Browsing by Author "Ylänen, Joanna"

New regenerated cellulosic fibers which have more ecofriendly materials and/or production processes have become more common in hand crafts. Dyeability and colorfastness also take part in defining the material choices both in clothing and interior textiles. The meaning of this study was to find out the differences in dyeability and colorfastness of regenerated cellulosic fibers dyed with reactive dyes. In the previous studies was found out for example that the color difference of the non-dyed viscose and lyocell was repeated even in the dyed specimens. In overall, the dyeability of these fibers was found out to be similar. The color of the non-dyed and dyed viscose, lyocell, bamboo viscose and acetate specimens was measured with the spectrophotometer. Dyeing result was evaluated regarding the color of the dyed specimens as well as the relationship between the color of the non-dyed and dyed specimens. The change in color of the specimens and the staining of the multifiber adjacent fabrics were also assessed after the laundering test. A mistake concerning the dyeing of the bamboo viscose and acetate specimens happened in the beginning of the study. Due to that these specimens were not included into the comparisons but the focus was in comparisons of viscose and lyocell. This study confirms the previous outcome of similar dyeability of viscose and lyocell. There were only few observed differences between viscose and lyocell which were mainly small. The biggest differences were observed in lightness and staining. The difference in lightness was mainly caused by the different structure of the specimen. The staining of wool and cotton was stronger than the other test fibers. However, there was not statistically significant difference between the specimens causing the staining. The influence of the color differences in the non-dyed specimens was not observed in the color of the dyed specimens. It would have needed analysis of statistical significance of the color changes but due to the small sample size this was not possible. The results of the study give positive picture of the dyeability and colorfastness of lyocell, being close to the level of dyeability and colorfastness of viscose. This could encourage the wider usage of lyocell in dyeing of yarns and fabrics.