#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.

STFI showcases new Textile LAB Professional with focus on climate protection and sustainable technologies

The Sächsisches Textilforschungsinstitut e. V. (STFI) in Chemnitz is organising a themed day on 3 December 2026, focusing on climate protection and the environment. As well as showcasing current applications for green cities and natural fibres for lightweight construction, the event will feature machine demonstrations in the new Textile LAB Professional. Under the motto ‘Design meets Technology’, this networking event will also provide an insight into artistic student projects, thereby facilitating a professional exchange on creative perspectives and modern technologies for climate protection and the environment.

Aachen Summer School: Textiles become smart through 3D printing and origami

From 21 to 29 September 2026, the Aachen Summer School will transform Institut für Textiltechnik (ITA) of RWTH Aachen University into a laboratory of the future: over the course of a week, students will use origami folding techniques and 3D printing to develop active textile structures capable of performing programmable movements. This interdisciplinary event combines theoretical foundations with practical prototyping – from digital modelling right through to functional textile prototypes.

25 years of medical devices: ITVP combines experience with innovation

ITV Denkendorf Produktservice GmbH (ITVP) is celebrating its 25th anniversary. On October 1, 2001, ITVP was founded as a subsidiary of the German Institutes of Textile and Fiber Research Denkendorf (DITF), Europe’s largest textile research center. This spin-off company made it possible to consolidate expertise in medical technology and significantly expand production, which had previously been initiated mostly in the DITF’s cleanrooms.

Mahlo introduces AI-supported Orthopac RVMC-20 plus at ITMA Asia 2026

From November 20 to 24, 2026, Mahlo GmbH + Co. KG will present its system portfolio for the textile industry at ITMA Asia in Shanghai. Together with its local sales and service partner Kuantex and Mahlo China, the Bavarian technology specialist will demonstrate at Booth C22 in Hall 7.1 how intelligent measurement and control technology can improve the quality and efficiency of textile production processes. The spotlight will be on the new Orthopac RVMC-20 plus, which combines precise weft straightening with fully integrated process control.