#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.

Outdoor Industry Association completes Clean Heat CoLab initiative

The Outdoor Industry Association (OIA) has completed its multi-year Clean Heat CoLab initiative, bringing together outdoor brands and technology experts to accelerate the adoption of electrified process heating in textile manufacturing. The collaboration focused on reducing emissions from thermal processes such as dyeing, washing and finishing, which remain among the most carbon-intensive stages of textile production.

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.

Brazil sets new cotton export record and consolidates global leadership

Brazil ended the 2025/26 commercial year with a new record, consolidating its position as the world’s largest cotton exporter. Between August 2025 and July 2026, the country shipped 3,373,941 tonnes of the fiber, 19% more than in the previous cycle, and reached record revenue of US$5.3 billion. The result represents a milestone in Brazil’s expansion in the international market and reinforces the country’s role as a strategic supplier to the global textile industry.

The LYCRA Company expands its co-creation vision through an immersive Lifestyle District at Intertextile Shanghai.

The LYCRA Company, a global leader in fiber and technology solutions for the apparel industry, is reimagining the trade show experience at Intertextile Shanghai Apparel Fabrics Autumn Edition, which opened today in China. Building on the success of last year's ALL IN concept, the company has expanded its co-creation vision into a 356-square-meter Lifestyle District featuring partners Jingzili New Material, JYT Textile, Lianxingfa Knitting, and Trend Textile. The district is part of a larger 895-square-meter pavilion showcasing a total of 19 co-exhibitors. Together, they demonstrate how innovations in fiber, fabric, and garments can be combined to create compelling solutions for both work and play.

Plastic-free stretch technologies drive new direction for denim innovation

As the denim industry looks for ways to reduce its reliance on synthetic fibres, plastic-free stretch technologies are gaining momentum. Developments based on mechanical fabric construction and natural rubber are demonstrating that comfort and stretch can be achieved without conventional elastane, supporting both recyclability and circular product design.