Patent ID: 11873376
Assignee: TORAY INDUSTRIES, INC.
Field: Other special machines (Mechanical engineering)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A fiber-reinforced resin material used for molding a fiber-reinforced resin that comprises a matrix resin and reinforcing fiber bundles A comprising chopped fiber bundles each including 100 or more single fibers, wherein a product of an average porosity within fiber bundles Pfav (−) represented by equation (1) and an average fiber bundle thickness tfav (mm) represented by equation (2) is 0 mm or more and 0.01 mm or less and a porosity of composite Pc (−) represented by equation (3) is 0.02 or more and 0.4 or less:, P
      fav
     
     =
     
      
       1
       n
      
      ⁢
      
       
        ∑
        
         i
         =
         1
        
        n
       
        
       
        
         p
         
          2
          ⁢
          i
         
        
        
         
          v
          
           f
           ⁢
           2
           ⁢
           i
          
         
         +
         
          v
          
           m
           ⁢
           2
           ⁢
           i
          
         
         +
         
          p
          
           2
           ⁢
           i
          
         
        
       
      
     
    
   
   
    
     (
     1
     )
    
   
  
 

 
  
   
    
     
      t
      fav
     
     =
     
      
       1
       n
      
      ⁢
      
       
        ∑
        
         i
         =
         1
        
        n
       
        
       
        t
        fi
       
      
     
    
   
   
    
     (
     2
     )
    
   
  
 

 
  
   
    
     
      P
      c
     
     =
     
      
       
        
         ∑
         
          j
          =
          1
         
         k
        
         
        
         p
         
          1
          ⁢
          j
         
        
       
       +
       
        
         ∑
         
          i
          =
          1
         
         n
        
         
        
         p
         
          2
          ⁢
          i
         
        
       
      
      
       
        
         ∑
         
          x
          =
          1
         
         l
        
         
        
         v
         
          f
          ⁢
          1
          ⁢
          x
         
        
       
       +
       
        
         ∑
         
          i
          =
          1
         
         n
        
         
        
         (
         
          
           v
           
            f
            ⁢
            2
            ⁢
            i
           
          
          +
          
           v
           
            m
            ⁢
            2
            ⁢
            i
           
          
          +
          
           p
           
            2
            ⁢
            i
           
          
         
         )
        
       
       +
       
        v
        
         m
         ⁢
         1
        
       
       +
       
        
         ∑
         
          j
          =
          1
         
         k
        
         
        
         p
         
          1
          ⁢
          j
         
        
       
      
     
    
   
   
    
     (
     3
     )
    
   
  
 

wherein, i=1, 2, . . . n, j=1, 2, . . . k, x=1, 2, . . . l, which are integers, and n, k, l represent, respectively, the number of all fiber bundles A, the number of voids, and the number of fibers other than the fiber bundles A included in a photographed sectional view, each parameter is:
vf1: area occupied by fibers other than fiber bundles A (mm2)
vf2: area occupied by fibers in fiber bundles A (mm2)
vm1: resin layer area (mm2)
vm2: resin area in fiber bundles A (mm2)
p1: area of voids present in resin layer (mm2)
p2: area of voids present in fiber bundles A (mm2)
tf: thickness of fiber bundle A (mm),
and each parameter is a value calculated from image analysis after binarization of a sectional view prepared by observing a section of a cut surface of the fiber-reinforced resin material in its thickness direction with an optical microscope, and photographing it at effective pixels of 1,600 (H)×1,200 (V) and a photograph magnification of 300 times.