Abstract: The present invention is related to a device for removing impurities from an agricultural fibrous material. In addition, the invention is related to a method for obtaining the same. The device according to the invention comprises: a processing unit (4) having an inlet (16), an outlet (38), and a first (18) and second holding member (19) defining a holding space there between for holding said material, wherein at least said first holding member is moveable; a drive unit for driving at least said first moveable holding member to obtain a compression and expansion of said holding space; an impurities collection unit (5) coupled to or disposed in said processing unit to collect impurities released from said material; The compression and expansion of the holding space ensures an effective release of impurities from the fibers of the material.