Patent ID: 8388994

Claim:
Fibrous non-woven polymeric material, wherein the material is composed of a plurality of closely interconnected short fibers having a diameter in the nano-micrometer range, being inclined with respect to each other and the material is a three-dimensional structure; and wherein the material is manufactured using a pneumatic spraying method comprising the following steps: a. providing an atomizing device; b. providing a substrate; c. supplying to the atomizing device at least a liquid composition including at least a volatile solvent component and at least a non-volatile polymeric component wherein the volatile solvent component is a solvent for the non-volatile polymeric component; d. atomizing the liquid composition by supplying an atomizing gas stream to the atomizing device to form droplets smaller than 10 microns in diameter of the solvent component and evaporating the solvent component to cause the polymeric component to undergo at least a partial solidification and forming a plurality of discrete fibers comprising the polymeric component having a length of 15 to 500 microns and a diameter in the nano-micrometer range; and wherein at least 10% of all fibers have a length of more than 15 microns; and e. depositing the fibers on the substrate so that a mesh structure composed of a plurality of interconnected short fibers is formed, and the fibers are in a near-dry state and remaining solvent ensuring a good adhesion and tight connection of the fibers.