Sheet manufacturing apparatus and method of manufacturing sheets

Abstract

A method of manufacturing a sheet, includes: moistening a web formed by depositing fibers; transporting the web downstream with the web pressed against a first roller by a pressing roller; after a transportation roller located downstream of the first roller nips the web, stretching the web with the pressing roller away from the first roller and the web; and drying the moistened web by heating the first roller, to manufacture a sheet.

What is claimed is: 
     
         1 . A method of manufacturing a sheet, comprising:
 depositing a material containing fibers to form a web;   moistening the formed web;   transporting the web downstream with the web pressed against a first roller by a pressing roller;   after a transportation roller located downstream of the first roller nips the web, stretching the web with the pressing roller away from the first roller and the web; and   drying the moistened web by heating the first roller, to manufacture a sheet.   
     
     
         2 . The method of manufacturing a sheet according to  claim 1 , further comprising
 when a leading end of the web reaches the transportation roller located downstream of the first roller and configured to transport the web,   pressing the web wound around the first roller against the first roller by using the pressing roller.   
     
     
         3 . The method of manufacturing a sheet according to  claim 1 , further comprising:
 measuring temperature of the first roller; and   when the first roller is rotating, and the temperature of the first roller becomes a set temperature,   pressing the web against the first roller by using the pressing roller.   
     
     
         4 . The method of manufacturing a sheet according to  claim 1 , further comprising
 after the pressing roller moves away from the web, pressing the web against the first roller by using the pressing roller.   
     
     
         5 . The method of manufacturing a sheet according to  claim 4 , wherein
 a pressing load of the pressing roller before the pressing roller moves away is lower than a pressing load of the pressing roller for pressing after the pressing roller once moves away.   
     
     
         6 . A sheet manufacturing apparatus comprising:
 a deposition unit configured to deposit a material containing fibers to form a web;   a humidification unit configured to moisten the formed web; and   a forming unit configured to form the web into a sheet, wherein   the forming unit includes
 a first roller configured to heat and dry the moistened web, 
 a transportation roller located downstream of the first roller and configured to nip and transport the web, and 
 a pressing roller configured to press the web against the first roller, 
   the pressing roller presses the web against the first roller during a period from a point before a leading end of the web reaches a position of the pressing roller until the transportation roller nips the web, and   the pressing roller moves away from the first roller and the web after the transportation roller nips the web.   
     
     
         7 . The sheet manufacturing apparatus according to  claim 6 , wherein
 the forming unit further includes a spring configured to change a pressing load of the pressing roller for pressing the sheet against the first roller.