EP0297422B1 - Vorrichtung zur elektrostatischen Sprühbeschichtung von plattenförmigen Werkstücken - Google Patents

Vorrichtung zur elektrostatischen Sprühbeschichtung von plattenförmigen Werkstücken Download PDF

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Publication number
EP0297422B1
EP0297422B1 EP88109966A EP88109966A EP0297422B1 EP 0297422 B1 EP0297422 B1 EP 0297422B1 EP 88109966 A EP88109966 A EP 88109966A EP 88109966 A EP88109966 A EP 88109966A EP 0297422 B1 EP0297422 B1 EP 0297422B1
Authority
EP
European Patent Office
Prior art keywords
holding strips
workpiece
conveyor
belt
workpieces
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.)
Expired - Lifetime
Application number
EP88109966A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0297422A3 (en
EP0297422A2 (de
Inventor
Werner Heine
Thomas Müller
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.)
Graco Verfahrenstechnik GmbH
Original Assignee
Graco Verfahrenstechnik GmbH
Boellhoff Verbindungstechnik GmbH
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 Graco Verfahrenstechnik GmbH, Boellhoff Verbindungstechnik GmbH filed Critical Graco Verfahrenstechnik GmbH
Priority to AT88109966T priority Critical patent/ATE60528T1/de
Publication of EP0297422A2 publication Critical patent/EP0297422A2/de
Publication of EP0297422A3 publication Critical patent/EP0297422A3/de
Application granted granted Critical
Publication of EP0297422B1 publication Critical patent/EP0297422B1/de
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
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects

Definitions

  • the invention relates to a device for the electrostatic spray coating of plate-shaped workpieces, with a conveyor which transports the workpieces at least through a coating zone and carries fastening elements which act on the workpiece and which simultaneously serve to ground the workpiece.
  • the invention has for its object to provide a device of the type described above, which enables secure attachment with good grounding.
  • fasteners have two retaining strips that receive an edge of each workpiece between them at least over most of its length and that the fasteners consist of an electrically conductive material.
  • the holding surface can be kept narrow, so that the non-coated edge area of the workpiece is very small. Since the holding surfaces are arranged on the inside of the holding strips and bear against the workpiece during coating, contamination of the holding surfaces is largely excluded. Because of the length of the holding surfaces, there are definitely sections over which a safe ground contact can be made. Another advantage is that there is surely a surface free of coating material at the edges of the workpieces. Should the workpiece therefore have to be gripped again by fastening elements in a later process section, it can be set up without difficulty that they attack the coating-free surface and are not soiled by coating material that is already present and softens during the treatment.
  • the holding strips run particularly advantageously. They therefore extend over the entire length of the edge of the workpiece and beyond to the next workpiece.
  • the holding surfaces can abut each other in the free space, so that there is no fear of contamination there either.
  • the workpieces can have different lengths in the transport direction without having to make a change.
  • endless tether strips are used that are in orbit. Repeated circulation is permitted because the holding surfaces are so protected that there is no risk of contamination. Of course, a cleaning zone can be run through for each cycle after leaving the working zones.
  • An alternative is to use finite holding strips that can be removed from a strip supply and can be fed to a collection point. This is particularly suitable for holding strips made of a material that is subsequently to be thrown away.
  • a recommended further development has a double conveyor, which has two holding strips for gripping each other on opposite parallel edges of the workpiece. This leads to an extremely stable holding of the workpiece during transport.
  • the working distance is precisely defined. There is no danger that the workpiece will move laterally under the influence of the mechanical forces of spray particles or of atomizing or shaped air. It is therefore also possible to use coating devices which release particles with a relatively large kinetic energy. This also applies in particular when the vertically arranged workpiece passes through two coating zones in succession, in which it is coated from both sides.
  • the path of the double conveyor can also be designed so that the workpieces cross their inclination to the horizontal during transport change to conveying direction.
  • the workpiece can therefore always be in such a position as is most favorable for the operation in question.
  • the path of the double conveyor can be designed such that the workpieces are picked up in the horizontal position between the holding strips, guided in the vertical position at least through one coating zone and put down again in the horizontal position.
  • the horizontal position is best for picking up stacked workpieces and for placing them in the stack, while the vertical position is recommended for coating, especially double-sided coating.
  • Other zones for evaporation, drying or cooling can be run through vertically or horizontally.
  • an endless elastic conveyor belt has holding strips formed integrally therewith along one edge, which act elastically against one another. This results in a very simple combination of conveyor belt and holding strip. Since small clamping pressures are sufficient, the inherent elasticity of the holding strips is sufficient in most cases. Otherwise, spring elements extending in the longitudinal direction, preferably embedded, can be provided.
  • the conveyor belt expediently has such a profiling that the two retaining strips are moved apart when two pressure elements engage externally. In the area of the pressure elements, the gap between the holding strips opens, so that the plate-shaped workpiece can be inserted between the holding strips or removed between them.
  • the profiling can consist of a longitudinal cavity adjacent to the holding strip and the pressure elements can engage in the area of the longitudinal cavity. This is a very simple embodiment.
  • the conveyor belt should have an outer longitudinal profile on both sides, on which support rollers engage. Such support rollers can also deflect the conveyor belt.
  • the conveyor belt has such a rigidity due to its material and / or cross section that it spans the coating zone in an unsupported manner in an upright position. There are then no guide parts within the coating zone that could become dirty there.
  • the conveyor is formed by a tape provided at its edges with adhesive, which can be bent in front of the coating zone along its longitudinal center to form holding strips, thereby engaging around a guide rail and with its edges being glued to the workpiece and can be cut behind the coating zone along the longitudinal center, the two halves of the tape being removable.
  • This tape can consist, for example, of paper, plastic film or the like, that is to say of a cheap disposable material.
  • the adhesive can be chosen so that the tape halves are easy to peel off. Because of the gluing over the entire length of the edge, relatively low adhesive forces per unit length are sufficient.
  • the guide rail runs through the coating zone, but is protected against contamination by the wrapping tape.
  • the tape can be peelable from a roll. Furthermore, the band halves can be wound on driven rollers. As a result, the belt acts as a conveyor.
  • profile rollers can be provided for bending the band and / or for supporting the guide rail. In most cases, it is not necessary to support the guide rail in the middle of the coating zone in this way.
  • the guide rail is preferably a round rod. This makes it easier to install and bend the tape.
  • plate-shaped workpieces 1 are coated with a liquid spray material.
  • the workpieces are circuit board blanks, which carry a thin copper layer on both sides and are coated with a photoresist, so that after subsequent exposure and the etching away of the unexposed parts, the remaining parts of the copper layer are the conductors form tracks.
  • a solder resist can be applied later in a similar device.
  • conveyor 2 with two superimposed conveyor belts 3 and 4, which grasp the workpieces at opposite edges over their entire length.
  • the conveyor belts 3 and 4 are deflected over a plurality of support rollers 5 to 10 and kept in circulation by a motor 11 driving the support roller 10. The following zones are run through:
  • a transfer device 13 equipped with suction devices picks up the uppermost workpiece of a stack 14 and pivots it into a vertical position in which it is gripped by the two conveyor belts 3 and 4 directly or after using an intermediate carrier.
  • An intermediate carrier moving in the conveying direction is required, for example, if the conveyor belts are driven continuously.
  • a device 16 is schematically illustrated, with the aid of which the workpieces can be fastened to the conveyors, as is explained in more detail in connection with FIG. 6.
  • a pre-cleaning zone 17 is provided in order to clean the workpieces with ionized blown air.
  • a first coating zone 18 has a closed housing 19, in which a coating device 20 is arranged.
  • This has a rotary atomizer 21 for mechanical atomization and a high-voltage electrode for ionizing these spray particles.
  • This high-voltage electrode which can also be formed by the rotary atomizer 21, is connected to a high-voltage source 22.
  • the two conveyors 3 and 4 consist of an electrically conductive material and are grounded, which can be done, for example, by grounding a support roller 9. The workpieces are therefore coated on one side in the coating zone 18.
  • a second coating zone 23 follows, which in turn has a closed space 24 with a coating device 25. This has a rotary atomizer 26. The associated high-voltage electrode is in turn connected to the high-voltage generator 22. In this coating zone 23, the workpieces are coated on the second side.
  • An evaporation zone 27 follows, which gives the applied lacquer time to form a uniform film.
  • Support rollers 28 are provided at the exit from the second coating zone.
  • the conveyor belts 3 and 4 can have such a sufficient rigidity that no further support takes place between the support rollers 10 and the support rollers 28, so there is also no risk that such rotating operating parts become inoperative due to the coating material over the course of time.
  • a drying zone 29 now follows. Drying can take place, for example, using IR radiators.
  • a controllable solvent suction device can also be connected.
  • a cooling zone 30 follows. Cooling can take place, for example, with filtered fresh air. A suction device for the resulting solvent can also be connected here.
  • the workpieces are detached from the conveyor belts 3 and 4 by means of a schematically indicated device 32 and placed on a stack 33 with the aid of a transfer device 32 ′, optionally again using intermediate carriers.
  • the conveyor 2 passes through a cleaning zone 34.
  • the cleaning can be carried out chemically, mechanically, with ultrasound or in another known manner.
  • the conveyor belt 3 has an outer longitudinal profile 36 and 37 on both sides, here in the form of a common bead 38. It consists of rubber-elastic material, which can be reinforced in the upper part by an elastic metal strip 39.
  • holding strips 40 and 41 are provided, which are held against each other due to their inherent elasticity.
  • An inner profile 42 in the form of a longitudinal cavity is provided near these holding strips. If pressure elements 43 and 44 engage in the form of rollers at the level of this profiling, the holding strips 40 and 41 diverge so that holding surfaces 45 and 46 are exposed. Now the plate-shaped workpiece 1 can be inserted between the holding strips 40, 41 without difficulty. If the pressure elements 43 and 44 are then removed, the holding strips 40 and 41 try to return to their rest position and clamp the workpiece 1 over its entire edge.
  • the material for the conveyor belts is selected so that it is resistant to the coating material at least on its surface and that it is made electrically conductive by itself or by the addition of additives or by a surface coating.
  • the electrical conductivity can be achieved by the inclusion of carbon particles.
  • a belt 203 serves as the conveyor 202 and is unwound from a supply roll 47. It is provided with an adhesive strip 48 and 49 on each of its two edges. Both the tape 203 and the two adhesive strips 48 and 49 are made of an electrically conductive material.
  • a guide rail 50 extends here over the entire working area, here in the form of a round bar, which is supported at least at its two ends via grounded supports 51 and 52.
  • the web can be made of crepe paper, for example.
  • a cutting device 65 is provided, which cuts the band 203 along its longitudinal center.
  • the two halves serving as holding strips 57 and 58 are pulled off to the side and wound up on driven rollers 66 and 67. This also results in the drive movement of the conveyor 202.
  • the tape material can then be thrown away.
  • the guide rail 50 is covered by the tape 203 during the entire coating process, so that it cannot become dirty.
  • the devices described can be operated continuously or step by step. In particular, fully automatic operation is possible.

Landscapes

  • Coating Apparatus (AREA)
  • Spray Control Apparatus (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacturing Of Printed Circuit Boards (AREA)
EP88109966A 1987-06-29 1988-06-23 Vorrichtung zur elektrostatischen Sprühbeschichtung von plattenförmigen Werkstücken Expired - Lifetime EP0297422B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88109966T ATE60528T1 (de) 1987-06-29 1988-06-23 Vorrichtung zur elektrostatischen spruehbeschichtung von plattenfoermigen werkstuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873721404 DE3721404A1 (de) 1987-06-29 1987-06-29 Vorrichtung zur elektrostatischen spruehbeschichtung von plattenfoermigen werkstuecken
DE3721404 1987-06-29

Publications (3)

Publication Number Publication Date
EP0297422A2 EP0297422A2 (de) 1989-01-04
EP0297422A3 EP0297422A3 (en) 1989-06-28
EP0297422B1 true EP0297422B1 (de) 1991-01-30

Family

ID=6330497

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109966A Expired - Lifetime EP0297422B1 (de) 1987-06-29 1988-06-23 Vorrichtung zur elektrostatischen Sprühbeschichtung von plattenförmigen Werkstücken

Country Status (6)

Country Link
US (1) US4867099A (es)
EP (1) EP0297422B1 (es)
JP (1) JPH0777632B2 (es)
AT (1) ATE60528T1 (es)
DE (1) DE3721404A1 (es)
ES (1) ES2021119B3 (es)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4900580A (en) * 1987-10-22 1990-02-13 Klaus Grah Process for the electrostatic lacquering of printed circuit boards
DE3937071A1 (de) * 1989-11-07 1991-05-08 Kopperschmidt Mueller & Co Vorrichtung und verfahren zum beschichten von plattenfoermigen substraten, wie leiterplatten
US5188669A (en) * 1991-02-22 1993-02-23 Nordson Corporation Circuit board coating apparatus with inverting pallet shuttle
TW220028B (en) * 1992-08-24 1994-02-01 Ciba Geigy Ag Method and apparatus for coating board-shaped articles, especially printed circuit boards
FR2715200B1 (fr) * 1994-01-19 1996-08-30 Prokap Sarl Dispositif d'accrochage de pièces à peindre pour installations de peinture électrostatique.
GB9405823D0 (en) * 1994-03-24 1994-05-11 Royal Doulton Ltd Method and apparatus for turning ceramic ware
DE10057201C1 (de) * 2000-11-17 2002-09-05 Brangs & Heinrich Gmbh Bei einer Anlage zum Lackieren zu verwendende Vorrichtung zur elektrisch leitenden Verbindung einer Hakenpartie mit einem benachbarten Teil
DE10200555A1 (de) * 2002-01-09 2003-07-10 Krones Ag Vorrichtung und Verfahren zum Beschichten von Behältern
US20050110208A1 (en) * 2003-11-26 2005-05-26 Kansa Technology, Llc Transporter for delivering secondary supply of inserts to a packet of primary multiple packet inserter apparatus
TWI356036B (en) * 2004-06-09 2012-01-11 Smithkline Beecham Corp Apparatus and method for pharmaceutical production
US8101244B2 (en) * 2004-06-09 2012-01-24 Smithkline Beecham Corporation Apparatus and method for producing or processing a product or sample
US20060032730A1 (en) * 2004-08-13 2006-02-16 Kaufman Paul J Belt conveyor apparatus
ITMI20051388A1 (it) * 2005-07-20 2007-01-21 Trevisan Cometal S P A Dispositivo e procedimento di verniciatura di elementi metallici
US7611584B2 (en) * 2005-12-13 2009-11-03 Lg Electronics Inc. Electroless metal film-plating system
GB2491388B (en) * 2011-06-02 2014-07-30 Illinois Tool Works Suspension device
CN111957527A (zh) * 2020-08-05 2020-11-20 芜湖莫森泰克汽车科技股份有限公司 天窗滑轨粘接蘑菇搭扣设备

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286817A (en) * 1966-11-22 Brigham chain carrier clip
US2684656A (en) * 1949-07-30 1954-07-27 Ransburg Electro Coating Corp Electrostatic coating apparatus
US3168885A (en) * 1959-03-13 1965-02-09 Cornell Dubilier Electric Method and apparatus for the manufacture of capacitors
US3120892A (en) * 1959-12-04 1964-02-11 Arenco Ab Conveyor
GB922657A (en) * 1959-12-04 1963-04-03 Arenco Ab Improvements in endless conveyors
DE2204982B1 (de) * 1972-02-03 1973-08-16 Weck Glaswerk GmbH, 5300 Bonn Verfahren zum beschichten eines gegenstandes aus glas, porzellan, steingut
CH593720A5 (es) * 1975-01-17 1977-12-15 Gema Ag
US4226324A (en) * 1978-05-08 1980-10-07 Bell & Howell Company Article turnover assembly
JPS57165065A (en) * 1981-04-01 1982-10-09 Kansai Paint Co Ltd Inhibition of adhesion of powdery paint to hanging support
US4450954A (en) * 1982-01-25 1984-05-29 Graco Inc. Electrostatic spray support
US4499120A (en) * 1982-09-29 1985-02-12 General Dynamics, Pomona Division Method for solder tinning of component leads
US4440485A (en) * 1983-01-17 1984-04-03 Pennwalt Corporation Apparatus for continuously automatically processing a plurality of dental X-ray films
DE3340510C2 (de) * 1983-11-09 1986-10-30 Hans-Josef 5010 Bergheim Licher Elektrostatische Pulverbeschichtungsvorrichtung
DE3420453A1 (de) * 1984-06-01 1985-12-05 Hell GmbH & Co Kunststoffbeschichtung KG, 2351 Trappenkamp Haltevorrichtung fuer zweifarbig zu beschichtende metallprofile
GB8425574D0 (en) * 1984-10-10 1984-11-14 Beldray Ltd Spraying system
DE3505618A1 (de) * 1985-02-19 1986-08-21 Kopperschmidt-Mueller Gmbh & Co Kg, 4800 Bielefeld Verfahren zum beschichten von gegenstaenden mit hilfe eines spruehstrahls und vorrichtung zur durchfuehrung dieses verfahrens
US4643129A (en) * 1985-09-13 1987-02-17 Ets Energy Technology Systems Inc. System for the treatment of edge supported substrates
US4656051A (en) * 1985-09-16 1987-04-07 Wojcik Paul E Method for electrostatic coating threaded fasteners with a thermoplastic resin
US4775046A (en) * 1986-01-17 1988-10-04 Future Automation, Inc. Transport belt for production parts

Also Published As

Publication number Publication date
JPH0777632B2 (ja) 1995-08-23
US4867099A (en) 1989-09-19
EP0297422A3 (en) 1989-06-28
EP0297422A2 (de) 1989-01-04
DE3721404C2 (es) 1990-04-26
ES2021119B3 (es) 1991-10-16
DE3721404A1 (de) 1989-01-12
ATE60528T1 (de) 1991-02-15
JPS6418462A (en) 1989-01-23

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