Separation device and fiber body deposition apparatus

A separation device comprising:

• a movable mesh that has a first surface and a second surface in a front and back relationship;
• a first ejection unit that has a first ejection port facing the first surface, the first ejection unit ejecting a material containing a fiber together with gas from the first ejection port and supplying the material onto the first surface of the mesh;
• a first suction unit that is disposed on a side of the second surface of the mesh and has a first suction port facing the second surface, the first suction unit being configured to suck a part of the material supplied onto the first surface together with gas via the first suction port;
• a second ejection unit that is disposed on the side of the second surface of the mesh, is disposed downstream in a movement direction of the mesh with respect to the first suction unit, and has a second ejection port facing the second surface, the second ejection unit ejecting gas toward the second surface from the second ejection port;
• and
• a second suction unit that is disposed on a side of the first surface of the mesh and has a second suction port facing the first surface, the second suction unit sucking and collecting, via the second suction port, the material that does not pass through the mesh by the first suction unit and remains on the first surface, wherein
• Q1<Q2 and Q3<Q4, where a flow rate of gas ejected from the first ejection unit is Q1, a flow rate of gas sucked by the first suction unit is Q2, a flow rate of gas ejected from the second ejection unit is Q3, and a flow rate of gas sucked by the second suction unit is Q4, and
• S1<S2 and S3<S4, where an opening area of the first ejection port is S1, an opening area of the first suction port is S2, an opening area of the second ejection port is S3, and an opening area of a second suction port is S4.