Dyeability, analysis

The modified cotton showed excellent dye exhaustion for all the dyes in the absence of salt. The treatment was foimd to improve the dye fixation also. The modification was also assessed through elemental analysis. This study may be further extended to viscose material after suitably modifying the treatment conditions. In another trial, 3-chloro-2-hydroxypropyltrimethylammonium chloride was used as a cationic agent to cationize cotton fabric by a pad-batch process. The cationized cotton samples were dyed with different reactive dyes containing various reactive groups. The dyeability of the cationized cotton samples with reactive dyes without salt was significantly improved due to an increase in the ionic attraction between the dye and cationized cotton. The... 

NIRA was used for the analysis of the dyeabil-ity of textured PA6 carpet yarns (one quality type) with C.I. Blue 127 1 and luminosity measurements of partially oriented polyester-yarns [316]. NIR diffuse reflectance spectroscopy has been used to investigate dye uptake potential of PET fibres [326]. NIRS has been used for evaluating colour deviations in different production batches of the acid dye Tec-tilon Red 2B [327]. If an adequate number of samples are available to generate robust regression models, then NIRS can be used as a QC tool to evaluate the dye using only drying and grinding for NIRS sample preparation. 

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