EP3482878A1 - Support d'abrasif - Google Patents

Support d'abrasif Download PDF

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Publication number
EP3482878A1
EP3482878A1 EP18205993.1A EP18205993A EP3482878A1 EP 3482878 A1 EP3482878 A1 EP 3482878A1 EP 18205993 A EP18205993 A EP 18205993A EP 3482878 A1 EP3482878 A1 EP 3482878A1
Authority
EP
European Patent Office
Prior art keywords
paper
abrasive
abrasive carrier
carrier according
scrim
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Withdrawn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
EP18205993.1A
Other languages
German (de)
English (en)
Inventor
Heinz Gillandt
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.)
Cordier Spezialpapier GmbH
Original Assignee
Cordier Spezialpapier GmbH
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 Cordier Spezialpapier GmbH filed Critical Cordier Spezialpapier GmbH
Publication of EP3482878A1 publication Critical patent/EP3482878A1/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Withdrawn legal-status Critical Current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
    • B24D11/02—Backings, e.g. foils, webs, mesh fabrics
    • 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
    • B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses

Definitions

  • the invention relates to an abrasive carrier and a method for producing the abrasive carrier.
  • Abrasive carriers are usually multi-layer sandwich constructions, typically with a core or a middle layer and outer layers of fabric.
  • a disadvantage is the uneven surface of the fabric, which allows only the application of coarse abrasive grain.
  • Another disadvantage is the high basis weight or the high material usage, which is necessary for abrasive carrier using tissue, especially if the abrasive carrier is to be used for industrial applications.
  • sandwich constructions using paper For simple applications with low load, eg. As for hand-operated grinders, there are also sandwich constructions using paper.
  • paper abrasive media are not for industrial use, eg. B. used for grinding wood-based panels, because the strength of the abrasive carrier is not sufficiently high.
  • the abrasive carrier according to the invention comprises a first paper on the running side, a scrim of fibers and a second paper on the abrasive grain side, wherein the first paper, the scrim and the second paper are each connected to each other by an at least partially applied layer of a bonding agent.
  • the abrasive carrier according to the invention is preferably a flat or designed as a circulating belt sandwich element. It can, for. B. in a size of up to 2800 mm x 2300 mm are produced. This makes it suitable for use in industrial grinding systems.
  • the clutch is flat and forms the middle layer of the abrasive carrier. It preferably has in each case an X-thread, which is aligned in the running direction of the abrasive carrier, a Y-thread which is oriented perpendicular to the running direction and thus to the X-thread, and at least one first XY thread.
  • the XY thread is oriented in the surface at an angle not equal to 90 ° to the direction and to a direction perpendicular to the direction; The XY thread thus runs obliquely to the X and Y thread.
  • the scrim of the abrasive carrier on a second XY thread is aligned in the running direction of the abrasive carrier, a Y-thread which is oriented perpendicular to the running direction and thus to the X-thread, and at least one first XY thread.
  • the XY thread is oriented in the surface at an angle not equal to 90 ° to the direction and to a
  • the second XY thread is oriented in the surface at an angle to the X-thread, the Y-thread and the first XY thread, which deviates from 90 °.
  • the angle ⁇ between the X-thread and the XY thread is preferably 5 ° to 85 °, particularly preferably 30 ° to 60 °.
  • the first and the second XY yarn are arranged at an angle of 5 ° to 85 °, preferably from 20 ° to 70 °, preferably at an angle of more than 30 ° to each other.
  • the first and second XY yarns are at an angle of 55 ° to 75 ° to each other;
  • the clutch contributes particularly effective to increase the tear and tear propagation resistance.
  • the X-threads arranged in parallel such a fabric has a length which is fixed in the longitudinal direction or in the case of a circulating abrasive carrier in the running direction.
  • the Y-threads stabilize the width of the abrasive carrier.
  • the one or more XY threads absorb lateral forces; they thus increase the tear and tear propagation resistance, properties that are particularly required in an industrially used abrasive carrier.
  • the angle in particular between the first and the second XY thread can be adjusted within wide limits individually to the requirements of the respective abrasive. Also by the number of X, Y and XY threads per surface and the diameter of the threads, the strength properties of the Geleges can be adjusted.
  • the abrasive carrier according to the invention has threads in the context, which are made of natural, synthetic, mineral or ceramic fibers. It can fibers of vegetable material such. As cotton, jute or flax fibers are used, but also synthetic fibers from z. As polyester, polyamide, viscose, polyethylene or polypropylene. Also suitable are carbon fibers such. As carbon fibers or ceramic or mineral or metallic fibers, for. B. steel fiber yarns. Suitable are also threads or yarns for the preparation of the Geleges, which are made of a combination of the above materials. Preferably, the threads used to make the scrims have only minimal elongation, e.g. B. after the threads were stretched. The preferred threads for producing the jelly have a diameter of 90 ⁇ m to 150 ⁇ m.
  • the abrasive carrier preferably has a scrim with a weight of 15 g / m 2 to 25 g / m 2 .
  • an abrasive carrier comprising a scrim, in which a maximum of three threads of the scrim intersect at a crossing point.
  • a scrim that creates no shifts of the threads, neither in the longitudinal or running direction nor in a direction perpendicular to it.
  • Such a scrim causes a special tear and tear propagation resistance.
  • an abrasive carrier in which the threads of the fabric are connected to one another at a crossing point.
  • the threads of the fabric may also be partially fused together or the intersection of the fabric has a means for fixing, in particular an adhesive, typically a hotmelt such.
  • an adhesive typically a hotmelt such.
  • EVA ethylene vinyl acetate
  • an abrasive carrier in which the first and the second paper are produced from a pulp having the strongest possible fibers or fibers with a high dynamic strength, preferably a long fiber pulp, in particular from softwood long fiber pulp.
  • a pulp having the strongest possible fibers or fibers with a high dynamic strength preferably a long fiber pulp, in particular from softwood long fiber pulp.
  • Kraft or sulfate pulp is used.
  • the pulp used to make the first and second papers is selected primarily from the standpoint of strength properties; the pulp is selected so that tear strength, breaking load, tear propagation and bursting pressure are as high as possible.
  • the first and the second paper of the abrasive carrier is made of a pulp having a freeness of 15 ° SR to 35 ° SR, preferably a freeness of 20 ° SR to 30 ° SR;
  • the degree of grinding is optimized so that a maximum strength level of the fibers of the pulp is achieved.
  • the degree of grinding SR (Schopper-Riegler) is measured according to DIN EN ISO 6267.
  • guar gum causes a significant increase in the OH groups on the surface of the fibers and thus contributes to an increased strength, which would alternatively be achieved only by grinding to 4 ° SR to 50 ° SR, but with considerable reduction of the fibers, which is undesirable. Longer fibers, which are still present during grinding at only 20 ° SR to 30 ° SR, have a positive effect on tear propagation. The tear propagation is in the context of abrasive carriers of particular interest or of particular advantage. In order to effect the increase in the OH groups, it is customary to add from 0.5% by weight to 5% by weight, preferably from 0.5% by weight to 1% by weight, of guar gum based on the fibrous material used.
  • the first and the second paper are sized in the mass to produce the abrasive carrier, that is, the glue which combines the fibers into a paper is already added to the aqueous suspension of the fibers.
  • the glue which combines the fibers into a paper is already added to the aqueous suspension of the fibers.
  • the paper has a good dimensional stability which is advantageous for use as an abrasive carrier, and the paper also excellently resists the high shear forces that build up when the first paper is accelerated on the running side while the second paper passes through on the abrasive grain side the grinding process is slowed down.
  • both papers of the abrasive carrier are subjected to high shear forces which, however, according to the invention, as far as the first and second papers are concerned, are absorbed by the combination of the high strength fibers of the pulp and the glue.
  • thermoplastic for. B. added a styrene-butadiene-acrylonitrile terpolymer in an amount of 5-15% based on the fiber amount of the pulp suspension prior to sheet formation, to further increase the strength of the fiber composite in the paper.
  • the thermoplastic advantageously has a glass transition temperature of 30 ° C to 40 ° C.
  • the sized in the mass first and second paper has after addition of the thermoplastic, a particularly high gap strength and in particular a good peel adhesion. This is particularly advantageous with the high shear forces that occur when using the abrasive carrier.
  • the engine sizing is unusual for abrasive carriers. You compared to surface sizing easier and cheaper, because elaborate coating devices can be omitted.
  • excellent strength properties and other necessary properties are also achieved by means of a paper sized in the mass.
  • the abrasive carrier according to the invention is produced by mixing the abovementioned constituents of the formulation in aqueous solution, followed by grinding, followed by the actual papermaking.
  • the use of ready-milled fibers and the subsequent mixing of the abovementioned components in aqueous solution and the subsequent papermaking according to a second alternative also lead to the abrasive carrier according to the invention.
  • the abrasive carrier of the present invention optionally includes first and second papers, one or both of which are surface sized.
  • the surface sizing is carried out in addition to the sizing in the mass and optionally the addition of a thermoplastic.
  • a surface sizing is achieved in the context of the invention that the surface is sealed and smoothed.
  • the sealing prevents the binder to be applied to the outer surface of the second paper, usually a synthetic resin, from sagging in the Z direction, that is to say into the second paper and thus no longer being available for binding the abrasive grain.
  • the smoothing creates a particularly flat surface of the abrasive carrier, so that even the finest abrasive grain can be applied. It is thus possible to work with the finest abrasive grain even in industrial grinding systems and to produce correspondingly smooth and high-quality surfaces.
  • gluing agent for surface sizing z As a gluing agent for surface sizing z. As a styrene-acrylate or a nitrile-butadiene or copolymers thereof can be used. Preferably, the gluing agent has a glass transition temperature of less than zero.
  • solid particles are added according to a preferred embodiment of surface sizing of the first paper.
  • the solid particles advantageously have a Mohs hardness of more than 3, preferably between 4 and 9.
  • Well suited are silica or alumina, which are used with a particle size of 0.02 microns to 0.04 microns. In this way, the running characteristics of the abrasive carrier are greatly improved and slippage of the abrasive carrier on the drive rollers of an industrial grinder is minimized.
  • the dimensional stability is also improved by the use of the solid particles.
  • the abrasive carrier according to the invention has a sheet weight of the first and second paper which is at least 80 g / m 2 , preferably between 150 g / m 2 and 250 g / m 2 .
  • the abrasive carrier according to the invention is particularly light and high strength by the measures described above. It can therefore be used not only in hand-operated grinding devices but also in industrial grinding systems.
  • the first and the second paper are constructed largely the same and differ only in the optional surface sizing, according to an advantageous embodiment of the invention, at least one paper is dyed in order to better distinguish the first and the second paper in the manufacture of the abrasive carrier.
  • the abrasive carrier according to the invention is characterized by the known per se application of abrasive grain with a binder to the second paper to an industrially usable abrasive.
  • the scrim is prepared separately and first and second paper and scrims are subsequently bonded to form a sandwich by use of a bonding agent.
  • the bonding agent used to make the abrasive backing is preferably a thermoplastic. It can be any synthetic resin such. As an acrylate or urethane, but particularly preferred is a hot melt adhesive such. As a polyamide, polyolefin, polyethylene, ethylene vinyl acetate or copolymers thereof. Hotmelt adhesives, which melt in a temperature range of approx. 120 ° C to 200 ° C, can be processed without much energy expenditure. In a softened state they enclose upon application of pressure, eg. During passage of a calender or the like, both fibers of the paper adjacent to the scrim and the threads of the scrim.
  • the hot melt adhesive is applied in sections. However, preference is given to an area-covering application, in each case between the first paper and the scrim and the scrim and the second paper. Due to the mass of the hot melt adhesive, the strength properties are further improved.
  • the hotmelt adhesive helps to absorb shear forces better.
  • the amount of bonding agent used is preferably between 15 g / m 2 and 70 g / m 2 , particularly advantageously between 30 g / m 2 and 50 g / m 2 .
  • the first paper, the scrim, and the second paper are preferably bonded to an abrasive carrier by use of pressure and temperature with the bonding agent. While the temperature is usually determined by the processing temperature of the bonding agent, the required pressure, which is necessary for joining the papers with the scrim, is determined and optimized by a few tests. It is usually between 3.5 bar and 5 bar. In this way, a sandwich product with firmly interconnected layers, which is light, dimensionally stable, high strength and thus suitable to produce on industrial grinding equipment, eg. B. to be used for grinding wood-based surfaces.
  • Fig. 1 a scrim that is used for the abrasive carrier according to the invention.
  • a first and a second paper made of pine long fiber pulp having a freeness of 25 ° SR is produced.
  • the leaf weight is 170 g / m 2 .
  • To the aqueous suspension of the pulp fibers is added 1.5% by weight of cationically reinforced rosin for sizing the paper to be prepared and 120% by weight of the rosin of aluminum sulfate as a retention aid and to aid in sizing. Further, 10% by weight of a styrene-butadiene-acrylonitrile terpolymer having a glass transition temperature of 35 ° C is added.
  • the deposition of the terpolymer on the pulp fibers is assisted by the use of a cationic precipitant, here a polyakylamine, which is used in an amount of 3 wt .-% based on the amount of the terpolymer used.
  • a cationic precipitant here a polyakylamine
  • the aqueous suspension containing the above-described ingredients is dewatered and dried.
  • the first and the second paper are thus formed identical to the sheet formation.
  • the first paper receives a surface treatment.
  • a surface sizing is performed which closes the surface of the paper and further improves the strength properties of the paper.
  • the surface gluing is each applied to both sides of the first and second paper.
  • the silica particles have a Mohs hardness of 9.
  • a dye is added to the surface sizing to distinguish the first and second papers.
  • This surface sizing is dried at a temperature of 90 ° C. This drying causes the surface sizing with the silica particles contained therein to form as a film on the surface of the paper, thereby significantly improving the dimensional stability and slip resistance of the paper.
  • the second paper is also provided with surface gluing.
  • the same styrene acrylate is used, which was also used for the surface sizing of the first paper, but without the silica particles.
  • the drying of the surface gluing is carried out as described above.
  • the abrasive carrier according to the invention absorbs less moisture, so that it can be used effectively even in a humid environment.
  • a scrim of polyamide fibers is used, in which, as from Fig. 1 can be seen, a thread in the X direction and two threads in the XY direction, each extending at an angle ⁇ of 55 ° to the X-thread.
  • the two threads in the XY direction are arranged at an angle of 70 ° to each other.
  • a maximum of 3 threads intersect.
  • the jelly threads are used with a diameter of 100 microns.
  • the clutch has a weight of 20 g / m 2 .
  • a polyamide hot melt adhesive having a melting point of 140 ° C is applied in an amount of 40 g / m 2 on each side of the first and second papers. Subsequently, the scrim made of polyamide fibers is inserted between both papers and the sandwich product of two outer paper layers and a glued therebetween scrim is assembled in a calender under a pressure of 4 bar, usually cooled until the hot melt adhesive.
  • the abrasive carrier according to the invention has a weight of 400 g / m 2 and is thus at least 50% lighter than the reference product.
  • the abrasive carrier thus prepared may, for. B. in sheets of 2800 x 2300 mm to be divided. Thus, the abrasive carrier in industrial grinding devices for grinding larger parts such. As door leaves or cabinets.
  • abrasive is applied to the surface of the second, uncoloured paper as usual with the aid of a binder.
  • Table 1 shows in comparison the properties of a reference product, which consists of a layer of cardboard with a basis weight of about 350 g / m 2 , which is associated with a about 250 g / m 2 heavy scrim.
  • the total weight of the reference product is 600 g / m 2 and is therefore about 50% heavier than the abrasive carrier according to the invention.
  • Table 1 further shows the properties of an abrasive carrier according to the invention which is stronger and lighter than the known reference product.
  • the abrasive carrier according to the invention shows significantly improved elongation at break values. This is also an indicator of the dimensional stability of the abrasive carrier, which shows that during use hardly a change in shape, in particular no lengths of a rotating abrasive carrier takes place.
  • Table 1 shows the properties of the abrasive thus produced parameter unit reference execution Number of layers 2 3 area based size g / m 2 600 - 650 400 thickness microns 548 density g / m 3 0.73 Breaking strength MD N / 15mm ⁇ 360 274 Breaking force CD N / 15mm 187 Wet breaking force 60min MD N / 15mm 62.2 Wet breaking force 60min CD N / 15mm 39.7 Elongation MD % 3.9 0.98 Elongation CD % 10.8 3.46 Tear-up work Brecht-Imset mJ / m nm * Tear-up work to Elmendorf mN 8,000 - 12,000 nm * Smoothness to Bekk S 15 4-6 Gap resistance Scott-Bond Y / m 2 259 Splitting resistance Brecht-Knittweis kN / m 0.83 Bending stiffness resonance length MD mN / m 61.5 Bending stiffness resonance length CD mN / m 32.2 Mois
  • the abrasive carrier of the invention is superior to the known reference product, especially in the tear propagation.
  • This parameter is essential for abrasive carriers, because, due to the forces occurring when using an abrasive carrier, wear or damage to the abrasive carrier often represent themselves as tears. If these tears remain localized, the abrasive carrier can continue to be used. If, on the other hand, the tears continue over the cross section of the abrasive carrier after a short time, the abrasive carrier tears and must be replaced. Apart from that that a u. U. not yet consumed abrasive carrier does not need to be used and disposed of, causes a change of the abrasive carrier standstill and production failure.
  • Table 1 thus shows the advantageous properties of an abrasive carrier according to the invention, in particular its low weight combined with high strength properties, which virtually completely prevent tearing from the edge.
  • the above recipes may advantageously z. B. 0.75 wt .-% guar gum (based on the pulp used) are added. As a result, improved strength values, in particular better tear propagation, are achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP18205993.1A 2017-11-13 2018-11-13 Support d'abrasif Withdrawn EP3482878A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017126627.5A DE102017126627A1 (de) 2017-11-13 2017-11-13 Schleifmittel

Publications (1)

Publication Number Publication Date
EP3482878A1 true EP3482878A1 (fr) 2019-05-15

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ID=64308649

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18205993.1A Withdrawn EP3482878A1 (fr) 2017-11-13 2018-11-13 Support d'abrasif

Country Status (2)

Country Link
EP (1) EP3482878A1 (fr)
DE (1) DE102017126627A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2333980A1 (de) * 1973-07-04 1975-01-23 Carborundum Werke Gmbh Bahnfoermiges verbundmaterial fuer die herstellung ueberbreiter schleifbaender
WO1989001405A1 (fr) * 1987-08-10 1989-02-23 Texbau Kirchner Gmbh Procede et dispositif de production de tissus d'armure a fils de trame diagonaux
DE69228487T2 (de) * 1991-12-20 1999-09-02 Minnesota Mining And Mfg. Co. Ueberzogenes schleifband mit endlosem, verbandfreiem traeger und herstellungsverfahren
DE20013377U1 (de) * 2000-08-01 2000-10-05 Jöst, Peter, 69518 Abtsteinach Schleifband für eine Bandschleifmaschine
DE69611372T2 (de) * 1995-08-10 2001-05-23 Minnesota Mining And Mfg. Co., Saint Paul Verfahren zum herstellen von einem nahtlosen uberzogenen schleifband
US20050130536A1 (en) * 2003-12-11 2005-06-16 Kimberly-Clark Worldwide, Inc. Disposable scrubbing product
US20100279061A1 (en) * 2007-11-26 2010-11-04 Arjowiggins Arches Method of fabricating a reinforced medium for abrasive-coated grinding material, and abrasive-coated grinding material obtained therefrom
JP2012006124A (ja) * 2010-06-25 2012-01-12 Nippon Resibon Corp 回転弾性砥石
DE102011112412A1 (de) * 2011-09-06 2013-03-07 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Harzgebundene Trennscheibe
DE102014006822A1 (de) * 2014-05-08 2015-11-12 Neenah Gessner Gmbh Schleifmittelträger und daraus hergestellter Schleifartikel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE842267C (de) * 1950-12-20 1952-09-15 Rolf Moroni Verfahren und Vorrichtung zur fortlaufenden Herstellung von endlosen Platten, Bahnenoder Folien aus aufschaeumbaren Stoffen, insbesondere solchen auf Polyurethanbasis
DE9412557U1 (de) * 1994-08-04 1994-11-10 Falk, Klaus-R., 48163 Münster Schleifkörper

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2333980A1 (de) * 1973-07-04 1975-01-23 Carborundum Werke Gmbh Bahnfoermiges verbundmaterial fuer die herstellung ueberbreiter schleifbaender
WO1989001405A1 (fr) * 1987-08-10 1989-02-23 Texbau Kirchner Gmbh Procede et dispositif de production de tissus d'armure a fils de trame diagonaux
DE69228487T2 (de) * 1991-12-20 1999-09-02 Minnesota Mining And Mfg. Co. Ueberzogenes schleifband mit endlosem, verbandfreiem traeger und herstellungsverfahren
DE69611372T2 (de) * 1995-08-10 2001-05-23 Minnesota Mining And Mfg. Co., Saint Paul Verfahren zum herstellen von einem nahtlosen uberzogenen schleifband
DE20013377U1 (de) * 2000-08-01 2000-10-05 Jöst, Peter, 69518 Abtsteinach Schleifband für eine Bandschleifmaschine
US20050130536A1 (en) * 2003-12-11 2005-06-16 Kimberly-Clark Worldwide, Inc. Disposable scrubbing product
US20100279061A1 (en) * 2007-11-26 2010-11-04 Arjowiggins Arches Method of fabricating a reinforced medium for abrasive-coated grinding material, and abrasive-coated grinding material obtained therefrom
JP2012006124A (ja) * 2010-06-25 2012-01-12 Nippon Resibon Corp 回転弾性砥石
DE102011112412A1 (de) * 2011-09-06 2013-03-07 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Harzgebundene Trennscheibe
DE102014006822A1 (de) * 2014-05-08 2015-11-12 Neenah Gessner Gmbh Schleifmittelträger und daraus hergestellter Schleifartikel

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