Dosing device for dosing a granular material, spraying device and method for applying a granular material to a substrate

Dosing device (10) for dosing a granular material (16) comprising

• a reservoir (12) for storing the granular material (16),
• a dosing disc (20), and
• a suction device (24), wherein
• the dosing disc (20) is rotatable around a rotational axis (22),
• the reservoir (12) has a dosing opening (14) facing the dosing disc (20),
• the dosing opening (14) being arranged above the dosing disc (20) such that a dosing gap is formed between a surface of the dosing disc (20) and a surface (26) surrounding the dosing opening (14), the dosing opening (14) being arranged eccentric with respect to the rotational axis (22),
• the suction device (24) having an opening (25) facing the dosing disc (20), the opening (25) being arranged above the dosing disc (20) and likewise being arranged eccentric with respect to the rotational axis (22),
• the size of the dosing gap being chosen such that a monolayer (18) of the particles (17) of the granular material (16) is dosed from the reservoir (12) through the dosing opening (14) onto the surface of the dosing disc (20),
• the suction device (24) being constructed and arranged such that the monolayer (18) of particles (17) is being sucked into the suction device (24) and mixed with a gas stream when the particles (17) are being transported to the suction device (24) by rotation of the dosing disc (20).