EP0588003A2 - Cabine de revêtement - Google Patents

Cabine de revêtement Download PDF

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Publication number
EP0588003A2
EP0588003A2 EP93110520A EP93110520A EP0588003A2 EP 0588003 A2 EP0588003 A2 EP 0588003A2 EP 93110520 A EP93110520 A EP 93110520A EP 93110520 A EP93110520 A EP 93110520A EP 0588003 A2 EP0588003 A2 EP 0588003A2
Authority
EP
European Patent Office
Prior art keywords
layer
coating booth
cover
core layer
adhesive
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
EP93110520A
Other languages
German (de)
English (en)
Other versions
EP0588003A3 (en
EP0588003B1 (fr
Inventor
Konrad Zobrist (Colasit Ag)
Horst Dr.(Wagner International Ag) Adams
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.)
Colasit AG
Wagner International AG
Original Assignee
Colasit AG
Wagner International 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 Colasit AG, Wagner International AG filed Critical Colasit AG
Publication of EP0588003A2 publication Critical patent/EP0588003A2/fr
Publication of EP0588003A3 publication Critical patent/EP0588003A3/de
Application granted granted Critical
Publication of EP0588003B1 publication Critical patent/EP0588003B1/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
    • B05B16/00—Spray booths
    • B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/40—Construction elements specially adapted therefor, e.g. floors, walls or ceilings

Definitions

  • the invention relates to a coating booth for an electrostatic powder coating system, on the end faces of which passages are provided for the workpieces to be coated and the walls of which consist of a layered composite material which has at least two cover layers which are separated by at least one core layer, at least a first of the cover layers an electrical non-conductive material.
  • Powder coating booths serve to temporarily hold a workpiece to be coated with powder, to which a powder cloud is fed through one or more openings in the cabin wall by means of electrostatic powder spray guns. Due to the voltage potential between the powder cloud and the workpiece, the powder is largely deposited on the workpiece. Excess powder that does not get stuck on the workpiece is either sucked off and filtered by a generated air flow and / or sinks to the cabin floor and is conveyed to the outside by means of a conveyor belt. The powder thus recovered can then be reprocessed and returned to the coating cycle.
  • a coating booth of the type described above is known for example from EP-A-0 200 681.
  • This publication describes a powder coating booth in which the booth walls consist entirely of electrically non-conductive material, and in particular are constructed from a polyurethane core which has a PVC coating on its inside and a plastic coating on its outside.
  • the charged powder particles are also attracted to the outside of the cabin by grounded metal parts, such as metal support frames, because the electrostatic forces "penetrate" through a non-conductive wall.
  • the outer metal parts are formed like a projection on the inside of the cabin by adhering powder.
  • a high static potential is also formed on the outside of the cabin walls, which consist exclusively of non-conductive material, i.e. a "mirror charge" of the charged inner wall, according to the capacitor principle, because practically no charge can flow off the outer wall.
  • This external charge poses a security risk; if there is sufficient potential, electrical flashovers from the outer wall to surrounding grounded objects can occur.
  • the invention provides a coating booth which is constructed from modular layer composite elements.
  • the layer composite elements consist of at least two outer layers, an inner and an outer, which are separated by at least one core layer, preferably the outer outer layer being electrically conductive and preferably the inner outer layer being electrically non-conductive or both outer layers being non-conductive and being between the outer cover layer and the core layer is a conductive separation layer.
  • a Faraday cage is practically formed by the conductive cover or intermediate layer in the wall, which reliably prevents electrical penetration through the wall. This ensures that no powder precipitate forms on the inner walls due to outer metal parts. This certainly prevents the build-up of a "mirror charge" on the outside wall of the cabin, because the conductive layer represents one side of the capacitor, which, if properly grounded, cannot build up any potential.
  • layered composite elements are surrounded by circumferential webs which are offset at right angles and which give the modules the necessary inherent stability.
  • the individual modules can then be screwed together on the surrounding webs to build the actual coating booth.
  • the nature of the surface of the inner shell of the powder coating booth and the closure of joints and corners is carried out so that the advantage of itself known plastic inner walls of such cabins, namely the easy cleaning of powder particles, is retained.
  • the layered composite elements preferably consist of flame-retardant materials, corresponding to fire classes B1 or A2, for example of hard PVC.
  • the layered composite elements are particularly suitable for the construction of cabin walls in powder coating systems. However, they can also be used in other system parts, for example for fan housings, housings for filters or filter systems, containers for liquid or solid substances, as partitions, covers or the like.
  • the core layer 12 can, for example, be formed from a polyurethane foam plate, on the surfaces of which plastic plates or plastic films are applied as cover layers 10 on both sides.
  • the layered composite components should be designed as flame-retardant bodies, corresponding to fire class B1, or as non-combustible bodies, according to fire class A2.
  • B1-PVC for example, can be used for the cover layers.
  • the condition of at least the surface of the cover layer, which later forms the inner wall of the powder coating booth, is such that adhering powder particles can be easily cleaned off.
  • one cover layer 14 is electrically non-conductive and the other cover layer 16 is electrically conductive. Both cover layers 14, 16 are in turn separated by the core layer 12.
  • the electrically conductive cover layer 16, which later forms the outer wall of the powder coating booth, is preferably made of an electrically conductive plastic. However, it can also be formed by introducing an electrical conductor into a plastic that is not conductive per se or consist of another electrically conductive material.
  • both cover layers 18, 20 consist of an electrically non-conductive material, preferably plastic, an electrically conductive separating layer 22 being introduced between the core layer 12 and the cover layer 20 serving the outer outer wall .
  • This electrically conductive separating layer 22 can consist of a film or a thin one Plate made of metal or an electrically conductive plastic.
  • a conductive separating layer in the form of a film 22 is bonded to the inside of an approximately 6 mm thick, non-conductive outer cover layer 18 made of polyvinyl chloride (PVC), which prevents the build-up of a static potential on the outside of the cover layer 14.
  • the "core layer” consists of spacers 29 made of PVC, the spaces between which can remain free or filled with polyurethane foam. The inner ends of the spacers 29 are glued to the inside of a likewise approximately 6 mm thick, non-conductive inner PVC cover layer 20, which forms the inner wall of the cabin.
  • the layer composite element according to FIG. 4 is in particular lighter when the gaps between the spacers 29 are left than that according to FIG. 2 or 3 with sufficient stability.
  • a double-sided adhesive film 24 or a plastic adhesive is first applied to the inner surface of the electrically non-conductive cover layer 14, and this cover layer 14 is then applied to the side on which the adhesive layer is applied Core layer 12 connected.
  • An adhesive layer 25 is then applied to the free surface of the core layer 12 and is then connected to the electrically conductive cover layer 16.
  • the layer composite element prepared in this way is introduced into a vacuum chamber 26 which can be closed in an airtight manner by means of a cover film 28 and a holding frame 30, and the chamber 26 is closed. With a vacuum pump 32, a vacuum of at least 0.5 bar is generated in the interior of the closed chamber 26.
  • the layered composite element is exposed to this negative pressure for a predetermined period of time, and the individual layers are thereby pressed together.
  • the pressing time can be very short if a double-sided adhesive film is used, or it corresponds to the curing time of the adhesive used if a plastic plastic was used.
  • 3 or 4 corresponds to the method just described, with an electrically conductive separating layer 22 being additionally inserted between the core layer 12 and the corresponding cover layer 20 or 18.
  • This electrically conductive separation layer 22 is also provided with a double-sided adhesive film 24 or a plastic adhesive layer 25.
  • the layered composite elements produced in the manner described can be used to produce powder coating booths according to FIG. 6.
  • the layer composite elements are designed as individual modules 33 of the powder coating booth and are provided with circumferential webs 34 which are offset at right angles. These webs give the modules 33 the necessary inherent stability. Furthermore, the modules can be screwed together on the circumferential webs 34, so that the coating booth can be easily assembled and disassembled at any location.
  • the modules 33 forming the side walls of the powder coating booth have openings 36 for the passage of powder coating guns and the like.
  • the electrically conductive cover layer or that side of the layer composite element in which a conductive separating layer 22 is inserted between the cover layer and the core layer forms the outer wall of the powder coating booth and if the electrically non-conductive cover layer 14 or 18 forms the inner wall of the powder coating booth .
  • the housing for fans for extracting the powder-air mixture in the cabin interior can also be produced in the layered composite construction described above. These can be integrated as modules in the cabin design or as individual modules located on or in the powder coating cabin.
  • the material for the electrically conductive cover layer 16 or the electrically conductive separating layer 22 should have a surface resistance of less than 104 ohms.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Laminated Bodies (AREA)
EP93110520A 1992-09-14 1993-07-01 Cabine de revêtement Expired - Lifetime EP0588003B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2881/92A CH685005A5 (de) 1992-09-14 1992-09-14 Schichtverbundkörper, Verfahren zu dessen Herstellung und Erzeugnisse aus denselben.
CH2881/92 1992-09-14

Publications (3)

Publication Number Publication Date
EP0588003A2 true EP0588003A2 (fr) 1994-03-23
EP0588003A3 EP0588003A3 (en) 1994-07-06
EP0588003B1 EP0588003B1 (fr) 1997-09-24

Family

ID=4243688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110520A Expired - Lifetime EP0588003B1 (fr) 1992-09-14 1993-07-01 Cabine de revêtement

Country Status (3)

Country Link
EP (1) EP0588003B1 (fr)
CH (1) CH685005A5 (fr)
DE (1) DE59307423D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1400347A3 (fr) * 2002-09-20 2005-10-19 Nordson Corporation Améliorations relatives à des systèmes de revêtement sous forme de poudre

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6830620B2 (en) 2000-04-14 2004-12-14 Nordson Corporation Powder coating booth containment structure
US6730167B2 (en) 2000-10-05 2004-05-04 Nordson Corporation Powder coating spray booth with a powder extraction system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0402604A2 (fr) * 1989-06-15 1990-12-19 ITW Gema AG Dispositif pour le revêtement par pulvérisation électrostatique de poudre
FR2650764A1 (fr) * 1989-08-09 1991-02-15 France Composit Enceinte pour la projection, sur des objets, de produits en poudre tels que des peintures par exemple

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0402604A2 (fr) * 1989-06-15 1990-12-19 ITW Gema AG Dispositif pour le revêtement par pulvérisation électrostatique de poudre
FR2650764A1 (fr) * 1989-08-09 1991-02-15 France Composit Enceinte pour la projection, sur des objets, de produits en poudre tels que des peintures par exemple

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1400347A3 (fr) * 2002-09-20 2005-10-19 Nordson Corporation Améliorations relatives à des systèmes de revêtement sous forme de poudre

Also Published As

Publication number Publication date
EP0588003A3 (en) 1994-07-06
CH685005A5 (de) 1995-02-28
EP0588003B1 (fr) 1997-09-24
DE59307423D1 (de) 1997-10-30

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