| Abstract: | The importance of control in the application of the water-soluble polymer, Hercosett 57, to prechlorin-ated wool tops and garments, is stressed with special reference to its effect on washability and subsequent dyeing operations. Reactive dyes play a vital role in achieving adequate colour fastness to meet machine-washable specifications and this paper pays special attention to problems of wet fastness encountered with full-depth dyeings produced with these dyes. In order to overcome these problems, both the dyeing operation and the after-treatment stage have been closely studied. A novel after-treatment is proposed as being more effective than the usual dilute ammonia method. Both high-temperature dyeing and low-temperature dyeing are discussed, the former method showing advantages in the case of full-depth dyeings and the latter in the case of pale-depth dyeings. |
