Research

Powder mixtures and fixings, weaving technology production, electrical connection, and insulation

ZIM 16KN054922

Abstract
Within the Digi4TT project, TITV Greiz developed a groundbreaking powder coating process for textiles. By applying electroluminescent (EL) pigments dry onto interdigital fabrics, they created a cost-effective, large-scale, and flexible lighting technology that outperforms conventional screen printing in both efficiency and design versatility.

Problem
Traditional methods like screen printing are restricted by pigment size, require multiple complex processing steps, and often prove too costly or rigid for large-scale applications. Furthermore, conventional lighting elements frequently lack genuine textile haptic properties and durability against mechanical stress such as folding or torsion.

Solution
Instead of wet pastes, a dry powder mixture of EL pigments and binders is applied directly to a specialized interdigital fabric and thermally fixed.

• Efficiency: Fewer process steps and the ability to process larger pigments than screen printing
• Protection: Lamination ensures electrical insulation and shields the system from environmental factors
• Haptics: Covering the composite with outer fabrics preserves the essential textile feel and aesthetics

Figures 1 & 2: Flexible electroluminescent textiles

Results and Applications
A complete technology chain for widths up to 88 cm was established. Peak luminance is achieved with a powder height of 290 µm and a 75% pigment ratio. The resulting composites are highly resistant to dynamic stress.

• Applications: Ambient and control element lighting in transport and public buildings, general interior lighting (residential), and space-saving, self-illuminating advertising without the need for bulky backlighting.

The authors and partners gratefully acknowledge financial support from Federal Ministry for Economic Affairs and Energy to the research project DigiElTex (16KN054922).