An abrasive sheet or polishing sheet containing an abrasive layer divided into discrete blocks by a network of grooves. The polishing sheet is prepared by making a slurry of abrasive particles and a resin adhesive agent of low density and viscosity, spreading it on a base and heating the resulting sheet from below the base.
A method of producing an abrasive backing or a polishing sheet material which has a nonwoven fabric of a synthetic fiber having a network structure and impregnated with a polyurethane solution. The method has the steps of completely coagulating and drying the polyurethane solution to prepare a base material, removing a skin layer from each surface thereof, dipping the resultant base material in an aqueous solution of a solvent for a short period of time, and treating it in a high-temperature atmosphere for a short period of time.
A cleaning device for the heads of a Personal Computer is in the form of a diskette insertable in a disk drive of the computer. The diskette is provided with a pair of superimposed abrasive disks each of which rubs against one head of the computer when the diskette is in the disk drive and the latter is activated.
A single-layer polishing pad is grooved in a pattern having relatively large turn radius bends (i.e., greater than the 90.degree. bends of conventional rectangular grid grooving) to improve stability. The large radius bends allow slurry to be more easily and uniformly distributed across the surface of the polishing pad than conventional rectangular grooving. This improvement in slurry distribution tends to improve RR uniformity and WIWNU. In one embodiment, the polishing pad is grooved in a hexagonal pattern, which produces a grooving pattern with 120.degree. bends. The grooves do not penetrate all of the way through the upper layer, thereby maintaining the "stiffness" of the polishing pad, which tends to improve planarization. When used in conjunction with standard pad conditioning techniques, polishing pads with groove patterns having large radius bends has yielded startling and unexpected improvement in stability. The improved fluid distribution provided by the groove pattern is believed to allow the pad conditioning process to clean the polishing pad of residual slurry, polishing debris and polishing by-products more thoroughly than polishing pads with conventional rectangular groove patterns.
A surface treating tape has a sheet-like backing covered with closely spaced protuberances which are coated with an abrasive layer which contains premium abrasive particles. The surface finishing tape is useful for finishing magnetic disks and other substrates to provide a percision finish.
A surface treating tape has a sheet-like backing covered with closely spaced protuberances which are coated with an abrasive layer which contains premium abrasive particles. The surface finishing tape is useful for finishing magnetic disks and other substrates to provide a precision finish.
