Dosing device for dosing particles of a granular material comprising a reservoir storing the particles of the granular material, a dosing disc, and a suction device, wherein the dosing disc is rotatable around a rotational axis, the reservoir has a dosing opening facing the dosing disc, the dosing opening being arranged above the dosing disc such that a dosing gap is formed between a surface of the dosing disc and a surface surrounding the dosing opening, the dosing opening being arranged eccentric with respect to the rotational axis, the suction device having an opening facing the dosing disc, the opening being arranged above the dosing disc and likewise being arranged eccentric with respect to the rotational axis, the size of the dosing gap being chosen such that a monolayer of the particles of the granular material is dosed from the reservoir through the dosing opening onto the surface of the dosing disc, the suction device being constructed and arranged such that the monolayer of particles is being sucked into the suction device and mixed with a gas stream when the particles are being transported to the suction device by rotation of the dosing disc, wherein the size of the dosing gap is larger than the average diameter of the particles and smaller than or equal to two times the average diameter of the particles and the dosing disc has a surface flatness in the range of 0 to 5 μm and/or has a surface roughness in the range of from 0.1 to 4 μm, and wherein the surface of the dosing disc is patterned such that the surface has a plurality of indentations, the shape of the indentations being chosen such that exactly one particle of the granular material fits in one of the indentations. a reservoir storing the particles of the granular material, a dosing disc, and a suction device, wherein the dosing disc is rotatable around a rotational axis, the reservoir has a dosing opening facing the dosing disc, the dosing opening being arranged above the dosing disc such that a dosing gap is formed between a surface of the dosing disc and a surface surrounding the dosing opening, the dosing opening being arranged eccentric with respect to the rotational axis, the suction device having an opening facing the dosing disc, the opening being arranged above the dosing disc and likewise being arranged eccentric with respect to the rotational axis, the size of the dosing gap being chosen such that a monolayer of the particles of the granular material is dosed from the reservoir through the dosing opening onto the surface of the dosing disc, the suction device being constructed and arranged such that the monolayer of particles is being sucked into the suction device and mixed with a gas stream when the particles are being transported to the suction device by rotation of the dosing disc, wherein the size of the dosing gap is larger than the average diameter of the particles and smaller than or equal to two times the average diameter of the particles and the dosing disc has a surface flatness in the range of 0 to 5 μm and/or has a surface roughness in the range of from 0.1 to 4 μm, and wherein the surface of the dosing disc is patterned such that the surface has a plurality of indentations, the shape of the indentations being chosen such that exactly one particle of the granular material fits in one of the indentations.