Patent ID: 6761746
Filing Date: 2004-07-13
Classification: B24D

Abstract:
A method for forming a sanding disc, said method comprising the steps of:providing a polymeric foam disc of resiliently compressible foam, the foam disc having an axis, opposite axially spaced major surfaces, a predetermined diameter, and a peripheral surface about the axis extending between the major surfaces; providing an abrasive disc having an axis, opposite first and second axially spaced generally planar major surfaces, a peripheral surface about the axis between the major surfaces, and a diameter larger than the diameter of the foam disc, the abrasive disc comprising a layer of backing material having opposite major surfaces, a layer of abrasive material, and a layer of resin adhering the layer of abrasive material along one of the major surface of the layer of backing material with the layer of abrasive material defining the first major surface of the abrasive disc; providing a sheet of hot melt adhesive; positioning the sheet of hot melt adhesive between the second major surface of the abrasive disc and one major surface of the foam disc with the discs being coaxial; heating and pressing together the positioned abrasive disc, sheet of hot melt adhesive and foam disc to soften and cause the sheet of hot melt adhesive to adhere the abrasive and foam discs together when the sanding disc cools; heating an annular peripheral portion of the abrasive disc extending from a planar central portion of the abrasive disc to the peripheral surface of the abrasive disc; and reshaping the heated annular peripheral portion of the abrasive disc so that when the abrasive disc cools the portion of the first major surface defined by the layer of abrasive along that annular peripheral portion of the abrasive disc is generally cylindrically convex with the portion of the first major surface along the circular planar central portion being generally tangent to the adjacent part of the first major surface along the annular peripheral portion.