Dyes, analysis NIRA 697 NIRS

NIRS has been used for qualitative identification of textile fibres, polymer microstructure and composition studies, determination of finishes on textile fibres and colour deviations in dye batches. As shown in Table 1.18, near-infrared reflectance analysis (NIRA) is useful for characterising textile raw materials, fibres, yarns, and fabrics and is an excellent means to obtain real-time process/product information in textile manufacturing [312]. The nondestructive quantitative analysis is simple to use and... 

The statistical analysis method of discriminant analysis [342] has been combined with NIRA to identify dissimilar textile products. Most textile fibres, yarns, and fabrics have chemical structures which yield complex NIR spectra, and as such these species normally require three or more wavelengths to classify the material. Discriminant analysis is simple to use, rapid, and does not require extensive, time-consuming sample preparation and analysis. Polyester staple fibres of different tenacity levels have different fabric dyeing properties. NIRA method with discriminant analysis successfully identifies and classifies the polyester staple samples by tenacity level and thus provides a quick technique for identification of polyester fibre anticipating quality problems [315]. Mitchell et al [343]... 

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. 

NIR spectroscopy has become an analytical tool frequently called upon in many production processes. Its use in polymer processing applications such as polymer extrusion [83] increases greatly product quality. The applications of non-destructive NIR methods to synthetic polymer studies have been reviewed [131-133]. Typical reported applications include process and pilot monitoring [134], realtime analysis of thermoplastic melt processes [129, 135], insoluble cross-linked systems [136], polymer flakes, fluffs and film. NIRA has controlled production in dyeing of textured PA6 carpet yarns with... 

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See also in sourсe #XX -- [ ]

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