Method of manufacturing laminate and grommet used for the method

Abstract

A method of manufacturing a laminate obtained by laminating a plurality of plate members such as wiring plates ( 1 ) and prepregs ( 2 ), comprising: a step of temporarily fixing the plate members by a grommet ( 3 ) having plural resin filling holes ( 9 ) formed on the side surface thereof to obtain a temporarily-fixed laminate ( 5 ); and a step of heating and pressurizing the temporarily-fixed laminate ( 5 ) to fill the resin melted from the prepregs ( 2 ) of the temporarily-fixed laminate ( 5 ) through the resin filling holes ( 9 ) of the grommet ( 3 ) into the throughhole ( 6 ) of the grommet ( 3 ).

What is claimed is:  
     
         1 . A method of manufacturing a laminate, comprising: 
 a step of temporarily fixing a plurality of plate members by a grommet having plural resin filling holes formed on the side surface thereof to obtain a temporarily-fixed laminate; and    a step of heating and pressurizing the temporarily-fixed laminate to fill resin melted from the temporarily-fixed laminate through the resin filling holes of the grommet into the grommet.    
     
     
         2 . A method of manufacturing a laminate, comprising: 
 a step of temporarily fixing wiring plates and prepregs by a grommet having plural resin filling holes formed on the side surface thereof to obtain a temporarily-fixed laminate; and    a step of heating and pressurizing the temporarily-fixed laminate to fill the resin melted from the temporarily-fixed laminate through the resin filling holes of the grommet into the grommet.    
     
     
         3 . The laminate manufacturing method as claimed in    claim 2   , wherein the resin is melted from the prepregs.  
     
     
         4 . A grommet comprising a tube-shaped side surface and plural resin filling holes formed on the side surface.  
     
     
         5 . The grommet as claimed in    claim 4   , wherein each of said resin filling holes is designed in a circular shape, in a rectangular shape or in a reticular shape.  
     
     
         6 . The grommet as claimed in    claim 4   , wherein the size (A) of an opening portion of each of said resin filling holes is set as follows: 0.005 mm 2 ≦(A)≦1.0 mm 2 .  
     
     
         7 . The grommet as claimed in    claim 4   , wherein the total area of an opening portion of said resin filling holes is set in the range from 20% to 40% of the total area of the side surface.  
     
     
         8 . The grommet as claimed in    claim 4   , further comprising a flange portion at one end of said tube-shaped side surface.  
     
     
         9 . The grommet as claimed in    claim 8   , wherein tooth-shaped portions are formed on the periphery of said flange portion.  
     
     
         10 . The grommet as claimed in    claim 9   , wherein the length (B) of of said tooth-shaped portions is set as follows: 0.03 mm≦(B)≦0.07 mm.  
     
     
         11 . The grommet as claimed in    claim 9   , wherein the pitch (C) of said tooth-shaped portions is set as follows: 0.05 mm≦(C)≦0.10 mm.