From the Sector

From April 25^th to 27^th, 2023, the Institute of Textile Machinery and High Performance Material Technology (ITM) of TU Dresden will be exhibiting at the pavilion SAXONY! at JEC World 2023.

The ITM will provide a comprehensive overview of its current research in the field of machine and product development along the entire textile process chain.

The upcoming JEC 2023 exhibition will highlight innovative Customised Connective Cores (CCC), which are custom-made core-insert structures additively manufactured using cellular metal and a form-fit integrated insert. These CCCs can be seamless integrated either as patches or as full-surface core material into lightweight panels, offering significantly improved load-bearing behavior (especially 4 times the load-bearing capacity and fail-safe behavior) compared to existing technologies. This breakthrough opens up new possibilities for fastening lightweight panels.

Another highlight at the exhibition is the repair process for fibre-reinforced composites (FRP) developed at the ITM. Instead of mechanically grinding the damaged area, the matrix in the repair area is locally dissolved using a UV-rays-induced depolymerisation process. Damaged fibres can thus be replaced by a customized repair patch. Free yarn ends on the textile repair patches are spliced with the UV-exposed yarn ends in the repair area using an adapted splicing process. In this way, a very clean, simplified and mechanically improved repair area can be achieved compared to the state of the art.

The diverse possibilities offered by the structure and process simulation of textile high-performance materials and textile manufacturing processes will also be presented. By means of multi-scale modelling and simulation, a profound understanding of materials and processes is achieved at the ITM. Finite element models on the micro, meso and macro scale have been developed and validated for this purpose. Examples from current ITM research projects demonstrate the various possibilities and areas of application of modern simulation methods in the field of textile technology.

Moreover, an innovative process for the integral manufacturing of 3D rib-stiffened preforms with complexly arranged stiffeners in 0°, 90° and ± 45° orientation was developed and successfully implemented at the ITM. Due to the process-integrated structure fixation and the continuous fibre reinforcement between shell and rib structure, the 3D preforms are perfectly suited for the production of highly load-bearing FRP components with increased bending stiffness, which will be exhibited at JEC. Hence, the lightweight construction potential of high-performance fibres can be fully exploited.

A successfully established development are partially flowable 2D textile reinforcement fabrics that are continuously manufactured in one single process step. For this purpose, the entire process chain was developed at the ITM, which allows a cost-effective and high-volume production of load-bearing thermoplastic 3D FRP components with continuous fibre reinforcement between shell and stiffeners.

At JEC 2023, the ITM will also present a partially embedded textile latice girder as reinforcement for carbon concrete applications, which was produced by means of an innovative textile manufacturing process based on the multiaxial warp knitting technology. Through the development of a customized warp insertion, manipulation and take-off system as well as appropriate shaping methods, it is now possible to produce tailored textile semi-finished products, e.g. for use in wall and ceiling panels. These textile latice girders represent a resource-saving alternative to conventional steel girders due to the reduced among of concrete required and the additional cavity for media and cable guidance.

The integration of textile actuators and sensors in FRP provides structures with additional functionalities. The research and application of such interactive FRP with different matrix materials (e.g. with thermoset, elastomer or concrete matrix systems) for structural health monitoring or adaptive systems is one of the key research areas of the ITM.

Moreover, the development and implementation of innovative yarn constructions based on recycled high-performance fibres (e.g. rCF, rGF, rAR) for sustainable FRPs is successfully promoted at ITM. By use of a special carding machine, recycled fibres are opened up, separated and joined to form a wide, uniform ribbon. Subsequently, innovative hybrid yarn constructions made of evenly mixed recycled high-performance and thermoplastic fibres with variable fibre volume fractions can be manufactured by means of various spinning technologies. Selected yarn constructions and components will be showcased at JEC.

Wülfing GmbH is one of the oldest but also one of the most modern home textiles companies in Germany, with its main weaving and finishing operations located in Borken, North Rhine-Westphalia, and a further jacquard weaving mill in Steinfurt, as well as with a making up and packaging plant in the Czech Republic.

At its Borken plant, Wülfing has employed a Monforts sanforizing line since 2009 to guarantee the required dimensional stability and shrink-fastness of its high quality bed linen. With a working width of over three metres, the sanforizing process is a central pillar in the production of typical wide-width cotton fabrics for home textiles.

In 2017, the company was able to acquire a second Monforts sanforizing line from another company which, although built in 2005, had been virtually unused. It was overhauled and installed behind a Monforts equalizing frame of a similar age.

“Unfortunately, the two machines had to be operated separately via individual controls and did not represent an integrated unit,” says Schulte-Mesum. “This resulted in deficits in the desired productivity and in the control technology.”

Wülfing consulted with Monforts on a number of upgrade options and opted for a completely new joint control system to merge the two machines, as well as a new connecting inlet, a tensioning and damping field and a steaming unit.

“Monforts provided a fast and precise erection and commissioning of the technology in spite of the difficult pandemic circumstances,” says Schulte-Mesum. “The result has been an increase in production speeds by 20% and enhanced uniformity in fabric width through a much improved guidance system.

“We are also achieving energy savings as a result of the new control and drive technology and operation has been simplified and improved as a result of the unified control. We benefit from simplified access for maintenance work such as the grinding of the rubber blanket, but most of all we have greatly improved our flexibility and now have two almost identical Monforts sanforizing lines.”