EP0224034A1 - Méthode et dispositif pour prévenir la descente de particules en suspension et station de traitement thermique d'une installation de recouvrement intérieur à transfert continu - Google Patents

Méthode et dispositif pour prévenir la descente de particules en suspension et station de traitement thermique d'une installation de recouvrement intérieur à transfert continu Download PDF

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Publication number
EP0224034A1
EP0224034A1 EP86114663A EP86114663A EP0224034A1 EP 0224034 A1 EP0224034 A1 EP 0224034A1 EP 86114663 A EP86114663 A EP 86114663A EP 86114663 A EP86114663 A EP 86114663A EP 0224034 A1 EP0224034 A1 EP 0224034A1
Authority
EP
European Patent Office
Prior art keywords
arrangement
area
nozzle arrangement
nozzle
heat radiator
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Withdrawn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
EP86114663A
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German (de)
English (en)
Inventor
Hardy P. Dr. Weiss
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.)
Praezisions Werkzeuge AG
Original Assignee
Prazisions-Werkzeuge AG
Praezisions Werkzeuge 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 Prazisions-Werkzeuge AG, Praezisions Werkzeuge AG filed Critical Prazisions-Werkzeuge AG
Publication of EP0224034A1 publication Critical patent/EP0224034A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B17/00—Methods preventing fouling
    • B08B17/02—Preventing deposition of fouling or of dust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains

Definitions

  • the present invention relates to a method for preventing the dropping of suspended particles or droplets onto a surface that is to be kept clean in this regard, at least one dimension, an arrangement therefor, an application of the method or the arrangement mentioned to a thermal treatment station for the internal coating of cylindrical bodies, such as can bodies, preferably for the inner coating of their longitudinal weld section and a thermal treatment station on a continuous internal coating system for cylindrical bodies, such as for can bodies.
  • a coating medium in which, for example, a coating medium is applied in powder form or in the form of droplets or in liquid form to workpieces to be coated, it may be electrostatically assisted to warm up the layer after application in order to fuse the particles or Drying the liquid application to achieve a tight seam.
  • heat sources are provided in the area of the layer produced.
  • the object of the present invention is to develop a method of the type mentioned in the introduction in such a way that a surface to be kept clean, which is at least one dimension in size, is not contaminated by sinking floating particles or droplets.
  • This object is achieved in that a gas flow is generated over the surface by gas injection and / or suction over a large area.
  • a layer of flowing gas is thus generated over the surface to be kept clean, which entrains sinking particles or droplets before the latter have hit the surface to be kept clean. Even if the latter only needs to be blown in a small area to be kept clean in order to prevent precipitation of particles or droplets, this does not lead to a goal in a larger area to be kept clean, because the resulting turbulence would probably result in a small area of precipitation keep clear, but promote this precipitation in adjacent areas.
  • the surface to be kept clean is the radiation surface of a heat radiator
  • the gas flow above this surface gives rise to the problem that the efficiency of the radiator is reduced in that the surface, if no further measures are taken, is cooled by the gas flow.
  • the gas flow be selected in the order of magnitude of the natural convection caused by the heat radiator or that the gas be heated in continuous operation, as by means of the heat radiator itself.
  • the last-mentioned variant is realized by doing this Gas in circulation mode drives through a thermally well-insulated system, if necessary additionally heated there, thereby preventing heat from being removed from the radiator by the gas flow.
  • the above-mentioned arrangement for solving the problem is characterized in that in the area of the surface there is at least one channel pressurized with over or under pressure, with an extended nozzle arrangement, preferably with a large number of discrete passages.
  • the channel results in a largely constant pressure distribution along the nozzle arrangement, so that gas flows out of it, evenly distributed.
  • gas flows out of it, evenly distributed.
  • the nozzle arrangement preferably comprises a metal structure produced by galvanic application to a negative mold with a large number of pins.
  • a structure made in this way has neatly defined, closely spaced small passages, and ensures a largely turbulence-free gas inflow or outflow.
  • About 10 to about 60 passages per running centimeter are preferably provided on the nozzle arrangement, preferably with a passage cross cut areas, so that their sum makes up about 40% of the arrangement area.
  • the nozzle arrangement form a channel arranged at a radial distance and coaxial with a longitudinal axis of the radiator.
  • passages are selectively covered, such as by adhesive tape or varnish, for the selective keeping of active passage patterns that are extended in line or area. This means that lines with practically the same effect can be kept free of openings with very narrow slit nozzles, the rest are covered.
  • the mentioned galvanic manufacturing technique for the nozzle arrangement is characterized by a further, essential advantage.
  • the aforementioned galvanic production results in an extraordinarily smooth metallic surface, the latter, brought into the area of the radiator, acting as a radiation reflector and, like a rod emits heat radiation that is not emitted towards the workpiece by reflection against the workpiece.
  • a thermal treatment station according to the invention on a continuous internal coating system for cylindrical bodies, such as for can bodies, has a heat radiator which is longitudinally extended in the direction of travel and is arranged within the interior movement path of the bodies, and the arrangement mentioned above in order to keep the radiator surface clean.
  • FIG. 1 shows an extended surface 1, above which floating particles 3 or floating droplets are present and which, due to their own weight G, lower against surface 1.
  • large-area gas injection or extraction may also be realized, as shown in dashed lines a turbulence lifting the particles 3. Due to the large-area gas flow, a flowing gas layer 7 is formed over the surface 1, which prevents the suspended particles 3 from lowering onto the surface 1. It must be ensured that the gas injection or extraction takes place along the surface 1 in such a way that as little turbulence as possible arises, relative to the expansion of the surface 1, which would drive the particles 3 against the surface 1 in certain areas, which is just to be prevented.
  • the surface 1 ′ to be kept clean is formed by the heat radiating surface of a schematically illustrated heat radiator 9 with a heating coil 11 through which current flows.
  • a heat radiator 9 per se causes natural convection K by the gas heated above the radiator 9 rising in a known manner. If floating particles 3 are to be prevented from sinking onto the radiating surface 1 'by realizing a large-area gas flow over this surface 1' according to the invention, it must also be prevented that the efficiency of the radiator 9 is caused by this gas flow is unreasonably reduced, the radiant surface 1 'is cooled too much by the gas flow. As shown schematically in FIG.
  • the amount of heat dissipated by the gas flow can be kept to negligible values by keeping the amount of gas flowing over the area 1 ′ per unit time as low as possible.
  • This requires the formation of very narrow nozzles 13, which act as slot nozzles, and the blowing or sucking sides are acted upon with relatively small overpressures or underpressures ⁇ ⁇ p.
  • FIG. 3 A simple possibility of realizing such nozzle structures acting as slot nozzles is shown in FIG. 3.
  • An overpressure or vacuum channel 21 is formed in its longitudinal extent by three walls 23.
  • the fourth longitudinal wall, which forms an actual nozzle wall 25, consists of a structure with a large number of closely spaced small, discrete passages 27.
  • the desired nozzle contour on the nozzle wall 25 is covered by covering unnecessary passages 27 with adhesive tape, lacquer, silicone, rubber or by any other means another material that is suitable for this purpose is realized, generally by covers 29 and only the passages 27 a are left free, which define the desired nozzle contour, as shown in FIG. 3, the desired narrow nozzle slot.
  • Such a nozzle wall section or the structure used for this purpose is preferably, and as shown schematically in FIG. 6, galvanically produced by removing a metal layer 35 on a negative mold 31 with a large number of pins 33 lying close together. This creates an extremely smooth layer 35 with a very fine, dense pattern of the opening formed by the pins 33.
  • other manufacturing processes can also be used, such as the use of lasers to produce the passages in a smooth, at most thin, material phase.
  • the nozzle wall section is preferably formed with approximately 10 to approximately 60 passages 27 per running centimeter, the openings of which are dimensioned such that they make up approximately 40% of the nozzle wall surface.
  • the flat metal surface realized in this way structure 35 has great advantages, particularly when used with heat radiators.
  • Such coatings are often carried out by injecting powder or liquid particles against the workpieces to be coated, this coating is often supported electrostatically and after the workpieces have been provided with the powder or the liquid coating medium, the latter is thermally treated, ie heated.
  • This thermal treatment can in principle be carried out in such a way that thermal radiation sources are provided on the side of the workpieces facing away from the coating, with which the workpieces are heated, which leads to the desired effect with regard to the coating medium just applied.
  • the heat of the emitters is poorly used by using a large part of the heat to warm up the workpieces: depending on the material, volume or treatment time of the workpieces, the heat emitters provided must be designed for significantly higher outputs than the thermal ones Effect on the coating medium would actually be necessary.
  • the above-mentioned emitters are now arranged on the same workpiece side that is also coated and As close as possible to the area in which the coating medium is applied to the workpieces, solid or liquid particles falling back from the workpieces and / or injected medium particles or droplets penetrating into the thermal treatment zone from the coating zone, if they striking the radiating surfaces of the emitters, by hardening, burning, etc. a layer that is sometimes difficult to remove.
  • the arrangement of the heat radiators on the coated workpiece side would allow a drastic reduction in the radiator output.
  • the coating technology mentioned is also used for the internal coating of cylindrical bodies, such as can bodies, for can production, in particular for the food industry.
  • can bodies 37 are moved over a cantilever arm by means of transport, not shown here and not essential in the context of the present invention, the cylindrical bodies 37, also not shown in FIG. 4, only by shaping sheets, then welding the longitudinal edges, are created, whereupon the welded, cylindrical bodies 37 are guided along the arm 39 via a coating station 41.
  • a coating station 41 at the coating station 41 by a feed line device 43 a coating medium in the form of solid particles or droplets, gas-driven, injected and adhered to the inner wall of the body 37, often supported by electrostatic forces, on the inner wall of the body 37.
  • the electrostatic forces are created by applying a high electric field between the mouth area the feed line 43 and the bodies 37 realized.
  • a suction station 46 sucks off the coating medium emerging in the direction F flowing towards the body 37.
  • the weld seam part of the body 37 is coated in this way.
  • a thermal treatment station 44 designed in accordance with the invention is now provided, which, as shown in FIG. 4, comprises a heat radiator 51, which is elongated in the direction F and arranged on the arm 39 and which now serves as the coating medium in the manner described above -Extremely exposed to pollution.
  • the arrangement of the heat radiator 51 directly in the area of the previously applied coating enables an optimal utilization, ie an optimal efficiency of the heat radiator 51
  • FIG. 5 shows a cross-sectional view through the thermal treatment station 44 according to the invention.
  • a groove 45 is incorporated in the protruding arm 39, immediately below the part of the cylindrical one provided with the coating 47 Body 37 with its weld seam 49, the bodies 37 being moved with the transport means, not shown, such as chain drives etc., at a distance with respect to the arm 39 over the latter.
  • a heat radiator such as an infrared rod radiator 51, is arranged in the channel 45, for example an infrared radiator with a quartz tube, such as manufactured by Heraeus.
  • the groove 45 has a collar 53 projecting against a plane of symmetry E placed through the area of the weld seam 49, on which a nozzle wall 55, preferably of the structure shown and described with reference to FIG.
  • the nozzle wall 55 comprises the radiator 51 coaxially.
  • the trough 45 with the nozzle wall 55 thus acts as a channel, analogously to the channel 21 from FIG. 3, which is supplied with pressure, for example, by overpressure + ⁇ p via a line arrangement 57.
  • passages 27 a which remain active are left open by means of covers 29 and define, for example, two lateral and a lower longitudinally elongated slot nozzle 59 and 61, respectively.
  • a large area of the radiator 51 acts against the arm 39 and would in itself heat the latter and not the coating 47.
  • the efficiency of the emitter 51 is now increased, however, in that the nozzle wall 55 is formed with a smooth, reflective surface directed against the emitter 51, as a result of which the nozzle wall 55 also performs the functions of a reflector in addition to its injection task.
  • a reflective, smooth surface is, as already mentioned above, realized by using a galvanically produced nozzle structure 35, as described with reference to FIG. 6, as the nozzle wall 55.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
EP86114663A 1985-10-29 1986-10-22 Méthode et dispositif pour prévenir la descente de particules en suspension et station de traitement thermique d'une installation de recouvrement intérieur à transfert continu Withdrawn EP0224034A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4639/85 1985-10-29
CH463985 1985-10-29

Publications (1)

Publication Number Publication Date
EP0224034A1 true EP0224034A1 (fr) 1987-06-03

Family

ID=4279887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114663A Withdrawn EP0224034A1 (fr) 1985-10-29 1986-10-22 Méthode et dispositif pour prévenir la descente de particules en suspension et station de traitement thermique d'une installation de recouvrement intérieur à transfert continu

Country Status (3)

Country Link
EP (1) EP0224034A1 (fr)
JP (1) JPS62102853A (fr)
CN (1) CN86107427A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661117A1 (fr) * 1990-04-24 1991-10-25 Commissariat Energie Atomique Procede de protection de surfaces contre la contamination particulaire ambiante a l'aide d'elements soufflants.
GB2376873A (en) * 2001-05-31 2002-12-31 Ian Robert Fothergill Analysis or disposal of surface adherents
WO2003024631A1 (fr) * 2001-09-18 2003-03-27 Waldner Laboreinrichtungen Gmbh & Co. Kg Hotte fermee

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR921440A (fr) * 1945-11-14 1947-05-07 Traitements Electrolytiques So Perfectionnements aux dispositifs de ventilation des bains dégageant des vapeurs nocives
US3815544A (en) * 1971-01-19 1974-06-11 Nordson Corp Apparatus for striping inside seams of cans
DE2439778A1 (de) * 1974-08-20 1976-03-25 Karl Dittmann Verfahren und anordnung zum klimatisieren eines operationsraumes
GB1474732A (en) * 1975-03-11 1977-05-25 Carrier Drysys Ltd Paint-spraying booths
FR2442084A1 (fr) * 1978-11-24 1980-06-20 Svenska Flaektfabriken Ab Boite d'aspiration pour l'evacuation d'air contamine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR921440A (fr) * 1945-11-14 1947-05-07 Traitements Electrolytiques So Perfectionnements aux dispositifs de ventilation des bains dégageant des vapeurs nocives
US3815544A (en) * 1971-01-19 1974-06-11 Nordson Corp Apparatus for striping inside seams of cans
DE2439778A1 (de) * 1974-08-20 1976-03-25 Karl Dittmann Verfahren und anordnung zum klimatisieren eines operationsraumes
GB1474732A (en) * 1975-03-11 1977-05-25 Carrier Drysys Ltd Paint-spraying booths
FR2442084A1 (fr) * 1978-11-24 1980-06-20 Svenska Flaektfabriken Ab Boite d'aspiration pour l'evacuation d'air contamine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661117A1 (fr) * 1990-04-24 1991-10-25 Commissariat Energie Atomique Procede de protection de surfaces contre la contamination particulaire ambiante a l'aide d'elements soufflants.
EP0454555A1 (fr) * 1990-04-24 1991-10-30 Commissariat A L'energie Atomique Procédé de protection de surfaces contre la contamination particulaire ambiante à l'aide d'éléments soufflants
US5241758A (en) * 1990-04-24 1993-09-07 Commissariat A L'energie Atomique Process for protecting surfaces against ambient particulate contamination with the aid of blowing elements
GB2376873A (en) * 2001-05-31 2002-12-31 Ian Robert Fothergill Analysis or disposal of surface adherents
WO2003024631A1 (fr) * 2001-09-18 2003-03-27 Waldner Laboreinrichtungen Gmbh & Co. Kg Hotte fermee
US9266154B2 (en) 2001-09-18 2016-02-23 Waldner Laboreinrichtungen Gmbh & Co. Kg Fume extraction cabinet with a working chamber

Also Published As

Publication number Publication date
JPS62102853A (ja) 1987-05-13
CN86107427A (zh) 1987-04-29

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