A device (1) for compacting, on a first conveyor belt (2) which is permeable to air, a solid substance consisting of loose particles, deposited in doses (7) at regular intervals by dosing means (3) which are synchronised with the first conveyor belt (2), comprises a second conveyor belt (4) which moves at the same speed as and is located below the first belt (2), the second belt having through-holes (5) at intervals (6) along its length corresponding with the intervals used to deposit the doses (7) of the substance; and vacuum means (8; 12, 13) which are in continuous communication with the holes (5) so that, through the first conveyor belt (2), they exert suction on the doses (7) of the substance, keeping the particles of the substance together and in contact with the conveyor belt (2) below them.
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