Patent ID: 9068802
Filing Date: 2015-06-30
Classification: F41H

Abstract:
1. A ballistic protection, including at least one rigid ballistic structure and at least one flexible ballistic structure, co-operating to dissipate energy associated to an incident bullet impact, the at least one rigid ballistic structure and the at least one flexible ballistic structure being separated by at least a first discontinuity layer including elements made of a material selected from the group of: rigid or flexible plastomeric foams, elastomeric foams, viscoelastic foams, paper, woven fabrics, non-woven fabrics, felts, honeycomb structures, elastomeric polymers, plastomeric polymers, viscous polymers, viscoelastic polymers, or mixtures thereof, the at least one ballistic rigid structure including: at least a first textile rigid layer including one or more of the following: UHMW polyethylene, aramidic, copolyaramidic, polybenzoossazole, polybenzothiazole, liquid crystal, rigid rod fibers; at least a second textile rigid layer including one or more of the following: UHMW polyethylene, aramidic, copolyaramidic, polybenzoossazole, polybenzothiazole, liquid crystal, rigid rod, glass, carbon fibers; and at least a third layer interposed between the at least first textile rigid layer and the at least second textile rigid layer, wherein the at least third layer of the rigid ballistic structure is an element that covers only a portion of a surface corresponding to the surface of the first textile rigid layer, and wherein the at least third layer of the rigid ballistic structure has a shape substantially of a frame and having a middle portion including elements made of a material selected from the group of: rigid or flexible plastomeric foams, elastomeric foams, viscoelastic foams, paper, woven fabrics, non-woven fabrics, felts, honeycomb structures, elastomeric polymers, plastomeric polymers, viscous polymers, viscoelastic polymers, or mixtures thereof; wherein the material of the at least first discontinuity layer and of the at least third layer of the rigid ballistic structure are selected so that the speed of propagation of a sound wave through the at least first discontinuity layer and the at least third layer of the rigid ballistic structure is less than 50% of the speed of propagation of a sound wave through the fibers of the first rigid layer.