Dyeing property of plasma-treated wool with direct dyes.

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Abstract
Merino wool was treated with low temperature plasma of oxygen and tetrafluoromethane for 30 and 180s, and then dyed with two direct dyes, C. I. Direct Red 2 and C. I. Direct Blue 1. The pretreatment increased not only the rate of dyeing but also the saturation dye exhaustion in the same manner as in the dyeing with milling type acid dyes. Barrier effect at the beginning of dyeing of untreated wool was decreased by the plasma treatment. From these results, it seems likely that the surface of endocuticle or adhesive filler in interscale of wool was relaxed by the plasma treatment and as a result the rate of dyeing and saturation dye exhaustion were increased.

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