FIELD: filter materials used for suspensions. SUBSTANCE: multi-layer nonwoven material consists of three fibrous layers of synthetic cloth. Each reinforcing layer is laid between two fibrous layers. Layers are fastened together by needle piercing; bundless formed at this pass from outer fibrous layers to intermediate fibrous layer through reinforcing layers at depth equal to thickness of this layer. Material is thermally stable. EFFECT: possibility of performing filtering and transportation functions; enhanced strength, stability and filtering properties. 3 cl, 1 dwg
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