Device and method for foaming a viscous material

A device (01, 19, 23) for foaming a viscous material (02), said viscous material (02) being conveyed through a first conveyor pipe (05) using a first conveying means (04) at a first conveying pressure, and a gas (07) being conveyed through a second conveyor pipe (08) at a second conveying pressure, and the second conveyor pipe (08) and the first conveyor pipe (05) becoming conjoined at an opening (15), and a discharge device (17) being provided downstream of the opening (15) so as to allow a pressure-relieving discharge of the mixture (14) made up of viscous material (02) and gas (07), characterized in that a gas injection valve (09) is arranged at the opening (15), said gas injection valve (09) allowing to inject gas bubbles (25) into the viscous material (02);

• characterized in that the conveying means (04) allows to convey the viscous material to the opening (15) at the first conveying pressure of at least 50 bar through the first conveyor pipe (05).