TEXTILE BELTING This is made by weaving in a loom or building up a belt with layers of canvas stitched together. The success of this type of belting depends upon the weight and grade of cotton duck or other material employed, the method of stitching the duck plies together and the character of the impregnating compounds. In the better grades, the weight of the duck is usually 36 to 371 oz. to a stand ard 36 in. by 42 in. strip and possesses a tensile strength of from 55o to 600 lb. per in. per width per ply. There are two general methods of manufacture in use, one known as the round edge and the other as the folded. After the belt is formed and stitched, it is treated with the impregnating compound which makes it water-proof, and in some cases oil-proof. Generally, belts treated with a cheap filling are very stiff and hence do not conform to the pulley, making it more difficult to transmit the desired power. Textile belts are used more for conveyor service than for the transmission of power.
Hair power belting is used where special resistance is required to the action of acids, moisture and oils. Frequently this is made of cotton of the highest grade, having long fibre cotton yarn spe cially selected, and hair from the long-hair two-humped Bactrian camel of northern China, Mongolia and Siberia. It is woven on looms under tension which results in a closely woven, one-piece fabric, uniform throughout. It is then treated with special corn pounds for preserving its life and pliability. Prior to weaving, the hair is cleaned and the longest fibres are made up into yarn. The yarn is then rolled on spools into a "beam" which forms the warp of the belt ; a cotton filler and binder is used to complete the woven structure.