MXPA98000994A - Method for manufacturing an abrasive band covered by empa - Google Patents

Abstract

A method for making a flexible coated abrasive web comprising the steps of: mounting a splice backing substrate substrate having an exposed front surface tensioned on a peripheral surface of the temporary support structure, applying a continuous fibrous reinforcement material thereon; front surface at a plurality of revolutions, applying a cover of a first binder precursor on said front surface, exposing said layer for effective conditions for solidifying said first binder precursor and attaching said fibrous reinforced material to said front surface to form an endless reinforced backing, and applying an abrasive coating comprised of abrasive particles and adhesive on said elaborate surface or said front surface of said reinforced sympathetic backing.

Description

METHOD FOR MANUFACTURING AN ABRASIVE BAND WITHOUT SPLICE Background of the Invention 1. Field of the Invention The present invention relates to a method for the manufacture of a non-spliced coated abrasive web, a continuous elongate fibrous material and the product of the same method. 2. Related Technique Generally a coated abrasive article contains an abrasive material, typically in the form of abrasive granules, attached to a backing by means of one or more adhesive layers. Such articles usually take the form of substrates, discs, belts, bands and the like, which can be adapted to be mounted as pulleys, wheels or drums. Such abrasive articles can be used for sanding, grinding or polishing various surfaces, for example, steel and other metals, wood, sheet products.

REF .: 26742 similar to wood, plastic, fiberglass, leather or ceramic products. The backs used in coated abrasive articles are typically made of paper, polymeric materials, fabric, non-woven materials, vulcanized fibers or combinations of these materials. Many of these materials also provide unacceptable backings for certain applications because they are not strong enough, flexible or impact resistant. As a result, the first failures and poor functionality can occur, at least in certain applications of these backing materials in a non-reinforced state. In a typical manufacturing process, a coated abrasive article includes the backing and the abrasive coating, inter alia, is manufactured in a continuous mesh form and thereafter becomes a desired construction, such as a substrate, disc, belt or similar. One of the most common constructions of a coated abrasive article is an endless coated abrasive belt, that is, a continuous gauze of the coated abrasive material. In order to form such an endless band, the shape of the fabric is typically cut into strips along a desired length and width. The ends of the elongated strips of the substrate made of the coated abrasive article are attached at the same time to create a "joint" or a "splice". These are two common ways to join the free ends of an elongated strip to make an endless band without splicing. These are respectively referred to as an "overlap" splice or a "stop" junction. In an "overlap" splice, the two free ends of the elongate band are respectively bevelled to have an upper end and a lower end that can be superimposed to form a joint without causing a significant change in the total thickness of the band. The beveling on which the lower end is placed is typically accomplished by removing abrasive grains and material from the surface of one end of the strip and removing part of the material from the backing or from the underside of the other end of the strip to provide which becomes the upper end. The bevelled ends are then overlapped and adhesively or mechanically bonded. For the "stop" connection, the two free joining ends of the elongated strip are carried in a juxtaposition relationship in a linear connection. The lower surface of the backing of each end of the elongated strip, such as a substrate made of a coated abrasive article, is typically then coated with an adhesive, mechanically secured or otherwise overlapped with a thin, tear-resistant bonding means. , strong in the area of union. The overlap and the butt joint still provide a satisfactory belt for any application, any may be undesirable for other applications because these typically produce a discontinuity in the coated abrasive layer and other surfaces, ie the abrasive coated surface of the site of splicing. This type of joint is generally exemplified in the US patents Nos. 2, 391,731 (Miller), 3,333,372 (Gianatsio) and 4,736,549 (Toillie). A discontinuity in an abrasive coating can cause an undesirable mark on the surface of a finished workpiece. These marks are others referred to as "vibration". Other background in the art includes: U.S. Patent No. 289,879 (Al ond) discloses a polishing tool comprising abrasive grains adhered to a tubular backing.

U.S. Patent No. 2,012,356 (Ellis) discloses an abrasive coating having a seamless fabric tubular backing. U.S. Patent No. 2,404,207 (Ball) pertains to a seamless coated abrasive article having a nonwoven fiber backing. The non-woven fiber backing can be saturated with an adhesive and contains other reinforced fibers. U.S. Patent No. 2,411,724 (Hill) discloses a method for making an endless tubular coated abrasive, in which a thermoplastic or thermosetting adhesive is extruded to form a backing, in which the abrasive grains are integrated while the backing is molded. In another embodiment of this invention, the backing may comprise a coating for reinforcing the strands over which they are covered with the thermoplastic adhesive. French Patent Application Publication No. 2,396,625 published February 2, 1979 teaches a seamless endless coated abrasive web, which is made of continuous fabrics of a cloth backing. These references also describe a non-spliced backing having a sinusoidal splice.

French Patent Publication No. 2,095,185 published November 2, 1972 (Ponthelet) discloses an abrasive product having a non-woven backing which can be reinforced with filaments placed in any transverse direction, longitudinal direction or as a grid. Where the filaments are placed in only one direction, the aforementioned filaments are held in a parallel arrangement to hold them down with a veil made of natural, artificial or synthetic fibers. The published PCT patent application No. WO 93/12911 (Benedict et al.) Published July 8, 1993 and contained by the following assignee, pertains to a method for manufacturing a splice-free coated abrasive belt having a backing that includes between about 40% to 99% by weight of an organic polymeric binder and an effective amount of a submerged fibrous reinforced material within the organic polymeric binder material. This reference describes preparing a gauze of liquid binder material having fibrous reinforcement material within the perimeter of the drum or cylinder and then solidifying the binder material to form the splices of the endless belt.

In many abrasive applications, they are desirable for use in endless coated abrasive webs having a backing with certain desired physical properties. These properties include low relative stretch, a high tensile stretch relative value and a high relative adhesion between the backing and the abrasive coating. Although Benedict et al. Represented significant progress in the technique of making coated abrasive bands, their alternating quest continues to improve the physical properties of the backing. PCT published patent application No. WO 95/00294 published January 5, 1995 (Schneider et al.) And owned by the present assignee corresponds to a method of making a band without endless splice. An organic material that can flow is molded by spin to form an organic, endless, uncured gauze material. The abrasive particles are thus inserted into the mold by rotation, in which the fabric is submerged in the organic material which is then solidified to form an abrasive band without splicing, endless. U.S. Patent 2,349,365 (Martin et al.) Involves a flexible coated abrasive article in which the backing comprises a substrate of the plastic material reinforced with a cloth or paper substrate. PCT published patent application No. WO 86/02306 published on April 24, 1986 (Hansen et al.) Belongs to an improved coated abrasive backing having a flexible substrate and a multiplicity of free weft, closely spaced, resistance to stretching, longitudinal alignment, coplanar, reinforced threads of continuous filaments attached to a flexible substrate surface before the backing is fired with an endless band. Each filament of the plurality of threads have ends that are joined to provide the backing substrate, providing a discontinuity and probably a weak area in the backing. The US application USSN 08 / 199,835 (Christianson et al.) Filed on February 22, 1994 and assigned by the present assignment, pertains to a spliced, endless abrasive backing having reinforced fibers. PCT published patent application No. WO 93/02837 (Ludeke et al.) Published on February 18, 1993 and assigned by the present assignment shows the preparation and arrangement of the coated abrasive web. The US application USSN 08 / 199,679 (Benedict et al.) Filed on February 22, 1994 and assigned by the present assignment, shows a method for manufacturing an endless reinforced abrasive article comprising a sheet substrate, reinforced fibrous material and a binder. which joins the fibrous material to the substrate that also doubles as a cover to adhere abrasive grains to the substrate. The users of the spliced coated abrasive webs continue on a strong, more durable search for the coated abrasive webs which are substantially free of uneven surfaces and / or thicknesses.

Summary of the Invention The present invention pertains to a method for manufacturing a splice-free coated abrasive web having a reinforced backing gauze substrate for a strand or strip of fibrous material and the product of this method.

In one embodiment, the invention pertains to a method of manufacturing a flexible coated abrasive strip comprising the steps of: (a) mounting a backing gauze substrate without endless splice having an exposed front surface and a back surface tensioned onto a surface peripheral of a temporary sleep structure; (b) applying a continuous fiber reinforced material on said front surface in a plurality of revolutions; (c) applying a cover of a first binder precursor on the front surface; (d) exposing said cover for effective conditions to solidify said binder precursor and joining said fibrous reinforced material to said front surface to form a reinforced back without splicing; and (e) applying an abrasive cover comprising abrasive particles and an adhesive on said back surface or on said front surface of said reinforced backing without endless splice. The various steps shown in the method described above do not need to follow sequences shown. It is to be understood that the request for the abrasive cover for a surface of the backing substrate may precede the step of applying a cover of fibrous reinforced material on the opposite surface of the backing substrate. Also, the step of applying the abrasive coating can be achieved by the application of a preformed abrasive coating which is formed in situ on any of the reinforced layers or the exposed surfaces of the backing substrate, or the abrasive coating can be applied with lamination, a preform thereof on any of such surfaces. It is also within the scope of the invention to apply the binder precursor for the above fibrous reinforcing material, concurrent with, or after application of the fibrous reinforced material to a surface of the substrate. Furthermore, it is within the scope of the invention to use more than a binder precursor to apply the fibrous reinforced material to the backing substrate, such as applying the binder to the fibrous reinforced material and the surface of the backing substrate connected thereto. Further, within the scope of this invention to apply several layers of fibrous reinforced material to the non-spliced backing substrate. These layers can be formed from the same or different reinforced materials. Additionally, an individual reinforced layer may comprise several different reinforcing materials. For purposes of this invention, the term "endless, non-spliced" in the description of the backing substrate means that the backing substrate uses in the bands that do not have free ends along its length direction, ie it is a gaza closed. The backing gauze substrate without splicing, endless is preferably formed after installation on the support structure. For purposes of this invention, the fibrous reinforced material is applied to the backing gauze substrate without splicing in a "continuous" manner in the sense that it is constituted by at least one individual fibrous strand or the narrow fibrous strip wound or coiled around of the backing gauze substrate without splice, endless more than a complete revolution of the fibrous reinforced material along the length of the full machine direction of the gauze. The coated abrasive belt of the present invention is characterized in that it has one or more of the following of the following improvised properties. The seamless, endless gauze substrate provides a backing that is free of any of the high areas or splice marks. The reinforcement of the fibers of the abrasive strips endows the abrasive strips of the invention with a greater resistance to stretching and an increase in the tension force and to improve the useful life. Obviously, the current magnitude of improvement of these properties will depend in large part on the particular selection of the raw materials used to manufacture the abrasive web, this selection is within the capacity of a person skilled in the art who knows the present description. The method of the invention, in one embodiment, also provides a reinforced endless fiber backing, without splice that can be continuously coated with an abrasive coating along a surface thereof.; in this way the formation of discontinuity in the coated abrasive surface is prevented. The reinforced fiber layer of the invention may be substantially completely surrounded (i.e., immersed within) the organic polymeric binder material. A reinforced layer is characterized by the presence of reinforced fibers adjacent to the front surface of the substrate surface to which it is attached and the absence of reinforced fibers adjacent to its exposed surface. This provides an evenly exposed exposed surface of the backing without any protrusion of the fibrous reinforced material. In addition, the topological surface is preferably prepared so that it is free of any undulation that reflects the irregularities of the surface of the fibrous reinforced material. Alternatively, the reinforced material may be wound with a wetting amount but not necessarily a wrap of resin in an amount sufficient to immobilize the fiber in place of the backing substrate after it is dried or cured. In a further specific embodiment of the method of the invention, the application of the reinforced fiber to the non-spliced backing gauze substrate provides a space of approximately 2-50 threads per cm of lateral width of the non-spliced backing gauze substrate. An abrasive layer is applied to the surface of the reinforced backing loop described above to prepare an abrasive belt. The abrasive web is typically applied to the bottom surface of the backing gauze, that is, to the opposite surface of the fiber strength, but the abrasive layer can also be applied to the backing surface. Conventional techniques are used to apply or create the abrasive layer. In a preferred embodiment of the coated abrasive web of the invention, abrasive particles are included in the second layer of binder precursor coated on the backing surface on which the abrasive layer is applied. This coating is typically called a made coating. The abrasive particles are applied to the coating of the second precursor layer by a coating technique selected from the group consisting of electrostatic coating, drip coating and magnetic coating. The above method of manufacturing the abrasive coating, further typically includes the step of applying a third layer of binder precursor, as a layer of the so-called size, to the included abrasive particles and then the binder precursor layers solidify. In a particular embodiment of the aforementioned method, the method of applying the fibrous reinforced material comprises wrapping an individual fibrous reinforced strand or narrow fibrous strip as a continuous element of the backing gauze substrate without splicing around the periphery of the front surface of the substrate. of backing in the form of a helix extending longitudinally to the shape of the fibrous reinforced layer in a manner that covers substantially the full lateral width of the aforesaid front surface, and preferably completely covers the width thereof. The wrapped fibrous strands or narrow strips can be applied as a spiral wrapped side by side along the length of the surface of the backing substrate with their side edges closed in close proximity to provide a substantially continuous layer. This spiral wrapped of the reinforced strands or strips on the non-spliced backrest forming increased resistance and decreased stretch of the backrest. The strand material may comprise any of a number of different types of non-metallic or metallic fibrous material, such as glass, steel, carbon, ceramics, wood, silk, cotton, polyvinyl alcohol, polyamide, polyester, rayon, acrylic, polypropylene , aramid and polyethylenes of lightweight and ultra-light molecular weight. In a preferred embodiment of the method of the invention, the manner of applying the fibrous reinforced material comprises separately wrapping each one of a first individually reinforced strand and a second individual reinforced strand in a backing gauze substrate without splicing on the front surface of the non-spliced backing gauze substrate, endless in the longitudinally extending helix shape to form the fibrous reinforced layer which substantially completely covers the lateral width of the front surface of the endless backing substrate. Alternatively, the first and second strands of individual reinforced fiber can be wound simultaneously. The selection of different types of rolled fibrous strands can be used to provide a balanced improvement of physical properties. For example, in a combination of glass and fibrous polyamide strands, the glass strands give low strength properties while the polyamide strands offer resistance to the fibrous reinforced layers. As another example, a combination of aramid and polyester strands provide a balance of strength / low stretch and resilience, respectively, in the fibrous reinforced layer. The reinforced fibrous material may also be a narrow fibrous strip, such as a woven strip or woven fabric, non-woven mesh or tow, having a side width less than the lateral width of the backing substrate to allow helical winding thereof. In addition, the reinforced fiber can be applied in separate sub-assemblies in the lateral width of the non-spliced backing gauze substrate. For example, continuous reinforced fibers can be wound on multiple side-side windings of the backing gauze substrate without splicing and / or on top of a central area space from the side edge thereof. In a further embodiment of the invention, the backing gauze substrate without splicing, sinfin is particularly selected from the group consisting of a polymer film (includes a printed polymer film), a woven cloth, a knitted fabric, paper, a fibrous substrate vulcanized, nonwoven, including various combinations and treated thereof. For example, in a preferred embodiment, the backing gauze substrate without splicing, endless to be a fabric structure, such as a reticulated or woven fabric. In a further embodiment of the invention, the temporary support structure is a cylindrical surface. For example, a drum that is rotated about its central axis by a motor drive and a drum having an extendable and / or collapsible periphery is preferred to allow adjustment of its circumference to fit and correspond to the particular length of the gauze substrate. backup without splicing. Similar methods can also be used to prepare a coated abrasive band using a support structure, such as a conveyor system. Such a typical system would have been used, for example, a stainless steel sleeve in the form of a conveyor belt. In this embodiment, the step of preparing a backing without fibrous reinforced splice includes preparing the backing around the conveyor belt. Other constructions, modalities and characteristics of the invention will become apparent from the following description and preferred embodiments.

Brief Description of the Drawings Figure 1 is a perspective view of an elongated fragment of a coated abrasive backing, made by the method of the invention showing surfaces of detailed edges in cross section. Figure 2 is a fragmentary cross-sectional view through an article. coated abrasive, made by the method of the invention.

Figure 3 is a perspective view of the main elements (without showing the support structure) of an apparatus for practicing a preferred process for making a reinforced, spliceless, endless backing structure according to the present invention.

Detailed description of the invention Detailed descriptions of the present invention are provided herein. In addition, the invention does not limit the specific formulations, arrangements and methods identified and described, except as limited by the claims. Referring to Figure 1, backing without splicing, endless 10 is made by the method of the invention. In Figure 1, the backing 10 comprises a spliceless, endless backing gauze substrate 11 which is adhesively bonded to a fibrous reinforced layer 14 comprising reinforced fiber 15 which is saturated with binder 16. The binder 16 adheres the fibers 15 within the fibrous reinforced layer 14 and the substrate backing 11. Abrasive particles are then adhered by methods, such as those described therein, to at least one of the exposed surfaces, a front surface 17 or back surface 18 or backing 10, or any of the sides of the fibers 15 or backing gauze substrate without splicing 11. The binder 16 is applied to the fibers 15 in a liquid or flow and solidified state, then the fibers 15 are applied to the substrate of backup 11 by techniques described in more detail below. Alternatively, the binder 16 can be applied to the backing substrate 11 and then the fibers 15 are applied on top of the binder 16. In this, the term "liquid" refers to a material that is either flowable or flowing, while the "Solid" or "solidified" term refers to a material that is effortlessly flowed under ambient temperatures and pressures. Referring to Figure 2, the coated abrasive article, of which a segment is shown, comprises a backing 20 having a backing gauze substrate without splice, endless 21. In this embodiment, the reinforced fibers 25 which are saturated with a binder 26 placed adjacent to the backing substrate 21. On top of the reinforced fiber 25, an elaborate cover 27 is first applied, then the abrasive particles 28 are integrated therein. A measured cover 29 is then applied on the abrasive particles 28. Figure 2 paints the abrasive coatings on the back side having the reinforced fibers; although it can be understood that the abrasive coating is alternative, and preferably, it can be provided on the side of the backing substrate 21 opposite the reinforced fibers. The length, width and thickness of the reinforced backrest can vary in dimensions dependent on the final intentional use. For example, the length of the coated abrasive web (measured over the periphery of the web) can be any desired length, although typically the length is about 40-1000 centimeters (cm). The thicknesses of the spliced, endless reinforced backings 10 include splice-free backed gauze substrate 11 and reinforced fiber layers 14, are typically between about 0.07 millimeters (mm) and about 1 cm for optimum flexibility, length and preservation material. In addition, the reinforced thicknesses or backings 10 are preferably consistent and uniform, that is, they should not vary by more than about ± 15% around the full length of the backing 10., preferably not greater than about ± 5%. Although these variations refer to a variant length the thickness of the backrest 10, this is generally reflected in the coated abrasive material, i.e., the coated abrasive band. A preferred method for ensuring minimum variation of the backing material is to scrape or lightly grind the exposed surface of the binder layer 16 to provide a smooth planar surface, to remove any high spots that may eventually tend to reflect as imperfections in the backing. final coated abrasive product. Preferably, care must be taken not to grind so deeply as to weaken or damage the reinforced fibers or to remove too much of the binder material or the rest of the length of the backing may be affected. Another aspect of the invention will become more apparent from the following detailed description of the method of the invention.

In this regard, Figure 3 illustrates key components of an apparatus used in the process for manufacturing a coated abrasive backing according to the method of the invention. The reinforced fibrous backing of the invention is made on an apparatus 30. A backing gauze substrate without splice, endless 31 is applied to a temporary support structure 36, having a cylindrical surface corresponding to the circumference of the desired reinforced backrest. Typically, the circumference of the temporary support structure 36 (e.g., a drum 36) is between about 25-350 cm, and the width is between about 15-100 cm. The reinforced material, in this case in the form 37, leaves a winding station 38 and is moistened with a liquid binder precursor material to a level wrapping station 39. These saturated fibers are applied to the backing gauze substrate without splicing 31. The winding or winding process involves the use of a thread guide system 40 with the level reel 39. In this method, the winder 36 is rotatable (typically 25-75 rpm) while the reinforced fiber 37 is initially attached to the non-spliced backing gauze substrate 31 (i.e. the backing substrate 31) by fitting to the drum 36 and is pulled through the level furler 39, and wound around the drum 36 helically or spirally across the width of the drum, such that the applied layer of the thread 41, at the winding end, is no wider than the backing substrate 31. It is preferred that the winder 39 of drum-width movement level such that the continuous reinforced fibers 37 are uniformly applied in one layer across the width of the substrate 31 without splicing. In this manner, the fiber 37 is wound in a helical pattern of a plurality of loops in a layer within the organic polymeric binder material, with each loop of the strand parallel to the anterior loop of the strand. In addition, the individual gauzes of the fiber 37 are at a non-zero angle constant relative to the edge of the parallel side of the backing substrate 31. The reinforced fibers are wound onto the backing substrate 31 without splicing with a spacing of about 2- 50 strands per cm of width; although this may comprise an extensive range of spaced threads are contemplated within the invention. The selected space may depend on a number of variables, such as the strand material (s), the reinforced strength needed for a function of the type of backing material selected, and the type of intended service for the coated abrasive articles among others. It is possible that several strands can be used to cover the full width of the fabric backing in the event that the strands are long enough to rotate more than one gauze around the circumference of the cloth backing, but it is not long enough to traverse the full lateral width of the cloth backing. Sufficient curing resin is applied to the backing substrate 31 to provide at least one layer of resin before and after the fibrous material reinforced therein, ie on another surface and sometimes even inside the reinforced material. The binder precursor material can not only be applied to the windings before the fibers, but, alternatively, it can be applied directly on the backing substrate 31 after the arrangement on the drum 36 and before the winding on the backing substrate 31 the rolled strands, or in any combination of these coating processes to provide adhesion of the reinforced fibers 37 for the backing substrate 31. It is preferred that the binder precursor used to cover the strands be exposed to an energy source (not shown), any of the thermal energy or radiation energy., for curing the binder precursor plimerizer. Furthermore, such processes as additional curing, flexibility and / or humidification can be carried out within these methods. After this is optional in addition to the procedure, the non-spliced backing, endless can be converted or cut into the desired shape or formed into a preparation for use as an abrasive article backing. The temporary support structure 36 used in such a method is preferable to the drum, which can be made of a rigid material such as steel, metal, ceramic, a strong plastic material or combinations thereof. The material from which the drum is made must have enough integrity to repeat the spliceless backs that can be made without being damaged by the drum. The drum is placed on a mandrel so it can rotate at a speed controlled by a motor. This rotation can be in any interval from 1 to 100 revolutions per minute (rpm) depending on the application. The drum is normally rotatable in the practice of the invention. Although, it is also contemplated that the drum may be non-rotating where the media applied to the strands are capable of traveling around the circumference of the drum. The drum can be unitary or made of segments or pieces that collapse to easily withdraw from the backrest without splicing, without end. The circumference of the drum generally corresponds to the internal length (circumference) of the backing gauze substrate without splicing, endless. The width of the backing gauze substrate without splice, endless, can be of any value less than the width of the drum. A non-spliced endless backing can be made on the drum by removing it from the drum, and its sides are cut off. Additionally, reinforced backrests can be cut lengthwise into multiple reinforced backrests with each one having a width substantially less than the original backing. In many cases, it is preferable that a release coating is applied to the periphery of the drum after the binder precursor or backing gauze substrate without splicing or any of the other components are applied. This is provided by easy release of the backing without splicing, after the binder has solidified. In most cases, this release liner can not be part of the backrest without splicing, if at all. If a collapsed drum is used in the preparation of a spliceless, large endless backing, such as a linear release aid to prevent or at least reduce, the formation of ridges on the inner surface of the reinforced backrest, caused by seams or welds in the surface of the drum. Examples of such release coatings include, but are not limited to, waxes, silicone or fluorochemical waxes, polymeric films coated with silicone or fluorochemical waxes. It is also within the scope of this invention to use a second release coating that is applied on top or top coat of the binder. This second release coating is typically present during the solidification of the binder and can then be removed. Alternatively, in the preparation of a coated abrasive article of the present invention, the reinforced fiber layer can be applied to the backing substrate substrate without splicing around two drum rolls, which are connected to a motor to divide the Last one of the rollers to rotate the backrest. Alternatively, the backrest may be installed around a rolling drum, which is connected to a motor to rotate the backrest. As the revolving backs, the adhesive layers or abrasive slurries are applied by any conventional coating technique such as knife coating, nozzle coating, roll coating, spray coating or curtain coating. Spray coating is preferred for certain applications. After applying the fibrous reinforced material to the backing gauze substrate without splicing and curing the binder precursor, in this embodiment, the resulting backing is removed from the temporary drum, the ground and any high points are optionally removed and then the abrasive cover is applied to any of the reinforced fibrous layers or the opposite side of the non-spliced backing substrate. The fibrous reinforced backing should be rotated within (all) to expose the opposite surface of the non-spliced backing substrate, i.e., the side of the backing substrate opposite the fibrous reinforced layer, if the abrasive cover is to be applied to the surface . Either way, the fibrous reinforced backing is again temporarily supported on any suitable support means such as any drum or at least two roll idlers (rolling mill) for the application of a thick abrasive slurry or abrasive coating (elaborate cover of a sequential coating and abrasive particles). If a thick abrasive slurry is not used, that is, if a second abrasive material is applied afterwards or the processed adhesive layer is applied, the abrasive grains can be deposited electrostatically on the adhesive layer by an electrostatic coating. The drum roller acts as the ground plate for the electrostatic coating. Alternatively, the abrasive grains can be applied by mineral drip coating or magnetic coating. Preferably, the finished coated layer is solidified, or at least partially solidified, then the abrasive particles are embedded, and then a sizing coat (and optionally a super-sizing cover) is applied. The size-coated adhesive layer can be applied by any conventional method, such as roller coating, spray coating or curtain coating. The sizing cover is preferred to be applied by spray coating. The working and the covered layers of size can then be fully solidified while the backing is still on the drum rollers. Alternatively, the resulting product can be removed from the drum rolls after solidification of the adhesive layer (s). Examples of the specific materials used in the method and the coating abrasive product of the invention are described in greater detail herein. The abrasive coating articles of the present invention include a fibrous reinforced backing with the following properties. The reinforced backing is sufficiently heat resistant under grinding conditions for which the abrasive article is intended to be used such that the backing performed does not significantly disintegrate, i.e., cracking, cracking, delaminating, tearing or a combination thereof. , as a result of the generation of heat during a milling, sanding or polishing operation. The reinforced backing is also sufficiently hard that it will not mean breaking or crashing from the forces encountered under grinding conditions for which the abrasive article is intended to be used. That is, that is hard enough to typically resist grinding conditions encountered by the coated abrasive webs, but not undesirably brittle. Preferably, the reinforced backings and coated abrasive strips of the present invention are sufficiently flexible to withstand milling conditions. Because of "sufficient flexibility" and variants thereof in the context, it is significant that reinforced backings and endless spliced abrasive bands will be flexible or bend under typical grinding conditions and will return to their original shape, without significant permanent deformation . In addition, for the preferred grinding applications, the reinforced backing (and the non-spliced abrasive belt incorporated therein) is able to flex and adapt to the contour of the workpiece to be worn, it is still strong enough to transmit an effective grinding force when pressed against the work piece.

The reinforced backing of the present invention is preferred possessing a uniformly general stretching resistance in the longitudinal direction, ie in the machine. This is typically 5 due to the fibrous reinforced material spread along the total length of the backing and without seams of the continuous fibrous reinforced material. More preferably, the stretch resistance for any portion of a backup tester varies by more than 20% of any other portion of the reinforced backing structure. Stretch resistance is generally a measure of the maximum stress to a material attached to a stretch load that can resist without tearing. The preferred reinforced backings of the present invention also show control of appropriate shapes and are sufficiently insensitive to environmental conditions, such as humidity and temperature. By this means he prefers the reinforced backing of the present invention possess the properties listed in the foregoing under a wide range of environmental conditions. Preferably, reinforced backs have the properties listed above without a temperature range of about 10-30 ° C, and a humidity range of about 30-90% relative humidity (RH). More preferably, the reinforced backing possesses the properties listed above under a wide range of temperatures, i.e., from about 0 ° C to about 100 ° C and a wide range of moisture values, below 10% RH to 100. % RH. The reinforced backing must also be able to withstand the grinding and environmental conditions so that the product of abrasive coating article is attempted.

Backup Substrate The material of the preferred backing substrate used in the backing substrate of the present invention is generally chosen such that it must be compatible with, and good adhesion to, the adhesive layers, particularly in the manufacture of the cover. Good adhesion is determined by the amount of "shelling" of the abrasive material. Flaking is a term used in the abrasive industry to describe the unwanted premature release of a significant amount of abrasive material from the backing. Although the selection of the backing substrate material is important, the amount of shredding typically depends on a greater extent on the portion of the adhesive and the compatibility of the backing substrate and the adhesive layers and milling conditions. The backing substrate is comprised of a backing substrate (similar to a tube) without splice, endless. The backing substrate is then reinforced with continuously wound fibrous material, such as a strand, to provide the backing as described herein. The spliced, endless backed gauze substrate is preferably selected from the group consisting of a polymeric film (including printed polymeric film) a woven fabric, a knitted fabric, paper, a vulcanized, non-woven fibrous substrate, including various combinations and treaties of them. The preferred non-spliced backing substrate is a cloth, knitted or knitted backing. Examples of materials used as backless, endless backed gauze substrates in this invention include polyester, nylon, rayon, cotton, jute and other materials known as cloth backings. The fabrics are comprised of threads in the direction of covering, that is, the direction of the machine and the threads in the direction of filling, that is, in the transverse direction. The fabric backing substrate can be a woven backing, a knit backing, or a weft insertion backing. Tissue building examples include 4 satin fabrics above a warp knit on the fill yarns; the crossed tissue of 2 or 3 above a fabric; simple fabric on one on one fabric and one on two fabrics on two fabrics. In a knitted cloth or pattern insert fabric backing, the warp and fill yarns are not intertwined, but are oriented in two different directions one from the other. The warp threads are placed over the filler threads and secured to the others by knit threads or by an adhesive. The backrest without endless splice is generally a tubular backrest, meaning that in this the beginning or the end can not be found or appreciated. The seamless, endless backup gauze substrate is available from such suppliers as, for example, Advanced belt Technoloy (from Middleto n, CT) under the designations "WT3" and "WT4" and various other fabric manufacturers.

The strands in the backing of fabric substrate can be natural, synthetic or combinations thereof. Examples of natural strands include cellulosic strands such as cotton, hemp, capo, flax, sisal, jute, charcoal, manila, and combinations thereof. Examples of synthetic strands include polyester strands, polypropylene strands, glass strands, polyvinyl alcohol strands, polyimide strands, aromatic polyamide strands, rayon strands, nylon strands, polyethylene strands, and combinations thereof. Preferred threads of the invention are polyester threads, nylon threads a mixture of polyester and cotton, rayon threads and aromatic polyamide threads. The fabric backing substrate can be dried and / or stretched, desized, washed or stretched by heat. Additionally, the strands on the cloth backings may contain first dyes, pigments or wetting agents. The strands may be twisted or textured. The polyester strands are formed of a long chain polymer from the reaction of an ester of the dihydric alcohol and terephthalic acid; preferably this polymer is a linear polymer of poly (ethylene terephthalate). These are three main types of polyester threads; ring spinning, open end and filament. The ring spinning strand is made by continuous drawing of a polyester strand, twisting the strand and entangling the strand on a coil. An open end strand is made directly from a twist or first twist. A series of first polyester twists are opened and then all the first twists are continuously carried in a spinning apparatus to form a continuous strand. A strand of filament is an elongated continuous fiber; A typical filament strand has a very low or no existing gauze to the polyester fiber. The fiber diner should be less than about 5000, preferably between about 100 to 1500. The strand size is in the range from about 1500 to 12,000 meters / kilograms. For a coated abrasive cloth backing, the weight of the raw fabric, i.e., the untreated fabric, will range from about 0.15 to 1 kg / m2, preferably between about 0.15 to 0.75 kg / m2. The backing substrate may have an optional saturated resin coating, a sizing cover and / or backing sizing. If the backing substrate is a fabric backing substrate, at least one of these covers is required. The purpose of this cover is to seal the backing substrate and / or protect the threads or fibers in the backing substrate. The addition of the backing or sizing cover can additionally result in a "smooth" surface or on the opposite or front side of the backing substrate. The backing or sizing cover can penetrate through the thickness of the backing substrate, or it can be applied so that the single coating penetrates half the thickness of the substrate. The depth of penetration can be controlled by the viscosity of the various coatings. The viscosity can be altered, for example, by additions of silica or clay. The backing substrate may optionally have a saturated resin cover, a sizing cover and / or backing sizing. If the backing substrate is a fabric backing substrate, at least one of these covers is required. The proposals of these covers is to seal the backing substrate and / or protect the threads or fibers in the backing substrate. The addition of the sizing cover or the backrest siding may additionally result in a "smooth" surface on or opposite or opposite the backing substrate. The sizing or backing sizing covers can penetrate through the backing substrate, or they can be applied so as to penetrate only half the thickness cover of the substrate. The depth of penetration can be controlled by the viscosity of the various coatings. Viscosity can be altered, for example, by the addition of silica or clay. After either of the saturation covers, the sizing cover or the backing sizing cover is applied to the backing substrate, the resulting backing substrate can be heat treated or heated. The heat treatment can be carried out as the precursor of the binder is at least partially solidified by application of the backing substrate in a frame or holding structure which is in an oven. Additionally, the backup substrate can be processed through heated cans. The calendering step will remove some rough surface and typically increase the smooth surfaces. Examples of latex resins that can be mixed with the phenolic resin to treat the fabric backings include acrylonitrile butadiene emulsions, acrylic emulsions, butadiene emulsions, styrene butadiene emulsions and combinations thereof. Latex resins are commercially available under various distributors from a variety of different sources including: "RHOPLEX" and "ACRYSOL", commercially available from Rohm and Company, "FLEXCRYL" and "VALTAC" commercially available from Air Products &; Chemicals Inc., "SYNTHEMUL" and "TYLAC" commercially available from Reichold Chemical Co. , "HYCAR" and "GOODRITE" commercially available from B.F. Goodrich, "CHEMIGUM" commercially available from Goodyear Tire and Rubber Co. , "NEOCRYL" commercially available from ICI, "BUTAFON" commercially available from BASF, and "RES" commercially available from Union Carbide. The backing substrate may additionally comprise other optional materials, such as additives selected from the group comprising filters, fibers, antistatic agents, lubricants, wetting agents, surfactants, pigments, coupling agents, plasticizers and suspending agents, such as those described. for the backups in PCT published application No. WO 93/12911 published July 8, 1993 (Benedict et al.). The amounts of these materials are selected to provide the desired properties.

Fibrous Refurz Material The fibrous reinforced material used in the invention to reinforce the backing gauze substrate without splices, preferably is in the form of individual fibrous strands. Alternatively, the material may be a woven fibrous strip having a width less than that of the backing substrate, such as in a preferred ratio of 1/100 to 10/100. Fibrous strands suitable for this invention are commercially available as yarns, cords, strands, threads or yarns and filaments. The threads and cords are typically thread assemblies. A thread has a high degree of torsion with a low friction surface. A cord can be assembled by braiding or twisted yarns and is then a generally long yarn. A strand is a plurality of fibers or filaments twisted at the same time or entangled. A yarn is a plurality of fibers or filaments pulled together without a gauze or with a minimum gauze. A filament is a continuous fiber. Both yarns and strands are understood as individual filaments. A fibrous mat or mesh consisting of a fiber matrix, i.e., thin wire-like pieces with an appearance ratio of at least about 100: 1. The aspect ratio of a fiber is the ratio of the long dimension of the fiber to the short dimension. In general, the fibrous reinforced material can be comprised of any material that increases the length of the backing and / or prevents stretching. Examples of reinforced fibrous material used in applications of the present invention include metallic and non-metallic fibrous material, with the preferred being non-metallic. The non-metallic fibrous material can be made of glass materials including "FIBERGLAS", carbon minerals, synthetic or natural heat resistant organic reinforced materials, or ceramic materials. The preferred fibrous reinforced materials for the present invention are organic materials, glass and ceramic fibrous material. The natural organic fibrous materials used include wood, silk, cotton, or cellulose. Examples of synthetic organic fibrous materials used are made of polyvinyl alcohol, nylon, polypropylene, polyester, rayon, polyamide, acrylic, polyolefin, aramid or phenol. The preferred organic material for applications of the present invention is aramid fibrous material; such material is commercially available from DuPont Co. under the commercial name of "KEVLAR" and "NOMEX". This is also possible to have more than one type of reinforced fiber in the construction of the backrest. Generally, any ceramic fiber reinforced material is used in the applications of the present invention. An example of a ceramic fibrous reinforced material suitable for the present invention is "NEXTEL" is commercially available from The 3M company. This is possible to use more than one type of reinforced fiber in this construction. Different nylon fibers, such as "FIBERGLAS" and nylon, or "FIBERGLAS" and polyester, or aramid and nylon, or aramid and polyester can be used in combinations such as the types of strand material by alternating transverse winding, the width of the back without formed splice, or in the same winding direction or in an interlaced cross type winding. The different fibers used should be chosen for their desirable properties, such as low stretch for glass fibers and high strength for nylon. This is also possible for cotorceduras of 2 or more strands together, the threads are the same or different in any of the compositions, diner, kink and forward, and then the remaining thread is applied to the backing without splicing as a single strand. The different strands can be selected to contribute different desired physical properties for the composition of the cotorcida fibers to provide a balance of properties. Reinforced fibers can contain a pretreatment of the same type, previous to be incorporated in the backup. This pretreatment can be an adhesive promoter or a blade compound. For example, fiberglass reinforced fibers may contain a surface treatment, such as an epoxy or a fiberglass strand compatible with urethane to promote adhesion of the processed shell. Examples of such glass fiber strands are the "930" glass fiber strands of PPG, Pittsburgh, PA, and "603" glass fiber strands from Owens-Corning. Useful grades of such glass strands and are spun are in the range of about 150 to 32,000 meters / kg, which are also preferred.

If the fibrous reinforced material is used, it is preferred that the fibrous glass material is accompanied by an interfacial binder agent, i.e., a coupling agent, such as a silane coupling agent, to improve the adhesion of the binder material. organic, particularly if a thermoplastic binder material is used. Examples of silane coupling agents include "Z-6020" or "Z-6040" both available from Dow Corning Corp. It is required that the fibrous reinforced material is of sufficient length to extend along the length, i.e. , circumferentially, of the gauze abrasive cover, a plurality of times and provides at least one different cover of fibrous reinforced material. In other work, the fibrous reinforced material is of sufficient length to place the strands in a helical spin pattern of a plurality of loops in a layer within the organic polymeric binder material, with each strand of the strand parallel to and in contact with each other. with the previous thread of the thread. General and preferably this helix extends longitudinally along the total length of the backing gauze. That is, each gag of strand approach to a relative position parallel to the lateral edges of the gauze, although the gauze is not individually precisely parallel to the lateral edges. More preferably, the gauzes are at a constant, substantially at a relative non-zero angle of the parallel lateral edge of the backing substrate without splices or fabric. The reinforced fiber diner, that is, the degree of fineness, for ranges of preferred fibrous reinforced material from about 5 to about diners, typically between about 50 and about 2000 diners. More preferably, the fiber diner will be between about 100 and about 1500. It is understood that the diner is of a strong influence for the type of particle of the fibrous reinforced material employed. It is possible in this invention that it provides distinct regions of the backing (backing gauze substrate without splices / reinforced cover) that does not have fibrous reinforced material herein. This results in a backing area that has a higher proportion of fibrous reinforced material for the organic polymeric binder material than in another area. For example, fibrous reinforced material can be fully located in an area of the lateral side and / or the central area of the backing layer that some other edge thereof can be substantially not covered by the fibrous reinforced material. This modality may not be accepted in all cases as its could create an uneven surface on the backrest. With the reinforcement of the backing substrate, the fibrous reinforced material is enlarged in the spliceless backing substrate which is temporarily supported on a supporting structure described herein. Such as a drum structure. The binder precursor can be applied first to the non-spliced backing gauze substrate, followed by spinning the reinforced material. Alternatively, the reinforced material can be applied first to the non-spliced backing gauze substrate, followed by the binder precursor. In a third embodiment, the reinforcing material first saturated with the binder precursor and applied to the backing gauze substrate without splicing. In this way, the binder precursor can be applied sequentially or simultaneously with the reinforced material. This is within the scope of this invention to use a combination of any of the three above methods. It is also within the scope of the invention to use a non-woven substrate in combination with reinforced fibers. The non-woven substrate, in some cases, can increase the tear resistance of the resulting backing. This is contemplated for example, that a nonwoven substrate is first unsaturated with a first binder precursor and applied onto the second surface of the backing substrate. Then, the reinforcing strand is applied over the saturated nonwoven substrate. The first binder precursor will moisten the reinforced yarn and the reinforced yarn is bonded to the backing substrate. In one aspect of the invention, the reinforced fibers are applied to a non-spliced, endless backing gauze substrate already containing an abrasive cover. In this aspect, backing substrate is turned upside down, that is, the faces of the abrasive coating of the support drum and the reinforced fibers are applied to the opposite abrasive coating of backing substrate surface. After the reinforced fibers are applied and the binder precursor is solidified, the resulting endless band essentially turns upside down to form the endless coated abrasive article. The endless abrasive web article of the invention comprises a backing having a non-spliced backing gauze substrate and a plurality of the continuous reinforced fibers present on the surface area. It is generally preferred that non-interlocked and parallel reinforced fibers are applied to the backing substrate. Thus also within the scope of the invention the reinforced fibers are continuous over the complete lateral spinning of the non-spliced backing gauze substrate, ie, this is not substantially fractured or open in the spaces of the reinforced cross fiber of the substrate yarn. backup. It is undesirable that reinforced fibers have a starting end and a trailing end with the intermediate length of the fiber continuous in at least one revolution around the non-spliced backing gauze substrate. While the use of formed fibers are preferred as the fibrous reinforced material, the use of monofilament thermoplastic and extruded thermoelastic pellets and helical winding as in situ cooled on the backing substrate without splices are also contemplated.

Precursor material Binder for Reinforced Fiber The binder precursor material used to secure the fibrous reinforced material or yarn strips that can be selected from a variety of widths of the binder material that can be applied in liquid form and layer solidification. Typically, the amount of the binder precursor, which is an organic polymeric binder material, used to saturate the reinforced fibers are within a range of about 40-99%, more preferably within the range of about 65-92% by weight and more preferably within the range of about 70-85% by weight, based only on the total weight of the fibrous reinforced layer. The binder material used to cure the reinforced material in the fibrous reinforced layer as an organic polymeric binder material. This may be a cured or solidified thermosetting resin, thermoplastic material, or elastomeric material. It is preferred that the binder material is a thermosetting resin, at least because such resins can be provided in a variety of flowable fluid (flow viscosity) formed when it is not cured, even under ambient conditions. Here, the phrase "environmental conditions" and the variants refer to room temperature, i.e. 15-30 ° C, generally about 20-25 ° C and 30-50% relative humidity, generally about 35- 45% relative humidity. If the organic polymeric binder material includes a curable thermosetting resin, prior to the manufacture of the backing, such as by wetting the reinforced fibers and / or by impregnation of a fabric backing fabric 11 with a binder precursor, the resin The thermoplastic is in a non-polymerizable state, typically in a liquid or semi-liquid state. During the manufacturing processes, the thermosetting resins are cured or polymerizable to a solid state. Depending on employing the thermosetting resin in particular, the thermosetting resin may use a curing or catalyzing agent. When the curing agent is exposed to an appropriate energy source (such as thermal energy or radiation energy) the curing agent will initiate the polymerization of the thermosetting resin. Examples of thermosetting resins that the backing can be made of include phenolic resins, aminoresins, polyester resins, aminoplast resins, urethane resins, melamine-formaldehyde resins, epoxy resins, acrylate isocyanurate resins, urea-formaldehyde resins, resins of acrylate and mixtures of isocyanurate resins, acrylated urethane resins, acrylated epoxy resins or mixtures thereof. Preferred thermosetting resins are urethane resins, acrylate resins, epoxy resins, acrylated urethane resins, polyester resins or flexible phenolic resins and mixtures thereof. The most preferred resins are urethane resins, acrylated resins, epoxy resins, acrylated urethane resins and mixtures thereof, because these show a cure rate, flexibility, good thermal stability, strength and water resistance. A preferred class of binder material is a polyurethane elastomer, in particular a polyester-based polyurethane. Examples of such polyurethane material are commercially available from Uniroyal Chemical under the trade designation "VIBRATHANE" and "ADIPRENE". These polyurethane elastomers are formed from prepolymers which may be a polyether based on toluene-terminated diisocyanate, a prepolymer or polyether based on diphenylmethane disocyanate. These prepolymers can be cross-linked with 4,4 '-methylene-bis- (ortho-chloroaniline) or a curative diamine. Polyurethane binders are also preferred, because during thermal curing the polyurethane resins are not appreciable to reduce the viscosity and this is not noticeable during flow curing. It is also within the scope of the invention to mix polyurethane resins with epoxy resins and acrylate resins. Phenolic resins are usually catalyzed as phenolic resins or novolac resins. Useful examples of commercially available phenolic resins are "VARCUM" from BLT Specialty Resins Corporation; AROFENE "by Ashland Chemical Company;" BAKELTE "by Union Carbide; and" RESINOX "by Monsanto Chemical Company Resol phenolic resins are characterized by being alkaline catalysts and having a molar ratio of formaldehyde, to phenol, to greater than or equal to at 1: 1 Typically, the ratio of formaldehyde to phenol is in the range of about 1: 1 to about 3: 1. Examples of desirable alkaline catalysts for preparing phenolic resole resins include sodium hydroxide, potassium hydroxide, amines organic or sodium carbonate Novolac phenolic resins are characterized as being acid catalysts and have a molar ratio of formaldehyde to phenol of less than 1: 1. Typically, the ratio of formaldehyde to phenol is in the range of about 0.5: 1 to about 0.8: 1 Examples of the acid catalyst used to prepare Novolac phenolic resins including sulfuric, hydrochloric, phosphoric acids , oxalic, or p-toluenesulfonic. In addition Novolac phenolic resins are typically considered to be quite thermoplastic resins of thermosetting resins, this can react with other chemicals (eg haxamethylenetetramine) to form a crude thermosetting resin. The epoxy resins used in the polymerizable mezcal used to prepare backings of the invention include monomeric or plimeric epoxides. Epoxy materials are used, that is, epoxies, can be very variable in the nature of their support groups and substituents. Representative representative examples of substituents include halogens, ester groups, ether groups, sulfonate groups, siloxane groups, nitro group or phosphate groups. The weight average molecular weight of the polymeric materials contain epoxy can vary from about 60 to about 4000 and those in the range of about 100 to about 600 are preferred. Mixtures of various epoxy-containing materials can be used in the composition of this invention. Examples of commercially available epoxy resins include "EPON" from Shell Chemical Co.; and "DER" from the Dow Chemical Company. Examples of commercially available urea-formaldehyde resins include "UFORMITE" from Reichold Chemical Inc .; "DURITE" by Borden Chemical Company; and "RESIMENT" by Monsanto. Examples of aminoplast resins useful in applications according to the present invention are those having an alpha-pending, beta-unsaturated carbonyl groups per molecule, which are described, for example, in U.S. Patent Nos. 4,903,440 (Larson et al.) And 5,236,472 (Kirk and colleagues).

These usable acrylate isocyanurate resins are prepared from the mixtures of; at least one monomer selected from the group consisting of isocyanurate derivatives having at least one terminal or pendant acrylate group and iscyanate derivatives having at least one terminal or pendant acrylate group; and at least one aliphatic or cycloaliphatic monomer having at least one pendant terminal or acrylate group. These acrylamide isocyanurate resins are described, for example, in U.S. Patent No. 4,652,274 (Bottcher et al.). The ethylenically unsaturated resins include both monomers and polymeric compounds containing carbon, hydrogen and oxygen atoms and optionally nitrogen and the halogens. Oxygen and nitrogen atoms or both are generally present in the ether, ester, urethane, amine and urea groups. Ethylenically unsaturated compounds having a molecular weight of less than about 4,000 are preferred and are preferably esters made from the reaction of the compounds having aliphatic monohydroxy groups or polyhydroxy aliphatic groups and unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, acid itaconic, crotonic acid, isocrotonic acid, maleic acid and the like. Representative examples of acrylic resins include methyl methacrylate, ethyl styrene-methacrylate, divinylbenzene, vinyl toluene, glycolyletylene diacrylate, glycolyletylene methacrylate, hexadienol diacrylate, glycoltriethylene diacrylate, propylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate glycerol triacrylate, methacrylate pentaerythritol, tetraacrylate. Other ethylenically unsaturated resins include monoallyl, polyallyl and polymethallyl esters and diallyl adipate and N, N-diallyladipamide. Still other compounds containing nitrogen include tris (2-acryloxy-oxyethyl) isocyanurate, 1,3,5-tri (2-methylacryloxyethyl) -s-triazine, acrylamide, methacrylamide, N-methylacrylamide, NN-dimethylacrylamide, N-vinylpyrrolidone and N-vinylpiperidone. Acrylate urethanes are NCO hydroxy terminal diacrylate esters extended polyesters or polyethers. Examples of commercially available acrylated urethanes include "UVITHANE 782", available from Morton Thiokol Chemical, and "CMD 6600", "CMD 8400" and "CMD 8805" available from Radcure Specialties.

The acrylated epoxy are diacrylate esters, such as the diacrylate esters of epoxy resins A bisphenol. Examples of commercially available epoxy acrylates include those having the trade names "EBECRYL 3500" and EBECRYL 8850"available from Radcure Specialties.The appropriate thermosetting polyester resins are available as" E-737"or" E-650"from Owens-Corning Fiberglass Corp. Polyurethanes are also available as "VIBRATHANE" prepolymer B-813 or "ADIPRENE" prepolymer BL-16 used with "CAYTUR" -31 curative, all are available from Uniroyal Chemical, as previously indicated, in the same applications In the present invention, a thermoplastic binder material can be used to bond the reinforced fiber coil to the backing substrate, such as the preferred thermosetting resins described above.A thermoplastic binder material is a polymeric material that softens when exposed to temperatures elevated and usually returns to its original physical state when the temperature is cooled to During the manufacturing process, the temperature is preheated to soften the thermoplastic binder, and previously the temperature frequently fuses, to be in a state that can flow. After the reinforced fibers are bonded to the backing substrate, the thermoplastic binder is cooled and solidified. The thermoplastic materials of the invention are those that have a high melting temperature and / or good heat resistant properties; That is, preferred thermoplastic materials have a melting point of at least about 100 ° C, preferably at least about 150 ° C. Additionally, the melting point of the preferred thermoplastic material is sufficiently lower, ie, less than at least about 25 ° C, than the melting temperature of the reinforcing material. In this way, the reinforcing material is not adversely effective during the melting process of the thermoplastic binder. Examples of thermoplastic materials available for backing preparations in articles according to the present invention include polycarbonates, polyetherimides, polyesters, polysulfones, polystyrenes, acrylonitrile rilbut adienestirene block copolymers, polypropylenes, acetal polymers, polyamides, polyvinyl chloride, polyethylenes , polyurethanes or combinations thereof. From this list. Preferred are polyamides, polyurethanes and polyvinyl chlorides, with polyurethanes and polyvinyl chlorides may be preferred. If the thermoplastic material from which the backing is formed is a polycarbonate, polyetherimide, polyester, polysulfone or polystyrene material, a former can be used to reinforce the adhesion between the fibrous reinforced layer and the formed shell, if the formed shell is chosen to be applied on either side of the backrest. The term "printer" is meant to include both types of mechanical and chemical printers or printing process. This does not mean to include a layer of fabric or attach the fabric to the surface of the backrest. Examples of mechanical printers include, but are not limited to, corona treatment and entrainment, both of which increase the surface area of the surface. An example of a chemical printer is a colloidal dispersion of, for example, polyurethane, acetone, a colloidal silicon oxide, isopropanol and water as described, for example, by U.S. Patent No. 4,906,523 (Bilkadi et al.). Although, the impression of a surface may involve entrainment, that is, above they become roughened to increase the surface area of the surface, the surface of the backing is still relatively "smooth" as defined above. That is, the topological surface is generally smooth and flat such that it is small, if any, it is exposed, that is, fibrous reinforced material protrudes. Preferably. The topological surface is generally unaffected by the fibrous reinforced material without the organic polymeric binder material such that the topology would have to be viewed primarily of the fibrous reinforced material. A third type of binder used in the reinforced fiber saturation of the present invention is a material elastomer An elastomeric material, i.e., elastomer is defined as a material that can be stretched, or lastly double its original length and then retract very quickly to approximate its original length, when released. Examples of elastomeric material used in applications of the present invention include copolymers of styrene-butadiene, polychloroprene (neoprene), nitrile rubber, butyl rubber, polysulfide rubber, bis-1,4-polyisoprene, ethylene-propylene terpolymers, rubber of silicon or polyurethane cuckoo. In some cases, the elastomeric materials may be cross-linked with sulfide, peroxides or similar curing agents to form crude thermosetting resins. Taking care of the spirit takes a monitoring of the viscosity of the binder material during its application to the strands of reinforced fibers. If the viscosity of the binder precursor is too low, then during the processing of the abrasive article, the binder precursor will be flow or "stroke". This flow is undesirable and can cause the change of placement and orientation of the reinforced fibers. On the other hand, if the viscosity of the binder precursor is too high, then the binder precursor may not be suitable to wet the reinforced fibers. A preferred viscosity range is between about 500 to 20,000 centipoise, more preferably between 1,000 and 15,000, and more preferably between 2,000 to 10,000 centipoise. These viscosity measurements were taken at room temperature. The viscosity can be adjusted by the amount of solvent (the solid% of the resin) and / or the chemistry of the initial resin. It can be further heated to be applied, during the application of the reinforced strands to the backing substrate without splicing on the temporary support, for better effect wetting the binder precursor on the reinforced fibers. However, the amount of heat must be controlled, such that the solidification of the binder precursor is not permian. Preferably reinforced fibers should be substantially submerged in the binder or shrink, however these may be smaller, preferably a very small amount of reinforced fibers that were not immersed in the binder precursor. This must be enough binder to fill substantially any gap or space between the reinforced fibers, although sometimes that is desired, to remain a bit of the texture. The term "sufficient" means that there is quite a binder precursor to provide an abrasive backing having the desired properties for the intention of the application. These properties include tensile strength, heat resistance, tear strength, stretch, and the like. There may be enough binder in a backing and it still has some internal porosity. In addition, however, it is preferred that this internal porosity be minimized; Additionally, the binder will typically seal the back or bottom side of the backing to provide a continuous layer or cover on the underside of the non-spliced backing substrate. The term sealing means is a liquid, such as water, can penetrate the backrest through the underside of the backrest. Typically, the binder precursor is exposed to an energy source, such as thermal energy or radiation energy. The fibrous reinforced backing can be rotated onto the drum during thermal cure. This rotation can minimize the binder precursor of the fluid during its cure to a non-smooth contour, and this ultimately minimizes the change of abrasive particles if it is then applied to the fibrous reinforced layer during a cure of the made cover. A method of making the reinforced backing structure of the invention is primarily to provide a backing gauze substrate without endless splice having the length of the length of the final desired web; this backing is then removed, applying to a support structure or a drum. Alternatively, the threads or the strands and the glass fibers are then applied to the backing substrate without splicing by winding techniques described above. Alternatively, the two different types of fibers can be polyester and aramid. As the threads are applied, the tension must be set such that the threads are stretched below the backing substrate without splicing. This tension will also help to promote the wetting of the binder precursor on the reinforced yarns. This is sufficient binder precursor used to at least moisten the reinforced yarns before, during or after their application to the surface of the backing substrate.

In the same examples, to make a uniform backing, the fibrous reinforced material is applied in two coiled layers, these two layers have windings that cross in inclination. It is preferred that after the first winding, the binder precursor is applied with a smaller partially cured portion before a second winding layer is applied (further including a binder precursor). In a further optional embodiment of the invention, garnet, silica, polymer particles or carbon particles, and the like, can be dispersed, such as electrostatic coating, thick suspension coating, drip coating or spray coating, for use with a similar resin, to moisten the fibrous reinforced strands. This dispersion can be covered on any of its exposed sides of the backing substrate or the fibrous reinforced layer, either side being opposite to the side of the final bearing of the abrasive coating, to print the texture to provide a settling cover frictional or a traction cover. This traction cover can facilitate the impulse of the band. The traction cover can also be formed of a binder precursor with mineral particles of dispersible fibers thereof, or woven or non-woven fabrics.

Abrasive coating The reinforced backing structure comprises a backing gauze substrate without splices and the fibrous reinforced material applied thereon as described herein, is then used as an abrasive backing cover. The abrasive material can be applied by any known means, i.e., drip coating, thick slurry coating, electrostatic coating, roller coating, etc. Preferably the abrasive coating is applied to the back side having the conventional non-spliced backing due to the adhesive increase to the conventional backing on the fibers. Once the fibrous reinforcement backing is formed, the introduction of the abrasive particles and the various adhesive layers, which are also typically applied in a binder precursor form, is contemplated in the context of forming the abrasive coating surface of the article.

Shaped cover A formed cover, or second adhesive layer, can be applied on either side of the backing, the side of the backing substrate without splicing or the side of the reinforced fiber layer, in any way that is preferred the side of the backing substrate without splicing. The binder precursor of the formed cover can be covered by any conventional technique, such as knife coating, roll coating, roll coating, rotogravure coating and the like. The compositions of the adhesive layers relating to the formed cover and the size and super-sizing layers mentioned below can be of the following materials. The adhesive layers in the coated abrasive articles of the present invention use various shaped, sized and super-sized covers, typically forming a resinous adhesive. Each of the layers can be formed from the same or different resinous adhesives. Conveniently the resinous adhesives are those that are compatible with the organic polymeric binder materials of the backing. Crude resinous adhesives are also tolerant to milling conditions such that the adhesive layers do not deteriorate and prematurely release the adhesive material. The resinous adhesive prefers a thermosetting resin layer. Examples of thermosetting resinous adhesives suitably used for this invention include, without limitation, phenolic resins, aminoplast resins, urethane resins, epoxy resins, acrylated resins, acrylated isocyanurate resins, urea-formaldehyde resins, isocyanurate resins, acrylated urethane resins , epoxyacrylated resins or mixtures thereof. Preferably, the thermosetting resinous adhesive layers contain a phenolic resin, an aminoplastic resin or combinations thereof. Of the phenolic resins, a resole phenolic resin is preferable. Examples of commercially available phenolic resins include "VARCUM" from OXY Chem Corporation, Dallas, TX; "AROFENO" from Ashland Chemical Company, Columbus, OH; and "BAKELITE" by Union Carbide, Danbury, CT. A preferred aminoplast resin is one having at least one alpha group pendant, beta-unsaturated carbonyl per molecule, which is made according to the disclosure of US Pat. No. 4,903,440 (larson et al.) Or 5,236,472 (Kirk et al.). The processed and sized cover, layers 27 and 29 respectively in Figure 2, may preferably contain other materials that are commonly used in abrasive articles. These materials, referred to as additives, include grinding aids, filters, coupling agents, wetting agents, driers, pigments, plasticizers, release agents or combinations thereof. There is no more typical use of these materials that need the desired results. The fillers are typically present in no more than an amount of about 90% by weight for any of the sizing or formed cover, based on the weight of the adhesive. Examples of fillers used include calcium salts, such as calcium carbonate and calcium metasilicate, metals, carbon or glasses. Preferably, the adhesive layers, a smaller size and formed cover, the second and third adhesive layers, respectively, are formed of a calcium metasilicate filler resin with a coupling agent, such as a resole phenolic resin, for example. . Resole phenolic resins are preferred because of their lower heat tolerance, hardness, high strength and low cost. More preferably, the adhesive layers include about 50-90% by weight of silane treated with calcium metasilicate in a resole phenolic resin.

Abrasive Particles Suitable abrasive particles for this invention include molten aluminum oxide, heat treated aluminum oxide, ceramic aluminum oxide, silica carbide, alumina zirconia, garnet, diamond, cubic boron nitrate, titanium diboride or mixtures thereof. The abrasive particles may be of shapes (eg, round, triangular or pyramidal) or shapeless (ie, irregular). The term "abrasive particle" comprises abrasive grains, agglomerates or multi-grain abrasive granules. Examples of such agglomerates are described in U.S. Patent No. 4,652,275 (Bloecher et al.) And U.S. Application No. 08 / 316,259 (Christianson) filed on September 30, 1994 and assigned by the assignee of the present invention. The agglomerates may be of irregular shapes or have a precise shape associated with the subject, for example, a cube, pyramid, truncated pyramid or sphere. An agglomerate comprises abrasive particles or grains and a binding agent. The binder may be organic or inorganic. Examples of organic binder include phenolic resins, urea-formaldehyde resins and epoxy resins. Examples of inorganic binder include metals (such as nickel) and metal oxides. Metal oxides are used classified as either glass (vitrified), ceramic (crystalline) or ceramic-glass. In addition, the information on the agglomerates is described in the North American application No. 08 / 316,259 (Christianson) filed on September 30, 1994, assigned by the assignee of the present invention includes molten aluminum oxides, aluminum oxides treated with heat and oxide of ceramic aluminum. Examples of such ceramic aluminum oxides are described in U.S. Patent Nos. 4,314,872 (Leitheiser et al.) 4,744,802 (Schwabel), 4,770,671 (Monroe et al.) And 4,881,951 (Wood et al.). The average particle size of the abrasive particle for convenience of the applicants of the present invention is at least about 0.1 microns, preferably and less than about 100 microns. A grain size of approximately 100 microns corresponds approximately to a coated abrasive grain, of an abrasive grade of 120, according to the American National Standards Institute (ANSI) Standard B7 .18-18-1984. The abrasive grain may be oriented, or may be applied to the backing without orientation, depending on the desired end using the coated abrasive backing. The abrasive particles can be integrated into the coated precursor formed by any conventional technique such as an electrostatic coating, drip coating or magnetic coating. During the electrostatic coating, the electrostatic changes are applied to the abrasive particles and this propels the abrasive particles upwards. The electrostatic coating causes the orientation of the abrasive particles that generally lead to improved wear performance. In a drip coating, the abrasive particles are forced from a free station and fall into the binder precursor by gravity. It is also without the scope of this invention to impel particles upwards by a mechanical force within the binder precursor. The magnetic coating tries to use magnetic forces to cover the abrasive particles. If the abrasive particles are applied by electrostatic coating, then it is preferred that the backing be placed on the drum. This drum can be the original support structure of a different drum. The drum serves as a ground for the electrostatic coating process. The appropriate amount of abrasive particles is then applied on a plate below the drum. Afterwards, the drum is rotated and the electrostatic field is turned over. With the turns of the drum, the abrasive particles are integrated into the formed cover. The drum is rotated until the desired amount of abrasive particles are covered. The resulting constructions are exposed to conditions sufficient to solidify the formed layer. Alternatively, a charging plate can be used as the ground for the electrostatic process instead of the drum.

Sizing cover A size coat on the third adhesive layer can be applied on the abrasive particles and the sizing cover such as by roller coating or spray coating. The preferred sizing coat is a resole phenolic resin filled with a silane-treated calcium metalsilicate. After the sizing cover is applied, the sizing cover is solidified, typically on exposure with a power source. These energy sources include both thermal energy and radiation.

Super-sizing cover In the same cases it may be preferred to apply a super-sizing cover or a fourth adhesive layer on the sizing cover. The optional super-sizing cover may be preferred including an auxiliary grind, to reinforce the characteristic sizing of the abrasive cover. Examples of auxiliary mills include potassium tetrafluoroborate, cryolite, aluminum cryolite or sulfide. A non-typical earth used more than an auxiliary grind of what you need for the desired results. The size coat may include a binder and auxiliary grind. The abrasive material can also be applied using an abrasive coated sheet formed. This sheet consists of a substrate of material coated with abrasive grains. The material substrate can be a piece of cloth, polymeric film, vulcanized fiber paper and the like. The sheet can be applied to the other surface of the backing of the present invention using; any of the adhesives described above; thermo-entangling; a pressure sensitive adhesive; or mechanical fastening means, such as gauze or hook means, such as are described, for example, in U.S. Patent No. 4,609,581 (Ott). This may include a joining method by which the sheet is applied to a liquid gauze of the backing binder and reinforced fibers such that the sheet is joined by curing or solidification of liquid from the liquid backing gauze. This embodiment of the abrasive coated article of the present invention is advantageous because of the potential to remove the sheet once the abrasive material is depleted and replaced with another laminate. In this way the backs of the present invention can be recycled and reused. The following examples do not limit the invention to be further illustrated. All parts, percentages, radii, etc., in the examples are by weight units unless otherwise indicated.

EXAMPLES The following designations are used throughout the examples.

DW: deionized water SCA: silane coupling agent, commercially available from Osi specialties (Danbury, CT) under the commercial designation "A-1100"; ASC amorphous silica clay, commercially available from DeGussa GmbH (Germany) under the trade designation "Peerless # 4"; RPR phenolic resole resin, which contains between 0.75 to 1.4% free formaldehyde and 6 to 8% of free phenol, approximately 78% of the percentage of solids with the excess of water, approximately 8.5 of pH and a viscosity of between approximately 2400 and 2800 centipoises; ASF filled with amorphous silica, commercially available from DeGussa GmbH (Germany) under the trade designation "Aerosil R-972"; HLR: latex resin, commercially available from B.F. Goodrich (Cleveland, OH) under the commercial designation "Hycar 1581"; Wet agent SWA1, commercially available from Akzo Chemie America (Chicago, IL) under the trade designation of "Interwet 33"SWA2 moisture agent, commercially available from Union Carbide Corp. (Danbury, CT) under the trade designation" Silwet L-7604"; ERE epoxy resin, commercially available from Shell Chemical Co. (houston, TX) under the commercial designation "Epon 828"; POPDA: polyoxopropylenediamine commercially available from Huntsman Corp. (Salt Lake City, TU) under the commercial designation of "Jeffamine D-230"; URI a polyurethane based on polyurethane resin commercially available from Uniroyal Chemical Corp. (Middlebury, CT) under the trade designation "Adiprene L-167"; DMTA: di (methylthio) toluenediamine commercially available from Albemarle Corporation (Baton Rouge, LA) under the commercial designation of "Ethacure 300"; TPGA: tripropylene glycol diacrylate commercially available from Sartomer (West Chester, PA) under the trade designation "R-306"; PH2: 2-benzi1-2-N, N-dimethylamino-1- (4-morpholinophenyl) -1-butanone commercially available from Ciba Geigy Corp. (Hawthorn, NY) under the trade designation of Irgacure 369"; CMSK: calcium metasilicate, commercially available from NYCO (Willsboro, NY) under the trade designation "400 Wollastokup"; : iron oxide pigment, commercially available from Harcros Pigments, Inc. (Fairview Heights, IL) under the trade designation "Kroma Red Iron Oxide"; GBF: glass sphere, commercially available at Minnesota Mining and Manufacturing Co. (St. Paul, MN) under the commercial designation of "Scotchlite H50 / 10,000 EPX".

Example 1 An endless polyester / cotton splice support substrate available from Advance Belt Technology (Middletown, CT) under the designation "WT-3" is provided. The fabric was 2 cotton more than 1 polyester fabric, with cotton in the warp (machine) direction and polyester in the weft (fill) direction. The polyester was about 11 threads / cm, and the cotton was about 45 threads / cm. The polyester was one circumference of the belt and the cotton was in the cross direction. The length of the non-spliced support was 335.3 cm (132 inches) and the width was 30.5 cm (12 inches). The non-spliced backing gauze substrate was rinsed in a faucet and placed on top of an aluminum plate having a circumference of 335.3 cm, a width of 38.1 cm, and a wall thickness of 0.64 cm. The plate was installed on a 7.6 cm mandrel that was rotated by a DC motor and was capable of rotating from 1 to 45 revolutions per minute (rpms). A saturated backing was applied to the backing without splicing once it was found on the plate. A resin layer, having the following formulation, was coated onto the backing gauze substrate without splices: DW 25 parts, SCA 0.5 part, ASC 14 parts, RPR 21.5 parts, ASF 2.5 parts, HLR 36 parts, SWA1 0.25 part , and SWA2 0.25 part. The viscosity of this saturating resin was 310 cps when measured at 34 ° C with a Brookfield Viscometer, spindle 2, at 60 rpm. The wet weight of the covered saturant was approximately 0.0325 grams per square cm (0.21 grams per inch) and soaked approximately half the thickness of the support gap. After covering, the drum was turned at 3 revolutions per minute and the covered saturant was dried and partially cured using infrared heaters.

A coating of epoxy resin, referred to as a "pre-sizing", having the following formulation, was coated onto the backing without saturated splice: ERH 73 parts, POPDA 24.35 parts, ASF 2.4 parts, and SWA2 0.25 part. The wet weight of this epoxy coating was about 0.009 grams per square cm (0.06 grams per square inch). After covering, the drum was turned at 3 revolutions per minute and the layer was partially cured using the infrared heaters as above. A urethane resin formulation, known as the "coiled" resin has the following formulation, the coating is cured over pre-sizing to form a "base coat": 50 parts of URI, 23 parts of DNTA, 26 parts of TPGA and 0.5 parts of SWA2. The moisture weight of this coating is approximately 0.0325 grams per cm2 (0.21 gms per square inch). After coating, a doctor blade is used to smooth the grinding resin. The smoothed resin is cured for 60 seconds with a bulb (600 watt / inch) "V" from the Fusion System. A second layer of bending resin is covered over the cured base layer, by the method described above. After straightening, with 800 denier "KEVLAR 49" fiber available from Synthetic Thread Co. Inc., Bethlehem, PA, are wound into and within the smoothed resin at approximately 16.5 threads per cm2 (42 threads per inch) of the band width. The fibers were essentially submerged in the resin. "KEVLAR" fibers strengthen the final backing and minimize stretch. The strands are first run through a tensioner and wound through a comb, twice. The reinforced fibrous strands are wound onto the backing gauze substrate without splicing by means of a thread guiding system with a winding wrench that transversely moves the faces of the hub at a speed of 10 cm / minute. During this process, the hub rotates at 45 rpm. After wrapping the resins and fibers, they are smoothed with a doctor blade and cured for 60 seconds with the same "V" lamp. Another layer of folding resin is covered with the same weight of resin directly on the previously cured resin. It heals for 60 seconds with the same "V" bulb. The fibrous reinforced backing structure is removed from the bucket and turned outward, that is, all, so that the reinforced fibers are placed on the side of the gauze.

Example 2 Example 2 is prepared in the same manner as Example 1, except that after the wound resin layers are covered and cured, approximately 0.12-0.25 mm (5-10 mils) of cured resin is removed from the ground with a Doall grinder. D-10 (The Doall Company, Des Plains, IL) using a micron 180 Imperilal Microfinishing Film (from Minnesota Mining and Manufacturing Co.). This fact of grinding helps the back of the backrest when smoothing the backrest later and providing a calibrator even.

Example 3 Example 3 is prepared in the same manner as example 1, except that after application and smoothing of the second layer of coiled resin, a third layer of the coiled resin is covered and smoothed. A second layer of fiber is rolled in and on the smoothed resin. The resin is cured and a fourth layer of resin is covered and cured. The results of the band are all.

Example 4 Example 4 is prepared in the same manner as example 3, except that after the final cure, the band is removed from the hub and cut to 7.62 cm (3 inches). These cut strips are removed to a mandrel (reinforced fibers) and approximately 0.12-0.25 mm (5-10 mils) of cured resin is removed from the ground with a Doall D-10 grinder using a micron 180 Imperilal Microfinishing Film (from Minnesota Mining and Manufacturing Co.). This fact of grinding helps the back of the backrest when smoothing the backrest later and providing a calibrator even. The following designations are used throughout the examples, particularly for the preparation of the abrasive agglomerates.

SAG: cubic boron nitrate grain, 140/170 ERH mesh: epoxy resin, commercially available from Shell Chemical Co. (Houston, TX) under the trademark "Epon 828"; DW: Deionized water; DGME: Ethylene glycol ether-monobutyl, also known as polysolve, commercially available from Olin Company (Stanford, CT); PS100 aromatic solvent, commercially available from Exxon Chemical Co. (Houston, TX) under the trade names "WC-100"; EPH: epoxy hardener, commercially available from Henkel Corporation (Minneapolis, MN) under the trade name "Versamid 125) GPM: glass powder, 50.55 SiO2, 27.0% B202, 8.7% A1203, 7.5% MgO, 2.0% of ZnO, 1.1% of CaO, 1.0% of Na20, 1.0% of K20, 0.5% of Li20, fine grain in 325 mesh.

Example 5 Example 5 produces a coated abrasive band using the backing of example 1 which may have a cut of 7.6 cm (3 inches). The reinforced backing structure of example 1 is reverted, that is to say everything, so that the reinforced fibers are inside and placed under tension on a pair of idle rollers with a roller driven by a motor to rotate the backrest. All resin coatings are on the polyester / cotton side of the backrest. A saturated resin, has the following formulation, a roll is covered on the exposed side of the backing substrate without opposite fibrous reinforced fiber splice: 31.6 parts of DW, 0.4 parts of SCA, 13.3 parts of ASC, 20 parts of PRP, 1.8 ASF parts, 32.4 parts of HLR, 0.25 parts of SWA1 and 0.25 parts of SWA2. The moisture weight of this saturated cover is approximately 0.019 grams per cm2 (0.12 grams per square inch). The saturated backing is placed on a round bucket and dried in an oven for 30 minutes at 90 ° C. A pre-prepared epoxy resin, has the following formulation, this is the blade coating on the dry backing: 73 parts of ERH, 24.35 parts of POPDA, 2.4 parts of ASF and 0.25 parts of SWA2. The wet weights of the size covers are approximately 0.011 grams per cm2 (0.07 grams per square inch). The covered back is placed on a round bucket and cured in an oven for 30 minutes at 90 ° C. A phenolic resin, having the following formulation, is made with this blade coating in 5.7 cm (2.25 inches) of road width over 7.6 cm (3 inches) of backup path: 34.29 parts of RPR, 12.46 parts of DW, 51.85 parts of CMSK, 0.75 parts of ASF, 0.19 parts of ASC, 0.23 parts of SWA1 and 0.23 parts of SWA2. The shown cut (gap) is set at 0.3 mm (0.013 inches). It is verified that the agglomerates are prepared according to the methods described below. A GPM glass binder is formulated so that the coefficient of thermal expansion is approximately the same as the coefficient of thermal expansion of the superabrasive granose used in the example (3.5 x 10"6 / ° C) It is verified that the agglomerates are formed by mixing the following formulation to form a slurry: 47.2 parts of SAG, 17.1 parts of GP, 6.8 parts of ERH, 3 parts of PS100 and 22.3 parts of 85/15 EGME / DW The thick suspension of the knife coating in a silicon mold with holes approximately 1016 micrometers deep, long and wide (0.040 inches) The thick suspension is dried and cured in the mold at 90 ° C 30 minutes The resulting cubes are removed from the mold To prevent the formed agglomerates from being bonded together during the final processes, the dry agglomerates are placed in a 220/230 mesh bed SAG in a b alumina acetate. The gazette is placed in a small oven that is open to the air. The temperature of the oven increases from 25 ° C to 900 ° C over a period of four hours, after it has been held at 900 ° C for 3 hours and then turned off again to cool to room temperature overnight . The heating of the vitrified agglomerates was screened through a 16 mesh screen, to separate another of them and also to remove any fine SAG. The vitrified agglomerates, prepared above, were drip-coated to a weight of 0.093 grams per cm 2 (0.60 grams per square inch) toward and in the phenolic formed resin described above. The bands are placed on an almost circular cube and in an oven at 90 ° C for 90 minutes at 155 ° C for 30 minutes. A phenolic size resin, having the following formulation, is roller coated on the agglomerates: 30.06 parts of RPR, 28.48 parts of DW, 0.37 parts of SCA, 37.34 parts of CMSK, 0.19 parts of 10, 1.21 parts of SWA1 and 0.23 parts of SWA2. The wet weights of the sizing cover are approximately 0.033 grams per cm2 (0.21 grams per square inch). The bands are placed in an oven at 90 ° C for 90 minutes, 105 ° C for 10 hours and at 130 ° C for 3 hours.

Example 6 Example 6 is worked up in the same manner as example 5, except the band used is that of example 4. The invention has been described with reference to various specifications and embodiments and preferred techniques. It should be understood, however, that many varieties and modifications may be made while the spirit and scope of the invention remain.

Claims (10)

1. A manufacturing method in accordance with a coated, flexible abrasive band, characterized in that it comprises the steps of: (a) a backing gauze substrate assembly, without splice, auger having an exposed front surface and a rear surface fitted in a peripheral surface of a temporary support structure; (b) applying a continuous fibrous reinforcement material on the front surface in a plurality of revolutions; (c) applying a coating of a first binder precursor on the front surface; (d) exposing the coating to effective conditions for solidifying the first binder precursor and bonding the fibrous reinforcement material to the front surface to form a reinforced backing without endless splicing; Y (e) applying an abrasive coating comprising abrasive and adhesive particles on the back surface or the reinforced backing surface without endless splicing.

2. The method according to claim 1, characterized in that the continuous fibrous reinforcement material is a strand.

3. The method according to claim 2, characterized in that the fibrous reinforcement material is applied by helical winding to the fibrous strand on the front surface.

4. The method according to claim 1, characterized in that step (c) is conducted before step (b).

5. The method according to claim 1, characterized in that step (e) is conducted before step (a).

6. A manufacturing method in accordance with a flexible, coated abrasive strip, characterized in that it comprises the steps of: (a) a backing gauze substrate assembly, without splice, worm having an exposed front surface and a back surface tightly in a peripheral surface of a temporary support structure; (b) at least the substrate partially saturated with a saturating resin precursor; (c) at least partially curing the saturating resin precursor; (d) applying a coating of a pre-sizing precursor on the front surface; (e) at least partially curing the pre-sizing precursor; (f) applying a fibrous reinforcement material on the front surface in a plurality of revolutions; (g) applying a coating of a first precursor on the front surface; (h) exposing the coating to effective conditions to solidify the first binder precursor and bonding the fibrous reinforcement material to the front surface to form a reinforced backing without endless splicing; Y (i) applying an abrasive coating comprising abrasive and adhesive particles on the back surface or the reinforced backing surface without endless splicing.

The method according to claim 6, characterized in that the gauze substrate is fabric.

8. The method according to claim 6, characterized in that the continuous fibrous reinforcement material is a strand helically wound on the front surface with a strand with a space of about 2 to 50 threads per cm of lateral winding of the front surface.

9. The method of claim 6, characterized in that the helically wound strand substantially covers the complete lateral winding of the front surface.

10. A manufacturing method in accordance with a flexible coated abrasive band characterized in that it comprises the steps of: (a) a backing gauze substrate assembly, without splice, worm having an exposed front surface and a fitted back surface on a peripheral surface of a temporary support structure; (b) at least the substrate partially saturated with a saturating resin precursor; (c) at least the saturating resin precursor is partially cured; (d) applying a coating of a pre-sizing precursor on the front surface; (e) at least partially curing the pre-sizing precursor; (f) applying a fibrous reinforcement layer comprising continuous fibrous reinforcement material and a bonding material on the front surface in a plurality of revolutions; (g) applying an abrasive coating comprising abrasive and adhesive particles on the back surface or the reinforced backrest surface without endless splicing.