Process for applying a foamable reaction mixture onto a moving outerlayer, wherein the reaction mixture is applied onto the outerlayer from discharge openings and the outerlayer moves at a speed of ≥ 15 meters per minute relative to the discharge openings, characterized in that the reaction mixture is applied onto the outerlayer from ≥ 7 discharge openings simultaneously, and in that the process further comprises the steps of: - providing a plurality of mixing heads (100, 110, 120), wherein each mixing head is adapted for mixing two or more reactant streams to afford one product stream; - providing a plurality of rake applicators, wherein the number of rake applicators corresponds to the number of mixing heads (100, 110, 120), each rake applicator is connected to a product stream of a mixing head and each rake applicator has ≥ 4 discharge openings; - mixing two or more reactant streams in each of the mixing heads (100, 110, 120) to obtain a product stream exiting each of the mixing heads, wherein the product stream comprises a foamable reaction mixture; - applying the reaction mixture from the discharge openings of the rake applicators onto the outerlayer, wherein at least two rake applicators (510, 520) are arranged one behind the other viewed in the direction of motion of the outerlayer and the reaction mixture discharged from the discharge openings of one rake applicator at least partially contacts the reaction mixture discharged from the discharge openings of the other rake applicator, and the at least two rake applicators (510, 520) are offset by a length corresponding at a maximum to 50% of the distance between two adjacent discharge openings of the rake applicators (510, 520), so that the reaction mixture discharged from the discharge openings of a rake applicator in streams flows between streams of the reaction mixture discharged from the other rake applicator. characterized in that the reaction mixture is applied onto the outerlayer from ≥ 7 discharge openings simultaneously, and in that the process further comprises the steps of: - providing a plurality of mixing heads (100, 110, 120), wherein each mixing head is adapted for mixing two or more reactant streams to afford one product stream; - providing a plurality of rake applicators, wherein the number of rake applicators corresponds to the number of mixing heads (100, 110, 120), each rake applicator is connected to a product stream of a mixing head and each rake applicator has ≥ 4 discharge openings; - mixing two or more reactant streams in each of the mixing heads (100, 110, 120) to obtain a product stream exiting each of the mixing heads, wherein the product stream comprises a foamable reaction mixture; - applying the reaction mixture from the discharge openings of the rake applicators onto the outerlayer, - providing a plurality of mixing heads (100, 110, 120), wherein each mixing head is adapted for mixing two or more reactant streams to afford one product stream; - providing a plurality of rake applicators, wherein the number of rake applicators corresponds to the number of mixing heads (100, 110, 120), each rake applicator is connected to a product stream of a mixing head and each rake applicator has ≥ 4 discharge openings; - mixing two or more reactant streams in each of the mixing heads (100, 110, 120) to obtain a product stream exiting each of the mixing heads, wherein the product stream comprises a foamable reaction mixture; - applying the reaction mixture from the discharge openings of the rake applicators onto the outerlayer, wherein at least two rake applicators (510, 520) are arranged one behind the other viewed in the direction of motion of the outerlayer and the reaction mixture discharged from the discharge openings of one rake applicator at least partially contacts the reaction mixture discharged from the discharge openings of the other rake applicator, and the at least two rake applicators (510, 520) are offset by a length corresponding at a maximum to 50% of the distance between two adjacent discharge openings of the rake applicators (510, 520), so that the reaction mixture discharged from the discharge openings of a rake applicator in streams flows between streams of the reaction mixture discharged from the other rake applicator.