Paster roller

Abstract

An air exhausting concave portion is provided on an outer peripheral surface of a paster roller that pushes a first web and a second web in their overlapped state. Both end portions of the outer peripheral surface of the paster roller are chamfered. The paster roller is formed like a crown shape.

What is claimed is:  
     
         1 . A paster roller comprising: 
 an air exhausting concave portion provided on an outer peripheral surface thereof for releasing an air between a first web and the outer peripheral surface,    when the outer peripheral surface pushes the first web to a second web in their overlapped state.    
     
     
         2 . The paster roller as set forth in  claim 1 , wherein the air exhausting concave portion comprises a spiral groove provided on the outer peripheral surface of the paster roller.  
     
     
         3 . The paster roller as set forth in  claim 2 , wherein the groove has a pitch in the range from 1 mm to 10 mm, and a depth on the range from 0.1 mm to 1 mm.  
     
     
         4 . A paster roller comprising: 
 chamfered portions formed at both end portions of an outer peripheral surface thereof.    
     
     
         5 . The paster roller as set forth in  claim 4 , wherein the chamfered port ions contain portions o f the outer peripheral surface of the paster roller that are opposed to portions in the range from 20 mm to 50 mm from both end portions of the web, which contacts to the outer peripheral surface of the paster roller, in the width direction.  
     
     
         6 . The paster roller as set forth in  claim 4 , wherein each of the chamfered portions includes a flat portion that is inclined at a predetermined inclination angle ranged from 3° to 20° relative to the center axis of the paster roller in a sectional view.  
     
     
         7 . The paster roller as set forth in  claim 4 , further comprising: 
 a core bar formed a substantially cylindrical shape; and    a coated elastic body provided on the outer peripheral surface of the core bar.    
     
     
         8 . The paster roller as set forth in  claim 7 , wherein the core bar is made of aluminum.  
     
     
         9 . The paster roller as set forth in  claim 7 , wherein the coated elastic body is made of resin, and the coated elastic body has hardness (HsA) in the range from 40 to 70.  
     
     
         10 . A paster roller for pushing a first web and a second web in their overlapped state, wherein the paster roller is formed into a crown shape, and the paster roller has a predetermined crown.  
     
     
         11 . The paster roller as set forth in  claim 10 , wherein the predetermined crown has a range from 0.5 mm to 2.5 mm per a width 1000 mm of the paster roller.  
     
     
         12 . The paster roller as set forth in  claim 10 , further comprising: 
 a core bar formed a substantially cylindrical shape; and    a coated elastic body provided on the outer peripheral surface of the core bar for pushing portion of the paster roller.    
     
     
         13 . The paster roller as set forth in  claim 12 , wherein the core bar is made of aluminum, the coated elastic body is made of resin, and the coated elastic body has hardness (Has) in the range from 40 to 70.