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Differences of dyeing properties with acid dye among the portions of cocoon layer

, : Differences of dyeing properties with acid dye among the portions of cocoon layer. Journal of Sericultural Science of Japan 57(2): 114-117

The rates of dye adsorption at the early stage and the adsorption isotherms of acid dye (C.I. Acid Orange 7) on the silk reeled from outer, middle and inner portion of cocoon layer were measured at 40, 50 and C. These raw silk were degummed with the solution containing sodium carbonate and nonionic surfactant. The results obtained were as follows: (1) The saturation value, the standard affinity and the heat of adsorption decreased from outer portion towards inner portion of cocoon layer. (2) The rate of dye adsorption at early stage was higher in the following order; outer portion > inner portion > middle portion. This is because the size of fiber in the inner portion is finer than that in middle portion. From these results, it was proved that differences in the fine structure of the portions of cocoon layer affected the dyeing properties.

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