Sheet manufacturing apparatus and method for manufacturing sheet

A sheet manufacturing apparatus, comprising

• a screening unit configured to screen a defibrated material obtained by defibration treatment, and
• a sheet forming unit configured to form a sheet with the defibrated material screened by the screening unit,
• the screening unit having a first screening unit to which a plurality of first openings are provided and a second screening unit to which a plurality of second openings larger than the first openings are provided, the defibrated material being screened by the first screening unit and the second screening unit,
• the defibrated material being screened by one of the first screening unit and the second screening unit, and thereafter screened by the other of the first screening unit and the second screening unit, and
• the sheet forming unit being configured to form the sheet with the defibrated material that does not pass through the first openings and passes through the second openings.