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Effects of surface structure and substrate color on color differences in textile coatings containing effect pigments.
University of Borås, Swedish School of Textiles.
2014 (English)In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 84, no 2, p. 63-77Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Sage Publications Ltd. , 2014. Vol. 84, no 2, p. 63-77
Keywords [en]
Color-changing textiles, Special effect pigments, Coatings, Multi-angle spectrophotometric measurements, Surface structure, substrate color, Textile technology
National Category
Materials Engineering
Research subject
Textiles and Fashion (General)
Identifiers
URN: urn:nbn:se:hb:diva-1778DOI: 10.1177/0040517513485626ISI: 000329961700002Local ID: 2320/13241OAI: oai:DiVA.org:hb-1778DiVA, id: diva2:869847
Note

Sponsorship:

FoU nämnden, Högskolan i Borås

Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2018-04-04Bibliographically approved
In thesis
1. Functional Textile Coatings Containing Flake-shaped Fillers: investigations on selected optical and electrical properties
Open this publication in new window or tab >>Functional Textile Coatings Containing Flake-shaped Fillers: investigations on selected optical and electrical properties
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis investigates the manufacturing and characterisation of functionalised textile coatings containing different types of flake-shaped fillers with angle-dependent colour-changing and electrically conductive properties, respectively. Common benefits of these types of flakes are their high aspect ratio, which offers low filler loading with high functional performance. However, when applied on flexible fabric, their impact on the mechanical properties and durability leads to that a trade-off between, for example, flexural rigidity and functional performance need to be taken into account. Both experimental studies, with different functional approaches, explore how formulation additives e.g. rheology modifiers and cross-linker and knife coating parameters e.g. gap height and speed influence the formulation viscosity, which in turn strongly influences the amount of solids deposited on the fabric, and the functional performance.

Multilayered mica pigments can provide an angle-dependent colour change based on the phenomenon of interference, and has great potential in application within the textile design and product authentication fields. However, optimal conditions for intense colour-changing effects using these types of flake-shaped pigments depend on a plane-parallel orientation to a flat substrate. The pigment orientation is challenged by textile substrates, which have a textured surface due to the cross-sectional shape of the fibre, the yarn composition and fabric construction. In addition, the semi-transparent nature of these types of pigments means that the substrate colour highly influences the colour-changing effects.

Metal flake-shaped fillers for high electrical conductivity applications are particularly advantageous for reliable power and signal transferring interconnections in the field of electronic textiles. As the conductivity depends on the electron transport between the metal flakes, the challenge is to establish and maintain the three-dimensional network of contacting surfaces between flakes. Although the network is held together and adhered to the substrate by an insulating polymer film matrix, it is highly sensitive to dimensional impact upon different

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2018. p. 69
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 87
Keywords
Flakes, fillers, textile coating, properties, multilayered mica, effect pigment, angle-dependent colour change, metals, conductivity, resistance measurements, e-textiles, flexibility, durability
National Category
Engineering and Technology
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-13691 (URN)978-91-88269-90-4 (ISBN)978-91-88269-91-1 (ISBN)
Public defence
2018-04-27, Vestindien C, Textile Fashion Centre, Skaraborgsvägen 3, Borås, 10:00
Opponent
Available from: 2018-04-04 Created: 2018-02-19 Last updated: 2018-04-10Bibliographically approved

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Malm, Veronica

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