Reduced friction edges

One common design is typified by a mbber belt mounted in tension. The belt is grooved to provide drainage toward its center. Covered with cloth, the belt has raised edges to contain the feed slurry, and is dragged over stationary vacuum boxes located at the belt center. Wear caused by friction between the belt and the vacuum chamber is reduced by using replacable, secondary wear belts made of a suitable material such as PTFE, terylene, etc. 

Because the basic fuel cell needs no mechanical drive, its operation is quiet and involves no frictional losses (Figure 2.100). These characteristics should make it possible to locate them near the final user, producing a more even distribution of the generation capacity. Auxiliaries, particularly fans and blowers, must be quiet therefore, they should be well supported to prevent their motion and be provided with variable-speed drives. In addition, the feathering of the blade edges and the use of noise-reducing enclosures are recommended. 

Grinding ). To further enhance performance and efficiency of expensive broaching tools, coatings were developed which clearly enhance tool life (see Coated Tools ). Especially, TiN coatings have established in industrial applications. High micro hardness leads to a minimization of wear, the chemical resistance reduces built-up edges as well as material adherence, and a small friction coefficient reduces the... 

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