Sheet-form abrasive with dimples or perforations

Abstract

A sheet-form abrasive material having a substrate ( 11 ), a binder ( 12 ) coated on a surface of the substrate, and abrasive grains bonded to the substrate by the binder, wherein the abrasive material has a plurality of dimples or perforations ( 14 ), each having a mutually independent shape that are placed over an entire abrasive surface, and an effective contact area to an object to be abraded of 50% to 96%.

What is claimed is:  
     
         1 . A sheet-form abrasive material comprising: a substrate; a binder coated on a surface of the substrate; and abrasive grains bonded to the substrate by the binder forming an abrasive surface; wherein the abrasive material has a plurality of dimples or perforations distributed over the entire abrasive surface, each of said dimples or perforations having a mutually independent shape, wherein the abrasive material has an effective contact area to an object to be abraded of about 50% to about 96%.  
     
     
         2 . The abrasive material according to  claim 1 , wherein said dimples or perforations have a round shape having a diameter of 0.5 mm to 10 mm.  
     
     
         3 . The abrasive material according to  claim 1 , wherein said dimples or perforations have a round shape having a diameter of 2 mm to 6 mm.  
     
     
         4 . The abrasive material according to  claim 1 , wherein said dimples or perforations have a square shape having a side length of 0.2 mm to 10 mm.  
     
     
         5 . The abrasive material according to  claim 1 , wherein said dimples or perforation have a square shape having a side length of 2 mm to 6 mm.  
     
     
         6 . The abrasive material according to  claim 1 , wherein each of said dimples or perforations has a chamfered edge.  
     
     
         7 . The abrasive material according to  claim 1 , wherein said abrasive material has a plurality of dimples.  
     
     
         8 . The abrasive material according to  claim 1 , wherein said abrasive material has a plurality of perforations.  
     
     
         9 . The abrasive material according to  claim 1 , wherein said abrasive material has an effective contact area ranging from about 75% to about 90%.  
     
     
         10 . The abrasive material according to  claim 1 , wherein said abrasive material has an effective contact area ranging from about 80% to about 85%.  
     
     
         11 . The abrasive material according to  claim 1 , wherein said dimples or perforations have a diameter ranging from 2% to 8% of an outer diameter of the abrasive material.  
     
     
         12 . The abrasive material according to  claim 1 , wherein said abrasive grains are substantially in the form of a single layer.  
     
     
         13 . The abrasive material according to  claim 1 , wherein said abrasive grains are applied using an electrostatic spay coating method.  
     
     
         14 . The abrasive material according to  claim 1 , wherein said abrasive material is attached to a manual abrasion block or a sander.