Elastic toroidal shell can be made of strong film and fabric-film materials and their combinations with various mechanical, absorbing, magnetic, electrical properties and filled with flowing medium.
Liquids and/or gases as well as gaseous mixtures can be used as both flowing a medium and a working body in the shells.
There are new methods of cutting and new technological facilities of mounting the shells.
Requirements for elastic toroidal shells are defined by the following characteristics: internal pressure, gas- and hydro-permeability, form stability, strength and stiffness features, elasticity, durability, criteria of working ability, including operational ones. In order to meet these requirements it is necessary to use up-to-date materials for making shells. These materials are: butadiene-nitric rubbers, film and fabric-film materials on the base of polyethylene, polyamide, polypropylene, polyethyleneterephthalate, reinforced with superstrong multilayer fabric materials, for example, on the base of aramide fibres and volumetric-film structures with internal and/or external metallization.
Besides it is possible to integrate electronic components on the surface or into the structure of the shell to provide the control over the tore mechanism (elastic functional and/or integrated electronics)
Along with enhanced strength characteristics and extremely high thermal stability, the above materials have high resistance to chemical reagents, petroleum products, mineral oils and other aggressive mediums.
Such technological processes as the method of direct hot pressing (mould care), cutting and subsequent glueing of calendered cured rubbers, impregnation and glueing of multilayer film-fabric materials, cutting and welding of film and film-fabric materials are well-known and can be successfully used for making shells ets.