Abstract: A method is provided for the continuous production of sealing sheeting impervious to water and/or oil, in the case of which between a substrate layer and a non-woven material covering layer a swellable clay is needle punched in position, a swellable clay additionally strewn on the top side of the covering layer being at the same time incorporated in the covering layer. After this the swellable clay present in the covering is moistened and dried again. In accordance with a modified form of the invention use is only made of a substrate consisting of a non-woven material, a woven fabric, a knitted fabric and/or a film, the film being a synthetic resin film, a synthetic resin film reinforced with fabric or paper, and a large pored non-woven material or a non-consolidated intersecting fiber crimped non-woven material or a random fiber non-woven material on which the pulverulent swellable clay is strewn, incorporated by needle punching, moistened and dried.

Abstract: Water- and/or oil-tight bentonite sealing sheets or mats are produced which after laying have a water-tight and frictional interconnection or joint in the overlapped part thereof. This is achieved by filling the pore space in the overlapped zone with bentonite and following in situ needle punching of the overlapped zone or with bitumen or synthetic resin systems, optionally filled with bentonite, and later bonding or welding of the overlapped zone. It is also possible to weld the overlapped zone together as "films" and, then to bond or weld such zones.

Abstract: A water and/or oil-impermeable sealing mat is provided in form of a bentonite non-woven fabric combination with the possibility of transmitting shear from one batt layer to the other, i.e. on a slope shearing forces can be transmitted by the covering batt material through the layer of swellable clay into the supporting batt material. Such a sealing mat is a fiber-reinforced mineral seal permitting the transmission of shearing forces on slopes, without the risk of the layer of swellable clay itself becoming the preferred sliding plane. The sealing mat consists of a non-woven textile material as substrate layer, a layer of swellable clay, preferably sodium bentonite, and a cover layer consisting preferably also of a non-woven textile material, all three layers having been needlepunched together in the conventional manner in a needle loom. When moistened, the clay swells and forms the water and/or oil-impermeable layer.

Abstract: A water and/or oil-impermeable sealing mat is provided in form of a bentonite non-woven fabric combination with the possibility of transmitting thrust from one batt layer to the other, i.e. on a slope thrust forces can be transmitted by the covering batt material through the layer of swellable clay into the supporting batt material. Such a sealing mat is a fiber-reinforced mineral seal permitting the transmission of thrust forces on slopes, without the risk of the layer of swellable clay itself becoming the preferred sliding plane. The sealing mat consists of a non-woven textile material as substrate layer, a layer of swellable clay, preferably sodium bentonite, and a cover layer consisting preferably also of a non-woven textile material, all three layers having been needled together in the conventional manner in a needle loom. When moistened, the clay swells and forms the water and/or oil-impermeable layer.