Sheet manufacturing apparatus

Abstract

A sheet manufacturing apparatus 1 includes an accumulation section 50 that forms a web W; a transport belt 621 that comes into contact with one surface of the web W to hold the web W and transports the web W; a suction section 200 that is provided above the transport belt 621 to cause the web W to be adsorbed to the transport belt 621; and a sheet forming section 70 that forms the sheet with the web W, in which the suction section 200 has a first duct 210, a second duct 220 provided downstream of the first duct 210 in the transport direction, and a third duct 230 provided downstream of the second duct 220 in the transport direction, and a plurality of third suction holes 239 a and 239 b are provided in a suction region 233 of the third duct 230, the suction region 233 includes a first region 233 a and a second region 233 b located downstream of the first region 233 a in the transport direction, and the number of the third suction holes 239 b provided in the second region 233 b is smaller than the number of the third suction holes 239 a provided in the first region 233 a.

What is claimed is: 
     
         1 . A sheet manufacturing apparatus that manufactures a sheet from a material containing a fiber, the sheet manufacturing apparatus comprising:
 an accumulation section that accumulates the material by an airflow to form a web;   a transport belt that comes into contact with one surface of the web to hold the web and transports the web along a transport direction;   a suction section that is provided above the transport belt to cause the web to be adsorbed to the transport belt by suction; and   a sheet forming section that forms the sheet by pressurizing the web, wherein   the suction section has a first duct, a second duct provided downstream of the first duct in the transport direction, and a third duct provided downstream of the second duct in the transport direction, and a plurality of suction holes for suctioning air are provided in a suction region of the third duct,   the suction region includes a first region and a second region located downstream of the first region in the transport direction, and   the number of the suction holes provided in the second region is smaller than the number of the suction holes provided in the first region.   
     
     
         2 . The sheet manufacturing apparatus according to  claim 1 , further comprising:
 a humidification section that is provided to face the transport belt and applies moisture from another surface side of the web.   
     
     
         3 . The sheet manufacturing apparatus according to  claim 2 , wherein
 the humidification section has a discharge port for discharging humidified air, and   the second duct and the discharge port are disposed to face each other.   
     
     
         4 . The sheet manufacturing apparatus according to  claim 1 , wherein
 the sheet forming section has pressurizing rollers that are provided downstream of the transport belt in the transport direction and pressurize the web separated from the transport belt.