Braided fabrics

Figure 2.6 Schematic of a braided fabric structure in relaxed and stressed conditions.

In a multifilament yam or in a braided fabric, normal (i.e. in the radial direction) frictional force holds the fibers together. Such an interfiber friction is desirable if we wish to have strong yams and fabrics. However, there eire situations where we would like to have a smooth fiber surface. For example, in a yam passing round a guide, a smooth fiber surface is desirable. If the fiber surface is... 

In contrast to 2D woven and braided fabrics, yams of various layers in 3D fabrics are stacked regularly. Hence, nesting in 3D weaves appears to be less pronounced except for the cases of unbalanced fabric patterns [24]. 

Potluii P, Nawaz S. Developments in braided fabrics. In Gong RH, editor. Specialist yam and fabric stmctures developments and applications. Elsevier, Woodhead Publishing Limited, Cambridge 2011. p. 333-354. 

Naik RA. Failure analysis of woven and braided fabric reinforced composites. J Compos Mater 1995 29 2334-63. 

Braided fabric n. A narrow fabric made by crossing a number of strands diagonally so that each strand passed alternatively over or under one or more of the other strands. They are frequently used in shoelaces and suspenders. 

Woven, knitted and braided fabrics for medical textile products are made from yarns that contain fibers, whereas nonwoven fabrics can be made directly from fibers or even polymers. Expanded PTFE fabrics and electrospun webs of micro and nano denier fibers, used in medicine, are examples of products made directly from polymers. All fabrics mentioned vary widely in their construction parameters and, therefore, in the performance characteristics obtained from a given raw material. There is, therefore, a hierarchy of structure. The performance of a final product can be modified from two to four levels of organization. 

To the best of this author s knowledge, 3DDfW preforms have been only produced in small demonstration samples on some manually operated devices. This author is not aware of any industrial-scale automated machines for their production. By the nature of this particular 3D weaving process, the fabric cross-sectional dimensions will be always relatively small (similar to the well-known situation with 3D braided fabrics), and the weaving speed will be always much slower than in the production of... 

Figure 16.10 Method to create a flat braided fabric from a braided tubule.

Nonwovens are structures of textile materials, such as fibres, continuous filaments, or chopped yarns of any nature or origin, that have been formed into webs by any means, and bonded together by any means, excluding the interlacing of yams as in woven fabric, knitted fabric, laces, braided fabric or tufted fabric. 

Figure 10.18 Application of microbraided yarn to textile, (a) Woven fabric, (b) flat braided fabric, (c) plain knitted fabric, and (d) multiaxial warp knitted fabric.

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