EP1699597A1 - Procede et installation de fabrication d'abrasifs souples, et abrasifs ainsi obtenus - Google Patents

Procede et installation de fabrication d'abrasifs souples, et abrasifs ainsi obtenus

Info

Publication number
EP1699597A1
EP1699597A1 EP03819227A EP03819227A EP1699597A1 EP 1699597 A1 EP1699597 A1 EP 1699597A1 EP 03819227 A EP03819227 A EP 03819227A EP 03819227 A EP03819227 A EP 03819227A EP 1699597 A1 EP1699597 A1 EP 1699597A1
Authority
EP
European Patent Office
Prior art keywords
adhesive layer
applying
abrasive material
furnace
flexible
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Withdrawn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
EP03819227A
Other languages
German (de)
English (en)
Inventor
Claudio Lesizza
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.)
Impianti Macchine & Tecnologie Srl
Original Assignee
Impianti Macchine & Tecnologie 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
Application filed by Impianti Macchine & Tecnologie Srl filed Critical Impianti Macchine & Tecnologie Srl
Publication of EP1699597A1 publication Critical patent/EP1699597A1/fr
Withdrawn legal-status Critical Current

Links

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 present invention relates to a method for manufacturing flexible abrasives and in particular abrasive tapes, as well as a manufacturing plant which carries out said method and a flexible abrasive manufactured with said method.
  • the known methods for manufacturing abrasive tapes on supports of paper, cloth, fibre or combinations thereof, or on synthetic supports, consist of applying a first adhesive layer, generally phenolic, on the flexible support, whereon the abrasive material in a granular form is then applied.
  • the flexible support is subjected to a first thermal treatment in a hot air-circulating furnace.
  • the flexible support hanging in festoons, is passed through said furnace, so as to be heated from the room temperature to a temperature of about 130°C through fixed temperature increments.
  • the first layer of adhesive is hardened.
  • a second adhesive layer called covering adhesive, is applied onto the flexible support.
  • the flexible support is subjected to a second thermal treatment in conditions analogous to the first, but for a period of time from three to six hours. Finally the product is rolled up in bobbins and subjected to a continuous reticulation that lasts several hours.
  • furnaces of big size especially if phenolic adhesives are used.
  • these last being particularly sensitive to thermal gradients, require drying rooms which are often longer than 200 meters and, therefore, high installation and production costs.
  • the furnaces are shorter, and thus the variations in temperature faster and the thermal gradients of greater amount, steam bubbles may be formed, due to a too quick evaporation of the solvent, which make the surface of the adhesive layers craped and damage the compactness thereof.
  • the non-phenolic adhesives have worse mechanical properties in terms of tenacity, hardness, resilience, thermal stability and water resistance.
  • the use of phenolic adhesives is unavoidable.
  • the phenolic adhesives are the cheapest ones among those suitable for manufacturing flexible adhesives. -
  • some manufacturers of abrasives thought to use phenolic adhesives with additives, such as polyvinyl alcohol in an aqueous solution, cellulose derivates, starch or starch derivates, suitable for reducing the times of the drying process of the phenolic resin.
  • EP 591902 describes the use of a phenolic adhesive of high molecular weight (1400-3500) diluted with a higher boiling organic solvent, as for example cyclohexanone or ethoxyethanol, for manufacturing abrasives by means of linear furnaces and hence with quicker drying processes.
  • the object of the present invention is therefore to provide a method and a plant for manufacturing flexible abrasives, which are free from the above mentioned drawbacks. This object is achieved with a plant, a method and a flexible abrasive, the main features of which are specified in claims 1, 8 and 13, respectively, while other features are specified in the remaining claims.
  • the method for manufacturing abrasives according to the present invention comprises the application of several thin layers of covering adhesives, which therefore reticulates in a short time and in small furnaces without requiring sophisticated ventilation systems, with consequent remarkable economic advantages.
  • the flexible abrasive obtained with the method according to the present invention being provided with several adhesive layers, has excellent mechanical characteristics.
  • Another advantage of the method according to the present invention is the possibility to use traditional phenolic adhesives, with consequent advantages from the economic point of view as well as from the point of view of the properties of the product obtained therefrom. Further advantages and features of the method for manufacturing flexible abrasives and of the relevant manufacturing plant according to the present invention will be clear to those skilled in the art from the following detailed and non-limiting description of one embodiment thereof with reference to the attached drawings wherein:
  • FIG. 1 shows a schematic side view of a plant for manufacturing flexible abrasives according to the present invention.
  • FIG. 2 shows a schematic sectional view of a flexible abrasive manufactured with the method according to the present invention.
  • the plant for manufacturing flexible abrasives according to the present invention comprises in a known way an unwinding machine 1 suitable for unwinding a flexible support 2 winded in a bobbin. After passing through a printer 3 which prints the trade mark or other signs onto the back of the flexible support 2, the latter passes through a first gluing machine 4 suitable for depositing a first layer 5 of adhesive.
  • Said gluing machine 4 may be of any known type, for example with cylinders, with a wiping blade, a spray type, a film type, ecc, while the adhesive may be a animal or vegetal gelatin, a urea-formol resin, a melaminic, acrylic, alkilyc, epoxidic, urethanic, phenol-formaldehyde resin, or any other substance of a known type.
  • An abrasive material 6 in a granular form is applied on the adhesive layer 5, still in a liquid state.
  • Said abrasive material 6 may be a natural product as garnet or naxos or a synthetic product as aluminum oxide or silicon carbide in several forms (alumina zirconium, CBN diamond, ecc). It may be applied by means of gravity on the adhesive layer 5 or by using electrostatic force or any other known method.
  • the plant is provided with two different systems for applying the abrasive: a sprinkler 7 which exploits the gravity force and an electrostatic device 8. It allows to use abrasives with different characteristics by selecting the more suitable application system or to use simultaneously the two systems, if necessary.
  • the flexible support 2 is subjected to a first thermal treatment which may be carried out through convection, conduction, irradiation or combinations thereof.
  • this thermal treatment takes places in a furnace 9 with an infrared radiating surface, in particular gas-powered panels emitting infrared rays. Said thermal treatment in furnace 9 allows to quickly obtain the temperature required for the complete reticulation of the adhesive layer 5 without damaging it.
  • the so obtained abrasive tape 10 is suitably subjected to at least two further treatments of applying and drying adhesive layers 11. These treatments take place in two or more modular apparatuses 12 arranged in series downstream furnace 9. In the present embodiment, the modular apparatuses 12 are three.
  • Each modular apparatus 12 has a gluing machine 13 and a furnace 14, preferably of the type with an infrared radiating surface.
  • the gluing machine 13 comprises two cylinders, at least one of which coated with rubber, and a wiping blade fitted for making the applied adhesive layer homogeneous.
  • the gluing machine 13 can be adjusted so as to apply thin adhesive layers 11, in particular having a thickness lower than 100 micron. In fact, the adhesive layers 11 must have such thicknesses that the adhesives coming out from the furnaces 14 are completely reticulated, so as to avoid to subject the finished products to a subsequent step of discontinuous reticulation.
  • the finished tape 10 coming out from the last modular apparatus 12 is wound again in a bobbin through a winding machine 15.
  • the modular apparatuses 12 comprise preferably ventilation means 16, arranged upstream furnaces 14, fitted for uniformly distributing the adhesive layer 11 applied by the gluing machines 13.
  • said ventilation means 16 comprise a blowing machine which emits an air jet on the surface of the adhesive layer 11.
  • the flexible support 2 may be made of any known suitable material.
  • the most used materials for carrying out the flexible support 2 are paper, fibre, cotton fabric, synthetic fibre fabric, other synthetic means or a combination thereof.
  • the adhesive layers 11 may be of a different type so as to obtain combinations which confer to the obtained products particular mechanical characteristics as the resilience or the molecular rigidity as well as an high abrasion index.
  • Tibacker was used as abrasive.
  • An adhesive layer 5 of 280 g/m 2 and then 1300 g/m 2 of abrasive material 6 were wet-applied onto the paper support 2.
  • the sample A was dried in a traditional furnace with an increasing temperature from 80°C to 100°C for a period of 60 minutes. When the resin became hard, a covering adhesive layer was applied and the product was subjected to a thermal treatment analogous to the first one with temperatures from 80°C to
  • the sample B instead, was subjected to a drying treatment in an infrared furnace 9 for 60 seconds.
  • the adhesive was aheady hardened and thus three covering adhesive layers 11 were applied, having a thickness of about 100 micron, in three subsequent steps of 60 seconds each, each followed by a drying step in an infrared furnace 14.
  • Said furnace 14 comprised a porous means in sintered metallic fibres; the radiating surface was at the temperature of 800°C; the wavelength of the emitted rays was comprised between 2,5 and 3 micron.
  • the applied adhesive layer 11 was compact and free from craters or bubbles caused by the rapid evaporation of the solvent.
  • the two samples A and B were kept for 24 hours in the same room and then subjected to efficiency tests.
  • Both the samples A, B were subjected to tests of the duration of 8 minutes. These tests showed that the abrasion index of the sample B, expressed as amount of abraded material per unity of weight lost by the disk, was notably higher than the abrasion index of sample A.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

L'invention porte sur un procédé et une installation de fabrication d'abrasifs souples. Ledit procédé comporte les étapes suivantes: application d'une première couche (5) d'adhésif sur un support souple (2); application d'un matériau abrasif (6) sur cette première couche (5); réticulation de cette première couche (5) dans un four (9); application sur le matériau abrasif (6) d'au moins deux couches (11) d'adhésif se recouvrant, chacune étant réticulée dans un four (14) avant de l'application de la couche suivante.
EP03819227A 2003-12-29 2003-12-29 Procede et installation de fabrication d'abrasifs souples, et abrasifs ainsi obtenus Withdrawn EP1699597A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2003/000858 WO2005063445A1 (fr) 2003-12-29 2003-12-29 Procede et installation de fabrication d'abrasifs souples, et abrasifs ainsi obtenus

Publications (1)

Publication Number Publication Date
EP1699597A1 true EP1699597A1 (fr) 2006-09-13

Family

ID=34717600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03819227A Withdrawn EP1699597A1 (fr) 2003-12-29 2003-12-29 Procede et installation de fabrication d'abrasifs souples, et abrasifs ainsi obtenus

Country Status (3)

Country Link
EP (1) EP1699597A1 (fr)
AU (1) AU2003300748A1 (fr)
WO (1) WO2005063445A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900005626A1 (it) * 2019-04-11 2020-10-11 Levorato Italia Srl Impianto per la realizzazione di abrasivi flessibili e relativo metodo di realizzazione

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906684A (en) * 1971-05-20 1975-09-23 Norton Co Abrasive articles and their method of manufacture
US3861892A (en) * 1973-02-08 1975-01-21 Norton Co Coated abrasive material and manner of manufacture
DE2853761B1 (de) * 1978-12-13 1980-03-27 Hoechst Ag Verfahren zur Herstellung von Schleifmitteln
GB9417543D0 (en) * 1994-09-01 1994-10-19 Black & Decker Inc An abrasive belt
GB9803422D0 (en) * 1998-02-18 1998-04-15 Unicorn Abrasives Ltd Abrasive belt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005063445A1 *

Also Published As

Publication number Publication date
AU2003300748A1 (en) 2005-07-21
WO2005063445A1 (fr) 2005-07-14

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