#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.

The region of renewable raw materials: Central German Alliance for Bioplastics

The development of sustainable plastic solutions is rapidly gaining importance in light of global environ- mental pollution, dwindling fossil resources and ambitious climate protection targets. As part of the re- gional alliance RUBIO, which brings together 18 partners from central Germany and the Berlin-Branden- burg area, the bio-based and biodegradable plastic polybutylene succinate (PBS) was comprehensively investigated, starting with the raw material, through the manufacturing process, to industrial application.

Cooperation in the field of meltblown laboratory technology

The Nonwoven Institute (NWI) at North Carolina State University and Oerlikon Nonwoven will be collaborating in the field of meltblown laboratory technology in the future. This was announced by Professor Raoul Farer, Executive Deputy Director of the NWI and Professor at the Wilson College of Textiles at North Carolina State University, and Dr. Ingo Mählmann, Sales Director Nonwoven at Oerlikon Neumag, during this year's ITMA Asia and CITME in Singapore.

European research project addresses textile waste through integrated recycling technologies

A major European research initiative coordinated by Fraunhofer UMSICHT has been launched to develop integrated solutions for textile waste recycling. The AUTOLOOP project aims to create a comprehensive system that could process 1.24 million tonnes of textile waste annually by 2050, whilst potentially creating over 130,000 green jobs across the EU. This project aims to develop, test and integrate automated sorting, tracing, and closed-loop recycling technologies for polyester-based textiles (NRT), addressing the pressing challenge of textile waste management.

Feasibility study shows potential to convert textile waste into PHB bioplastic

Textile waste could serve as a valuable source of raw materials for sustainable plastics in the future, according to the joint TexPHB feasibility study conducted by the Fraunhofer Institute for Applied Polymer Research IAP, Beneficial Design Institute GmbH and matterr GmbH. The study will be presented to the public for the first time at a network meeting on 25 November 2025 at the State Chancellery in Potsdam.

Navis TubeTex announces U.S. partnership with Icomatex

Navis TubeTex, a global leader in advanced dyeing and finishing machinery solutions, is pleased to announce a new partnership with Icomatex (www.icomatex.com), a respected European manufacturer of high-quality stenters and textile finishing equipment. Under this agreement, Navis TubeTex will exclusively represent the Icomatex stenter line in the United States.

ADVANSA launches ADVA®tex: A new step toward textile-to-textile recycling

ADVANSA has introduced ADVA®tex, a new filling fibre made entirely from recycled pre-consumer textile waste, positioning the material as a significant step forward in textile-to-textile (T2T) recycling. The fibre is designed for use in duvets, pillows, mattresses, and furniture applications and is available in three versions.

KARL MAYER celebrates 35 years of EL pattern drive

KARL MAYER is celebrating an anniversary this year: on 30 November 1990, the first warp knitting machine with electronic guide bar control, the KS 4 EL, was delivered – another milestone for patterning. As early as 1980, the SU gearbox with the MRS42SU had initiated the transition from mechanical chains to digital data.