The atmospheric pressure plasma (APP) jet was applied to the surface treatment of natural fibers, cotton, wool and silk. From the SEM observation, the wool and silk fibers were found to be slightly damaged after the APP treatment. X-ray photoelectron spectroscopic results showed that the oxygen concentration on the fiber surfaces increased by the APP treatment, especially for wool. Little change in mechanical properties of the fabrics was found, whereas the water wicking into the fabric enhanced after the APP treatment. In the case of the wool fabric, the water wicking remarkably increased and the quick drying did not significantly decrease due to the APP treatment. In the inkjet dyeing of wool fabric with acid dye, the color deepening at the initial stage of dyeing process considerably increased by the APP pre-treatment.
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