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EP0791400A1 - Procédé et appareil pour revêtir un objet - Google Patents

Procédé et appareil pour revêtir un objet Download PDF

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Publication number
EP0791400A1
EP0791400A1 EP96120821A EP96120821A EP0791400A1 EP 0791400 A1 EP0791400 A1 EP 0791400A1 EP 96120821 A EP96120821 A EP 96120821A EP 96120821 A EP96120821 A EP 96120821A EP 0791400 A1 EP0791400 A1 EP 0791400A1
Authority
EP
European Patent Office
Prior art keywords
line
fluid
coating
particle
fluid flow
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.)
Granted
Application number
EP96120821A
Other languages
German (de)
English (en)
Other versions
EP0791400B1 (fr
Inventor
Felix Walser
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.)
Elpatronic AG
Original Assignee
Elpatronic 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 Elpatronic AG filed Critical Elpatronic AG
Publication of EP0791400A1 publication Critical patent/EP0791400A1/fr
Application granted granted Critical
Publication of EP0791400B1 publication Critical patent/EP0791400B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0618—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies only a part of the inside of the hollow bodies being treated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/10—Arrangements for collecting, re-using or eliminating excess spraying material the excess material being particulate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/12—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes

Definitions

  • the invention relates to a method for applying a coating to an object, in which a particulate coating material is conveyed along a conveyor line by means of a fluid stream and exits the line in a coating area.
  • the invention further relates to a device for applying a coating to an object, in which a particulate coating material is conveyed from a storage container by means of a fluid stream from a fluid source along a conveying line and emerges from the line in a coating area and strikes the object to be coated.
  • the coating particles are applied to the object to be coated, possibly under the influence of electrostatic charge, and give a durable coating there, for example by heat treatment.
  • Such a procedure is particularly known when coating or spraying the inner seam of can bodies or the entire inner wall of can bodies with coating material.
  • the coating material usually a powder
  • the coating material has to be conveyed over a long line, since the closed frame can only be accessed through the welding machine.
  • the long line requires a high velocity of the fluid, usually air, in order to convey the powder in sufficient quantity along the long line.
  • a high air velocity or particle velocity is disadvantageous at the point of exit, since this can cause the powder particles to bounce off the surface to be coated again, which worsens the application efficiency.
  • the emerging coating material should emerge as homogeneously distributed as possible or should strike the object to be coated in order to achieve a uniform coating thickness; this is particularly necessary for the seam covering of can bodies or can bodies.
  • This object is achieved in the method mentioned at the outset by removing part of the fluid flow from the line in front of the outflow region.
  • the object is achieved in the device mentioned at the outset by providing an opening in the line in front of the outlet opening of the line, to which a suction line is coupled, by means of which part of the fluid flow can be removed from the line.
  • the fluid velocity is reduced in the following line area, which causes the coating particles to be expelled at a low velocity and thus increases the degree of application.
  • the invention thus effects the separation of fluid that is necessary in terms of transport technology, but is disruptive in the outlet or spray area, from the fluid-powder mixture.
  • the lower speed and the associated increase in pressure further causes a swirling of the incoming particles, which results in better homogeneity of the exiting particle stream.
  • the fluid stream Before the part of the fluid stream is removed, it is preferably separated into a low-particle fluid stream and a high-particle fluid stream. Only the low-particle or essentially particle-free fluid flow is then removed. This means that essentially all of the coating material conveyed along the line is available available for coating or spraying, only the fluid required for transport, which is annoying in the coating area, is removed.
  • the separation into a low-particle and a high-particle fluid flow is preferably due to the difference in mass between fluid and particles, in particular by a bend in the line.
  • Figure 1 shows schematically the structure of a plant for the production and coating of can bodies.
  • the invention is explained in more detail below on the basis of this example, but this is only to be understood as a preferred embodiment.
  • the invention can also be used in the coating of other objects.
  • Figure 1 shows a conveyor 1, which is shown only schematically in the figure as a continuous conveyor belt. In a real system of this type, a number of subsidies with corresponding transfer elements can be provided one behind the other.
  • the can bodies 2-7 conveyed on the conveying device 1 are produced in a known manner in such a way that in a rounding station 8 a flat sheet is deformed into a can body, the longitudinal seam of which is not yet closed.
  • the longitudinal seam can be closed further along the conveyor path and is in any case brought to overlap in the roller seam welding machine 9, so that the seam of the can body is welded by means of the welding rollers 10 and 11 and generally a wire electrode can.
  • the welded can frames leave the welding machine and reach a coating station.
  • a coating station either only the weld seam or the entire inner wall of the frame is provided with a coating material.
  • this can be a coating powder which is applied inside the can.
  • Electrostatic charging of the powder can be provided in order to achieve good adhesion of the powder to the inner wall of the can.
  • the can body is then heat-treated, which causes the powder to melt. Subsequently, the coating becomes a finished hard coating by cooling.
  • the powder is applied to the inner wall of the can frame by mixing the powder from a storage container 14 in a mixing and conveying unit 15 with a gas stream which conveys the powder along the line 16 through the rounding station 8 and the welding machine 9 to the coating area.
  • the powder-air mixture is ejected and hits the inside of the can frame as ejected cloud 17, the shape of which may vary depending on the configuration of the ejection area of line 16 or the desired result of the inner coating.
  • the method described and the system shown are known. According to the invention, part of the fluid flow in line 16 is now removed from the line in front of the outflow region.
  • a suction line 18 is provided for this purpose, which opens into line 16 at a point 19 and which is connected at the other end to a vacuum source 20, which causes a part of the fluid flow in line 16 to be extracted.
  • the extracted fluid can be discharged into the environment after the vacuum source 20, wherein a filter can be provided which retains the powdery coating particles sucked together with the fluid.
  • the suction of part of the fluid flow brings about the advantages described at the beginning.
  • the conveying speed for the powder can be kept high by means of the compressed air in the line 16, which causes the powder to be conveyed properly along the long line.
  • the speed of the powder-air mixture after the suction point 19, ie in the area 22, is significantly lower, so that the powder particles strike the inner wall of the frame at a lower speed, which increases the application efficiency.
  • the amount of fluid flow sucked off can be varied by adjusting the vacuum source. The adjustment can be made empirically in such a way that, despite the suction, enough powder is deposited on the inside of the frame.
  • FIG. 2 shows a preferred embodiment of the front area of the line 16, which conveys the powder-air mixture.
  • the powder-air mixture is again conveyed through the line 16, at the outlet end 23 of which a mixture of powder and air emerges.
  • a portion of the flow in line 16 is also sucked off here by means of line 18, which opens into line 16 in a region 19 ′.
  • part of the wall of the line 16 to form a corresponding opening 24 is omitted.
  • a connecting element 25 connects the two lines 18 and 16 to one another and forms a closed connection space 19 ′ through which the line 18 communicates with the inside of the line 16 via the opening 24.
  • the total stream A of powder and air is now divided into the two sub-streams B and C in such a way that the returned Telistrom B consists essentially only of the fluid or air and contains no powder particles.
  • the partial stream B is removed here after a curved region 26 of the line 16, the centrifugal effect of this pipe curvature being exploited. Accordingly, the powder particles, which are heavier than the transport gas, move predominantly along the manifold wall on the right in the drawing and thus in region 27. In the cross-sectional area 28 of the manifold on the left in the drawing, transport gas predominantly free of powder particles flows through, which does not significantly reduce the amount of powder conveyed the line 18 can be suctioned off.
  • This embodiment results in a separation of gas which is necessary in terms of transport technology, but is disruptive in the spray area, from the gas-powder mixture. This also results in the advantages already described and other advantages.
  • the flow speed of the gas-powder mixture in stream C is reduced, so that the relative speed of the gas-powder stream to the can body to be coated, which is transported at a certain speed, is greatly reduced. This reduction means that the powder particles bounce less from the surface to be coated and thus the application efficiency is improved.
  • the powder particles conveyed at a certain speed are braked by the pressure increase and the associated speed decrease in the partial flow C as a result of the impulse effect, and are thus swirled into an almost homogeneous gas-air cloud over the entire line cross section in the area C.
  • the removal of the partial mass flow B in front of the spray chamber reduces the amount of transport gas to be discharged in the spray chamber, which can simplify the corresponding removal measures.
  • the pressure drop along line 16 is reduced, which leads to increased mass flow throughput with the same transport gas pressure.
  • flow lines 30 running in the direction of flow are shown, the distance from which represents the prevailing pressure. Furthermore, speed lines 31 are indicated, the distance a from which represents a measure of the flow speed. It can be seen that there is a high conveying speed at low pressure in the region of the stream A, which is desirable in order to convey the powder along the long line. In the area of the stream C, however, the extraction of the mass stream B results in the desired decrease in speed or an increase in pressure. The powder particles which are still traveling at high speed in the region 27 of the pipe bend reach this region of lower gas speed and higher pressure and, as already mentioned, swirl there to give the desired homogeneous mixture, at the same time as the flow A, being reduced.
  • the pipe curvature shown provides a simple means of separating the powder-air mixture into an area which predominantly contains only air and an area which contains powder and air.
  • other forms of curvature or other courses of the line 16 can be selected, which have a similar effect, or other release agents such as e.g. Baffles are used that have a similar effect.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Coating Apparatus (AREA)
EP96120821A 1996-02-21 1996-12-23 Procédé et appareil pour revêtir un objet Expired - Lifetime EP0791400B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH44796 1996-02-21
CH447/96 1996-02-21
CH44796 1996-02-21

Publications (2)

Publication Number Publication Date
EP0791400A1 true EP0791400A1 (fr) 1997-08-27
EP0791400B1 EP0791400B1 (fr) 2000-05-03

Family

ID=4187246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96120821A Expired - Lifetime EP0791400B1 (fr) 1996-02-21 1996-12-23 Procédé et appareil pour revêtir un objet

Country Status (5)

Country Link
US (1) US5863600A (fr)
EP (1) EP0791400B1 (fr)
JP (1) JPH09234413A (fr)
DE (1) DE59605130D1 (fr)
TW (1) TW341551B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109548206A (zh) * 2018-12-28 2019-03-29 泉州铭狮卫浴有限公司 石墨烯发热管的制作方法及石墨烯发热管、空气涂抹设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090123777A1 (en) * 2007-11-14 2009-05-14 Uct Coatings Llc. Method of improving the performance of a hydrodynamic surface

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2252736A1 (de) * 1972-10-27 1974-05-09 Metallgesellschaft Ag Verfahren zum transport von pulverlacken
US3901184A (en) * 1974-07-23 1975-08-26 Continental Can Co Pneumatic powder flow diverting device
DE2642587A1 (de) * 1975-10-03 1977-04-07 Masuda Senichi Elektrostatische farbauftrageinrichtung
EP0093083A2 (fr) * 1982-04-27 1983-11-02 Siegfried Frei Procédé pour appliquer une couche en poudre et appareil pour l'application de poudre
EP0120810A1 (fr) * 1983-03-21 1984-10-03 Siegfried Frei Procédé et appareil pour revêtir de poudre la soudure d'un boîte de conserve
US4500038A (en) * 1982-11-01 1985-02-19 Avco Corporation Powder feed system with recirculator for plasma spray apparatus
EP0192969A2 (fr) * 1985-02-21 1986-09-03 Präzisions-Werkzeuge AG Procédé et appareil pour prévenir le dépôt du revêtement sur la tête de pulvérisation
WO1987004643A1 (fr) * 1986-02-05 1987-08-13 Nordson Corporation Procede et pistolet de pulverisation de poudre par intermittence
US4886013A (en) * 1989-01-12 1989-12-12 Nordson Corporation Modular can coating apparatus
EP0732151A2 (fr) * 1995-02-17 1996-09-18 Nordson Corporation Méthode et appareil pour le revêtement par poudre de boîtes soudées

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259923A (en) * 1980-04-08 1981-04-07 The Continental Group, Inc. Reverse spray electrostatic air/powder stripe applicator
US4411935A (en) * 1981-11-02 1983-10-25 Anderson James Y Powder flame spraying apparatus and method
US5474609A (en) * 1992-06-30 1995-12-12 Nordson Corporation Methods and apparatus for applying powder to workpieces

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2252736A1 (de) * 1972-10-27 1974-05-09 Metallgesellschaft Ag Verfahren zum transport von pulverlacken
US3901184A (en) * 1974-07-23 1975-08-26 Continental Can Co Pneumatic powder flow diverting device
DE2642587A1 (de) * 1975-10-03 1977-04-07 Masuda Senichi Elektrostatische farbauftrageinrichtung
EP0093083A2 (fr) * 1982-04-27 1983-11-02 Siegfried Frei Procédé pour appliquer une couche en poudre et appareil pour l'application de poudre
US4500038A (en) * 1982-11-01 1985-02-19 Avco Corporation Powder feed system with recirculator for plasma spray apparatus
EP0120810A1 (fr) * 1983-03-21 1984-10-03 Siegfried Frei Procédé et appareil pour revêtir de poudre la soudure d'un boîte de conserve
EP0192969A2 (fr) * 1985-02-21 1986-09-03 Präzisions-Werkzeuge AG Procédé et appareil pour prévenir le dépôt du revêtement sur la tête de pulvérisation
WO1987004643A1 (fr) * 1986-02-05 1987-08-13 Nordson Corporation Procede et pistolet de pulverisation de poudre par intermittence
US4886013A (en) * 1989-01-12 1989-12-12 Nordson Corporation Modular can coating apparatus
EP0732151A2 (fr) * 1995-02-17 1996-09-18 Nordson Corporation Méthode et appareil pour le revêtement par poudre de boîtes soudées

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109548206A (zh) * 2018-12-28 2019-03-29 泉州铭狮卫浴有限公司 石墨烯发热管的制作方法及石墨烯发热管、空气涂抹设备
CN109548206B (zh) * 2018-12-28 2021-03-23 泉州铭狮卫浴有限公司 石墨烯发热管的制作方法及石墨烯发热管、空气涂抹设备

Also Published As

Publication number Publication date
US5863600A (en) 1999-01-26
TW341551B (en) 1998-10-01
DE59605130D1 (de) 2000-06-08
JPH09234413A (ja) 1997-09-09
EP0791400B1 (fr) 2000-05-03

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