Press belt and shoe press roll

Abstract

A press belt 2 comprises both end corresponding regions B positioned so as to correspond to both ends of a press roll 1 or a pressing shoe 3 in the width direction and a center region A positioned between the both end corresponding regions B. The center region A has a predetermined thickness and constitutes a pressed part pressed by pressing means. The end corresponding regions B have a thickness smaller than that of the center region A to form recessed parts and constitute pressure escape parts for allowing the pressure from the pressing means to escape.

1 . A press belt in a press machine comprising an endless rotating press belt and pressing means positioned inside and/or outside the periphery of said press belt, comprising:
 both end corresponding regions positioned so as to correspond to both ends of said pressing means in a width direction; and   a center region positioned between said both end corresponding regions, wherein   said center region has a predetermined thickness and constitutes a pressed part pressed by said pressing means, and   said both end corresponding regions have a thickness smaller than that of said center region to form recessed parts and constitute pressure escape parts for allowing the pressure from said pressing means to escape.   
     
     
         2 . The press belt according to  claim 1 , wherein
 the depth of said recessed part is larger than the variation of the thickness of said center region when pressed by said pressing means.   
     
     
         3 . The press belt according to  claim 1 , wherein
 the depth of the recessed part is not less than 1.0 mm.   
     
     
         4 . The press belt according to  claim 1 , wherein
 said recessed part is formed in the outer peripheral surface of the press belt.   
     
     
         5 . The press belt according to  claim 1 , wherein
 said recessed part is formed in the inner peripheral surface of the press belt.   
     
     
         6 . The press belt according to  claim 1 , comprising an endmost region having the same thickness as that of said both end corresponding regions, outside said both end corresponding regions in the width direction. 
     
     
         7 . The press belt according to  claim 1 , comprising an endmost region having the same thickness as that of said center region, outside said both end corresponding regions in the width direction. 
     
     
         8 . The press belt according to  claim 1 , comprising a reinforcement layer extending at said center region and said both end corresponding regions, and an upper elastic layer formed thereon, wherein
 said upper elastic layer has said recessed part.   
     
     
         9 . The press belt according to  claim 1 , comprising a reinforcement layer extending at said center region and said both end corresponding regions, and an upper elastic layer formed thereon and extending only at said center region, wherein
 the exposed part of the outer peripheral surface of said reinforcement layer forms said recessed part.   
     
     
         10 . The press belt according to  claim 8 , wherein
 many drain grooves extending along the traveling direction of the belt are formed in the outer peripheral surface of said upper elastic layer.   
     
     
         11 . The press belt according to  claim 10 , wherein
 the depth of said recessed part is the same as that of said drain groove or more.   
     
     
         12 . The press belt according to  claim 1 , comprising a reinforcement layer extending at said center region and said both end corresponding regions and a lower elastic layer formed thereunder, wherein
 said lower elastic layer has said recessed part.   
     
     
         13 . The press belt according to  claim 1 , comprising a reinforcement layer extending at said center region and said both end corresponding regions, and a lower elastic layer formed thereunder and extending only at said center region, wherein
 the exposed part of the inner peripheral surface of said reinforcement layer forms said recessed part.   
     
     
         14 . A shoe press roll comprising:
 an outer roll comprising an endless-shaped press belt and pressing shoe positioned inside the periphery of said outer roll as pressing means, wherein   said outer roll is the press belt according to  claim 1 .   
     
     
         15 . The shoe press roll according to  claim 14 , wherein
 both ends of the center region of said press belt having a predetermined thickness are positioned inside both edge parts of said pressing shoe in the width direction.