PROCESS OF CONTINUOUS MANUFACTURE OF WATER- AND OIL-PROOF SEALING MAT (VARIANTS) Russian patent published in 1997 - IPC

FIELD: hydraulic engineering. SUBSTANCE: in compliance with proposed process of continuous manufacture of water- and oil-proof sealing mat layer of clay capable of swelling is laid between carrying layer and cover layer made of unwoven material. Additional layer of clay is applied to cover layer. Then layers are sewed. Clay capable of swelling is wetted and dried. In accordance with changed form of make carrying layer can be composed of unwoven material or woven material, knitted material and/or film. Film can be produced from synthetic material, or synthetic material reinforced by woven material or paper, from larger-pore unwoven material or from nonreinforced fleece with entangled fibres of from structure with inoriented fibers. Layer of powder-like clay capable of swelling is applied on such carrying layer, then everything is pierced with needles, wetted and dried, Knitting technique can be used instead of piercing with needles. EFFECT: facilitated manufacture. 7 cl