EP1666204A1 - Produit abrasif - Google Patents

Produit abrasif Download PDF

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Publication number
EP1666204A1
EP1666204A1 EP04027260A EP04027260A EP1666204A1 EP 1666204 A1 EP1666204 A1 EP 1666204A1 EP 04027260 A EP04027260 A EP 04027260A EP 04027260 A EP04027260 A EP 04027260A EP 1666204 A1 EP1666204 A1 EP 1666204A1
Authority
EP
European Patent Office
Prior art keywords
abrasive
mineral
binder
product according
pad
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04027260A
Other languages
German (de)
English (en)
Inventor
Donat Frei
Adrian Schoch
Franz Tanner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sia Abrasives Industries AG
Original Assignee
Sia Abrasives Industries AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sia Abrasives Industries AG filed Critical Sia Abrasives Industries AG
Priority to EP04027260A priority Critical patent/EP1666204A1/fr
Publication of EP1666204A1 publication Critical patent/EP1666204A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B24D11/001—Manufacture of flexible abrasive materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • B24D13/12—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising assemblies of felted or spongy material, e.g. felt, steel wool, foamed latex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
    • B24D13/147—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face comprising assemblies of felted or spongy material; comprising pads surrounded by a flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/001—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as supporting member
    • B24D3/002—Flexible supporting members, e.g. paper, woven, plastic materials

Definitions

  • the present invention relates to a sanding product having a treated and / or coated nonwoven backing in a particular manner.
  • abrasive products are coated with a dust-repellent layer of, for example, stearate.
  • a dust-repellent layer of, for example, stearate.
  • this layer wears away over time and therefore loses its protective effect.
  • EP-A-0 779 851 Another abrasive product is described in EP-A-0 779 851. This comprises a coated knitted fabric with comparatively complicated provided loops or thread ends for receiving the abrasive mineral or for Velcro attachment. A compaction of the substrate to obtain different hardnesses is not possible.
  • abrasive products are known with documents from relatively thick webs of needled plastic fibers.
  • a binder is provided, in which by means of gravity an abrasive mineral is introduced. Due to their structure, these products have an irregular and uneven surface and therefore have a limited grinding performance.
  • the large thickness leads to that these products are too compact and stiff to allow effective dust extraction. For this reason, abrasive products are used only for matting of materials, but not for ablation.
  • these products can not be anchored directly to a Velcro layer, ie an additional Velcro layer must be provided on the abrasive product.
  • the present invention comprises a sanding product comprising a needle-punched nonwoven abrasive pad and a slip mineral applied unilaterally to the pad, the pad being compacted to up to 5% of its original thickness.
  • the manufacture of needled nonwovens is known.
  • the needle-punching takes place on a needle-shaped chair, which mechanically compresses a non-woven fabric presented longitudinally, transversely and diagonally on a carding machine and solidifies it by needle punching.
  • the many thousand needles on the needle board which are provided with small barbs on the side, pierce the nonwoven fabric downwards, whereby the fibers are entrained and crossed and solidified by up and down movements of the needles, similar to a milling process.
  • the degree of compaction is determined by the number of stitches per unit area and penetration depth of the needles into the nonwoven fabric.
  • the resulting fiber structures are permeable to air. A dust extraction is so well possible.
  • the resulting needled fleece is able to anchor itself directly on a hook and loop fastener.
  • the needlepunched nonwoven fabric is preferably made from a polyamide such as nylon or from a polyester. It is also possible to use mixed fibers, preferably from the aforementioned materials. It is still possible to use a needle-punched non-woven consisting of layers of different fibers.
  • the needle felt should have a basis weight of 25 to 300 g / m 2 , preferably 35 to 150 g / m 2 and more preferably 50 to 120 g / m 2 .
  • the pad is deformed under pressure and optionally additionally under the action of heat such that a denser, more compact material is obtained.
  • Such methods are known. For example, mention may be made of calendering or sealing (application of binders to the surface).
  • the backing material is pressed under a pressure of preferably 1 kg to 50 tons per DIN A4 sheet, for example with a metal plate.
  • a pressure of preferably 1 kg to 50 tons per DIN A4 sheet, for example with a metal plate.
  • this is carried out at an elevated temperature of for example 75 to 200 ° C, preferably from 75 to 170 ° C. Adjustments to these conditions may be routine for those skilled in the art.
  • the compaction can be carried out at lower pressures, but over a longer period.
  • the material undergoes a reduction in thickness of up to 95%, preferably from 50 to 90%.
  • the pad of the inventive abrasive product thus undergoes a reduction to up to 5% of the original thickness.
  • Compaction can also be expressed in terms of density (also referred to as bulk density), ie the mass (in this case the weight per unit area) of the product per volume.
  • a conventionally available needle felt has a thickness of about 7 mm. This corresponds to a density of 3.6 kg / m 3 to 42.9 kg / m 3 in the above-mentioned basis weights of 25 to 300 g / m 2 .
  • the needle felt is preferably 1 mm and thus to a density of 25 kg / m 3 to 300 kg / m 3 , preferably from 35 to kg / m 3 to 150 kg / m 3 and particularly preferably from 50 kg / m 3 to 120 kg / m 3 compacted.
  • the compaction of the needle-punched pad is thus manifested by a reduced thickness compared with a conventional needle-punched nonwoven with increased density and increased uniformity of the surface.
  • the original material is a thick soft product.
  • the compaction results in a thin, harder and thus more aggressive abrasive product. This has a uniform flat surface. As a result, more abrasive mineral comes in contact with the workpiece to be machined, resulting in an increased abrasive effect.
  • the hardness of the abrasive product can be adjusted exactly according to existing needs. This is not possible with conventional abrasive products.
  • the variations of the compaction process and the associated adjustment of material properties are routine in the art.
  • the abrasive mineral can therefore be applied by conventional methods such as dip coating to a grinding pad which is compacted according to the invention.
  • the application of the abrasive mineral by electrostatic scattering preferably takes place in the product according to the invention.
  • Electrostatic spreading systems can do without mechanical atomization.
  • the material to be applied in this case the abrasive mineral, is passed as a layer through a high voltage field.
  • the material is charged, accelerated and adheres to the prepared binder film.
  • the transport of the grinding mineral to the workpiece to be coated is done by the voltage differences between the spreading system and the workpiece.
  • a binder layer is preferably applied to a surface of the needle felt.
  • conventional binders such as resins and dispersions based on phenolic resin, urea resin, melamine resin, epoxy resin, polyester resin, urethane, acrylate or styrene-butadiene can be used.
  • the binder is applied in a conventional manner, for example by spraying, dipping or by transferring a pre-metered quantity of binder onto the nonwoven on a roll.
  • abrasive mineral conventional abrasive minerals such as all types of corundum including zirconia corundum and ceramic corundum, silicon carbide, garnet, flint or lubricating gel can be used.
  • the abrasive mineral preferably has a particle size between P40 and P2000.
  • an abrasive product having a needle-punched nonwoven backing and an abrasive mineral applied by electrostatic scattering already has an improved abrasive effect with good dust extraction. Due to the orientation of the abrasive mineral, electrostatic spreading gives a more aggressive product.
  • the abrasive product with a compacted needle felt as a sanding pad it is not necessary to scatter the abrasive mineral electrostatically.
  • An adjustment of the aggressiveness can be achieved in the inventive abrasive product with compacted abrasive backing by the application: spraying a suspension of binder and abrasive mineral, you get a slightly less aggressive product than if you scatter the abrasive mineral in a binder layer located on the substrate electrostatically.
  • the abrasive mineral-containing binder layer is preferably coated with a further layer of binder in order to better fix the abrasive mineral.
  • This second layer may consist of the same binders listed above.
  • a sanding product comprising both a compacted needled nonwoven abrasive pad and abrasive grit applied on one of the surfaces of the abrasive pad.
  • the compaction according to the present invention can be carried out before or after the coating of the abrasive substrate with binder and abrasive mineral. Preferably, however, the compaction is carried out before the coating.
  • an open structure abrasive product is obtained.
  • the inventive abrasive product thus does not clog while the grinding process, since the grinding dust can be sucked through the abrasive product through, for example by means of a conventional grinding machine with a conventional grinding disc. This results in a significantly longer service life of the inventive abrasive product.
  • the inventive abrasive product is able to anchor directly on a conventional, equipped with Velcro sanding pad.
  • the otherwise required application of an additional velor layer as a counterpart to the Velcro on the sanding pad is therefore eliminated.
  • the elimination of this otherwise required additional velor layer also facilitates the suction of the grinding dust through the abrasive product and also contributes to the improved abrasive effect.
  • the abrasive product according to the invention has no firm support, in particular in the case of the embodiment with a compacted sanding pad, and is therefore very flexible.
  • the fibers on the one surface of the inventive abrasive product are coated with abrasive mineral.
  • abrasive mineral due to the flexibility of the backing, new coated portions of the abrasive product with unused abrasive mineral are continually coming into contact with the workpiece to be machined. This considerably increases the grinding effect.
  • a dust-repellent layer of, for example, stearate.
  • a dust-repellent layer can be additionally provided.
  • the inventive abrasive product is suitable for wet and / or dry grinding. It is particularly suitable for processing lacquer and color layers or in general for substrates in the processing of which an abrasive product tends to become clogged.
  • a needle felt having a basis weight of 75 g / m 2 and a thickness of 6 mm (density of 12.5 kg / m 3 ) was coated at about 160 ° C with a metal roller and thus subjected to a pressure of about 30 tons.
  • the thus compacted to a thickness of 0.3 mm and a density of 250 kg / m 3 product was coated on one of its surfaces with a layer of binder.
  • the abrasive mineral was applied by electrostatic scattering.
  • the abrasive mineral-containing binder layer was coated with a second binder layer. Abrasive grain and binder were applied so that the back of the needle felt was not coated. The back had the property of that she adhered without additional velor directly on a Velcro-coated pad.
  • FIG. 1 The resulting abrasive product is shown in Figures 1 to 3. From Fig. 1, the occupation of a surface of the abrasive pad with electrostatically interspersed abrasive mineral is visible. From Fig. 2 it can be seen that the abrasive product has a very open, porous structure, whereby an effective suction of grinding dust through the abrasive product is possible.
  • Fig. 3 shows a side view of the abrasive product. The top is coated with abrasive mineral, while the bottom is uncoated and has the structure required for direct anchorage with a hook and loop fastener.
  • the abrasive product according to Example 1 was subjected to a comparison test with a conventional grinding wheel (paper grinding wheel with 7 holes of the type 1961 Siarexx Cut). As can be seen from FIG. 4, the grinding effect of the conventional standard grinding wheel fell faster and more sharply than the grinding action of the product according to the invention.
  • Example 1 was repeated except that the abrasive mineral was placed in a binder matrix and applied to one of the surfaces of the abrasive pad.
  • the product obtained showed a slightly less aggressive abrasive action than the product according to Example 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP04027260A 2004-11-17 2004-11-17 Produit abrasif Withdrawn EP1666204A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04027260A EP1666204A1 (fr) 2004-11-17 2004-11-17 Produit abrasif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04027260A EP1666204A1 (fr) 2004-11-17 2004-11-17 Produit abrasif

Publications (1)

Publication Number Publication Date
EP1666204A1 true EP1666204A1 (fr) 2006-06-07

Family

ID=34927422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04027260A Withdrawn EP1666204A1 (fr) 2004-11-17 2004-11-17 Produit abrasif

Country Status (1)

Country Link
EP (1) EP1666204A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCR20100028A1 (it) * 2010-09-01 2012-03-02 Paolo Corazzi Fibre S R L Materiale composito abrasivo a strati sovrapposti
DE102012201186A1 (de) 2011-03-31 2012-10-04 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät zum Trocknen eines Gutes, umfassend eine Filteranordnung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1006005A (en) * 1961-06-14 1965-09-29 Armour & Co Improvements in or relating to abrasive articles
DE8810629U1 (de) * 1988-08-22 1988-09-29 Norddeutsche Schleifmittel-Industrie Christiansen & Co (GmbH & Co), 2000 Hamburg Schleifvlieswerkzeug mit Kletthaftrückseite
EP0781629A1 (fr) * 1995-12-29 1997-07-02 Peter Jöst Elément abrasif adaptable directement ou indirectement à une machine ou à un support d'abrasif actionné manuellement ainsi qu'un adaptateur approprié
EP1113099A2 (fr) * 2000-01-03 2001-07-04 Freudenberg Nonwovens Limited Partnership Matériau non-tissé pour le polissage ou l'aplanissement qui possède une solidité et une stabilité dimensionnelle améliorées
EP1186379A2 (fr) * 2000-09-07 2002-03-13 Tholes srl Dispositif de meulage et de ponçage de surface

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1006005A (en) * 1961-06-14 1965-09-29 Armour & Co Improvements in or relating to abrasive articles
DE8810629U1 (de) * 1988-08-22 1988-09-29 Norddeutsche Schleifmittel-Industrie Christiansen & Co (GmbH & Co), 2000 Hamburg Schleifvlieswerkzeug mit Kletthaftrückseite
EP0781629A1 (fr) * 1995-12-29 1997-07-02 Peter Jöst Elément abrasif adaptable directement ou indirectement à une machine ou à un support d'abrasif actionné manuellement ainsi qu'un adaptateur approprié
EP1113099A2 (fr) * 2000-01-03 2001-07-04 Freudenberg Nonwovens Limited Partnership Matériau non-tissé pour le polissage ou l'aplanissement qui possède une solidité et une stabilité dimensionnelle améliorées
EP1186379A2 (fr) * 2000-09-07 2002-03-13 Tholes srl Dispositif de meulage et de ponçage de surface

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCR20100028A1 (it) * 2010-09-01 2012-03-02 Paolo Corazzi Fibre S R L Materiale composito abrasivo a strati sovrapposti
WO2012028924A1 (fr) 2010-09-01 2012-03-08 Paolo Corazzi Fibre Srl Matériau composite abrasif ayant des couches se recouvrant
DE102012201186A1 (de) 2011-03-31 2012-10-04 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät zum Trocknen eines Gutes, umfassend eine Filteranordnung

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