EP0376222B1 - Procédé et appareillage pour le dépôt par électrophorèse d'une laque sur de petits objets en vrac - Google Patents
Procédé et appareillage pour le dépôt par électrophorèse d'une laque sur de petits objets en vrac Download PDFInfo
- Publication number
- EP0376222B1 EP0376222B1 EP89123856A EP89123856A EP0376222B1 EP 0376222 B1 EP0376222 B1 EP 0376222B1 EP 89123856 A EP89123856 A EP 89123856A EP 89123856 A EP89123856 A EP 89123856A EP 0376222 B1 EP0376222 B1 EP 0376222B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conveyor belt
- small parts
- loose goods
- bath
- dipping bath
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000010422 painting Methods 0.000 title abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 23
- 238000000576 coating method Methods 0.000 claims abstract description 23
- 238000007654 immersion Methods 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 12
- 239000008237 rinsing water Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000000909 electrodialysis Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims 21
- 210000003298 dental enamel Anatomy 0.000 claims 12
- 238000005137 deposition process Methods 0.000 claims 2
- 238000001652 electrophoretic deposition Methods 0.000 claims 2
- 238000005507 spraying Methods 0.000 claims 1
- 239000000758 substrate Substances 0.000 abstract 4
- 239000003973 paint Substances 0.000 description 47
- 239000013590 bulk material Substances 0.000 description 18
- 238000003618 dip coating Methods 0.000 description 12
- 238000004070 electrodeposition Methods 0.000 description 12
- 239000004922 lacquer Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 9
- 239000002356 single layer Substances 0.000 description 5
- 238000000151 deposition Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000001962 electrophoresis Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000000108 ultra-filtration Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000012465 retentate Substances 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
Definitions
- the invention relates to a method for electrophoretic (anodic and preferably cathodic) dip coating of small parts with an electrically conductive surface wettable by the paint, for.
- small metal parts as well as small parts made of non-metals, in particular metallized small parts made of ceramic or thermostable organic polymeric materials, with water-dilutable paints, in particular with water-based paints and a device for implementing the method.
- Electrophoretic dip coating is state of the art for hanging or racked goods; one example: the cataphoretic coating of body parts in the automotive industry.
- the part is cleaned (degreasing, pickling) with a layer to improve corrosion protection or to promote adhesion (e.g. phosphating and subsequent immersion in dilute chromic acid) and electrocoated.
- the goods to be painted must be brought to the same electrical potential of the corresponding electrode. No paint is deposited at the contact points between this electrode and the goods.
- Frames are used to move the contacts between the frame, which serves as the electrode, and the goods in areas where unpainted areas can be accepted.
- the electrophoretic dip coating of small parts is described in BE-PS-695 619. There, small parts are guided through an electro-immersion bath using a conveyor belt. The conveyor belt has knobs and hooks which are intended to improve the mechanical contact of the small parts with the conveyor belt.
- US Pat. No. 3,616,392 describes the electrophoretic dip coating of small parts, these small parts being transferred within an electro-dip bath to a first transport device with containers and from this to a second transport device with containers. Adhering gas bubbles are removed in this way, but complete painting is not possible.
- DE-AS 22 32 162 describes the electrophoretic dip coating of small parts on a conveyor running through an electrodeposition bath. According to this process, it is ensured that the small parts cannot move on the conveyor belt during the painting process. This state of the art does not overcome the disadvantage of inadequate coating of the surfaces of small parts. In addition, there are difficulties with the continuous process management.
- US-A-3,682,136 discloses a container in which the small parts to be coated migrate by vibration. Electrodes are attached so that the small parts in the container can be coated electrically.
- US-A-3,898,151 discloses magnetizable drums which transfer the small parts to be coated between two coating steps from one conveyor belt to a second.
- the object of the invention is a complete painting of small parts or bulk goods by electrophoresis. Good corrosion protection is to be achieved in this way.
- this object can be achieved by changing the position of the small parts or bulk materials to be painted on their base in the electro-immersion bath. After one The previous contact plates between the small parts and their base, or between the small parts with one another and / or contact electrodes, are accessible to the paint. Knowing the prior art, which avoids a displacement, it was not to be expected that the electrical contact through the insulating lacquer layer would be sufficient to enable the original contact points which were exposed after the change in position and were not yet lacquered to be lacquered.
- a single-layer layer of the small parts is preferred, as a result of which good electrical contact between the individual small parts and their z. B. used as an electrode pad, indirect contacts over one or more small parts avoided and the paint inaccessible areas prevented by superimposed small parts.
- the single-layer layer of the small parts during the rinsing process facilitates the effective removal of excess paint, and the single-layer layer in the stoving oven prevents the small parts from sticking together.
- the small parts to be painted are transported on a conveyor belt as a base through the electrocoating bath.
- an electrically conductive conveyor belt can be used, which is provided with an electrically insulating coating, with the exception of the surfaces required for switching as an electrode and for contacting the small parts.
- This conveyor belt is used as an electrode.
- paint is also deposited on such a conveyor belt. In this case, the conveyor belt should not be led into the stoving oven with the lacquered small parts, since the stoved lacquer can only be removed with great effort.
- the conveyor belt is preferably grounded. Only the bath liquid in the bath is under tension for electrophoretic dip painting. In this case, the required safety measures can be implemented with less effort than with a live conveyor belt.
- a conveyor belt with an electrically non-conductive surface can be guided with the small parts on it through the electrocoating bath and then through the downstream rinsing device and through the baking oven, provided that the conveyor belt is thermally stable at the temperatures required for the baking process.
- the belt speed is a parameter for setting the coating layer thickness.
- the throughput rate of such a continuous coating system can be fine-tuned using the belt speed.
- the order of magnitude of the throughput can be determined by designing the width of the conveyor belt.
- the entry and exit angles of the conveyor belt in the lacquer bath for example a maximum of 15 degrees, sliding of small parts and bulk goods on the conveyor belt can generally be prevented.
- a conveyor belt with drivers is preferably used for small rolling parts, in particular such workpieces with rotationally symmetrical geometry, or for steeper insertion and removal angles of the painting belt.
- Stationary or mobile belt guiding devices force the conveyor belt in the paint bath at certain points or brief changes in the conveying direction, so that the small parts are relocated on the conveyor belt and the unpainted contact surfaces between the goods and the belt are changed.
- the change of the contact surfaces can also be done by moving parts of an articulated conveyor belt against each other, or by sudden shocks.
- Paint is dragged out of the immersion bath by the conveyor belt. This varnish can be easily removed before baking.
- the non-coagulated paint portion can be easily removed by simply rinsing.
- the conveyor belt can run through a tunnel saturated with paint solvent vapor during the return to the loading station be performed.
- the small parts to be painted can be immersed in trays or in swivel drums, which each form the base, in the electrocoating bath.
- the angle at which the container with the small parts can be pivoted, and the drum filling, are chosen so that the small parts change their position relative to one another or in the container during a pivoting process.
- the relocation can take place under water.
- these trays can also be used as electrodes.
- these trays with the lacquered small parts can also be passed through the rinsing device and the baking oven if the trays are thermally stable at the temperatures required for the baking process.
- this base is provided with a surface that is not wetted by the paint.
- changes in the position of the small parts on the support in the baking oven can also be made.
- the conveyor belt is guided on a certain path through the electric immersion bath by a lateral guide.
- a stainless steel conveyor belt prevents corrosion products from getting into the paint bath.
- the conveyor belt can be provided with an electrically insulating coating except for the belt surfaces required for through-contacting the conveyor belt and for contacting the small parts.
- the conveyor belt can be electrophoretically painted and baked with the paint used.
- a plane-parallel arrangement of the conveyor belt and counterelectrode creates the same conditions across the entire width of the belt and thus promotes the uniformity of the coating.
- the electro-immersion bath and bath volume can be dimensioned significantly smaller, since the distance required for the paint circulation in the case of a plane-parallel arrangement between the base of the bath and the paint bath also serves as a safety distance between the electrodes.
- counter electrodes can be moved to adapt to the various small parts and to optimize the coating.
- Drive chains on both sides of the conveyor belt make it possible to implement a simple drive option with simultaneous lateral guidance of the conveyor belt.
- this can be used to make electrical contact with articulated conveyor belts.
- Synchronous running of the drive rollers before immersion and after exiting the electro-immersion bath enables a tension-free conveyor belt guide, which is essential for belt deflection by means of, for example, baffles.
- the synchronization can e.g. B. can be realized by a coupled chain drive.
- a base which is electrically conductive and has an electrically insulating coating, preferably made of the same lacquer on which the electrodeposition bath is based, in baked form, with only the points for contact with the bulk material and for switching as an electrode Do not have coating. For example, it can be ground down at these points.
- an insulating base for example a completely coated one
- To use pad and to bring the small parts lying on this pad into contact with an electrode in the electro-immersion bath for example by placing a flexible electrode, for example. This put on the electrode or the contact can be done on a base which is designed as a conveyor belt or as a container, for example a tray.
- the pad is conductive or electrically non-conductive, and regardless of whether it is a conveyor belt or container-shaped devices, the position of the small parts to be painted or the bulk material in the electro-immersion bath is changed, for example by sudden shock .
- the electrodes inserted from above can be removed at the latest before entering the baking oven. All or part of the electrodes are provided with an electrically insulating coating, which is preferably the same lacquer (in baked form) as is used in the electrodeposition bath. Only the surfaces of the electrodes required for contact with the small parts or the bulk material are excluded from the coating.
- the small parts can either be relocated to another conveyor belt or to further trays on which the rinsing in the rinsing device and the baking of the paint take place in a baking oven. It is advantageous if the conveyor belt used for the baking or other trays have surfaces that are not wetted by the paint in the baking oven. It is favorable to change the position of the small parts or the bulk material on the further conveyor belt or the further trays in the baking oven at least once.
- the invention also relates to a device for electrophoretic dip coating of small parts and bulk materials which is suitable for carrying out the method according to the invention, which comprises a bath tank for electro-dip coating, a rinsing device and a stoving oven, and is characterized in that a conveyor belt with a device to the task of the small parts to be painted or the bulk material is arranged outside the container so that it can be inserted into the container at a variable angle and can be re-executed therefrom, the conveyor belt consisting of a material with high electrical conductivity and with the exception of that for electrical contact and the outer belt surfaces required for contacting the small parts to be painted or the bulk material are provided with an electrically insulating coating, in particular the paint used and baked for painting in the electro-immersion bath, and devices for changing the conveying direction of the conveyor belt in the bath container for shifting of parts of the conveyor belt, for moving the small parts or the bulk material on the conveyor belt or for the sudden shock of the conveyor belt.
- the conveyor belt is preferably endless and, after exiting the electro-immersion bath, can be fed back into the electro-immersion bath via a rinsing device for the painted small parts or the painted bulk material and for cleaning the conveyor belt in the form of a rinsing device and a cleaning brush for the outer belt surface.
- the conveyor belt can be provided with a lateral guide. According to a preferred embodiment, it is provided with drivers for the small parts.
- the container for the electrodeposition bath contains one or more counterelectrodes encapsulated in electrodialysis pockets, which are preferably arranged plane-parallel to the conveyor belt.
- Devices for shifting the position of the counter electrodes can be contained in the electro-immersion bath.
- the conveyor belt is preferably provided with drive chains on one or both sides.
- the conveyor belt is preferably moved over drive rollers, which are preferably synchronously switched, in order to enable the conveyor belt to move without slip and tension.
- a further conveyor belt for receiving the small parts or the bulk material can follow the conveyor belt emerging from the container of the electro-immersion bath, this further conveyor belt serving to pass through a rinsing device for the painted small parts.
- This additional conveyor belt can also be used to introduce the painted small parts into the baking oven.
- the conveyor belt which runs through the baking oven is preferably made of a material or coated with a material which is not wetted by the paint to be baked and which is thermally stable with respect to the required baking temperatures.
- the conveyor belt that passes through the electro-immersion bath, as well as the conveyor belt that passes through the stoving oven are designed in such a way that only small contact surfaces with the small parts are possible.
- the conveyor belt can be designed, for example, as a spiral wire belt with a round or triangular profile of the spirals. It is convenient if the material of such spirals is stainless steel.
- a slide loaded with water film can be provided.
- a device for continuous electrophoretic dip coating of small parts by the method according to the invention is described below by way of example.
- the structure of the device is shown in Fig. 1.
- a vibration conveyor From a feed device (5), for. B. a vibration conveyor, the small parts or bulk goods (6) to be painted are placed on the conveyor belt (4) in a single layer. This type of task with a vibration conveyor is particularly recommended for thin and flat small parts such as washers.
- a task on a conveyor belt with drivers that prevent the small parts from rolling on the conveyor belt is more suitable, or on a conveyor belt with a profile that prevents it from rolling off.
- a single-layer product layer can be ensured by a slide behind the feed device, not shown in FIG. 1, which is adjustable in height above the conveyor belt.
- the conveyor belt (4) dips into the paint bath (7) at an angle of less than 15 degrees. Small parts and bulk goods can usually be prevented from sliding by such a small immersion angle.
- Both the pre-rinsing (10) of the small parts on the conveyor belt (4) after they have emerged from the electrocoating bath (7) and the rinsing on the conveyor belt (12) in the rinsing device (2) are carried out simultaneously from above and below.
- the small parts are transferred from the conveyor belt (4) to the conveyor belt (12) - as shown in FIG. 3 - via a slide loaded with a water film (50) or, as in FIG. 1, via a slide (17) which rinses the small parts from above and below at the same time. If required, the transfer from the conveyor belt (12) to the conveyor belt (13) can also take place via such a slide.
- the conveyor belt (4) is passed through a basin (14) with rinsing water (15) in which the paint adhering to this conveyor belt is redissolved.
- the metallic contact surfaces of the conveyor belt are stripped by a cleaning brush (16) either when immersing - as shown in FIG. 1 - when they are being immersed or while the sink is running through.
- the cleaning brush (16) is rinsed with rinsing water from the rinsing device (35).
- the rinsing water (15) and the electrodeposition paint (7) are fed to a device for ultrafiltration (11) via a filter (36) and a heat exchanger (37).
- the retentate (9) with the lacquer that has been dragged out is returned to the immersion tank (1) for cataphoretic immersion lacquering.
- the permeate (28) from the ultrafiltration is fed to the circulation flushing device (2).
- the rinsing water returns from the rinsing device (2) to the ultrafiltration (11).
- the rinsing water (15) in the sink (14) can be drained off via the drain line (8).
- the pumps (21) and (22) circulate the paint (7) according to the paint manufacturer's instructions. These pumps (21) and (22) are designed so that the required bath movement can be achieved by one pump alone. Since sedimentation of the paint particles occurs even with short downtimes, a second pump is installed to ensure the bath movement.
- the basin (14) is part of a container (23) saturated with solvent vapor, in which the conveyor belt (4) is returned to the feed device (5). This return to saturated solvent vapor prevents the paint residues from drying which could not be removed from the conveyor belt by the cleaning brush (16) and in the sink (14).
- the conveyor belt (4) is earthed via the sliding contact (19).
- a position of the anode in the vicinity of the point at which the conveyor belt (4) emerges from the lacquer liquid (7) in the immersion bath (1) is preferred, since the current peaks are lowest when immersed.
- Another preferred position, not shown in FIG. 1, is an arrangement of the counter electrode (18) below the conveyor belt (4) and parallel to the conveyor belt (4).
- the counter electrode (18) is part of an encapsulated electrodialysis cell.
- the electrolyte of the encapsulated counter electrode (18) is exchanged and regenerated via the lines (25) and (26).
- the desired potential is applied to the counter electrode via the electrical supply line (24).
- the coating tape (4) can be transported without the tape tension normally required, which enables a tape sag and a tape deflection.
- the non-traceable entrainments from the paint bath (7) are compensated in the postdosing station (31) by paint refill material (32) on the one hand and on the other hand by demineralized water (33) metered via level sensor (34).
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating Apparatus (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Drying Of Solid Materials (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
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Claims (34)
- Procédé de trempage électrophorétique de petites pièces et de produit en vrac à surface électriquement conductrice, par immersion dans un bain aqueux de trempage électrophorétique, dépôt électrophorétique de laque, sortie du bain de trempage, rinçage et cuisson du revêtement de laque déposé, dans lequel les petites pièces ou le produit en vrac à laquer sont disposés sur une bande transporteuse à haute conductibilité électrique qui peut être raccordée comme électrode et sont immergés avec cette bande dans le bain de trempage électrophorétique et en sont sortis de nouveau avec la bande transporteuse après le dépôt, la bande transporteuse étant pourvue d'un revêtement électriquement isolant à l'exception des surfaces nécessaires au raccordement comme électrode et la mise en contact avec les petites pièces ou le produit en vrac, et les surfaces de contact entre les petites pièces ou le produit en vrac et la bande transporteuse raccordée comme électrode ainsi que des surfaces éventuelles de contact entre les petites pièces ou à l'intérieur du produit en vrac étant au moins modifiées une fois dans le bain de trempage électrophorétique en guidant la bande transporteuse sur des chicanes stationnaires ou mobiles, en déplaçant des parties de la bande transporteuse l'une par rapport à l'autre et/ou en inversant le sens de mouvement de ces parties, ou en communiquant des vibrations du type chocs à la bande transporteuse.
- Procédé de trempage électrophorétique de petites pièces et de produit en vrac à surface électriquement conductrice, par immersion dans un bain aqueux de trempage électrophorétique, dépôt électrophorétique de laque, sortie du bain de trempage, rinçage et cuisson du revêtement de laque déposé, dans lequel les petites pièces ou le produit en vrac à laquer sont disposés sur un support et immergés avec celui-ci dans le bain de trempage électrophorétique et en sont sortis de nouveau avec le support après le dépôt, une mise en contact des petites pièces ou du produit en vrac étant réalisée dans le bain de trempage électrophorétique au moyen d'une électrode qui est appliquée du dessus sur les petites pièces ou le produit en vrac et qui est de nouveau enlevée au plus tard avant la cuisson, au moins les parties de l'électrode qui doivent être immergées dans le bain de laque étant pourvues d'un revêtement électriquement isolant, à l'exception des surfaces nécessaires pour la mise en contact avec les petites pièces ou avec le produit en vrac, les surfaces de contact entre les petites pièces ou le produit en vrac, le support et l'électrode, ainsi que des surfaces éventuelles de contact entre les petites pièces ou à l'intérieur du produit en vrac étant au moins modifiées une fois dans le bain de trempage électrophorétique.
- Procédé selon la revendication 1 ou 2, caractérisé par une utilisation d'une bande transporteuse selon la revendication 1 ou d'une électrode selon la revendication 2 dont le revêtement électriquement isolant se compose d'un laquage à l'aide de la laque, employée pour le trempage électrophorétique, cuite.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le trempage s'effectue par cataphorèse.
- Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que les petites pièces ou le produit en vrac à laquer sont mouillées par pulvérisation ou dans une cuve, avant l'immersion dans le bain de trempage électrophorétique, à l'aide de la laque venant du bain de trempage, sans application d'une tension électrique.
- Procédé selon l'une quelconque revendications précédentes, caractérisé en ce que les petites pièces ou le produit en vrac parcourent directement une première étape de rinçage avec la bande transporteuse ou le support après la sortie du bain de trempage électrophorétique.
- Procédé selon l'une quelconque des revendications 2 à 6, caractérisé en ce qu'une bande transporteuse est utilisée comme support.
- Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la bande transporteuse est déplacée à une vitesse constante.
- Procédé selon la revendication 7 ou 8, caractérisé en ce qu'il est possible de faire varier les angles d'immersion et de sortie de la bande transporteuse dans le bain de trempage électrophorétique.
- Procédé selon l'une quelconque des revendications 7 à 9, caractérisé en ce que l'angle d'immersion et de sortie de la bande transporteuse dans le bain de trempage électrophorétique est au maximum de 15 degrés.
- Procédé selon l'une quelconque revendications 7 à 10, caractérisé en ce que la direction de transport de la bande transporteuse est modifiée dans le bain de trempage électrophorétique afin de modifier les surfaces de contact, en particulier en guidant la bande transporteuse sur des chicanes stationnaires ou mobiles, en déplaçant l'une par rapport à l'autre des parties d'une bande transporteuse qui est divisée par exemple en et/ou en inversant le sens de mouvement des parties d'une telle bande, ou en communiquant des vibrations du type chocs à la bande transporteuse.
- Procédé selon la revendication 1 et selon l'une quelconque revendication 7 à 11, caractérisé en ce que la bande transporteuse, pour être nettoyée après l'enlèvement des petites pièces ou du produit en vrac, est guidée à travers une cuve en étant soumise à une eau de rinçage provenant d'une installation de rinçage montée en aval du bain de trempage électrophorétique, est rincée à l'eau en étant brossée par une ou plusieurs brosses fixes ou tournantes, ou est guidée à travers un tunnel saturé en vapeur de solvants.
- Procédé selon la revendication 1, caractérisé en ce que la bande transporteuse est mise à la masse.
- Procédé selon l'une revendications 7 à 13, caractérisé en ce que la bande transporteuse comporte une surface électriquement non conductrice et qu'une électrode flexible est appliquée dans le bain de trempage électrophorétique sur les petites pièces ou le produit en vrac.
- Procédé selon l'une quelconque des revendications 2 à 6, caractérisé en ce que l'on utilise un support qui est réalisé sous la forme de claies superposées entre elles, et en ce que ces claies sont déplacées au moins une fois dans le bain de trempage électrophorétique à l'aide de vibrations du type chocs.
- Procédé selon la revendication 15, caractérisé en ce que les claies présentent des surfaces électriquement isolantes et non mouillables par la laque, qui sont thermiquement stables à la température nécessaire pour la cuisson et en ce que la mise en contact des petites pièces ou du produit en vrac s'effectue dans le bain de trempage électrophorétique à l'aide d'une ou plusieurs électrodes qui sont appliquées du dessus et qui sont enlevées de nouveau au plus tard avant l'entrée dans le four de cuisson.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les petites pièces ou le produit en vrac à laquer sont disposés sous forme d'une couche à strate unique sur le support lors du laquage par trempage électrophorétique et/ou du rinçage.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les petites pièces ou le produit en vrac sont transférés, lorsqu'ils quittent le bain de trempage électrophorétique, sur une autre bande transporteuse, ou sur d'autres claies, sur lesquelles s'effectuent le rinçage dans le dispositif de rinçage et la cuisson de la laque dans un four de cuisson.
- Procédé selon la revendication 18, caractérisé en ce que les petites pièces ou le produit en vrac sont disposés sous l'eau, en particulier dans l'eau d'un dispositif de rinçage monté en aval, sur l'autre bande transporteuse ou les autres claies en dessous de l'eau.
- Procédé selon la revendication 18 ou 19, caractérisé en ce que les petites pièces sont disposées sur l'autre bande transporteuse ou sur une autre claie sous forme d'une couche à strate unique.
- Procédé selon l'une des revendications 18 à 20, caractérisé en ce que l'on emploie une autre bande transporteuse ou d'autres claies dont la surface n'est pas mouillée par la laque dans le four de cuisson.
- Procédé selon l'une des revendications 18 à 21, caractérisé en ce que la position des petites pièces ou du produit en vrac, sur l'autre bande transporteuse ou les autres claies, est modifiée au moins une fois dans le four de cuisson.
- Installation de laquage par trempage électrophorétique de petites pièces et de produit en vrac, adapté à la mise en oeuvre du procédé selon l'une quelconque des revendications 1, 3 à 13 et 17 à 22, comprenant un récipient de bain (1) pour le trempage électrophorétique, un dispositif de rinçage (2) et un four de cuisson (3), caractérisée en ce qu'une bande transporteuse (4) incluant un dispositif (5) d'amenée des petites pièces ou du produit en vrac à laquer est disposée en dehors du récipient (1) d'une manière telle qu'il est introduit dans le récipient (1) et est à nouveau sorti de celui-ci selon un angle variable, la bande transporteuse se composant d'une matière à haute conductibilité électrique et étant pourvue d'un revêtement électriquement isolant, en particulier à l'ide de la laque utilisée pour le laquage dans le bain d'électrophorèse et cuite, à l'exception des surfaces extérieures de bande nécessaires pour le contact électrique et pour la mise en contact des petites pièces ou du produit en vrac à laquer, et en ce que des dispositifs sont prévus dans le récipient (1) pour modifier la direction de transport de la bande transporteuse, pour déplacer des parties de la bande transporteuse l'une par rapport à l'autre et/ou pour inverser le sens de mouvement de ces parties, pour déplacer les petites pièces ou le produit en vrac sur la bande transporteuse ou pour communiquer des vibrations du type chocs à la bande transporteuse.
- Installation selon la revendication 23, caractérisée en ce que les dispositifs de modification de la direction de transport de parties de la bande transporteuse, de déplacement ou de changement de sens du mouvement de ces parties sont des chicanes stationnaires ou mobiles et/ou des dispositifs de déplacement ou de changement de sens du mouvement de parties d'une bande transporteuse divisée.
- Installation selon la revendication 23 ou 24 caractérisée en ce que la bande transporteuse (4) est une bande sans fin et en ce que des dispositifs sont prévus pour ramener la bande transporteuse sans fin qui sort du bain (1) en passant par un dispositif de rinçage pour les petites pièces laquées ou pour le produit en vrac laqués (10), et des dispositifs de nettoyage de la bande transporteuse sous forme d'un dispositif de rinçage (35) et d'une brosse de rinçage (16) pour la surface extérieure de bande.
- Installation selon la revendication 23, 24 ou 25, caractérisée en ce que la bande transporteuse est pourvue d'un guidage latéral et/ou de dispositifs d'entraînement.
- Installation selon l'une des revendications 23 à 26, caractérisée en ce que le récipient de bain (1) contient une ou plusieurs contre-électrodes (18) encapsulées dans des poches d'électrodialyse, qui sont disposées de préférence dans un plan parallèle à la bande transporteuse (4).
- Installation selon la revendication 27, caractérisée en ce qu'elle contient un dispositif de déplacement de la position des contre-électrodes (18).
- Installation selon l'une des revendications 23 à 28, caractérisée en ce que la bande transporteuse (4) est pourvue de chaînes d'entraînement sur l'un de ses côtés ou sur ses deux côtés.
- Installation selon l'une des revendications 23 à 29, caractérisée en ce que la bande transporteuse (4) est déplacée par des rouleaux d'entraînement (29) et (30), en étant exempte de contraintes de glissement et de traction, en utilisant un circuit synchrone.
- Installation selon l'une des revendications 23 à 30, caractérisée en ce qu'une autre bande transporteuse (12) de réception des petites pièces ou du produit en vrac venant de la bande transporteuse (4) se raccorde à la bande transporteuse (4) qui sort du récipient (1), l'autre bande transporteuse (12) parcourant un dispositif de rinçage (2), et une autre bande transporteuse (13) qui traverse un four de cuisson (3) étant raccordée à cette bande transporteuse (12) pour recevoir les petites pièces ou le produit en vrac, la bande transporteuse (13) se composant d'une matière, ou étant revêtue d'une matière, qui n'est pas mouillée par la laque à cuire et qui est thermiquement stable aux températures nécessaires pour la cuisson.
- Installation selon la revendication 31, caractérisée en ce qu'elle comprend, dans le four de cuisson (3), des dispositifs de modification de la position des petites pièces ou du produit en vrac sur la bande transporteuse (13) qui le parcourt et/ou que la bande transporteuse (13) est réalisée d'une manière telle que seules de petites surfaces de contact sont possibles avec les petites pièces ou avec le produit en vrac.
- Installation selon l'une des revendications 23 à 32, caractérisée en ce que la bande transporteuse (4) qui traverse le récipient (1) de trempage électrophorétique est réalisée en acier inoxydable sous forme de bande en fil spiral, le profil des spirales étant rond ou triangulaire.
- Installation selon l'une des revendications 23 à 33, caractérisée en ce qu'une glissière (17) à laquelle peut être appliqué un film d'eau est installée entre la bande transporteuse (4) qui sort du bain (1) de trempage électrophorétique et la bande transporteuse (12) du dispositif de rinçage.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3843544A DE3843544A1 (de) | 1988-12-23 | 1988-12-23 | Verfahren und vorrichtung zur elektrophoretischen tauchlackierung von kleinteilen und schuettguetern |
DE3843544 | 1988-12-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0376222A1 EP0376222A1 (fr) | 1990-07-04 |
EP0376222B1 true EP0376222B1 (fr) | 1995-03-15 |
Family
ID=6370050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89123856A Expired - Lifetime EP0376222B1 (fr) | 1988-12-23 | 1989-12-23 | Procédé et appareillage pour le dépôt par électrophorèse d'une laque sur de petits objets en vrac |
Country Status (8)
Country | Link |
---|---|
US (1) | US5810987A (fr) |
EP (1) | EP0376222B1 (fr) |
AT (1) | ATE119951T1 (fr) |
BR (1) | BR8906701A (fr) |
CA (1) | CA2006735C (fr) |
DE (2) | DE3843544A1 (fr) |
ES (1) | ES2072287T3 (fr) |
MX (1) | MX170446B (fr) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4142997C1 (fr) * | 1991-12-24 | 1993-01-28 | Nuetro Maschinen- Und Anlagenbau Gmbh & Co. Kg, 8500 Nuernberg, De | |
IT1262316B (it) * | 1993-04-30 | 1996-06-19 | Gianfranco Baldassari | Macchina ad elevata flessibilita' di impiego per la riverniciatura elettroforetica di coperchi in banda stagnata. |
DE4339773C2 (de) * | 1993-11-23 | 2001-12-13 | Nuetro Maschinen & Anlagen | Verfahren und Vorrichtung zum Tauchlackieren |
DE4341188C2 (de) * | 1993-12-03 | 1998-07-09 | Nuetro Maschinen & Anlagen | Vorrichtung und Verfahren zum Elektrotauchlackieren |
DE19511900C2 (de) * | 1995-03-31 | 1997-04-24 | Hentschel Michael Dipl Ing Fh | Vorrichtung zum Elektro-Tauchlackieren |
IT1291435B1 (it) * | 1997-03-18 | 1999-01-11 | Cvg Centro Veneto Galvanico | Dispositivo di trasferimento di pezzi per un impianto di trattamento superficiale |
US6436260B1 (en) * | 2000-11-17 | 2002-08-20 | E. I. Du Pont De Nemours And Company | Process for electrocoating bulk articles |
US20030052009A1 (en) * | 2001-09-14 | 2003-03-20 | Case Leo L. | Method and apparatus for the bulk coating of components |
US20030132115A1 (en) * | 2002-01-15 | 2003-07-17 | Andreae Bradley M. | Method of electrocoating of small parts with various paints |
DE10250471B3 (de) * | 2002-10-30 | 2004-04-01 | Lindal Ventil Gmbh | Anlage zur Antikorrosionsbehandlung von Ventiltellern für Spenderbehälter |
DE20220161U1 (de) | 2002-10-30 | 2003-03-27 | Lindal Ventil GmbH, 23843 Bad Oldesloe | Ventilteller und Anlage zur Antikorrisionsbehandlung von Ventiltellern für Spenderbehälter |
US7632386B2 (en) * | 2003-08-28 | 2009-12-15 | E.I. Du Pont De Nemours And Company | Process for producing coatings on electrically conductive substrates by cathodic electrodeposition coating |
EP1768717A2 (fr) * | 2004-07-19 | 2007-04-04 | Elutex Ltd. | Surfaces a conduction modifiee presentant des subtances actives fixees a celles-ci et utilisations associees |
US7947160B2 (en) * | 2004-08-13 | 2011-05-24 | Ppg Industries Ohio, Inc. | System for coating objects |
US7943028B2 (en) * | 2004-08-13 | 2011-05-17 | Ppg Industries Ohio, Inc. | Method for coating objects |
US20060051511A1 (en) * | 2004-08-13 | 2006-03-09 | Orosz Gary R | Apparatus and systems for coating objects |
DE102005032587A1 (de) * | 2005-07-11 | 2007-01-25 | Tecnobless Gmbh | Kontaktentlackung von Lackierträgersystemen |
TW200738532A (en) * | 2006-04-10 | 2007-10-16 | Chicony Electronic Co Ltd | Material delivery system capable of preventing dust suspension |
CN102747410B (zh) * | 2012-07-25 | 2014-10-29 | 张军 | 开放链带式滚镀机 |
CN103710740A (zh) * | 2013-12-30 | 2014-04-09 | 河南星光机械制造有限公司 | 新型自动滚镀装置 |
DE102014006795B4 (de) * | 2014-05-09 | 2018-02-15 | Eisenmann Se | Anlage und Verfahren zum Beschichten von Gegenständen |
CN105537069B (zh) * | 2016-03-09 | 2017-11-17 | 江苏韩森自动车股份有限公司 | 一种汽车气门防锈的自动化处理设备 |
DE102016206417A1 (de) * | 2016-04-15 | 2017-10-19 | Henkel Ag & Co. Kgaa | Fördergestellbehandlung zur unterdrückung anlagenbedingter phosphatüberschleppung in einer prozessfolge zur tauchlackierung |
US11551993B2 (en) | 2020-08-28 | 2023-01-10 | Ge Aviation Systems Llc | Power overlay module and method of assembling |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1180731A (en) * | 1966-03-16 | 1970-02-11 | Ici Ltd | Electrodeposition Coating Process and Apparatus |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3304250A (en) * | 1965-03-17 | 1967-02-14 | Ford Motor Co | Continuous electrocoating process utilizing electrodialysis to control the bath composition |
US3728247A (en) * | 1968-12-04 | 1973-04-17 | Armco Steel Corp | Apparatus for coating conductive articles |
US3616392A (en) * | 1968-12-04 | 1971-10-26 | Armco Steel Corp | Method for coating conductive articles |
US3682136A (en) * | 1971-03-04 | 1972-08-08 | Armco Steel Corp | Conveyor for electropainting |
US3830716A (en) * | 1971-07-22 | 1974-08-20 | Armco Steel Corp | Electrocoating method and apparatus |
BE792427A (fr) * | 1971-12-27 | 1973-03-30 | Kendall & Co | Procede d'electrodeposition de pellicules de polymeres organiques |
US3923623A (en) * | 1973-04-27 | 1975-12-02 | Armco Steel Corp | Method and apparatus for use in conjunction with electropainting a large number of small articles |
US3879277A (en) * | 1973-04-27 | 1975-04-22 | Armco Steel Corp | Method and apparatus for electropainting small articles |
US3898151A (en) * | 1973-06-18 | 1975-08-05 | Diamond Shamrock Corp | Apparatus for electrocoating conductive articles including magnet means to convey the articles |
US3945901A (en) * | 1973-06-18 | 1976-03-23 | Diamond Shamrock Corporation | Method for electrocoating conductive articles |
US4196023A (en) * | 1974-03-25 | 1980-04-01 | Carrier Drysys Limited | Treating automobile bodies |
GB1477060A (en) * | 1974-06-05 | 1977-06-22 | Mitsubishi Electric Corp | Process for preparing insulation coated wire by electrode position |
US4817650A (en) * | 1988-01-04 | 1989-04-04 | Herbert Tilton | Self-contained tiltable basket for plating, washing or otherwise treating hollow articles |
-
1988
- 1988-12-23 DE DE3843544A patent/DE3843544A1/de active Granted
-
1989
- 1989-12-22 MX MX018893A patent/MX170446B/es unknown
- 1989-12-22 BR BR898906701A patent/BR8906701A/pt not_active IP Right Cessation
- 1989-12-23 AT AT89123856T patent/ATE119951T1/de not_active IP Right Cessation
- 1989-12-23 DE DE58909113T patent/DE58909113D1/de not_active Expired - Fee Related
- 1989-12-23 ES ES89123856T patent/ES2072287T3/es not_active Expired - Lifetime
- 1989-12-23 EP EP89123856A patent/EP0376222B1/fr not_active Expired - Lifetime
- 1989-12-27 CA CA002006735A patent/CA2006735C/fr not_active Expired - Fee Related
-
1996
- 1996-12-27 US US08/777,279 patent/US5810987A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1180731A (en) * | 1966-03-16 | 1970-02-11 | Ici Ltd | Electrodeposition Coating Process and Apparatus |
Also Published As
Publication number | Publication date |
---|---|
ES2072287T3 (es) | 1995-07-16 |
CA2006735C (fr) | 2000-12-26 |
DE3843544A1 (de) | 1990-06-28 |
US5810987A (en) | 1998-09-22 |
BR8906701A (pt) | 1990-09-11 |
CA2006735A1 (fr) | 1990-06-23 |
MX170446B (es) | 1993-08-23 |
DE58909113D1 (de) | 1995-04-20 |
DE3843544C2 (fr) | 1991-02-21 |
ATE119951T1 (de) | 1995-04-15 |
EP0376222A1 (fr) | 1990-07-04 |
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