Effects of surface structure and substrate color on color differences in textile coatings containing effect pigments

Abstract

Textiles with dynamically color-changing effects depending on the observation angle were achieved by applying a coating paste containing multicolor effect pigments using a knife-over-table coating method. Black and white textile substrates with different structure characteristics depending on yarn type (multifilament and spun) and thread count (high and low) were studied and compared to a paper test chart as a smooth reference. The influence of surface structures on effect pigment coatings were investigated and compared with TiO2 coatings. Scanning electron micrographs showed that the substrate surface roughness increased when constructed of multifilament yarns with high thread count, spun yarns with higher thread counts and spun yarns with lower thread counts. Multi-angle spectrophotometer measurements of effect pigment-coated samples showed that the color differences in form of the CIE L* a* b*-coordinates varied to great extents, depending on detection angles, surface roughness and color of the substrates, compared to TiO2-pigment coatings with insignificant color-changing effects. The parallel alignment of effect pigment platelets was more easily achieved on the test chart. As a result, the color-changing effect was less intense on coated textiles. The effect were approximately reduced by half when coated on a substrate constructed of spun yarns compared to one made of multifilament yarns.

Effect of Concentration of Thermochromic Ink on Performance of Waterborne Finish Films for the Surface of Cunninghamia Lanceolata

“…The "H" means hue. The colour difference (∆E) was calculated according to Formula (1): [18] ∆E=[(∆L*) 2 +(∆a*) 2 +(∆b*) 2 ] 1/2 (1) where ∆L* (lightness difference) = L 1 * − L 2 *, ∆a* (red and green difference) = a 1 * − a 2 *, ∆b* (yellow blue difference) = b 1 * − b 2 *. Figures 1 and 2 show the chroma value image of L* and a* of the finish film with different concentration of thermochromic ink from 18 to 40 • C. The a* value changed obviously with the temperature, which showed that the red green colour of the finish film changed significantly.…”

The Properties of an Aluminum/UV-Curable, Infrared, Low-Emissivity Coating Modified by Nano-Silica Slurry

“…∆L = L' − L, ∆a* = a*' − a*, ∆b* = b*' − b*. The color difference ∆E is calculated according to Equation (1) [27]:…”

Study on Some Thermal and Electrical Properties of Basalt Fabric Modified with Metal and Ceramics as a Result of Magnetron Sputtering

“…A non-contact digital color imaging system DigiEye (VeriVide, Leicester, UK) was used to carry out the surface analysis of samples. DigiEye provides colorimetric measurements from samples with an ultra-small area, featuring irregular or curved surfaces [19][20][21]. The CIE Standard [28] defined procedures for calculating the coordinates of the CIELAB color space.…”

“…Instrumental color measurement was used as the method providing an objective data with a sufficient accuracy and repeatability for the color assessment of basalt fabric and basalt fabric modified with the chosen coatings. It is useful in the case of measurements of surface textures [18], especially the textile material surface [19][20][21]. Using the non-contact digital color imaging system DigiEye, an original method of samples surface analysis was elaborated and presented.…”