A separator as part of a sheet manufacturing apparatus has a mesh drum configured as a cylinder that can rotate and has mesh in at least part of the side; and a case that houses the mesh drum. The case has a supply port and a recovery port that communicate with an inside area, which is the inside of the mesh drum; a discharge port that communicates with a discharge area, which is outside the side of the mesh drum; and an inside wall segregating at least part of the inside area, forming a material recovery area. First screened material is supplied from the supply port to the inside area. In the material recovery area, the separator recovers accreted material, which is first screened material that was supplied through the supply port and accreted on the inside surface of the mesh drum, from the recovery port.