Full definition
Textile reinforcement involves the incorporation of woven or knitted fabric layers within an elastomer matrix, significantly enhancing the mechanical properties of rubber products. This technique increases tensile strength, reduces elongation, improves dimensional stability, and enhances resistance to tears and punctures. Commonly used reinforcement fabrics include nylon (PA6, PA66), known for their high strength and flexibility; polyester (PET), which offers low elongation and good dimensional stability; aramid/Kevlar, recognized for its exceptional strength-to-weight ratio and minimal elongation; and cotton, which provides good adhesion to rubber but is less frequently used in modern applications. Fiberglass is also utilized in timing belt cords due to its rigidity and strength.
The fabric construction plays a critical role in the performance of the reinforced elastomer. Plain weave offers balanced properties suitable for general applications, while twill construction provides better drape and flexibility, ideal for complex shapes. Bias-cut fabrics, oriented at a 45° angle, enhance conformability, making them suitable for applications requiring flexibility and adaptability to surface contours. Reinforcement layers can be single-ply or multi-ply; for instance, a 2-ply reinforcement in neoprene and rubber sheets can transform a stretchable material into a dimensionally stable diaphragm or gasket, achieving tensile strengths that are 2-5 times higher than non-reinforced alternatives.
In the production of conveyor belts, the fabric plies, such as EP (polyester-nylon), form the carcass that bears the entire tension of the belt during operation. The adhesion between the textile reinforcement and the rubber matrix is crucial for performance and durability, typically achieved through a RFL (resorcinol-formaldehyde-latex) dip treatment, which enhances the bonding between the fabric and the elastomer. According to ISO 14890, specifications for conveyor belt reinforcement detail the requirements for various fabric types, ensuring optimal performance in industrial applications.