EP1492647B1 - Process for producing jumbo rolls for the production of abrasives - Google Patents

Process for producing jumbo rolls for the production of abrasives Download PDF

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Publication number
EP1492647B1
EP1492647B1 EP03744854A EP03744854A EP1492647B1 EP 1492647 B1 EP1492647 B1 EP 1492647B1 EP 03744854 A EP03744854 A EP 03744854A EP 03744854 A EP03744854 A EP 03744854A EP 1492647 B1 EP1492647 B1 EP 1492647B1
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EP
European Patent Office
Prior art keywords
abrasive belt
process according
heating apparatus
jumbo
abrasive
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.)
Revoked
Application number
EP03744854A
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German (de)
French (fr)
Other versions
EP1492647A1 (en
Inventor
Heinz-Jürgen DERN
Claudio Lesizza
Guglielmo Tonin
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.)
IMT Srl
Hexion GmbH
Original Assignee
Hexion Speciality Chemicals GmbH
IMT Srl
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
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Application filed by Hexion Speciality Chemicals GmbH, IMT Srl filed Critical Hexion Speciality Chemicals GmbH
Publication of EP1492647A1 publication Critical patent/EP1492647A1/en
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Publication of EP1492647B1 publication Critical patent/EP1492647B1/en
Anticipated expiration legal-status Critical
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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
    • B24D11/005—Making abrasive webs

Definitions

  • the invention relates to a method for producing jumbo rolls in the production of coated abrasives.
  • an endless belt of carrier material is continuously provided in several successive process steps with a base binder, with abrasive material and at least one capping agent.
  • a base binder with abrasive material and at least one capping agent.
  • drying or hardening of the thermosetting binder takes place.
  • the coated, dried and pre-cured, tack-free abrasive belt is wound up on a take-up device into a so-called jumbo roll (compare Gardziella, Pilato, Knop, Phenolic Resins, 2nd edition (2000), Springer Verlag, page 345).
  • thermosetting binder To cure the thermosetting binder, the jumbo roll is placed in an oven and heated there to a temperature above the curing temperature of the thermosetting binder, usually, when using phenolic resins as a binder to a temperature> 130 ° C.
  • the abrasive belt is already heated to an elevated temperature in the course of its production, in particular during the pre-curing of the binder in the so-called cover-bonding furnace, this thermal energy passes on the way from the cover-bonding furnace to the take-up device by braking and guide rollers and the path through the cold Indoor air largely lost. It must be fed again in the curing oven for the jumbo roll.
  • EP 0 552 698 A2 describes a conventional process for the production of abrasives.
  • a make coat is applied, which is cured only before and after the application of the abrasive material.
  • the application of the second bonding layer size coat
  • the finished abrasive is wound onto a jumbo roll.
  • DE-OS-2146 369 describes a process for producing flexible abrasive structures (webs, tapes, rolls) in which at least one bonding layer is subjected to steam during drying or during curing. It is disclosed the possibility that after the application of the second bonding layer, it is dried in the planned state. The resin can then be placed on the roll, e.g. Cured at elevated temperatures.
  • No. 4,183,847 describes the production of an abrasive product in which special layers are applied to special textiles. Information on curing was not made.
  • the method consists in that the winding device for the precured grinding belt is preceded or connected directly to a heating device, with which the grinding belt is heated in its entire width to a uniform temperature. Conveniently, this temperature is preferably at or just below the desired curing temperature of the thermosetting binder.
  • a heating device all devices can be used that provide the highest possible and controllable energy density to provide the heating of the abrasive belt in the shortest possible time and on the shortest possible path length.
  • Such heaters are e.g. Emitters, in particular heat or infrared radiators, which are directed so that the abrasive belt is irradiated evenly shortly before reaching the take-up or each on the outer web on the take-up in a certain section over its entire width evenly.
  • a furnace in particular a circulating air oven or a short-time or microwave heating device, which is passed through by the grinding belt.
  • the take-up upstream, heated rollers or heated conveyor belts over which the abrasive belt is guided to use as the invention corresponding heating devices.
  • the sanding belt brought to the desired temperature in the heating device in its entire width is immediately wound on the take-up device to the jumbo roll.
  • the jumbo roll thus obtained has a uniform temperature, which is preferably at or just below the curing temperature of the thermosetting binder. It is immediately placed in the oven and heated to a temperature above the curing temperature of the thermosetting binder. Due to the preheating of the sanding belt only a relatively small energy input is necessary for further heating of the jumbo roll. The heating is done quickly and allows an increase in production. Nevertheless, occur in the jumbo roll only small temperature differences, the curing of the thermosetting binder is uniform and there are no undesirable discoloration effects.

Abstract

The invention relates to an apparatus for producing jumbo rolls during the production of coated abrasive products. In order to provide an apparatus with which jumbo rolls can be produced during the production of coated abrasive products in such a way that uniform, rapid heating of the jumbo roll in the oven is made possible, it is proposed that a heating apparatus be connected directly before or to the winder for the pre-cured abrasive belt, with which apparatus the belt is heated to a uniform temperature over its entire width.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Jumbo-Rollen bei der Fertigung von Schleifmitteln auf Unterlage.The invention relates to a method for producing jumbo rolls in the production of coated abrasives.

Bei dieser Fertigung wird ein endloses Band aus Trägermaterial kontinuierlich in mehreren hintereinander geschalteten Verfahrensschritten mit einem Grundbindemittel, mit Schleifmaterial und mindestens einem Deckbindemittel versehen. Jeweils nach dem Aufbringen der Bindemittelschichten erfolgt eine Trocknung bzw. eine Verhärtung des duroplastischen Bindemittels. Am Endes des Fertigungsprozesses wird das beschichtete, getrocknete und vorgehärtete, klebfreie Schleifband auf einer Aufwickelvorrichtung zu einer sog. Jumbo-Rolle aufgerollt (vergl. Gardziella, Pilato, Knop; Phenolic Resins, 2. Auflage (2000), Springer Verlag, Seite 345).In this production, an endless belt of carrier material is continuously provided in several successive process steps with a base binder, with abrasive material and at least one capping agent. Each time after application of the binder layers, drying or hardening of the thermosetting binder takes place. At the end of the manufacturing process, the coated, dried and pre-cured, tack-free abrasive belt is wound up on a take-up device into a so-called jumbo roll (compare Gardziella, Pilato, Knop, Phenolic Resins, 2nd edition (2000), Springer Verlag, page 345). ,

Zur Aushärtung des duroplastischen Bindemittels wird die Jumbo-Rolle in einen Ofen eingebracht und dort auf eine Temperatur oberhalb der Härtungstemperatur des duroplastischen Bindemittels, in der Regel, bei Verwendung von Phenolharzen als Bindemittel auf eine Temperatur >130°C aufgeheizt.To cure the thermosetting binder, the jumbo roll is placed in an oven and heated there to a temperature above the curing temperature of the thermosetting binder, usually, when using phenolic resins as a binder to a temperature> 130 ° C.

Das Schleifband wird zwar im Verlauf seiner Herstellung, insbesondere bei der Vorhärtung des Bindemittels im sog. Deckbindungsofen bereits auf eine erhöhte Temperatur aufgeheizt, jedoch geht diese thermische Energie auf dem Weg vom Deckbindungsofen zur Aufwickelvorrichtung durch Brems- und Führungswalzen sowie den Weg durch die kalte Hallenluft weitgehend verloren. Sie muß im Härtungsofen für die Jumbo-Rolle neu zugeführt werden.Although the abrasive belt is already heated to an elevated temperature in the course of its production, in particular during the pre-curing of the binder in the so-called cover-bonding furnace, this thermal energy passes on the way from the cover-bonding furnace to the take-up device by braking and guide rollers and the path through the cold Indoor air largely lost. It must be fed again in the curing oven for the jumbo roll.

Je nach Größe der Jumbo-Rolle und insbesondere bei hohen Differenzen zwischen der Temperatur des Schleifbandes beim Austritt aus dem Deckbindungsofen und an der Aufwickelvorrichtung ergeben sich im Ofen starke Temperaturunterschiede in der Jumbo-Rolle: So sind die Kanten und die äußeren Lagen sofort heiß, während sich der Kern der Jumbo-Rolle nur sehr langsam erwärmt. Dadurch tritt nicht nur eine inhomogene Aushärtung des duroplastischen Bindemittels ein, sondern bei blauen Deckbindungen zudem eine sehr stark unterschiedliche Verfärbung der Oberfläche. Durch die Temperaturbelastung verfärben sich die sehr schnell erhitzten und überhitzten Partien des Schleifbandes langsam über grün nach braun, während der innere, kühlere Kern der Jumbo-Rolle schön blau bleibt. Um dieses Problem wenigstens zu mindern, werden die jumbo-Rollen extrem langsam aufgeheizt, was zu hohen Energiekosten einerseits und zu einer schlechten Produktivität andererseits führt.Depending on the size of the jumbo roll and especially at high differences between the temperature of the sanding belt as it exits the deckbonding furnace and on the take-up device, there are large differences in temperature in the jumbo roll in the kiln: the edges and outer layers are immediately hot while the core of the jumbo roll heats up only very slowly. As a result, not only an inhomogeneous curing of the thermosetting binder occurs, but also a very different discoloration of the surface with blue cover bonds. As a result of the temperature load, the very quickly heated and overheated parts of the sanding belt slowly turn green to brown, while the inner, cooler core of the jumbo roll remains nicely blue. To at least alleviate this problem, the jumbo rollers are heated extremely slowly, resulting in high energy costs on the one hand and poor productivity on the other.

Die EP 0 552 698 A2 beschreibt ein herkömmliches Verfahren zur Herstellung von Schleifmitteln. Auf das Trägermaterial wird ein Grundharz (make coat) aufgebracht, was erst vor- und nach der Aufbringung des Schleifmaterials ausgehärtet wird. Anschließend erfolgt die Aufbringung der zweiten Bindungsschicht (size coat), die nach einer eventuellen Vorhärtung komplett ausgehärtet wird. Nach der vollständigen Aushärtung der zweiten Bindungsschicht wird das fertige Schleifmittel auf eine Jumborolle aufgewickelt.EP 0 552 698 A2 describes a conventional process for the production of abrasives. On the carrier material, a make coat is applied, which is cured only before and after the application of the abrasive material. Subsequently, the application of the second bonding layer (size coat) takes place, which is completely cured after a possible pre-curing. After complete cure of the second bond coat, the finished abrasive is wound onto a jumbo roll.

Die US 3,020,139 beschreibt die Herstellung eines Schleifproduktes, bei dem auf einem speziellen Träger verschiedene Schichten aufgebracht werden. Die Aushärtung erfolgt ausschließlich Im Jumboofen.US Pat. No. 3,020,139 describes the production of an abrasive product in which different layers are applied on a special support. Curing takes place exclusively in Jumboofen.

Die DE -OS-2146 369 beschreibt ein Verfahren zur Herstellung von flexiben Schleifmittelgebilden (Bahnen, Bänder, Rollen) bei denen zumindest eine Bindungsschicht während des Trocknens oder während der Härtung mit Wasserdampf beaufschlagt wird. Es ist die Möglichkeit offenbart, dass nach der Aufbringung der zweiten Bindungsschicht diese im planen Zustand getrocknet wird. Das Harz kann dann auf der Rolle z.B. bei erhöhten Temperaturen ausgehärtet werden.DE-OS-2146 369 describes a process for producing flexible abrasive structures (webs, tapes, rolls) in which at least one bonding layer is subjected to steam during drying or during curing. It is disclosed the possibility that after the application of the second bonding layer, it is dried in the planned state. The resin can then be placed on the roll, e.g. Cured at elevated temperatures.

Die US 4,183,847 beschreibt die Herstellung eines Schleifproduktes, bei dem auf spezielle Textilien spezielle Schichten aufgebracht werden. Angaben zur Aushärtung wurden nicht gemacht.No. 4,183,847 describes the production of an abrasive product in which special layers are applied to special textiles. Information on curing was not made.

Es ist Aufgabe der vorliegenden Erfindung, ein Verfahren bereitzustellen, mit der sich Jumbo-Rollen bei der Fertigung von Schleifmitteln auf Unterlage so herstellen lassen, daß eine gleichmäßige, schnelle. Aufheizung der Jumbo-Rolle im Ofen ermöglicht wird und damit die eingangs erwahnten Probleme ungleichmäßigen Härtung des Schleifmittels vermieden werden.It is an object of the present invention to provide a method by which jumbo rolls can be produced in the production of coated abrasives so that a uniform, fast. Heating of the jumbo roll in the oven is made possible and thus the above-mentioned problems of uneven hardening of the abrasive can be avoided.

Die Lösung der Aufgabe erfolgt durch ein Verfahren gemäß der Ansprüche 1 bis 7.The object is achieved by a method according to claims 1 to 7.

Das Verfahren besteht darin, daß der Aufwickelvorrichtung für das vorgehärtete Schleifband eine Aufheizvorrichtung direkt vorgeschaltet oder zugeschaltet ist, mit der das Schleifband in seiner gesamten Breite auf eine einheitliche Temperatur aufgeheizt wird. Zweckmäßigerweise liegt diese Temperatur bevorzugt bei oder kurz unterhalb der gewünschten Härtungstemperatur des duroplastischen Bindemittels.The method consists in that the winding device for the precured grinding belt is preceded or connected directly to a heating device, with which the grinding belt is heated in its entire width to a uniform temperature. Conveniently, this temperature is preferably at or just below the desired curing temperature of the thermosetting binder.

Diese Lösung der erfindungsgemäßen Aufgabe durch ein Verfahren bei dem eine zusätliche Aufheizvorrichtung, die der Aufwickelvorrichtung direkt vorgeschaltet oder zugeschaltet ist, hat den weiterenThis solution of the object according to the invention by a method in which an additional heating device, which is connected directly upstream or connected to the take-up device, has the further one

Vorteil, daß eine Nachrüstung einer bereits vorhandenen Anlage möglich ist, ohne daß daran große bauliche Veränderungen vorgenommen werden müssen.Advantage that a retrofit of an existing system is possible without it major structural changes must be made.

Als Aufheizvorrichtung sind alle Vorrichtungen einsetzbar, die eine möglichst hohe und steuerbare Energiedichte liefern, um die Erwärmung des Schleifbandes in möglichst kurzer Zeit und auf möglichst kurzer Weglänge zu erbringen. Derartige Aufheizvorrichtungen sind z.B. Strahler, insbesondere Wärme- oder Infrarotstrahler, die so gerichtet sind, daß das Schleifband entweder kurz vor Erreichen der Aufwickelvorrichtung oder jeweils auf der äußeren Bahn auf der Aufwickelvorrichtung in einem bestimmten Abschnitt auf seiner gesamten Breite gleichmäßig bestrahlt wird.As a heating device, all devices can be used that provide the highest possible and controllable energy density to provide the heating of the abrasive belt in the shortest possible time and on the shortest possible path length. Such heaters are e.g. Emitters, in particular heat or infrared radiators, which are directed so that the abrasive belt is irradiated evenly shortly before reaching the take-up or each on the outer web on the take-up in a certain section over its entire width evenly.

Erfindungsgemäß als Aufheizvorrichtungen einsetzbar ist aber auch ein Ofen insbesondere ein Umluftofen oder eine Kurz- oder Mikrowellenheizvorrichtung, die vom Schleifband durchlaufen werden. Ferner sind auch der Aufwickelvorrichtung vorgeschaltete, beheizte Walzen oder beheizte Förderbänder, über die das Schleifband geführt wird, als der Erfindung entsprechende Aufheizvorrichtungen einzusetzen.According to the invention, however, it is also possible to use a furnace, in particular a circulating air oven or a short-time or microwave heating device, which is passed through by the grinding belt. Further, the take-up upstream, heated rollers or heated conveyor belts over which the abrasive belt is guided to use as the invention corresponding heating devices.

Das in der Aufheizvorrichtung in seiner gesamten Breite auf die gewünschte Temperatur gebrachte Schleifband wird unmittelbar danach auf der Aufwickelvorrichtung zu der Jumbo-Rolle aufgewickelt. Die so erhaltene Jumbo-Rolle hat eine einheitliche Temperatur, die bevorzugt bei oder kurz unter der Härtungstemperatur des duroplastischen Bindemittels liegt. Sie wird umgehend in den Ofen eingebracht und auf eine Temperatur oberhalb der Härtungstemperatur des duroplastischen Bindemittels erhitzt. Durch die erfolgte Vorheizung des Schleifbandes ist zur weiteren Aufheizung der Jumbo-Rolle nur noch eine relativ geringe Energiezuftrhr notwendig. Die Aufheizung erfolgt dadurch schnell und ermöglicht eine Steigerung der Produktion. Trotzdem treten in der Jumbo-Rolle nur geringe Temperaturunterschiede auf, die Aushärtung des duroplastischen Bindemittels erfolgt gleichmäßig und es treten keine unerwünschten Verfärbungseffekte auf.The sanding belt brought to the desired temperature in the heating device in its entire width is immediately wound on the take-up device to the jumbo roll. The jumbo roll thus obtained has a uniform temperature, which is preferably at or just below the curing temperature of the thermosetting binder. It is immediately placed in the oven and heated to a temperature above the curing temperature of the thermosetting binder. Due to the preheating of the sanding belt only a relatively small energy input is necessary for further heating of the jumbo roll. The heating is done quickly and allows an increase in production. Nevertheless, occur in the jumbo roll only small temperature differences, the curing of the thermosetting binder is uniform and there are no undesirable discoloration effects.

Claims (7)

  1. Process for producing coated abrasive products in the form of jumbo rolls including at least the steps of:
    a) applying a basic binder to a base material,
    b) applying the abrasive material to the basic binder,
    c) applying a thermosetting top binder to the dried or pre-cured composite from step b) to fabricate the abrasive belt,
    d) heating the abrasive belt in its entire width to a uniform temperature immediately before or directly at the winder for producing jumbo rolls,
    e) producing the jumbo roll by winding up the heated and pre-cured abrasive belt at the winder and immediately thereafter
    f) fully curing the jumbo roll.
  2. Process according to Claim 1, characterized in that the heating apparatus is a thermal radiant heater which irradiates the abrasive belt uniformly over its entire width before reaching the winder.
  3. Process according to any of the preceding claims, characterized in that the heating apparatus is a thermal radiant heater which irradiates one section at a time of the outer path of the abrasive belt over its entire width on the winder.
  4. Process according to any of the preceding claims, characterized in that the heating apparatus is a recirculating oven, through which the abrasive belt passes.
  5. Process according to any of the preceding claims, characterized in that the heating apparatus is a short-wave or microwave heating apparatus, through which the abrasive belt passes.
  6. Process according to any of the preceding claims, characterized in that the heating apparatus is a heated roll, over which the abrasive belt is guided.
  7. Process according to any of the preceding claims, characterized in that the heating temperature is set close to or just below the curing temperature of the thermosetting top binder.
EP03744854A 2002-03-26 2003-03-25 Process for producing jumbo rolls for the production of abrasives Revoked EP1492647B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20204849U 2002-03-26
DE20204849U DE20204849U1 (en) 2002-03-26 2002-03-26 Device for the production of jumbo rolls
PCT/EP2003/003102 WO2003080295A1 (en) 2002-03-26 2003-03-25 Device for producing jumbo rolls for the production of abrasives

Publications (2)

Publication Number Publication Date
EP1492647A1 EP1492647A1 (en) 2005-01-05
EP1492647B1 true EP1492647B1 (en) 2006-08-30

Family

ID=7969428

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03744854A Revoked EP1492647B1 (en) 2002-03-26 2003-03-25 Process for producing jumbo rolls for the production of abrasives

Country Status (8)

Country Link
US (2) US20050279460A1 (en)
EP (1) EP1492647B1 (en)
AT (1) ATE337892T1 (en)
AU (1) AU2003255632A1 (en)
BR (1) BR0303667B1 (en)
DE (2) DE20204849U1 (en)
ES (1) ES2268392T3 (en)
WO (1) WO2003080295A1 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576276A (en) * 1948-08-02 1951-11-27 Ohio Commw Eng Co Apparatus for making flock covered paper
US3034266A (en) * 1956-02-07 1962-05-15 Grubb Kjeld Tue Metallographic polishing
US3020139A (en) * 1960-04-18 1962-02-06 Norton Co Abrasive product
US4163647A (en) * 1971-06-23 1979-08-07 Norton Company Method for producing coated abrasives
DE2146369B2 (en) * 1971-09-16 1977-04-14 Hoechst Ag, 6000 Frankfurt PROCESS FOR MANUFACTURING FLEXIBLE ABRASIVE COMPOUNDS
DE2644552B2 (en) * 1976-10-02 1978-11-30 Hoechst Ag, 6000 Frankfurt Process for the manufacture of abrasives
US5007943A (en) * 1989-11-03 1991-04-16 Norton Company Sol-gel process alumina abrasive grain blends in coated abrasive material
US5368618A (en) * 1992-01-22 1994-11-29 Minnesota Mining And Manufacturing Company Method of making a coated abrasive article
BR9306020A (en) * 1992-03-03 1997-11-18 Minnesota Mining & Mfg Abrasive article
CA2122168A1 (en) * 1993-12-16 1995-06-17 David P. Hultman Polymer-reinforced paper having improved cross-direction tear

Also Published As

Publication number Publication date
DE20204849U1 (en) 2002-09-26
BR0303667B1 (en) 2013-07-16
BR0303667A (en) 2004-07-13
US20050279460A1 (en) 2005-12-22
WO2003080295A1 (en) 2003-10-02
AU2003255632A1 (en) 2003-10-08
US20090000746A1 (en) 2009-01-01
ATE337892T1 (en) 2006-09-15
ES2268392T3 (en) 2007-03-16
DE50304859D1 (en) 2006-10-12
EP1492647A1 (en) 2005-01-05

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