3D Fabric: Properties, Manufacturing and Uses

What is 3D Fabric?

All fabrics have a three-dimensional structure, but the fabric is usually so thin that it appears two-dimensional. However, in order for a fabric to be classified as 3D, it must have a distinct 3D look, which is often achieved via a geometric design. 3D fabrics are used often for composite fabrics and technical end uses, which are achieved by computer-aided design (CAD) and computer-aided manufacture CAM). 3D fabric is gaining attention for its strength, versatility, and unique applications.

Conventionally, two-dimensional (2D) plain woven or UD fabrics are considered to be the most favorable materials for manufacturing both soft armor panels and hard composite panels. Both exhibit considerably good mechanical properties and can be produced at low cost.

Nevertheless, there are certain drawbacks associated with them like poor layer-to-layer stress transfer, poor interlaminar shear strength, and poor structural integrity of the panel assembly upon ballistic impact, as well as the requirement of a large number of layers to be stitched together and subsequent creation of weak spots at stitching points, among others. As a solution to these problems, 3D orthogonal and interlock fabrics have come up as new promising materials for designing soft armor panels, attributed to their numerous advantages over 2D and UD fabrics. They exhibit higher strength, higher through the thickness, and interlaminar properties owing to their integrated structure, and do not require extra stitching processes. A 3D woven fabric is composed of three systems of mutually perpendicular yarns, against two systems in conventional 2D woven fabrics. The stuffer warp yarns and weft yarns are interconnected by binder warp yarns that move in the Z or vertical direction. Below Figure 1 gives a schematic representation of three types of 3D structures: orthogonal, angle interlock, and warp interlock, so as to have an insight into the kind of interlacement between different systems of yarns in a 3D weave.

Basic Properties of 3D Fabric:

3D fabrics have unique properties that make them useful in various industries. Some of the main properties include:

1. Thicker and stronger than usual fabrics, especially in the weft.
2. Tighter construction, which is often felt in the handle of the fabric.
3. Dense stitching will reduce strength and increase tightness.
4. Greater strength and bending stiffness on orthogonal structures.
5. Easily Shaped. They can be inserted into a mould and impregnated with resin to give the final shape, which means little handling and no machine stitching is required.

Types and Structures of 3D Fabric (Manufacturing Techniques and Classification):

The setting up of the machinery is timely but it will run automatically, albeit at a slow speed, using mainly jacquard looms due to the flexibility of the warp mechanism. They are produced in five different ways:

1. Stitch Operation: Fabrics are layered to a required depth, and a threaded needle is inserted into it to connect the layers. Often, aramid yarns are used because they are highly resistant to abrasive environments that these fabrics may be exposed to.
2. Multilayer Principle: A number of layered, woven fabrics are stitched during the weaving process. This production process is the most cost effective.
3. Orthogonal: Uses two series of warp yarns: ground and binder warps. Straight warp and weft yarns are bound together using the binder yarn. The former two yarns provide stiffness and strength, and the binder yarn running through the thickness of the fabric stabilizes the woven structure. These fabrics have high fracture toughness and impact damage resistance as compared to laminate composites.
4. Angle-Interlock: The weft yarns are straight and the warp yarns run diagonally through the fabric. This technique is used in many composite materials in which high inter-laminar strength is required.
5. Dual Direction Shedding: This method transpires on a grid formation with a multilayered, woven construction on both the vertical and the horizontal planes, which are interlaced.

The fabrics can be placed into four groups:

1. 3D Solid: They consist of multilayer, orthogonal, and angle-interlock fabrics. These can be net-shaped with integrated multiple walled sections in width and depth. These structures provide more layers that offer higher strength and bending stiffness.
2. 3D Hollow: These have tunnels running in a warp, weft or diagonal direction, which may be flat or uneven. These composites offer good, lightweight protection against low-velocity impact e.g. leg protection for riot police officers.
3. 3D Shell: These are created by weave combination, differential take up and moulding. These have single-walled sections in the fabric width and depth, but they lack tunnelling on the length and can be made into specific shapes. They are especially useful for crash helmets because the protection is just as good at every point on the helmet (unlike those made with ordinary fabrics where the shape is constructed through cut and sew techniques; there will be flaws to the protection on seaming).
4. 3D Nodal: This fabric is made by joining woven tubes that may be solid in structure or flattened to provide a 2D or segmented effect using different weave structures.

Uses of 3D Fabric:

3D fabrics provide superior strength and impact resistance, often free from delamination, with applications in aerospace, automotive, ballistic and marine uses. Used in car seats, floor mats, and interior panels for cushioning and insulation. In the medical field for artificial arteries, veins, joints, organs, orthopaedic tubes and scaffolds. It is also used for industrial pipelines, shin guards, headgear for skydiving, water sports and tennis rackets. Provides reinforcement in composite materials and insulation in buildings. Besides, 3D fabric creates stylish, textured clothing, and accessories with volume and comfort.

Conclusion

3D fabric represents a significant innovation in textiles, combining functionality with versatility. Their high strength, cushioning, breathability, and flexibility make them suitable for a wide range of industries, from fashion to aerospace. As technology advances, the use of 3D fabrics is expected to grow, offering creative solutions to both everyday and technical challenges.

References

[1] Ashford, B. (2016). Fibers to Fabrics.

[2] Ul-Islam, S., & Butola, B. S. (2018). Advanced textile engineering materials. Wiley-Scrivener.

[3] Gandhi, K. (2019). Woven textiles: Principles, Technologies and Applications. Woodhead Publishing.

[4] Liu, H. W., Yang, Y. X., Shen, S. J., Zhong, Z. L., Zheng, L. J., & Feng, P. (2012). Advances in textile engineering and materials. Trans Tech Publications Ltd.

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