Warp-knitted textile structure

The produced warp knitted fabrics can be set up concerning elongation and porosity and show a higher extension than woven brics. In contrast to knitted fabrics, warp knitted textile structures are insensible to cuttings, which means if a me is ripped up, the failure does not continue in the textile structure (a so called ladder). Ibis property leads to high seam chunking resistance, udiicb is especially needed for medical applications. 

Warp-knitted textile structure showing a closed loop locknit stitch. 

The integration of sensors into warp-knitted textiles for geotechnical and masonry applications (two-dimensional and rope-like structures) ... 

The coating process has to deal with the special textile structure for FRC. In general non-crimped fabric structures with 0°- and 90° fiber directions are utilized. The fibers in warp- and weft direction are bonded with a knitting thread. The strength of the bond varies with the types, Tricot-and Chain-weave (... 

The fatigue behaviour is an important parameter to investigate for composites with a textile reinforcement structure. Warp knitted, braided and woven reinforcements will find increasing attention in future. 

The production of technical textiles is an expanding market. New production methods have also been developed for technical textiles rather than the classical production methods. It is now possible to produce a very wide spectrum of bric structures in warp knitting technology. 

Textiles have different properties, depending on their structure. For the following studies warp knitted structures were produced. 

Additionally to conventional scaffold production in one-step mediocis, textile structures can also be designed by combining different textiles (e.g. combination of warp-knitted and non-woven textile structures). The challenging part of the textile structuring is the setting of the machinery and the design of the textile structure. 

Figure 8.1 indicates that geotextile structures include continuous sheets of non-woven, woven, and warp knitted fabrics, and stitch-bonded fibres or yams. The woven and warp knitted materials can be made to have a similar structure to certain of the textile-related products (essentially geogrids) to be used as alternatives. The non-woven geotextiles can be combined with the textile-related structures to make geocomposite products that are multifunctional. 

To this end, the machine building and textile industries have together developed what is known as the Caliweb process in which a warp-knitted spacer nonwoven Multiknit is used instead of the layer of foam. The nonwoven is clearly three-dimensional and is available from 3 mm to 8 mm thick. Fibres are mainly orientated in the third dimension and are integrated into both the meshed surfaces of the nonwoven (Fig. 3.3). Above this, their position is fixed by means of thermosensitive bonding fibres. This structure is as good as the foam which has been replaced. Composite formation between the decorative material and the nonwoven... 

Needle-punched warp-knitted nonwoven material serves us as a further example of how important the quality of reclaimed fibres is. This material is used to substitute for the components of polyurethane foam in laminated composites. The purely textile composite resulting allows one to recycle both the production waste generated and the composite structure itself at the end of its life (see Chapter 3). To make sure a nonwoven containing 40% of reclaimed fibres can be well processed on a warp-knitting machine and shows full functionality when used as a laminated composite for a motor vehicle seat, the reclaimed fibre used needs to meet the following requirements ... 

D knitted textiles have already been widely used as technical textiles in different fields. The future work should be on the development of new 3D knitted structures with more extra functions to meet the requirements of new application fields. For example, warp-knitted spacer fabrics have great structural variations. By using different structures and fibre materials, they have been developed to have various physical functions to be used in different fields, such as cushioning, sound absorption, smart textiles and thermal collection. New potential application fields should be identified first in the future, and then fabric stmctures can be designed to better match the specific applicatimis. 

Knitted structures are made of loops of yam interconnected with each other. The size of the loop can be altered to produce a fabric as per required characteristics. Some knitted stmctures offer robusmess and are suitable for many technical applications. Knitted stmctures are mainly classed as weft knitted or warp knitted. Weft-knitted fabrics are highly stretchable and hence are extremely useful for undergarment and sportswear production. Warp-knitted fabrics do not unravel as easily as weft-knitted stmctures, and have significant insulating properties. In piezoelectric harvesting textiles, knitted stmctures offer extensibility, which is advantageous for wearable piezoelectric textiles, allowing wearer comfort. 

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