#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.

Europe is committed to recycling end-of-life wind turbine blades

Starting in 2026, Europe’s wind energy industry has committed itself to ensuring that wind turbine blades do not end up in landfills once they reach the end of their service life. The EU-funded research project REWIND is exploring ways to reuse this composite waste. The German Institutes of Textile and Fiber Research Denkendorf (DITF) are one of 13 project partners from seven countries.

ADD-ITC 2026 publishes preliminary conference program

The organizers of the Aachen-Dresden-Denkendorf International Textile Conference (ADD-ITC) 2026 have released the preliminary program for this year's event, which will take place on November 26–27, 2026, at the International Congress Center Dresden. The conference is expected to attract between 500 and 700 participants from industry, research, and academia.

Networking Day 2026: Industry stakeholders unite around textile recycling

In 2026, the Industry Research Group (IRG) Polymer Recycling once again brought together some of the key stakeholders in textile recycling for its annual Networking Day. This year, the event took place at EREMA’s premises in Ansfelden, Austria. It brought together key players from across the textile recycling value chain for a day of structured exchange and in-depth discussions.

Smart textiles reversibly change shape in an energy-efficient manner in response to ambient temperature

Self-actuating textile structures are used in a wide range of applications, such as medical technology, automation, architecture, agriculture, and the apparel industry. An example is the use of shading nets in greenhouses, which can be deployed and retracted depending on the sunlight intensity. The German Institutes of Textile and Fiber Research Denkendorf (DITF) are developing textiles based on shape-memory polymers with reversibly controllable geometry.

Naia™ from Eastman strengthens western hemisphere textile connections at Apparel Sourcing Show Guatemala

As brands and retailers explore more diversified and responsive sourcing networks, the Naia™ brand from Eastman is strengthening its engagement with the textile and apparel value chain across the western hemisphere. From August 18–20, the company will participate for the first time in Apparel Sourcing Show Guatemala, a regional meeting point for apparel sourcing, manufacturing and nearshoring.

Dornbirn GFC 2026 expands conference program with new thematic sessions

For 65 years, Dornbirn GFC has stood for innovation and is one of the world’s leading conferences in the fiber industry. From September 16 to 18, 2026, the international fiber community will meet in Dornbirn, Austria, to discuss current trends, technological developments, and forward-looking solutions. More than 600 experts from industry and academia from over 30 countries are expected to attend. With around 100 presentations by renowned speakers, a 2,5-day conference program, and three parallel presentation rooms with moderated sessions, Dornbirn GFC provides a first-class platform for knowledge exchange, networking, and international collaboration. Together, participants will generate ideas and impulses that will sustainably shape the future of the global fiber industry.

PERFORMANCE DAYS announces new focus topic & forums for October 2026

With its upcoming October 13–14, 2026 edition, PERFORMANCE DAYS is placing the spotlight on one of the textile industry’s most important transformations: “Bio-Based Materials – From Fiber to Fabric”, a two-part Focus Topic exploring the future of bio-based innovation across the textile value chain. Part 1, presented in October 2026, will focus on fibers and next-generation material developments, while Part 2 at the March 2027 edition will shift the perspective toward dyeing, finishing, additives, and processing technologies.