SHEET MANUFACTURING DEVICE， METHOD FOR CONTROLLING SAME， AND SHEET MANUFACTURING METHOD

A sheet manufacturing apparatus that can adjust a roughness feeling (granularity) of an appearance of a sheet and can manufacture a sheet with a given roughness feeling is provided. The sheet manufacturing apparatus includes a fibrillating unit that fibrillates a raw material including fibers in a gas， an additive supply unit that supplies an additive， a mixing unit including a first rotating unit that mixes a fibrillated matter fibrillated by the fibrillating unit and the additive supplied by the additive supply unit， a depositing unit that deposits a mixture mixed by the mixing unit， a web forming unit including a mesh belt that transports a deposited material deposited by the depositing unit and a suction mechanism that sucks the deposited material to the mesh belt， and a control unit that changes granularity of a surface of the sheet by controlling at least one of a supply amount per unit time from the additive supply unit， a rotation velocity of the first rotating unit of the mixing unit， and a suction force of the suction mechanism.