Abstract
Poly(ethylene terephthalate)(PET) fiber reflects a large quantity of light from the surface of the fiber. Because it's refractive index is greatly different from that of air. So in case of dyeing dark shade by black or other dolors. It is difficult to obtain full shade. Especially the micro fiber is very hard to obtain dark shade due to its large surface area, which reflects the most of incident lights. The low temperature 02 plasma or the corona discharge treatment was performed to obtain the dark shade by etching and to observe the effect of solvent pretreatment and consequential change of the degree of crystallization. Dimity Dramamine(DMF) treatment was carried out before etching. As the result of plasma or corona etching, the dark shade was obtained in dyeing. With increasing the solvent pretreating time, the ratio of weight loss and difference of lightness value(△L) were increased. As the denier of fiber decreased, the ratio of weight loss and AL were increased. The solvent pretreated PET was easily etched for its modified structure resulted from DMF treatment.