Abstract
Cuprammonium rayon fabrics were dyed with direct dyes by means of a microwave heating. The fabrics were dyed by the following two procedures: (A) The fabrics were dipped in an aqueous solution of the dye for 1 minute at 10°C or 10 second at 70°C. After being squeezed lightly (pick up 170%), the fabrics were heated by a microwave (500W) for 1 minute. If necessary this procedure was repeated 2-5 times. (B) The fabrics were printed with color pastes at 10°C. Without being dried, the printed fabrics were heated by the combination of microwave and steam.
The fastnesses of the dyeings dyed by (A), washing, rubbing and light fastnesses, were not enough. On the other hand, the fastnesses of the dyeings dyed by (B) were good enough and similar to those of the standard dyeings. The results of the dyeing fastnesses were explained in terms of the rate of vaporization of water in the fabrics and the rate of diffusion of the dyes in to the fiber during the heating process.
