From the Sector

The German Institutes of Textile and Fiber Research Denkendorf (DITF) have modernized and expanded their melt spinning pilot plant with support from the State of Baden-Württemberg. The new facility enables research into new spinning processes, fiber functionalization and sustainable fibers made from biodegradable and bio-based polymers.

In the field of melt spinning, the DITF are working on several pioneering research areas, for example the development of various fibers for medical implants or fibers made from polylactide, a sustainable bio-based polyester. Other focal points include the development of flame-retardant polyamides and their processing into fibers for carpet and automotive applications as well as the development of carbon fibers from melt-spun precursors. The development of a bio-based alternative to petroleum-based polyethylene terephthalate (PET) fibers into polyethylene furanoate (PEF) fibers is also new. Bicomponent spinning technology, in which the fibers can be produced from two different components, plays a particularly important role, too.

Since polyamide (PA) and many other polymers were developed more than 85 years ago, various melt-spun fibers have revolutionized the textile world. In the field of technical textiles, they can have on a variety of functions: depending on their exact composition, they can for example be electrically conductive or luminescent. They can also show antimicrobial properties and be flame-retardant. They are suitable for lightweight construction, for medical applications or for insulating buildings.

In order to protect the environment and resources, the use of bio-based fibers will be increased in the future with a special focus on easy-to-recycle fibers. To this end, the DITF are conducting research into sustainable polyamides, polyesters and polyolefins as well as many other polymers. Many 'classic', that is, petroleum-based polymers cannot or only insufficiently be broken down into their components or recycled directly after use. An important goal of new research work is therefore to further establish systematic recycling methods to produce fibers of the highest possible quality.

For these forward-looking tasks, a bicomponent spinning plant from Oerlikon Neumag was set up and commissioned on an industrial scale at the DITF in January. The BCF process (bulk continuous filaments) allows special bundling, bulking and processing of the (multifilament) fibers. This process enables the large-scale synthesis of carpet yarns as well as staple fiber production, a unique feature in a public research institute. The system is supplemented by a so-called spinline rheometer. This allows a range of measurement-specific chemical and physical data to be recorded online and inline, which will contribute to a better understanding of fiber formation. In addition, a new compounder will be used for the development of functionalized polymers and for the energy-saving thermomechanical recycling of textile waste.

Trützschler Man-Made Fibers introduces OPTIMA for IDY and expands the range of the OPTIMA extrusion systems by the industrial yarn (IDY) sector. In addition to OPTIMA for carpet yarns (MO40-C, MO40-E and TO40), variants for manufacturing (semi-)industrial multifilament yarns are now joining the line.

Since 2012, Trützschler has been developing and building high-performance extrusion lines for carpet yarns (BCF - Bulk Continuous Filament) and industrial/technical yarns made of polyester, polyamide and polypropylene. The market launch of the OPTIMA concept for BCF took place in 2019 and has established itself in the markets since then. OPTIMA was designed as a modular platform and now also includes solutions in the IDY (InDustrial Yarn) sector.

OPTIMA systems for industrial yarn (TEC-O40 and TEC-O80) impress with flexibility application and end product diversity. Both concepts offer a wide range of design options and can be tailored precisely to meet end product and the throughput requirements.

OPTIMA enables the production of high-tenacity yarns for shoelaces, ropes and nets as well as low-shrinkage qualities for tire cords, truck tarpaulins and airbags. As the lines are modular, they can be quickly adapted to new market developments and end products.