Abrasive disc

Abstract

To provide an abrasive disc which has a small size in the thickness direction and, therefore, can grind objects easily even if they are narrow portions or side walls of grooves and which has a strength enough for resisting the force applied during grinding. Means for Solution An abrasive disc which comprises a disc-shaped laminate comprising a layer of a nonwoven abrasive material, a layer of a reinforcing fabric connected to one side of the layer of the nonwoven abrasive material, a central opening, an almost flat front surface and an almost flat back surface; and a grinder-mounting resin portion, the grinder-mounting resin portion being formed integrally with the disc-shaped laminate by insert-molding a resin at the peripheral portion of the central opening in the disc-shaped laminate.

1 . An abrasive disc which comprises:
 a disc-shaped laminate [ 1 ] comprising a layer of a nonwoven abrasive material [ 3 ], a layer of a reinforcing fabric [ 4 ] connected to one side of the layer of the nonwoven abrasive material, a central opening [ 5 ], an almost flat front surface and an almost flat back surface; and   a grinder-mounting resin portion [ 2 ], the grinder-mounting resin portion being formed integrally with the disc-shaped laminate [ 1 ] by insert-molding a resin at the peripheral portion of the central opening in the disc-shaped laminate [ 1 ].   
     
     
         2 . An abrasive disc which comprises two abrasive discs according to  claim 1 , wherein these abrasive discs are laminated and connected together back-to-back. 
     
     
         3 . The abrasive disc according to  claim 1 , wherein in the outer peripheral portion of the grinder-mounting resin portion [ 2 ], the grinder-mounting resin portion and the disc-shaped laminate has been connected through penetration of the resin of the grinder-mounting resin portion [ 2 ] into interstitial spaces between constituent fibers of the disc-shaped laminate and solidification of the resin during the insert-molding. 
     
     
         4 . The abrasive disc according to  claim 1 , wherein the grinder-mounting resin portion [ 2 ] has a grinder-mounting hole [ 6 ] and the inner peripheral wall of the grinder-mounting hole has screw threads so as to function as a nut. 
     
     
         5 . The abrasive disc according to  claim 1 , wherein the disc-shaped laminate [ 1 ] is one in which the reinforcing fabric [ 4 ] and the nonwoven abrasive material have been connected by applying a resin liquid from an exposed surface of the reinforcing fabric [ 4 ], making the resin liquid permeate the reinforcing fabric [ 4 ] and the nonwoven abrasive material [ 3 ], and then solidifying the resin liquid.