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Diaphragm

Supported diaphragms are produced from a wide variety of fabric, varying strength, weights, and weaves. The fabrics themselves range from natural fibers, such as silk and cotton to the man-made fibers and high strength arimids. The elastomeric coatings can be put on both sides of the fabric in equal thickness or an unbalanced coating. Many applications require elastomeric coatings on only one side such as applications where the pressure differential is in one direction. When knit fabrics are employed, the coating is usually on one side and the same side as the pressure. This allows the fabric to support the coating on both sides for flat diaphragms.

This construction suggests possibilities for obtaining a good deal more stroke with a flat diaphragm. The selection of the fabric substrate, in terms of strength, weight and flex life will greatly depend on the application.                                                                           

Fabric supported diaphragms have a distinct advantage over homogeneous diaphragms. Supported diaphragms have less tendency to stretch under pressure conditions. Because the rubber is continually under stress conditions it tends to degrade physical properties quicker. Most importantly, fabric substrate takes all of the stress from the rubber leaving the rubber to work in the least stress conditions.