Belt Construction: Cotton fabric ply constructed rubber covered belting is the mostly
used belt for flat and troughed conveyor. The carcass consists of one or more plies of
woven fabric or of solid woven fabric impregnated with a rubber or plastic mix, which after vulcanization binds the plies together. The fabric used is made of threads of cotton or polyamide or any other synthetic material or combination thereof, evenly and firmly woven. The carcass is covered by special wear and impact resisting rubber compounds / plastics. For the protection of the carcass, layer or layers of open-mesh or cord fabric, termed as ‘‘breaker’’ may be placed between the cover and the carcass, or may be embedded in the cover. Number of fabric plies varies from 3 for shorter belt widths (300mm and above) to a maximum of 12 to 14 plies for belt width of 2000mm. Number of plies can vary within a range for a specific belt width. Steel cord belting is used when good trough ability, high operating tensile strength and small elongation are desired.
Fig 6.1.6 shows a typical belt cross section.