Full definition
Cover fabric refers to the woven textile material that envelops the entire outer cross-section of wrapped V-belts. Its primary function is to serve as a protective jacket against various forms of damage such as abrasion, oil, heat, and environmental factors. The typical materials used for cover fabrics include cotton, polyester, or a cotton-polyester blend. These materials are often bias-cut, meaning they have a diagonal weave that enhances flexibility and strength. The cover fabric is impregnated with a rubber compound that not only aids in adhesion but also contributes to the overall flexibility of the belt. This protective layer is crucial as it ensures the longevity of the V-belt while maintaining operational efficiency.
One key characteristic of cover fabric is its ability to create a barrier between the rubber body of the belt and the pulley groove. This barrier effect results in a friction coefficient that is 5-15% lower compared to raw-edge (uncovered) belts. While this reduced grip can be a disadvantage in terms of power capacity per belt, it can also help prevent slippage in certain applications where lower friction is desirable. For instance, in systems that require precise torque control, using a belt with cover fabric can mitigate excessive wear on the pulley and extend the lifespan of both components.
In specialized applications, particularly in explosive atmospheres, the need for antistatic properties becomes critical. To address this, conductive carbon fibers are woven into the fabric, ensuring that the surface resistivity remains below 10^6 ohms, as required by standards such as ATEX and IEC 60079-0. This characteristic is vital for maintaining safety in environments where static discharge could pose a significant risk. Overall, the choice of cover fabric can significantly influence the performance, durability, and safety of V-belts in various industrial applications.