Modeling the Effects of Color on the UV Protection Provided by Cotton Woven Fabrics Dyed with Azo Dyestuffs

Abstract

Color is one of the most influential variables on the protection against ultraviolet radiation provided by a fabric. The protection against UV radiation of a fabric is expressed quantitatively by means of its UPF (ultraviolet protection factor). The present paper shows the results of a study about the influence of the color on the UPF of cotton woven fabrics appropriate for summer articles. Through statistical models, the research seeks to relate the level of protection achieved in dyeing with three azo dyes to the factors governing the process, the shade, and the color intensity, as well as their interaction with the initial UPF of the fabrics. The obtained models will allow the programming and optimization of the value of the UPF of a fabric by means of adequate adjustment of the variables.

Influence of reactive dyes on ultraviolet protection of cotton knitted fabrics with different fabric constructions

“…This implies that even a small increase in dye concentration could lead to a remarkable improvement in UV protection for the fabrics with compact structures. The results agree with the study of Riva et al 6 in which UV protection of woven fabrics with more compact structures was improved by a small increment of color depth. Knit and miss (25%) and knit and miss (50%) fabrics dyed at 1% concentration obtain a similar UPF to knit and tuck and all knit dyed at 3% concentration in all four colors.…”

“…The UV protection provided by dyes is determined by the absorption position and intensity in the UV spectrum, which is primarily governed by chemical composition of dyes rather than the dye class. [1][2][3][4][5][6][7] Fabrics with the same hue may differ in ultraviolet radiation (UVR) absorbing property if the dyes used in coloration have distinct chemical composition. Besides, color depth was identified as a more important aspect that affects UV protection of fabrics more than the hue, and ultraviolet protection factor (UPF) of fabrics generally increases with dye concentrations.…”

“…Most of the studies focused on woven fabrics, [2][3][4]6,[8][9][10][11]13,15,18,19,[21][22][23][24] and a few of them examined the effect of coloration on UV protection of knitted fabrics. 9,10,20,25,26 The UV protective property of various dye classes were studied extensively, which included direct dyes, 4,10 reactive dyes, 3,4,7,19,20,22,24,[27][28][29][30] natural dyes, 8,11,13,23,26,[31][32][33][34][35] azo dyes, 6 disperse dyes and acid dyes. 2,4 However, there was no explicit conclusion on which dye class could provide the best UV protection.…”

Can ultraviolet light C decrease the environmental burden of antimicrobial‐resistant and ‐sensitive bacteria on textiles?

“…These factors should have allowed UVC to readily pass in‐between the fibres. However, microfibre was the darkest (light brown) fabric used in this study and likely had a greater absorption of UVC, thus allowing less UVC to be absorbed by bacterial DNA …”

Wowen Fabric and Ultraviolet Protection

“…The general conclusion of mentioned research was that UPF of cotton fabrics dyed with direct dyestuffs is influenced by the colour components (L*, a*, b*), fabric tightness and type of weave so we proposed a prediction model of UPF based on CIELAB colour components, weave factor, and warp/weft density. Riva et al (2009) analyzed the influence of the shade and colour intensity of the dyeing as well as their interaction with the initial UPF of the uncoloured cotton fabrics. They proposed UPF prediction model for cotton fabrics dyed with direct dyestuffs (yellow 98, blue 77, red 89) on the basis of the initial UPF of fabrics before dyeing, standard depth of colour, the corrected standard depth of colour and two categorical qualitative variables that define colour hue of dyestuffs.…”