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belt

History :

since 19th century the primitive conveyor belts were applied to the system  of conveyor belts.

development of conveyor belts for carrying coal, ores and other products was efforts of Thomas Robins that invented in 1892. 

steel conveyor belt is invented by Sandvik and in 1905 Richard Sutcliffe produced the first conveyor belts for using in coal mines which led to a revolution in the mining industries.

Henry Ford presented the assembly lines of conveyor belt at Ford Motor Company's highland Park , Michigan factory in 1913.

After several inventors'efforts, in 1970,the first registration of patent for all plastic ,modular belting, is done by Intralox which was a Louisiana-based company.

the belt is consisted of some material layers.

common belts have three layers, a top cover , a carcass layer and the bottom. carcass provides linear strength and shape.

structure of belt:

in one hand the carcass often is a woven or metal fabric consists a wrap and weft. wrap deals with longitudinal cords.

characteristics of resistance and elasticity introduce properties of the belt; on the other hand, the weft presents total set of transversal cables which anable the belt endure the pressure of cutting, tearing  and other impacts and also against flexibility.

the famous and common carcass materials are steel , polyester , nylon , cotton and aramid.the top and bottom covers also is made o various rubber or plastic compounds which according to the application of belts are specified.