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  Non-loading abrasive articleUSPTO Application #: 20060019579Title: Non-loading abrasive article Abstract: An abrasive article and methods of making and using the same are disclosed. The abrasive article includes a particle impermeable back-up pad attached to an abrasive disc. The abrasive disc includes a plurality of perforations therethrough. When the abrasive article is moved and contacted against a workpiece, debris from the workpiece is captured between the back-up pad and workpiece. (end of abstract) Agent: 3m Innovative Properties Company - St. Paul, MN, US Inventors: Ehrich J. Braunschweig, Edward J. Woo, Ian R. Owen, Thomas W. Rambosek USPTO Applicaton #: 20060019579 - Class: 451028000 (USPTO) Related Patent Categories: Abrading, Abrading Process The Patent Description & Claims data below is from USPTO Patent Application 20060019579. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD [0001] The present disclosure relates generally to abrasive articles, and more particularly to back-up pad/abrasive disc combinations. BACKGROUND [0002] Back-up pads are used in the abrasives field to support an abrasive article, such as a disc or sheet during abrading. These abrasive articles can be in various forms, such as a disc, a sheet, or a polygon and, may optionally, contain holes or slits to aid in dust extraction. The back-up pad includes a generally planar major surface, to which the abrasive article, such as a disc or sheet, may be attached. Although back-up pads may be hand held, back-up pads are more commonly used in conjunction with a powered abrading apparatus such as electric or pneumatic sanders. [0003] Abrasive discs and sheets (hereinafter collectively "discs") may be attached to a back-up pad in various ways. One attachment method includes an abrasive disc having pressure sensitive adhesive (PSA) on one surface thereof, such that the abrasive disc may be adhered to the major surface of the back-up pad. The major surface of the back-up pad may have, for example, a smooth foam, vinyl, or cloth surface to facilitate attachment of the abrasive disc. An example of such a back-up pad is available from 3M Company of St. Paul, Minn., under the designation "STIKIT" brand back-up pad. An example of an abrasive disc for attachment to that back-up pad is available from the same company under the designation "STIKIT" brand abrasive disc. [0004] A second type of back-up pad includes a major surface having a plurality of hooks projecting therefrom. The hooks are adapted to engage certain structures provided on the back face of an abrasive disc to releasably attach the disc to the back-up pad. An example of such a back-up pad is available from the 3M Company of St. Paul, Minn., under the designation "HOOKIT" brand back-up pad, and an example of an abrasive disc for attachment to that back-up pad is available from the same company under the designation "HOOKIT" brand abrasive disc. Alternatively, the back-up pad major surface can include engaging structures to cooperate with hooks on an abrasive disc. An example of such an assembly is available from 3M Company under the designation "HOOKIT II" brand back-up pad and abrasive disc. SUMMARY BRIEF DESCRIPTION OF THE DRAWING [0005] The present disclosure will be further explained with reference to the appended Figures, wherein like structures are referred to by like numerals throughout the several views, and wherein: [0006] FIG. 1 is a section view of an example embodiment of a back-up pad and abrasive disc combination according to the present disclosure; [0007] FIG. 2 is an example embodiment of a disc according to the present disclosure; [0008] FIG. 3 is example embodiment of a disc according to the present disclosure; [0009] FIG. 4 an example embodiment of a disc according to the present disclosure; [0010] FIG. 5 an example embodiment of a disc according to the present disclosure; [0011] FIG. 6 an example embodiment of a disc according to the present disclosure [0012] FIG. 7 an example embodiment of a disc according to the present disclosure; and [0013] FIG. 8 an example embodiment of a disc according to the present disclosure. DETAILED DESCRIPTION [0014] Generally, the invention of the present disclosure is directed to an abrasive article including a back-up pad removably attached to an abrasive disc. Within the context of this disclosure, removably attached means that the disc is secured to the back-up such that it will not detach during an abrading operation, but can be removed from the back-up pad via manual means, e.g., taken off by hand. The abrasive disc includes a plurality of perforations or holes therethrough for allowing passage of debris (swarf, dust, particles, metal, etc.) from a workpiece into the area or volume between the back-up pad and the abrasive disc. [0015] FIG. 1 illustrates an exemplary article 105 including back-up pad 110 with an abrasive article 130 attached thereto. Abrasive layer 111 of article 130 comprises a plurality of abrasive particles 120 attached to a flexible backing 112 by adhesive coating 121. The backing 112 has a front side 113 and a backside 114. Attachment layer 115 is provided as a pressure sensitive adhesive layer (PSA) to releasably attach the abrasive article 130 (layers 111 and 112) to the facing layer 116 provided on the front surface 117 of molded foam layer 118. Foam layer 118, on its rear surface 119, is attached to a rigid metal backing plate 122. A threaded stud 123 is fixed in a known manner to the back side of the rigid backing plate 122 to allow attachment of the back-up pad 110 to a suitable tool or drive means (not shown) capable of, for example, rotatably driving the pad 110 and the article 130 around the longitudinal axis of threaded stud 123. The back-up pad 110 is substantially impermeable to matter that is removed during the abrading process. [0016] Various perforation (interchangeably, also holes) configurations in the abrasive disc can be used with the particle impermeable back up pad. FIG. 2 illustrates a 5-hole disc 230, which is typically 3-8 inches (76.2-203.2 mm) in diameter. The holes 250 are spaced-regularly around the disc 230, at about 72 degree intervals. Such discs are available under the trade designation "DUST-FREE SANDING DISCS--5 HOLE," from 3M Company, St. Paul, Minn. FIG. 2 illustrates an 8-hole disc 330, which is typically 3-8 inches (76.2-203.2 mm) in diameter. The holes 350 are spaced-regularly around the disc 330, at about 45 degree intervals. Such discs are available under the trade designation "DUST-FREE SANDING DISCS--8 HOLE," from 3M Company, St. Paul, Minn. [0017] While the above-described discs include circular holes (or perforations), other shapes can be used, either singly or in combination. Referring to FIG. 4, an exemplary disc 420 includes alternating rectangular shaped perforations 452 arranged regularly around the disc 420. Triangular perforations 452 are placed between the rectangular perforations near the periphery of the disc 420. [0018] FIG. 5 illustrates an 8-perforation disc 520, which is typically 3-8 inches (76.2-203.2 mm) in diameter. The perforations 550 are spaced-regularly around the disc 520, at about 45-degree intervals. The perforations 550 have an end 551 near the periphery of the disc 520 and extend inwardly along a diameter of the disc 520 to a second end 553 near the center of the disc 520. [0019] FIG. 6 illustrates an 8-perforation disc 630, which is typically 3-8 inches (76.2-203.2 mm) in diameter. The perforations 650, 652 are spaced-regularly around the disc 630. The perforations 650, 652 are arcuate and have a circularly-shaped end 651, 653 near the periphery of the disc 630 and extend inwardly to a second cusp-shaped end 655, 657 near the center of the disc 630. Continue reading... Full patent description for Non-loading abrasive article Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Non-loading abrasive article patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Non-loading abrasive article or other areas of interest. ### Previous Patent Application: Machining device Next Patent Application: Apparatus for removing material, use of gas inclusions in an abrasive liquid and process for grinding and/or polishing surfaces Industry Class: Abrading ### FreshPatents.com Support Thank you for viewing the Non-loading abrasive article patent info. 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