#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.

Closing the Loop in the Textile Industry: Value Creation in the State of Brandenburg

How can the state of Brandenburg benefit from a circular textile industry? This question is addressed in the new policy paper "Closing the loop in the textile industry: Value creation in the state of Brandenburg." Based on the „TexPHB“ feasibility study funded by the Brandenburg Ministry of Climate Protection, it shows how textile waste can be integrated into new value chains.

Better, faster, bio-based: Functional new Plastic alternatives

How can new bio-based and biohybrid materials with improved features be developed faster? Six Fraunhofer institutes are jointly exploring this question in the SUBI²MA flagship project, using an innovative bio-based polyamide developed by Fraunhofer researchers as a model. Its specific properties make it a promising alternative to fossil-based plastics.

A smarter way to verified Chemical Compliance

Hohenstein and GoBlu Drive Innovation in Sustainable Supply Chain Management As regulatory demands, customer expectations, and sustainability goals continue to grow, the ability to manage chemical compliance and data across complex supply chains has become critical. Hohenstein and The BHive® by GoBlu are initiating a strategic partnership to enhance chemical management in the textile sector. The collaboration delivers more than just a service – it provides an integrated, future-ready solution for brands, manufacturers and suppliers seeking trusted chemical management and credible sustainability.

Nike unites innovation, design and product teams to accelerate athlete-centered innovation

Nike, Jordan Brand and Converse are joining forces under a new, athlete-focused creation structure aimed at accelerating innovation and driving growth across NIKE, Inc. The new setup unites the Innovation, Design and Product teams from all three brands into a single “creation engine” that will enable greater sharing of insights, technology and manufacturing methods throughout the innovation process. This integration is part of Nike’s new Sport Offense strategy and is designed to enhance the creation of products that help athletes perform at their best.

DORNIER celebrates its anniversary at ITMA Asia + CITME

To mark its 75th anniversary, machine and plant manufacturer Lindauer DORNIER will be presenting the latest developments in its rapier and air-jet weaving machines at ITMA Asia + CITME in Singapore (Hall 2, Stand B401) from 28 to 31 October 2025. The focus will be on energy-efficient weaving technologies, new IoT solutions for networked textile production and systems for the series production of modern fibre composite components.

BCI warns against ‘dangerous dilution’ of EU corporate directives

The approval of the European Commission’s Omnibus I proposal by the European Parliament’s Committee on Legal Affairs, accepting controversial changes to key sustainability directives is of great concern. These changes, namely to the Corporate Sustainability Reporting Directive (CSRD) and the Corporate Sustainability Due Diligence Directive (CSDDD), threaten to significantly dilute business reporting and due diligence obligations.

Pioneering open-source framework shows how early innovation drives a just and net-zero fashion future

The non-profit H&M Foundation, in collaboration with Accenture, has unveiled From Signals to Systems Change, an insight report calling on the fashion industry to rethink its role in transformation. At its core is the Reimagined System Map, a pioneering open-source framework that visualises how early-stage innovation could drive a just and net-zero textile future.