Pubdate：05-04-2022 Views：1231
As a general rule, current fabrics in use are designated by the working tension or strength of the fabric, shown in pounds per inch of width (PIW), i.e. 80, 110, 125,150, 200, 250, 300 and 500 pound fabrics, etc.
When dealing with carcass fabrics, we work with two separate strength measurements. The first is the Maximum Working Tension or strength of the belt. This is the highest tension occurring in any portion of the belt on the conveyor system under normal operating conditions. This is the strength measurement used to determine the proper belt for the system. The second measurement is the Ultimate Tensile Strength of the belt. The ultimate tensile strength of a belt is the point at which the belt will rupture and fail due to excessive tension.
The difference between the maximum working tension and the ultimate tensile strength of the belt is often referred to as the service factor. On top quality domestic conveyor belting, this service factor is 8-10 to 1. SKE belting adheres to these service factors. This means that if the maximum working tension is 200 PIW, the ultimate tensile strength would be 2,000 PIW. Belting utilizing nylon constructions generally has a service factor of more than 10 to 1. This higher service factor is necessary to overcome some of the inherent properties of nylon, such as excessive elongation.
Most conveyor belt fabrics are produced today with polyester warps (lengthwise yarns) and nylon fills (crosswise yarns). This combines the best properties of both textiles, offering high strength/ low stretch conveyor belt with excellent impact resistance, troughability, load support, and fastener and/or bolt-holding ability.
