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January 22, 2019<\/span><\/strong> TW Special Report<\/span><\/strong><\/p>\n Along with a number of partners, HOFZET\u00ae \u2014 the Application Center for Wood Fiber Research of the Fraunhofer Institute for Wood Research based in Hannover \u2014 has developed new forms of bio-hybrid fibre reinforced composites (bio-HFCs) containing the highest possible bio-based content.<\/span><\/p>\n \u201cBio-HFCs are already successfully employed in a range of sporting goods, such as racing cycle frames, tennis rackets and skis, where they have a number of advantageous properties,\u201d explained technical textiles specialist Jana Winkelmann. \u201cIn particular, they have a low density, high vibration damping and flexible mechanical characteristics, in addition to the added benefit of containing substantial renewable raw material content.<\/span><\/p>\n The special double-rapier weaving loom and Vandewiele Jacquard attachment at the Open Hybrid Lightweight Campus (OHLF) in Wolfsburg, Germany.<\/span><\/strong><\/p>\n \u201cWe are developing new and practical combinations of natural and high-performance fibers, such as flax, hemp and viscose with carbon, glass or polyamide in multi-layer fabrics. These have application-oriented properties with the potential to be scaled up for mass production, and are targeted at applications in both the automotive and construction sectors.\u201d<\/span><\/p>\n One Of A Kind<\/span><\/strong> The OHLF weaving technology is enabling the Fraunhofer experts to cost-effectively produce materials with complex, application-specific textile structures and integrated functions, in widths of up to 50 centimeters.<\/span><\/p>\n \u201cWe are producing load path-appropriate combinations of the different reinforcing fibres and additional matrix fibers to produce hybrid textiles which will provide simpler handling and faster processing, as well as flexibility in achieving the desired mechanical properties in the finished product,\u201d said Winkelmann.<\/span><\/p>\n Samples of the HOFZET\u00ae multi-layer fabrics constructed from new combinations of natural and high-performance fibers.<\/span> A robot-controlled fiber-spraying unit further expands possibilities, allowing continuous filaments and yarns to be cut to a specific length and simultaneously wetted in an air stream with a mixture of resin and curing agent and sprayed onto a shaping tool.<\/span><\/p>\n Construction<\/span><\/strong> Textile-reinforced concrete has already proved to be durable, formable in diverse shapes and suitable for lightweight construction and so far has been based on carbon or glass fibers to replace the steel which is conventionally employed.<\/span><\/p>\n The flax-based textile is embedded in the given component in layers. Its stiffness is variable, so it can be arranged in a desired shape and could conceivably be cast to create curved contours such as domes and rounded wall elements.<\/span><\/p>\n Samples of the HOFZET\u00ae multi-layer fabrics constructed from new combinations of natural and high-performance fibers.<\/span><\/strong><\/p>\n \u201cThe quality of reinforced concrete made with a flax fabric is higher than that of the reinforced concrete in bridges,\u201d says Jan Binde, a scientist at ZELUBA\u00ae, a second department of the Fraunhofer Institute for Wood Research based in Braunschweig. \u201cThe matrix \u2014 that is, the structure \u2014 is so dense that harmful substances cannot penetrate the component. This results in a far longer service life of several decades.\u201d<\/span><\/p>\n \u201cThe natural fibers mesh very well with the building material and we can control how the textile is fixed in the concrete. The textile\u2019s specific surface is variable. A reinforced concrete bridge with a span of 15 meters would be about 35 to 40 centimeters thick, while its flax counterpart would be considerably slimmer at 12 to 16 centimeters. This saves a lot of material.\u201d<\/span><\/p>\n
\nThe special double-rapier weaving loom and Vandewiele Jacquard attachment at the Open Hybrid Lightweight Campus (OHLF) in Wolfsburg, Germany.<\/span>
\nThe special double-rapier weaving loom and Vandewiele Jacquard attachment at the Open Hybrid Lightweight Campus (OHLF) in Wolfsburg, Germany.<\/span>
\nUnique Vandewiele jacquard technology is proving central to research exploring the potential of hybrid woven technical textiles for a leading German research institution.<\/span><\/p>\n![](\"https:\/\/wordpress.textileworld.com\/wp-content\/uploads\/2019\/01\/VDWHofzet1.jpg\")
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\nThe development work is being carried out on a special double-rapier weaving loom and Vandewiele Jacquard attachment \u2014 the only one of its kind in Europe \u2014 at the Open Hybrid Lightweight Campus (OHLF) in Wolfsburg, not far from Volkswagen AG\u2019s parent plant. It serves as a competence and research centre for cost-efficient lightweight engineering and innovative materials and manufacturing technologies developed by Volkswagen and its industrial and institutional partners.<\/span><\/p>\n
\nSamples of the HOFZET\u00ae multi-layer fabrics constructed from new combinations of natural and high-performance fibers.<\/span>
\nAt present, a key HOFZET research focus is on composite reinforcements with a thermoplastic matrix, or organosheets, which offer reversible deformation and recycling potential in comparison with thermoset composite materials. The weaving loom enables the integration of thermoplastic matrix fibers into hybrid textiles as perfect thermoplastic prepregs. These prepregs can be shaped to a required form and turned into composites using hot pressing technology. This approach enables a reduction of process steps, cycle times and production waste. Furthermore, the process allows new design freedom, which enlarges the component spectrum of fiber-reinforced composites. The shaping, for example, can be carried out simply and quickly through thermoforming in a die or in the clamping unit of an injection molding machine.<\/span><\/p>\n
\nIn another project, flax-based multi-layer fabrics produced on the special HOFZET weaving system are being employed to reinforce concrete.<\/span><\/p>\n![](\"https:\/\/wordpress.textileworld.com\/wp-content\/uploads\/2019\/01\/VDWHofzetB.jpg\")
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