#Research & Development

2025-01-23

Textile daylight management when the winter sun is at an angle

When the sun is currently shining, shading textiles face particular challenges. On the one hand, they should allow as much daylight as possible into the rooms during the dark season. On the other hand, the angle of incidence of the sun's rays is so low that the light is particularly dazzling - much more so than in summer. The German Institutes of Textile and Fiber Research (DITF) are using special light measurement techniques to research suitable shading textiles.

Daylight enhances well-being and has many advantages over artificial lighting. Sensible daylight management can therefore increase the ability to perform and concentrate. As less artificial light is required and solar gains and losses are used for room air conditioning, daylight management also saves energy.

Scheme for determination of the cut-off angle with 1 light source, 2 diffuser, 3 measurement sample on motorized rotating stage, 4 collimating lens, 5 spectrometer. Drawing: DITF

Textile daylight systems influence the incidence of light and are mainly designed to be movable. Internal systems include, for example, roller blinds, folding blinds and curtains. External systems are external venetian blinds, awnings and screens that are guided in front of the façade. The DITF can precisely measure daylight behavior in its light and dark laboratories - even beyond existing standardized test methods.

A test method developed in Denkendorf allows the glare control of solar protection devices to be re-evaluated and has been included in the standard to determine the cut-off angle. This cut-off angle describes the extent to which a solar protection device can block the transmission of direct light from a certain angle of incidence. In the currently valid standard, glare control is quantified using the two characteristics of normal and diffuse light transmittance. For solar protection devices with an openness coefficient of 1-3 %, a higher glare control class can be achieved. This applies to cut-off angles of 65° or less. The cut-off angle is determined by an angle-dependent measurement of the direct light transmittance. During the test, the solar protection textile is rotated in a modified test sample holder from the zero point until the direct light transmittance falls below a defined threshold value. This process is repeated after a gradual azimuthal rotation of the test sample, in other words a rotation of the textile in the test sample holder. Depending on the symmetry properties of the sample, up to 29 individual measurements may be required to determine the cut-off angle.

At the DITF, testing and development facilities for other photometric requirements such as incident light, self-luminous textiles and light-conducting textiles are available for industrial product developments.

The direct transmission of a textile screen when changing the angle of incidence and the specific angle of rotation. Photos: DITF

Towards a circular and sustainable textile industry in Europe: BioFibreLoop has been started

The German Institutes of Textile and Fiber Research Denkendorf (DITF) are coordinating the research project, which is funded as part of the European Union's Horizon Europe research and innovation program. The aim of BioFibreLoop is to develop recyclable outdoor and work clothing made from renewable bio-based materials. The kick-off event took place in Denkendorf on June 26 and 27, 2024.

Textile climate control system in workwear – exhibition at the 2026 SME Innovation Day!

Conventional protective workwear often reaches its limits during strenuous physical activity. In particular, the transport of sweat and excess body heat poses a problem. The German Institutes of Textile and Fiber Research (DITF) conducted research on flow-optimized, air-conducting textile structures that enable targeted climate control directly on the body. These structures can be integrated straight into protective work garments. The textile climate control system supports the body’s natural thermoregulation. This contributes to improved workplace safety and comfort.

Elastic yarns to become more recyclable and environmentally friendly in future

On 29 April 2026, ITA student Tobias Dickmeiß was awarded a sponsorship prize by the Wilhelm Lorch-Stiftung for his innovative approach, to replacing conventional elastane with elastic yarns made from thermoplastic copolyester elastomers (TPC). Thanks to their thermoplastic nature and compatibility with typical polyesters used in the textile industry, elastic TPC yarns offer improved recyclability. Furthermore, the use of the melt-spinning process in yarn production eliminates the need for solvents that are harmful to the environment and human health.

Walter Reiners Foundation Prize awarded to three ITA graduates

Sabina Dann, Lukas Balon and Annegret Storm from the Institut für Textiltechnik (ITA) of RWTH Aachen University were awarded the Walter Reiners Foundation Prize by the German Engineering Federation (VDMA) for their master’s and bachelor’s theses. Peter Dornier, Chairman of the Walter Reiners Foundation, presented the awards during Techtextil at the VDMA stand in Frankfurt am Main, Germany.

Young talents honoured – 60 years Walter Reiners Foundation

At the Techtextil trade fair in Frankfurt at the end of April, Peter D. Dornier, chairman of the VDMA’s Walter Reiners Foundation, presented awards to five successful young engineers. Promotion and sustainability awards were presented in the categories of bachelor’s/project theses and diploma/master’s theses. Academic theses are eligible for the sustainability awards if, for example, they develop solutions for resource-efficient products and technologies.

INDEX 2026: Reicofil introduces RF 5.10 upgrade boosting output by 10 percent

At INDEX 2026, Reifenhäuser Reicofil will present its latest developments for the nonwovens industry under the guiding themes “Grow Together”, “Expand Together” and “Transform Together”. On this occasion, the leading manufacturer of nonwoven machinery will be unveiling two brand-new technology advancements – RF 5.10 upgrade and RF Core – at the show.

Tradition and Innovation – Phoenox Textiles Ltd. relies on state-of-the-art carpet back-coating line from Brückner

For more than 70 years, Phoenox Textiles Ltd. has been synonymous with quality, reliability, and inno-vation in the textile industry. Founded in 1954 in Huddersfield (Yorkshire, UK), a region with a long tradition in textiles, this family-owned business has continued to evolve without losing sight of its roots. Today, in its fourth generation under the leadership of the Mosley family, Phoenox successfully combines decades of experience with a clear, forward-looking corporate strategy.

Uster FiberQ excels for recycled raw materials too

Uster FiberQ is a complete solution for raw material utilization, supporting spinners to achieve consistent quality and profitability every day, building further growth for the future. The Turkish company ORTA relies on FiberQ with recycled yarn for its denim production. Data-driven knowledge puts the producer in control of raw material utilization – ready to make the correct decisions for process efficiency, quality and productivity.