Effects of Pretreatment and Penetrating Agent on the Dyeing Property of the Hanji Yarn

Knitted fabrics made from the Hanji yarn occasionally experience serious dyeing problems due to the color difference (ΔE) between the regular and defective parts/regions, owing to the fiber fineness. This study investigates the effects of pretreatment and a penetrating agent on the dyeing properties of the Hanji knit fabrics to solve the color variation problem. We found that the use of a penetrating agent increased the water absorption of the Hanji yarn, while pretreatment using a surfactant (Sera Wash®) and sodium hydroxide had more significant effects. Additionally, strong bleaching using hydrogen peroxide (25 g/l) reduced the color difference between the regular and defective parts/regions, thus improving the dyeing properties without significant loss of tensile strength.

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Effects of Pretreatment and Penetrating Agent on the Dyeing Property of the Hanji Yarn

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