| Flexible grinding product and method of producing the same -> Monitor Keywords |
|
|
  Flexible grinding product and method of producing the sameUSPTO Application #: 20060280908Title: Flexible grinding product and method of producing the same Abstract: The present invention relates to a flexible grinding product and a method of producing the same. Such a grinding product comprises a flexible underlay (1) which consists of two layers laminated to each other. These comprise a lower base layer (2) and an upper layer (3), a cavity layer. The underlay includes a top surface (5) having at least one adhesive layer (6) arranged thereto after lamination and a layer of grinding agent (7) applied by means of the adhesive layer. The grinding product is characterized in that the layer that is coated with grinding agent includes holes which form cavities (4), whereby the cavities provide space for grinding dust and grinding residues and facilitate their re-moval from the surface being ground. (end of abstract)
Agent: Altera Law Group, LLC - Minneapolis, MN, US Inventor: Goran Hoglund USPTO Applicaton #: 20060280908 - Class: 428143000 (USPTO) Related Patent Categories: Stock Material Or Miscellaneous Articles, Structurally Defined Web Or Sheet (e.g., Overall Dimension, Etc.), Continuous And Nonuniform Or Irregular Surface On Layer Or Component (e.g., Roofing, Etc.), Particulate Matter The Patent Description & Claims data below is from USPTO Patent Application 20060280908. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The invention relates to a flexible grinding product according to the preamble of independent claim 1. The invention further relates to a method of producing a similar grinding product according to the preamble of independent claim 15. [0002] Grinding product of this kind includes special recesses for removal of grinding dust from the grinding surface and for cooling the grinding surface. BACKGROUND OF THE INVENTION [0003] Production of discoid grinding products consisting of a flexible underlay, such as paper, is well known. One side of the underlay is provided at least with one adhesive layer, which includes an essentially continuous layer of grinding agent substantially applied thereto. [0004] To enable continuous maintenance of the grinding product's grinding effect, as much of the grinding dust released during grinding as possible must be removed from the space between the grinding product and the grinding surface of the object being ground. As the underlay of such grinding products has not conventionally been air and dust permeable, the grinding products have usually been provided with specific perforated openings, which extend through the grinding product and are connected to air ducts, for example, through which grinding dust can be sucked out while grinding continues. Such products are described in EP 0 781 629, for instance. [0005] These prior art grinding products are produced so that an otherwise finished grinding product is fed through an apparatus where the grinding product is provided with holes by perforation or another piercing process. However, this way of providing the grinding product with through-holes has several disadvantages. Perforation causes cracks and other undesired deformations at the edges of the holes, both in the underlay and in its adhesive layer. Due to crack formation and deformations, the material bridges between the holes must be made relatively wide because narrow material bridges can easily break. Consequently, the holes must be placed at a relatively long distance from one another, as a result of which the grinding product is not cleaned efficiently enough and its grinding effect decreases relatively fast during grinding. [0006] Such perforation also causes other disadvantages. Perforation of the underlay weakens the grinding product to such an extent that a continuous grinding belt cannot be formed of it. The reason for this is that perforation causes increased stretching in the underlay when it is subjected to stress. In addition, an edge perpendicular to the main plane of the grinding product is often formed at the hole edges of the underlay in the perforation process. This edge makes the removal of grinding dust through the holes of the grinding product more difficult. It is further generally known that the perforator wears fast during perforation because of the hard grinding agent. [0007] Most of the above-mentioned disadvantages can naturally be avoided by coating the underlay of the grinding product after it has been perforated, impregnated and coated with a sufficient number of adhesive layers as described in U.S. Pat. No. 2,838,890. The problem associated with this solution is that this grinding product cannot be used in producing a continuous grinding belt, or grinding belts made of perforated grinding products can only be produced from grinding products having a relatively thick underlay. The underlay must be thick so as avoid stretching of the grinding belt. However, the impregnation and coating of the underlay in accordance with the above-mentioned US publication makes the underlay brittle, which means that the grinding product can be bent only a little without breaking it. A grinding belt made of this grinding product would thus break easily in use. If the grinding belt is sufficiently elastic so that is does not break, there is the risk that the grinding belt is stretched too much by belt tension. [0008] Net-like grinding products with a cloth base provided with through-holes for dust removal have also been devised. Such a solution is described in WO 96/13358, for example. The problem associated with this solution is that the cloth requires a special production technique and its use is thus expensive. Also the processing and coating of the cloth require special methods. Furthermore, the finished product has the disadvantage that the cut and perforated edges are weakened by the holes that are on the cutting line since they form notches in the edge of the finished product. [0009] Finally, it may be mentioned that the problem arising in connection with the above-mentioned perforation of grinding products has been relieved by using as the underlay an open cloth or a net where most of the surface is air-permeable. Grinding products produced this way have, however, a poorer grinding capacity than the grinding products described earlier because a continuous and substantially even layer of grinding agent cannot be applied to a cloth or a net. The grinding agent layer will not be in a uniform main plane but will follow the uneven surface of the cloth or net in different planes. As the amount of grinding agent acting on the surface of the work piece is smaller per unit area compared to a case where the whole surface is coated with grinding agent, the grinding effect will decrease. Such a grinding product is described in Fl 96584, for example. BRIEF DESCRIPTION OF THE INVENTION [0010] The problems involved in prior art solutions can be substantially avoided by the present invention. The object of the invention is thus to provide a flexible grinding product which is easy to handle, has a high strength and a sufficient dust removal capacity. [0011] This object is achieved by the flexible grinding product and its production method characterized by what is stated in independent claims 1 and 15. Respective dependent claims describe suitable further embodiments and variants of the invention that improve its operation. [0012] The present description and the appended claims use the terms "pore" and "porosity" to refer to a channel structure that substantially goes through a material. This channel structure may be formed artificially or it may be a natural characteristic of the material. [0013] The term "grinding surface" means the surface of a work piece at which the effect of the grinding product is directed. [0014] The grinding product and the method of producing the same according to the invention provide several significant advantages over the prior art. It is thus not necessary to make perforations to an underlay already coated with grinding agent since the adhesive layer is applied to an underlay whose upper surface has already been provided with holes obtained by laminating a cavity layer to a base layer. This naturally simplifies the production of the grinding product as well as reduces the costs. The hole structure on the top surface of the underlay can also be achieved in a simple manner so that no cracks or edge is formed in the coating at the edges of the hole. As no cracks are formed, the holes on the upper surface can be arranged very close to one another and thus the material bridges between the holes can be narrow. This makes both the removal of grinding dust and cooling of the grinding surface more effective. [0015] A further substantial advantage provided by the invention is that the adhesive layer will extend as a substantially continuous layer from the top surface of the underlay to its hole structure and to the edge surfaces provided therein. [0016] Since the adhesive layer extends over the edge surface of the hole structure, the transitional area between the underlay's top surface and edge surface is uniform and smooth without any cracks or edges, which facilitates collection of grinding dust particles from the space between the top surface of the grinding product and the work piece to the grinding product. [0017] The adhesive layer will also strengthen the edge surfaces of the underlay as well as the bottom sections of the recesses which are formed from the hole structure since the adhesive layer, if desired, may also impregnate these surfaces. The adhesive layer can thus cover part of the edge surface or even the whole surface of the recesses. [0018] The grinding product can also be made very flexible by laminating two substantially unstretchable thin materials to each other. This way the grinding product can be used in producing continuous grinding belts, for instance. [0019] The dust transportation properties of the grinding product are better than those of competing products since the hole structure in the top surface of the underlay forms a temporary storage place or reservoir for dust and grinding residues during grinding. This way dust and grinding residues may be stored in holes and recesses while the grinding product is against the grinding surface. As soon as air flow can be generated at the grinding product, the collected dust or grinding residues can be transported further. [0020] The dust transportation properties can be improved further by forming the base layer of a porous material. Such material can be preferably used in the production of grinding products for oscillating grinding machines, for example, where the requirements for stretch resistance are not as high as in the case of a grinding belt. [0021] When the material of the base layer includes a fastening element or the lower side of the base layer is provided with fastening loops known per se, the grinding product can be easily applied to known grinding machines. Continue reading... Full patent description for Flexible grinding product and method of producing the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Flexible grinding product and method of producing the same 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 Flexible grinding product and method of producing the same or other areas of interest. ### Previous Patent Application: Adaptive membrane structure with insertable protrusions Next Patent Application: Novel mineral composition Industry Class: Stock material or miscellaneous articles ### FreshPatents.com Support Thank you for viewing the Flexible grinding product and method of producing the same patent info. IP-related news and info Results in 1.1612 seconds Other interesting Feshpatents.com categories: Accenture , Agouron Pharmaceuticals , Amgen , AT&T , Bausch & Lomb , Callaway Golf |
||
