2006.01)

Patent

CA 2109935

A method for dyeing nylon filaments for use in wear-indicating toothbrushes includes immersing a batch of a first nylon filament for between 10 minutes and 80 minutes in an aqueous solution containing between 0.01% and 0.19% weight to volume of Indigotine dye, said solution having a pH between 1 and 7 and having a temperature between 50°C and 90°C, the dye penetrating into the filament to color an outer cross-sectional region and not penetrating into an inner cross-sectional region of the filament; removing the batch of the first nylon filament from the solution, and repeating the steps for a batch of a second nylon filament, reusing the same solution.

Procédé permettant de teindre des filaments de nylon destinés à être utilisés pour indiquer l'usure des brosses à dents. Dans ce procédé on plonge une charge d'un premier filament de nylon pendant environ 10 à 80 minutes dans une solution aqueuse contenant environ entre 0,01 % et 0,19 % en poids par rapport au volume de colorant indigotine, le pH de cette solution se situant entre 1 et 7 et sa température étant comprise entre 50 C et 90 C. Le colorant pénètre dans le filament pour colorer une zone externe en coupe transversale mais ne pénètre pas dans une zone interne en coupe transversale dudit filament. On retire la charge de premier filament de nylon de la solution et on recommence ces étapes pour une charge d'un deuxième filament de nylon, en utilisant de nouveau la même solution.

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