Device for applying a material layer to a surface region of a workpiece, having a holding installation for receiving the workpiece; having an application installation; wherein the application installation and the holding installation can be moved relative to one another; wherein the holding installation is designed in such a manner that the workpiece is mounted on the holding installation in such a manner that the surface region of the workpiece points towards the application installation; wherein the application installation has a base; wherein the application installation has a hollow shoulder which is driven in a rotating manner about a longitudinal axis relative to the base; wherein the hollow shoulder has a depression which points towards a workpiece plane running perpendicularly to the longitudinal axis and which is delimited by an annular face encircling the longitudinal axis; wherein the hollow shoulder is provided with a passage opening which runs along the longitudinal axis and of which the diameter is smaller than that of the depression; wherein the application installation has a supply installation for application material, which on that side of the hollow shoulder that points away from the workpiece plane is disposed such that application material can be introduced from the supply installation, through the passage opening, into the depression; and wherein the application installation and the holding installation can be moved relative to one another in such a manner that during the relative movement the workpiece plane runs tangentially to the surface region of a workpiece mounted on the holding installation in that point in which the longitudinal axis intersects the surface region of the workpiece, characterized in that the hollow shoulder has a friction face which is disposed between the annular face and the passage opening, wherein the friction face surrounds the passage opening such that an application material introduced into the depression is continuously supplied with frictional energy by a rotation of the hollow shoulder, by virtue of the friction between the hollow shoulder and the application material, so that the application material in the depression is plasticized as a result of this input of energy. having a holding installation for receiving the workpiece; having an application installation; wherein the application installation and the holding installation can be moved relative to one another; wherein the holding installation is designed in such a manner that the workpiece is mounted on the holding installation in such a manner that the surface region of the workpiece points towards the application installation; wherein the application installation has a base; wherein the application installation has a hollow shoulder which is driven in a rotating manner about a longitudinal axis relative to the base; wherein the hollow shoulder has a depression which points towards a workpiece plane running perpendicularly to the longitudinal axis and which is delimited by an annular face encircling the longitudinal axis; wherein the hollow shoulder is provided with a passage opening which runs along the longitudinal axis and of which the diameter is smaller than that of the depression; wherein the application installation has a supply installation for application material, which on that side of the hollow shoulder that points away from the workpiece plane is disposed such that application material can be introduced from the supply installation, through the passage opening, into the depression; and wherein the application installation and the holding installation can be moved relative to one another in such a manner that during the relative movement the workpiece plane runs tangentially to the surface region of a workpiece mounted on the holding installation in that point in which the longitudinal axis intersects the surface region of the workpiece, characterized in that the hollow shoulder has a friction face which is disposed between the annular face and the passage opening, wherein the friction face surrounds the passage opening such that an application material introduced into the depression is continuously supplied with frictional energy by a rotation of the hollow shoulder, by virtue of the friction between the hollow shoulder and the application material, so that the application material in the depression is plasticized as a result of this input of energy.