EP0333034B1 - Outil de meulage flexible et procédé pour sa fabrication - Google Patents

Outil de meulage flexible et procédé pour sa fabrication Download PDF

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Publication number
EP0333034B1
EP0333034B1 EP89104190A EP89104190A EP0333034B1 EP 0333034 B1 EP0333034 B1 EP 0333034B1 EP 89104190 A EP89104190 A EP 89104190A EP 89104190 A EP89104190 A EP 89104190A EP 0333034 B1 EP0333034 B1 EP 0333034B1
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EP
European Patent Office
Prior art keywords
grinding tool
foamed
finish
tool according
foam
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.)
Expired - Lifetime
Application number
EP89104190A
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German (de)
English (en)
Other versions
EP0333034A1 (fr
Inventor
Angelika Eichler
Günter Jürissen
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.)
Hermes Schleifmittel GmbH and Co KG
Original Assignee
Hermes Schleifmittel GmbH and Co KG
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 Hermes Schleifmittel GmbH and Co KG filed Critical Hermes Schleifmittel GmbH and Co KG
Priority to AT89104190T priority Critical patent/ATE77785T1/de
Publication of EP0333034A1 publication Critical patent/EP0333034A1/fr
Application granted granted Critical
Publication of EP0333034B1 publication Critical patent/EP0333034B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B24D11/02—Backings, e.g. foils, webs, mesh fabrics

Definitions

  • the invention relates to a flexible grinding tool with a flexible base containing a fiber structure, the gaps between which are at least partially filled by equipment which has solidified from the flowable state.
  • the invention further relates to a method for producing such a grinding tool.
  • Textiles that are used to produce the flexible base for grinding tools need to be solidified before the abrasive grain is applied.
  • the equipment is used for this consolidation.
  • the equipment is understood to mean a mass introduced into the textile material in a flowable state, which solidifies therein and thereby connects and solidifies the fibers of the textile structure. It also has the purpose of filling the interstices of fibers and threads of the underlay, at least in the area near the surface, in order to protect them from the penetration of the grain binder, which is undesirable within the underlay because of its embrittling influence. It also protects against the penetration of other undesirable substances, especially grinding aids such as water, grinding emulsion or oil.
  • the equipment Because the equipment is involved in the transfer of forces between the Abrasive grain and the pad as well as within the pad, it must securely anchor on and between the fibers or fiber strands forming the pad. The lower the viscosity in the applied state, the better this is achieved. In other respects, however, low viscosity is undesirable because it is generally synonymous with the presence of significant amounts of solvents or dispersants, which increase the drying effort (energy requirement, dryer length). This can also limit the amount of substance that can be applied. Finally, an excessive depth of penetration caused by low viscosity can bring about disadvantageous changes in the properties of the substrate, for example brittleness of the fibers during finishes based on phenolic resin.
  • the invention is therefore based on the object of creating a grinding tool of the type mentioned, the equipment of which, with good adhesion to the base, has good filling properties and the ability to form a sufficiently thick layer.
  • the invention is also based on the object of providing a method for incorporating such equipment into the base.
  • the solution according to the invention is that the equipment is foamed.
  • the invention is based on the surprising finding that the use of foam reduces the consistency problems explained, because it has two consistencies, so to speak. Even one made of relatively light-bodied material Prepared foam has considerable dimensional stability, which permits the application of a sufficiently thick layer, the mass of the solids remaining after curing and that of the solvent or dispersant to be expelled in the drying process or of the water obtained as a result of chemical reaction being low.
  • the ability of the foam to anchor itself to the fibers and in the interstices of the fibers on the surface of the underlay is, however, influenced by the drainage capacity and by the viscosity of the liquid on which the foam is based, this viscosity being chosen to be comparatively low regardless of the dimensional stability of the foam as a whole can be.
  • the foam structure does not diminish the ability of the liquid forming the foam to penetrate and anchor itself in the interstices of the fibers, especially since it has been shown that the foam tends to increase its density in the lower region bordering the textile surface enlarge because the larger bubbles move away from the base, especially if the application is on the horizontal or inclined path from above. Therefore, the equipment according to the invention is characterized in many cases in that its density at the interface with the base is greater than at a distance from it. At the same time, however, the mass of the liquid freely available in the border area to the textile base is limited. This limits the amount of liquid that can migrate from the foam-filled, larger pores and thread spaces through capillary forces into the fine fiber spaces.
  • a major advantage of the invention is that surface depressions of the base, for example those between fiber strands of textile bases, through Foam equipment can be largely filled. This applies in particular to the gaps between adjacent threads or fiber strands of knitted fabrics. A relatively smooth, flat surface can be achieved even with considerable unevenness of the base.
  • the foam filling can also be involved in the power transmission to the desired extent by the height of the rear foam equipment exceeding that of the fiber strands in the unloaded state, without substantial layer thickness on the fiber strands, a foam of such a resilient consistency being chosen that it is operationally suitable occurring forces (primarily the pressure of the drive rollers and / or the pressure of a pressure beam or pressure shoe used to generate the grinding pressure) is compressed as much as the height of the fiber strands allows. In the area of foam equipment, only a force of the size required for this compression is then transmitted. In this embodiment, a substantial layer thickness is avoided on the fiber strands, so that high forces can be transmitted there regardless of the possibly limited strength of the foam equipment.
  • the foam equipment can form a layer that completely and essentially covers the back (including the fiber strands).
  • This has the advantage of high smoothness on the back side, which has not previously been achieved by conventional methods with a single application - in particular in the case of inexpensive knitted fabrics with a non-uniform and uneven surface or low fabric density could be.
  • the abrasive effect that some conventional underlays have on the sliding surfaces of pressure beams or pressure shoes on grinding machines can be avoided.
  • a foam of medium softness is expediently chosen for the production of a back cover layer and for filling back depressions, namely a foam in which the pressure required for compression to half the thickness is at least 700 kPa and preferably at least 1200 kPa and at most 2500 kPa .
  • the deep fill in which the higher fiber strands are not or hardly covered by a foam layer, is expediently knife-coated, so that the excess located above the highest elevations of the base has been removed and these highest elevations themselves have remained essentially free of coatings.
  • a space filling is formed, the surface of which approximates the height of the fiber strands at the edges of the spaces.
  • the height of the gap filling can be less than the height of the fiber strands if there is a loss of volume after doctoring; it can be as high; however, it can also be bulged higher if the foam rubs after wiping.
  • the calender foam layer is characterized by greater mechanical resistance.
  • the strength of the foam layer cannot withstand the attack of external forces, for example the frictional force of a drive roller or the force of a surface which acts on the back of the sanding belt and generates the sanding pressure
  • the density of the foam equipment when ready for use is preferably on average 0.5 to 0.9 b / cm3, preferably about 0.7 g / cm3.
  • the foam equipment on the back of the abrasive belt has particular advantages, it can also be used on the grain side, namely to fill recesses and fiber strand gaps in the grain-side surface of the underlay to form a smooth surface of the finished underlay for receiving the abrasive grain layer.
  • a very firm foam should be chosen that absorbs the grinding pressure practically incompressibly. This means that the flexibility of the foam-filled areas is so low that it does not affect the grinding result. This condition is at least when the compression of the foam-filled areas of the ready-to-use abrasive belt under the grinding pressure is less than a third of the average abrasive grain size.
  • the equipment foamed according to the invention is the only equipment of the base. Rather, for example, primary equipment can be applied in front of it, which is perceptibly or preferably imperceptibly between the foam equipment and the fibers forming the base. Furthermore, the invention does not exclude that the foam equipment according to the invention is followed by further equipment with foamed or non-foamed material, for example to form a hard or tough top surface before the abrasive grain layer is applied.
  • the advantage of the foam equipment that surface depressions of the underlay are filled not only relates to deep recesses in the surface, but also to open ones that pass from one side to the other of the underlay and are only closed by the foam equipment.
  • the process according to the invention is characterized in that the mass to be introduced as equipment into the base contains a foaming agent. It is not necessary but advantageous that the foam formation takes place at least partially after it has been introduced into the base.
  • Common application techniques can be used. For example, if the consistency is very thin, the base to be finished can be used an immersion bath of the equipment mass is performed, after which the excess is squeezed off by a pair of press rolls.
  • application by means of a doctor blade is advisable. This applies in particular if the surface of the mass is smoothed out at the same height as the highest elevations of the fiber structure of the base.
  • the smoothing expediently takes place after the completion of the foam formation, if the layer is to have the same height as the fiber structures. If, on the other hand, it is desired that the foamed interstice filling should protrude beyond the height of the fiber structures on the back of the underlay, the smoothing is expediently carried out before the completion of the foam formation. Finally, as already mentioned, calendering can take place. This applies in particular to continuous foam layers on the back of the underlay.
  • the filling of interstices on the grain side has the advantage that the grain binder cannot penetrate the substrate. It is therefore also possible to use the less expensive open woven and knitted fabrics without the risk of embrittlement.
  • the flexible grinding tool according to FIG. 1 which can be an abrasive belt, comprises a base 1, the textile part of which is a sewing fabric that consists of a fleece or fiber strands 2 with a direction parallel to the plane of the drawing, perpendicular there are threads or fiber strands 3 and sewing threads 4, by means of which the fiber strands 3 and the layer 2 are connected to one another.
  • a base 1 the textile part of which is a sewing fabric that consists of a fleece or fiber strands 2 with a direction parallel to the plane of the drawing, perpendicular there are threads or fiber strands 3 and sewing threads 4, by means of which the fiber strands 3 and the layer 2 are connected to one another.
  • Such knitted fabrics and their use for flexible grinding tools are known. If fiber structures are generally mentioned above, this preferably means the fiber structures formed by such thread systems.
  • a grain layer formed by grains 6 is connected to the base 1 by means of a binder layer 7 and covered by a post-glue layer 8.
  • the depressions 9 are filled with a plastic foam 10, the surface 11 of which reaches approximately the height of the fiber strands 3 and sewing threads 4 and is even curved slightly beyond them. If it is sufficiently soft to be pressed together by rear forces, such as occur when the belt is pressed against a workpiece, such forces are mainly taken up by the fiber strands 3 or sewing threads 4 that appear in the rear surface of the grinding tool.
  • the foam 10 therefore does not have to have a very high strength and only participates in the transmission of the forces running transversely to the band plane in accordance with its bulging and its modulus of elasticity.
  • the modulus of elasticity to be selected for the foam therefore depends on the forces to be transmitted. It can be very soft if the back pressure forces are to be transmitted mainly through the fiber strands 3, but a high compressive strength can also be selected for the foam if it is to contribute significantly to the transmission of the pressure forces. Its stress can be measured by the degree of its bulge according to its compression up to that of the Fiber strands are limited certain level, which also limits the forces to be transmitted by it in relation to the fiber strands.
  • Any foamable and then solidifying material that develops sufficient adhesion to the base can be used for the foam finishing.
  • It is preferably synthetic resin, in particular phenols, urea and melamine resins and also plastic dispersions based on polyacrylic acid esters, polyvinyl acetate, polyurethane, polyvinyl chloride, polyvinylidene chloride, polyethylene, polyvinyl ether, acrylonitrile-butadiene-styrene copolymer and polyvinyl propionate, their copolymers, copolymers or terpolymers in each case exclusively or a combination of any proportions of these polymers.
  • the foam formed by the plastic dispersion can contain surfactants, foaming agents, foam stabilizers, dyes and fillers, crosslinking agents, chemical blowing agents and auxiliaries for setting the desired pH.
  • the foam-forming gas can be introduced mechanically as air, nitrogen, carbon dioxide or the like or can be generated by chemical reaction within the liquid on which the foam is based.
  • the designation of the substance on which the foam is based as flowable should not preclude the use of viscous substances, provided that the foam as a whole is at least spreadable.
  • the density of the foam when applied is advantageously between 0.1 and 0.4 g / cm3, preferably between 0.15 and 0.3 g / cm3.
  • the viscosity of the foam is expediently between 3000 and 10000 mPa.s.
  • the viscosity of the liquid forming the foam is advantageously between 50 and 1500 mPa.s.
  • the application weight of the foam (in the dry state) is advantageously between 10 and 300 g / m2, preferably between 75 and 150 g / m2.
  • the consistency of the ready-to-use foam equipment is best characterized by the compressibility, namely the force required to compress to half its thickness.
  • This force is expediently between 700 and 2500 kPa with the preferred levels given above.
  • the not yet solidified foam is applied to the back of the base and the excess is scraped off by means of a doctor knife in a relative movement running in the direction of the fiber strands 3.
  • the foam mass located on the fiber strands 3 and sewing threads 4 is essentially removed and only the mass 10 remaining in the interstices 9 remains. This can subsequently expand a little as a result of rheological processes during doctoring or due to continuous expansion and - as in 11 - bulge up a little. This is not necessary.
  • the surface 11 is, on the contrary, curved a little concave in order to step behind the surfaces of the comparatively firm ribs formed by the fiber strands 3 and sewing threads 4.
  • the threads 13 enclose open spaces 14 with one another.
  • the threads running transversely to the threads 13 are spaced apart.
  • the gaps 14 are filled with foam equipment 15 according to the invention.
  • a firm layer 16 or 17 can then be applied on the front side and, if appropriate, also on the back. Subsequently the binder layer 18, the grain 19 and the post-glue layer 20 are applied.
  • FIG. 3 shows an embodiment which differs from that according to FIG. 1 in that a rear foam layer 18 is provided which has a considerable thickness, preferably between 0.2 and 1 mm, more preferably between 0.3 and 0, 6 mm.
  • a knitted fabric with a basis weight of 260 g / m2 was first provided with a basic finish and then provided on the back with a foam coating by means of a roller doctor blade with a free gap between the roller doctor blade and the underlay surface of 0.75 mm.
  • the order quantity was 75 g / m2.
  • the remaining layer was calendered using a steel paper roll under a line pressure of 50 daN / cm at a roll temperature of 170 ° C. Condensation then took place at 150 ° C.
  • the grain side was treated conventionally.
  • the applied foam consisted of a foamed, synthetic resin-containing, aqueous plastic dispersion, namely containing 33.3% by weight of Dicrylan 7326 (Chem. Fabrik Pfersee) Acrylic ester copolymer self-crosslinking, 50.0% by weight of Dicrylan 7331 (from Chem. Fabrik Pfersee) Acrylic ester copolymer, 4.2% by weight Knittex CR (Chem. Fabrik Pfersee) Ethylene urea triazine resin, 4.2% by weight of helizarin white AM (BASF) dye, 8.3% by weight of dicrylan stabilizer 7320 (Chem. Fabrik Pfersee) foam stabilizer.
  • the foam density was 0.225 g / cm3.

Claims (19)

1. Outil de meulage flexible, comprenant un support flexible (1) qui contient une structure fibreuse et dont les intervalles (9) sont remplis au moins en partie d'un apprêt (10) solidifié à partir de l'état fluide, caractérisé en ce que l'apprêt est moussé.
2. Outil de meulage selon la revendication, 1, caractérisé en ce que la densité de l'apprêt moussé est plus élevée à la surface du support (1) qu'à distance de celle-ci.
3. Outil de meulage selon la revendication 1 ou 2, caractérisé en ce que le support (1) présente, à sa surface, entre les cordons de fibres (3), des creux (9) qui sont pratiquement remplis de l'apprêt moussé (10).
4. Outil de meulage selon la revendication 3, caractérisé en ce que, du côté arrière du support, l'apprêt moussé n'est disposé pratiquement qu'entre les cordons de fibres (3) sans épaisseur de couche appréciable sur les cordons de fibres, et en ce que la hauteur de l'apprêt moussé (10) entre les cordons de fibres (3) à l'état non chargé est plus grande que la hauteur des cordons de fibres (3).
5. Outil de meulage selon la revendication 4, caractérisé en ce que l'apprêt moussé est compressible, au moins jusqu'à la hauteur des cordons de fibres (3), sous l'effet des pressions d'entraînement et/ou de meulage.
6. Outil de meulage selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'apprêt moussé forme une couche (18) qui recouvre de façon pratiquement complète le coté arrière.
7. Outil de meulage selon l'une quelconque des revendications 4 à 6, caractérisé en ce que la pression nécessaire pour comprimer l'apprêt moussé à la moitié de son épaisseur s'élève au moins à 700 kPa.
8. Outil de meulage selon l'une quelconque des revendication 1 à 3, caractérisé en ce que l'apprêt qui se trouve du côté grains du support et qui est moussé est pratiquement incompressible sous l'effet de la pression de meulage.
9. Outil de meulage selon l'une quelconque des revendications 1 à 8, caractérisé en ce que l'apprêt moussé forme une surface lisse.
10. Outil de meulage selon la revendication 9, caractérisé en ce que la densité d'une couche de l'apprêt moussé du côté arrière, à proximité de la surface libre de celui-ci, est plus élevée qu'à distance de cette surface.
11. Outil de meulage selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la densité de l'apprêt moussé s'élève en moyenne à plus de 0,5 g/cm³ environ.
12. Outil de meulage selon l'une quelconque des revendications 1 à 11, caractérisé en ce que la densité de l'apprêt moussé est inférieur en moyenne à 0,9 g/cm³ environ.
13. Outil de meulage selon l'une quelconque des revendications 1 à 12, caractérisé en ce qu'à la surface du support, l'apprêt moussé est recouvert d'une couche (17) de plus grande résistance.
14. Procédé de remplissage et d'apprêtage d'un support d'outil de meulage flexible par application d'une masse fluide solidifiable, caractérisé en ce que la masse contient un agent moussant.
15. Procédé selon la revendication 14, caractérisé en ce que la formation de mousse se produit au moins partiellement après l'application de la masse dans le support.
16. Procédé selon la revendication 14 ou 15, caractérisé en ce que la surface de la masse est lissée à la même hauteur que les sommets les plus élevés de la structure fibreuse du support.
17. Procédé selon la revendication 16, caractérisé en ce que le lissage est effectué après l'achèvement de la formation de mousse.
18. Procédé selon la revendication 16, caractérisé en ce que le lissage est effectué avant l'achèvement de la formation de mousse.
19. Procédé selon la revendication 14, caractérisé en ce qu'une couche de mousse du côté arrière est calandrée après la formation de mousse.
EP89104190A 1988-03-14 1989-03-09 Outil de meulage flexible et procédé pour sa fabrication Expired - Lifetime EP0333034B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89104190T ATE77785T1 (de) 1988-03-14 1989-03-09 Flexibles schleifwerkzeug und verfahren zu seiner herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8803413U DE8803413U1 (fr) 1988-03-14 1988-03-14
DE8803413U 1988-03-14

Publications (2)

Publication Number Publication Date
EP0333034A1 EP0333034A1 (fr) 1989-09-20
EP0333034B1 true EP0333034B1 (fr) 1992-07-01

Family

ID=6821815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104190A Expired - Lifetime EP0333034B1 (fr) 1988-03-14 1989-03-09 Outil de meulage flexible et procédé pour sa fabrication

Country Status (6)

Country Link
US (1) US4964884A (fr)
EP (1) EP0333034B1 (fr)
AT (1) ATE77785T1 (fr)
CA (1) CA1324888C (fr)
DE (2) DE8803413U1 (fr)
ES (1) ES2034443T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003064110A1 (fr) * 2002-01-31 2003-08-07 Ultimate Manufacturing Limited Article abrasif et procede de fabrication

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049165B1 (en) * 1989-01-30 1995-09-26 Ultimate Abrasive Syst Inc Composite material
US5131924A (en) * 1990-02-02 1992-07-21 Wiand Ronald C Abrasive sheet and method
US5203881A (en) * 1990-02-02 1993-04-20 Wiand Ronald C Abrasive sheet and method
DE4106005A1 (de) * 1991-02-26 1992-08-27 Winter & Sohn Ernst Schleif- oder trennwerkzeug und verfahren seiner herstellung
JP2797286B2 (ja) * 1993-09-01 1998-09-17 建光産業株式会社 研磨用メディアの製造方法
US7094140B2 (en) 2003-06-03 2006-08-22 Onfloor Technologies, L.L.C. Abrasive sanding surface
DE102019218562A1 (de) * 2019-11-29 2021-06-02 Robert Bosch Gmbh Schaumschleifmittel und Verfahren zur Herstellung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB900867A (en) * 1959-07-27 1962-07-11 George Conrad Riegger Sandpaper
US4038047A (en) * 1969-04-14 1977-07-26 Norton Company Method of making a flexible resilient abrasive
US4255164A (en) * 1979-04-30 1981-03-10 Minnesota Mining And Manufacturing Company Fining sheet and method of making and using the same
US4437865A (en) * 1982-08-27 1984-03-20 Carborundum Abrasive Company Flexible backing material for use in coated abrasives
US4543106A (en) * 1984-06-25 1985-09-24 Carborundum Abrasives Company Coated abrasive product containing hollow microspheres beneath the abrasive grain
US4629473A (en) * 1985-06-26 1986-12-16 Norton Company Resilient abrasive polishing product

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003064110A1 (fr) * 2002-01-31 2003-08-07 Ultimate Manufacturing Limited Article abrasif et procede de fabrication

Also Published As

Publication number Publication date
DE8803413U1 (fr) 1989-07-13
ES2034443T3 (es) 1993-04-01
ATE77785T1 (de) 1992-07-15
DE58901751D1 (de) 1992-08-06
US4964884A (en) 1990-10-23
EP0333034A1 (fr) 1989-09-20
CA1324888C (fr) 1993-12-07

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