Abrasive disc with lateral cover layer

Abstract

A grinding disc includes an inner layer ( 20 ) which is made of grindable material (containing abrasive particles) and an outer layer ( 20 ) which covers at least a portion of the surface of the inner layer ( 50 ) and which is made of non-grindable material (i.e. not-containing abrasive grain).

1 . A nonwoven abrasive disc comprising:
 an inner layer having opposed first and second major surfaces, wherein the inner layer comprises a first nonwoven material and abrasive particles; and   an outer layer comprising a second nonwoven material arranged on at least a portion of the inner layer;   wherein the outer layer is substantially free of abrasive particles.   
     
     
         2 . A nonwoven abrasive as defined in  claim 1 , comprising a pair of outer layers arranged on substantially all of the inner layer first and second major surfaces. 
     
     
         3 . A nonwoven abrasive as defined in  claim 2 , wherein the first layer comprises organic fibers and a polymer binder. 
     
     
         4 . A nonwoven abrasive as defined in  claim 3 , wherein the first layer comprises a plurality of nonwoven fabric sheets. 
     
     
         5 . A nonwoven abrasive as defined in  claim 4 , wherein the second layer further comprises a hardenable resin and a hardening agent. 
     
     
         6 . A nonwoven abrasive as defined in  claim 5 , wherein the first nonwoven material and the second nonwoven material are the same. 
     
     
         7 . A method of making a nonwoven abrasive disc comprising the steps of
 providing a plurality of sheets of circular nonwoven fabric;   stacking the nonwoven fabric sheets on a shaft;   arranging the stacked nonwoven fabric sheets in a retaining fixture;   compressing the stack of nonwoven fabric sheets thereby forming a compressed laminate.   
     
     
         8 . A method of grinding brazing material in a V-shaped groove between a pair of side walls, comprising the step of contacting the brazing material with a rotating nonwoven abrasive disc as defined in  claim 2 , wherein the inner layer contacts the brazing material, and the outer layer contacts the side walls.