Abstract: A process and apparatus for manufacturing a microfiber structure for absorbing impact energy, sound energy and/or temperature, the structure being used in the ballistic field and in the sound and temperature isolation fields, wherein the method comprises to provide a plurality of threads consisting of microfibers, subjecting the threads to a pressurized air jet to open the threads by separating the microfibers into each thread and entangling the threads to form a mass of loosely-entangled microfibers, with the mass being confined the mass into a pack which may be appropriately compacted.

Abstract: Described is a particular procedure to make structures from longitudinal helical metal strips, the same are adecuate to conform different objects, such as plates, planks, sheets, tubes, shafts, etc. and they are porous, flexible, highly resistant and with great ability to absorb the different applications to which they may be subjected, i.e. mechanical, caloric, sound, etc. The procedure consists in stinging the entangled metal strips, each metal strip with its adyacent, until "layers" are formed, and these, in turn, are entangled to each other until a structure is formed, which gaps determining the porosity will be at least the same size than the thickness of the filament constituting the metal strip. The layers may be formed by metal strips made of any type of material (metallic, synthetic, etc.) and they may be combined among them.