EP0118756B1 - Procédé de revêtement de boîtes - Google Patents

Procédé de revêtement de boîtes Download PDF

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Publication number
EP0118756B1
EP0118756B1 EP84101257A EP84101257A EP0118756B1 EP 0118756 B1 EP0118756 B1 EP 0118756B1 EP 84101257 A EP84101257 A EP 84101257A EP 84101257 A EP84101257 A EP 84101257A EP 0118756 B1 EP0118756 B1 EP 0118756B1
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EP
European Patent Office
Prior art keywords
cans
process according
bath
immersion bath
coated
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
Application number
EP84101257A
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German (de)
English (en)
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EP0118756B2 (fr
EP0118756A1 (fr
Inventor
Wolfgang Bogdan
Hans-Peter Dr. Patzschke
Hans-Jürgen Schlinsog
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.)
Axalta Coating Systems Germany GmbH and Co KG
Original Assignee
Herberts GmbH
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Application filed by Herberts GmbH filed Critical Herberts GmbH
Priority to AT84101257T priority Critical patent/ATE27311T1/de
Publication of EP0118756A1 publication Critical patent/EP0118756A1/fr
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Publication of EP0118756B2 publication Critical patent/EP0118756B2/fr
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    • 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
    • C25D13/14—Tubes; Rings; Hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/09—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles
    • B05C3/10—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles the articles being moved through the liquid or other fluent material

Definitions

  • the invention relates to a method for coating cans which are open on one side, such as a metallic cans provided with a bottom, with lacquer, in which the individual cans are washed and coated on the outside and inside and dried and then, if appropriate, printed and dried again and also flanged at the open end.
  • electrocoating for which the can manufacturer industry can be introduced as a fully automatic painting process.
  • EC electrocoating
  • the can bodies are easy to handle because they do not yet have a bottom and the bath liquid for coating can enter easily and can also run out again after coating.
  • US Pat. No. 3,253,943 describes a device for coating bottles which is held at the bottle neck and introduced into and removed from a coating bath on a pitch circle, so that the bath liquid is emptied downwards after being removed. The coated bottles are then fed into a drying oven on an endless conveyor belt.
  • US Pat. No. 3,391,073 describes an anodizing device in which cups attached to an endless belt pass through an anodizing bath on a partial circular path. Cans which are open on one side, such as cans provided with a bottom, cannot simply be coated electrophoretically, because it is necessary for a uniform coating that the air in the hollow body escapes completely. Therefore, the mechanical engineering industry has developed special methods that are carried out step by step, i.e.
  • the cans for the interior painting are kept on the floor and at the same time the necessary electrical contacts are made.
  • a counterelectrode is built into the open end of the can, which must have a small distance of 0.25 to 5 mm from the inner wall of the can. Therefore, the shape of the electrode must be adapted very precisely to that of the box. Because of the complicated structure of the corresponding system, the cans must be coated individually one after the other, so that only short coating times of 10 to 500 msec are available if one wants to achieve a high can throughput.
  • liquid In the case of a closed system, for example in a vertical arrangement (EP 50 045, EP 19 669, GB-PS 1 117 831, US-PS 3 922 213 and DE-OS 29 29 570), liquid must be pumped at high speeds in order to alternate EC liquid and to be able to carry out a water rinse in a short period of time and to discharge the gases produced during the EC coating (depending on the polarity, oxygen or hydrogen).
  • the approximately horizontally arranged cans In the open system, the approximately horizontally arranged cans must be rotated in order to achieve a uniform coating (DE-PS 26 33 179 and US-PS 4 107 016). When blowing out the cans, there is a great risk of contamination.
  • the object of the invention is to simplify the electrophoretic coating of cans which are open on one side, such as metal cans provided with a base, in such a way that coating can be carried out both externally and internally in one continuous operation.
  • each can is passed through an electrophoretic immersion bath for a time of 1 to 120 seconds and is thereby coated with a wet film which deposits on its surfaces, which has an electrical sheet resistance of at least 0.6 x 10 8 ohm x cm, being immersed in a continuous operation with its opening pointing obliquely downwards into the immersion bath, being immersed in the bath in such a way that its opening faces upwards, and then with is lifted out of the bath with its opening pointing downwards and is then passed through an endless transport means through one or more drying ovens.
  • the invention makes it possible to coat cans which are open on one side, such as metal cans provided with a bottom, in one operation at the same time on the outside and on the inside and then to dry immediately and, if appropriate, to print or label them.
  • the mechanical effort and space requirements are relatively low, so that an economical mode of operation is possible.
  • 16 cans can be passed through an electro-dip bath at the same time, ie side by side, and coated with lacquer.
  • the cans When passing through the dip bar, the cans are tilted by the transport elements holding them by at least 90 °, so that they first dip into the bath with a longitudinal axis inclined up to 45 ° to the bath surface, in which they are tilted so that their longitudinal axis is now in the opposite direction runs obliquely so that the opening now points upwards.
  • To dig the Cans from the submersible are tilted again so that the opening is at the bottom so that the liquid in the cans can drain off completely. The tipping can take place in the bathroom while it is being lifted out of the bathroom or shortly afterwards.
  • the transport element can be an endless forming belt or an endless chain on which the cans are rotatably suspended and which is guided through the EC immersion bath. Wheels or rollers are also suitable as transport elements which continuously lead the cans to be coated through an aqueous immersion bath.
  • the cans for coating are passed through an immersion bath and it is also possible to pass several cans next to one another simultaneously through the immersion bath, sufficiently long coating times can be achieved even with mass production with high throughput in order to be able to apply flawless paint coatings.
  • a coating time of 1 to 120 seconds a pigmented or unpigmented lacquer is applied electroproretically by means of direct current, the wet film deposited on the cans having a sheet resistance of at least 0.6 x 10 8 ohm x cm.
  • the cans to be coated are switched via the holding device when using an anionic EC lacquer as an anode and when using a cationic EC lacquer as a cathode.
  • the counter electrode is located at the necessary distance from the cans in the immersion bath and / or in the can.
  • the inner or outer coating is carried out with the help of the so-called throwing power, which the lacquer achieves in the deposited wet film without or with the aid of an auxiliary electrode because of its insulating effect which is as high as possible. Before the inner coating starts, all air in the cans must escape from the interior.
  • the electrophoretic coating runs so that the wall opposite the counter electrode, e.g. the outer wall of the can is coated.
  • the wet wall that builds up first isolates the outer wall.
  • the electric field lines then migrate into the interior of the can, where the deposition continues.
  • the deposition time and the insulating effect of the material characterized by the sheet resistance and easy coagulation, must be coordinated to achieve a good grip.
  • the limit of the coating time should be over 3 seconds, in particular over 5 seconds and particularly over 10 seconds. The upper limit is determined by the length of the immersion bath, the transport speed and the length of the cans to be coated that must be retained.
  • the upper limit should expediently be less than 60 seconds and preferably less than 30 seconds of coating time.
  • the amount of film applied depends on the deposition voltage, which is between 50 and 400 volts, preferably between 100 and 300 volts. With increasing tension, the wrap is improved. In order to avoid electrical breakdowns, the voltage is either continuously increased or gradually with a low or several increasing bias voltages. For example, before the actual coating, voltages of less than 100 volts are used for 0.1 to 0.5 seconds.
  • the wet film resistance required for good insulation should be as high as possible.
  • its lower limit is limited by the desired short coating time.
  • the lower limit should be at least 0.8 x 10 8 ohm x cm, expediently above 10 x 10 8 and preferably above 2 x 10 8 ohm x cm.
  • the upper limit is therefore below 10 x 10 ohm x cm, suitably below 7 x 10 ohm x cm and preferably below 4 x 10 8 ohm h cm.
  • the bath conductivity which is determined by the degree of neutralization of the binder, is above 6001J, Scm-1, suitably above 800 / gScml and preferably above 1200gScm- 1 lies.
  • anionic and cationic resins can be used as binders, the anionic for acidic and the cationic for basic fillers being preferred.
  • the anionic resins such as maleinized or acrylated butadienols, maleinized natural oils, carboxyl group-containing epoxy resin esters and acrylic resins, acrylic epoxy resins unmodified or modified with fatty acids, have an acid number of 30 to 180, in particular between 40 and 80, and are at least partially neutralized with ammonia, amines or amino alcohols. Highly volatile amines are preferred so that they are removed as completely as possible from the film with the desired short stoving times of 10 seconds to 300 seconds. Ammonia is particularly preferred.
  • crosslinking takes place either oxidatively via unsaturated double bonds or by thermal reaction with corresponding crosslinking agents such as phenolic resins, amine-formaldehyde resins or blocked polyisocyanates.
  • corresponding crosslinking agents such as phenolic resins, amine-formaldehyde resins or blocked polyisocyanates.
  • External or self-crosslinking acrylate resins are preferred for the production of white lacquer coatings.
  • externally or self-crosslinking acrylate resins acrylated or maleinized epoxy esters or epoxy acrylates are preferred.
  • the cationic resins such as butadienol-aminoalkylimide Mannich bases of phenol resins, amino group-containing acrylate resins or amino-epoxy resins have an amine number of 30 to 120 mg KOH / g solid resin, preferably before 50 to 90 and are combined with organic monocarboxylic acids such as carbonic acid, formic acid, acetic acid, lactic acid etc. at least partially neutralized.
  • the crosslinking agents used are preferably blocked polyisocyanates or resins which contain ester groups capable of transesterification.
  • the binders are neutralized with the neutralizing agents and, if appropriate, diluted with deionized or distilled water in the presence of solvents.
  • Suitable solvents are primary, secondary and / or tertiary alcohols, ethylene or propylene glycol mono- or diether, diacetone alcohol or even small amounts of non-water-dilutable solvents such as petroleum hydrocarbon.
  • the aim is to keep the solvent content as low as possible, expediently less than 15% by weight and preferably less than 5% by weight, because with increasing solvent content the wrap worsens.
  • the bath solids are generally between 5 and 30% by weight, in particular above 8 and below 20% by weight. With increasing the solids BadleitContactkei t is increased and the deposition equivalent (ampere -sec / g) reduced, can be increased whereby the throwing power. Due to the high concentration of layer-forming ions, the layer resistance goes through a maximum.
  • the bath temperature is between 20 and 35 ° C. As the temperature drops, the wrap increases. Temperatures below 20 ° C are uneconomical because the heat generated by the EC coating has to be dissipated again by plenty of cooling water. Temperatures above 35 ° C make it difficult to run the bath because too much solvent evaporates and hydrolysis phenomena on the binder system produce fluctuations in the electrical data.
  • the coating agent can additionally contain customary technical auxiliaries such as catalysts, leveling agents, anti-foaming agents, lubricants, etc.
  • additives should be selected which do not cause any disturbing reactions with water at the pH of the bath, do not carry in any disturbing foreign ions, and do not precipitate out in a non-agitated form when they are left standing for a long time.
  • the binders can be used pigmented or unpigmented. Such materials can be used as pigments and fillers which, owing to their small particle size below 10 ⁇ m, particularly below 5 ⁇ m, can be dispersed stably in the lacquer and can be stirred up again when standing. They must not contain any interfering foreign ions and must not react chemically with water or the neutralizing agent.
  • the pigmentation can be both white and colored. White is preferred. With the additional incorporation of interference pigments, it is possible to achieve metal-effect coatings with aluminum-silver-brass-copper-gold effects, etc.
  • the pigments such as titanium dioxide, are rubbed into a concentrated millbase and then adjusted to a pigment-binder ratio of about 0.1 to 1 to 0.7 to 1 with further binder.
  • the wrap is increased by the incorporation of pigments.
  • finely powdered nonionic resins such as powdered polycarbonate resins, epoxy resins and / or blocked polyisocyanates, the amounts added being selected so that they do not exceed the maximum sheet resistance.
  • Binder, pigment content, bath solids content, solvent content, choice of neutralizing agent and the degree of neutralization are coordinated with the coating conditions such as bath temperature, deposition voltage and deposition time so that a complete coating takes place in the electrocoating bath, which after baking inside the can with layer thicknesses of at least 3 ⁇ m, preferably at least 4gm, more preferably at least 5 and not more than 10 microns in 1 particularly at most 7gn is non-porous.
  • the EC painting is done in an immersion bath.
  • the cans which are closed on one side can be guided at the can opening with the aid of a magnetic electromagnetic or mechanical holding device, which is also understood to mean the holding with a vacuum.
  • the screwing of the can into the filled electro-dip lacquer basin and the position of the can in the electrophoretic coating ensures that the resulting gases can escape upwards. Due to the transport speed and the rotatable bearing, a flow is generated in the can, which dissipates the heat generated during electrophoresis.
  • the simple construction of the hangers allows the cans to be closely spaced apart. The can is emptied again by turning the can bottom upwards. Direct current is used as the current source.
  • the socket is electrically connected via the holding device as an anode or as a cathode.
  • the counter electrode is e.g. outside the can in the electro-immersion bath. Due to the encapsulation of the paint and the deposition voltage and coating time required for the respective can shape, the can is completely coated inside and out. This process has the advantage that the entire coating or the remaining external and internal coating is carried out in a single process step and, due to the low mechanical outlay on the hanger, many cans can be coated side by side at the same time.
  • An auxiliary electrode can also be inserted into the box to provide support, especially when high throughput speeds are required.
  • the immersion electrode has a shape not determined by the can and is less than half the diameter of the can. It is preferably arranged so that it is inserted into the interior of the can at the same time as the can holder.
  • the inner electrode can be made hollow. Filtered varnish is pumped into the can through this feed line.
  • the hanger When the hanger is extended, it is rinsed together with the cans first with ultrafiltrate and then with water, to which solvents and / or emulsifiers can optionally be added to avoid wetting problems.
  • the lacquer is then baked at times of 1 to 300 seconds at temperatures of 180 to 250 ° C., preferably 120 to 180 seconds at 210 to 230 ° C.
  • the conveyor belt is closed with a hanger and box passed through the oven.
  • the can base can be predried and provided with a protective auxiliary layer. Afterwards, the transfer can take place on a conveyor belt leading through the drying oven.
  • the opening of the can can be directed downwards or preferably upwards.
  • a special case of this process is the printing of the unpainted can with one or more essentially electrically non-conductive printing inks and a subsequent EC coating, in which the non-printed parts of the can are then coated with EC varnish.
  • an improved manufacturing process is possible.
  • the printing of the bare, not flanged can can be carried out in conventional printing machines according to the state of the art. Then the printed can is flanged and subjected to the full EC coating according to the invention. Parts of the can of any size can be printed with a customary printing ink.
  • the outer surface of the can is imaged with at least one printing ink (it is also possible to print several different printing inks in succession) in offset printing and is dried to produce a print which is stable after drying in the EG bath with a sufficient specific sheet resistance, for example of more than 10 7 ohm ⁇ cm in the entire area of the printed image, so that no EC varnish is deposited here, and the printed substrate is coated with an EC varnish in a different color or transparent.
  • the specific sheet resistance should naturally be so high that the deposition of the EC varnish is avoided. It is therefore preferably higher than 10 8 ohm x cm and particularly preferably more than 10 10 ohm x cm in the entire area of the printed image.
  • Continuous coating in the EC tank enriches the amine in the anionic binder and the carboxylic acid in the case of a cationic binder.
  • the refill materials are either neutralized correspondingly lower or the excess neutralizing agents are removed by electrodialysis.
  • the rinse water is enriched by ultrafiltration and returned to the paint basin, which increases the degree of utilization of the paint and removes unwanted foreign ions.
  • cans 2 which are open on one side are brought in through a chute 1 in such a way that their inwardly curved bottom 3 lies on the outside.
  • the chute 1 ends above a bath tank 4, which is filled up to a mirror 5 with an electrocoating liquid.
  • the chute i ends above the liquid level 5.
  • a star wheel 7 is rotatably mounted about a horizontal axis 6 above the bath tank 4 in the direction of an arrow 8, which is not shown in detail in FIG. 1.
  • On the outer circumference of this star wheel 7 there are mechanical holders 9 which mechanically grasp the sockets 2 at their open ends 10 and at the same time form the necessary electrical contacts.
  • the counter electrode is arranged on the bath tank 4 and at a distance from the star wheel 7 below the liquid level 5.
  • star wheel 7 Although only one star wheel 7 is indicated in FIG. 1, several star wheels of this type are actually arranged next to one another and can be rotated together about the axis 6. For example, a total of 16 star wheels 7 are provided side by side, so that 16 cans 2 can be passed through the immersion bath 4 at the same time. The star wheels 7 lie next to one another at a sufficient distance so that the adjacent boxes 2 do not touch one another.
  • the cans 2, as shown in FIG. 1, are guided by the star wheels 7 on a circular path through the immersion bath 2, with them being slightly inclined downwards, i.e. H. hit the liquid level 5 with a horizontal longitudinal axis and immerse in the bath in this position. This quickly floods the interior of the individual cans.
  • the cans immersed in the bath migrate through the same in such a way that their longitudinal axis becomes more and more vertical, so that the air inside the cans can escape through the opening which points upward more and more and the cans are accordingly quickly completely filled with liquid.
  • the immersed cans 2 are electrophoretically coated with the lacquer of the immersion bath filling as they pass through the immersion bath.
  • the cans are again inclined slightly downwards, i.e. with approximately horizontal longitudinal axis lifted out of the bath and then tilted further, so that the bath liquid in them runs out with certainty.
  • This magnetic tape 11 serves as a transfer section, and the wet film applied to the cans can be predried. It is also possible to carry out rinsing operations on the coated cans 2 in the area of the magnetic tape.
  • the cans 2 are transferred from the magnetic tape 11 to a further magnetic tape 12, on which the cans 2 are held with their open ends.
  • This magnetic tape 12 transfers the cans 2 to a conveyor belt 13 of a drying oven 14, on which the cans 2 are placed with the floor facing downwards at a mutual distance from one another in the exemplary embodiment shown.
  • the electrophoretically applied coating of the cans 2 is dry, so that the cans can now, if desired, also be labeled or printed.
  • the magnetic tape 11 can deliver the cans 2 directly to the conveyor belt 13 of the drying oven 14. It is essential that the cans 2 guided one behind the other and next to one another are always moved at a sufficient distance from one another that they cannot touch one another to rule out surface defects on the coating with certainty.
  • the system shown in Fig. 1 can be used in connection with existing drying ovens 14, i.e. the drying oven 14 and its conveyor belt 13 need not be converted or dealt with for use with the upstream system parts.
  • the system shown in the drawing can accordingly be operated with existing system parts.
  • the system shown in FIG. 2 differs from that of FIG. 1 essentially in that the cans 2 to be coated are held at their bottom during transport through the immersion bath 4 and in that only one is transferred to the conveyor belt 13 of the drying oven 14 Conveying element is required, on which the cans 2 are held with their open end 10.
  • the cans 2 are fed through a chute 1 and transferred above the liquid level 5 of the immersion bath 4 to a magnetic wheel 15, on which they are transferred with their base 3, which has a suitable, sufficiently large mass.
  • the cans 2 are transferred from the outside to the inside of the magnetic wheel 15, as indicated in FIG. 2a.
  • the magnetic wheel 15 is rotated in the direction of an arrow 16, so that the bosses 2, as in the exemplary embodiment according to FIG. 1, pass through the immersion bath 4 and are flooded with bath liquid, then coated electrophoretically and finally emptied of the bath liquid after being lifted out of the bath will.
  • the lugs 2 are brought back onto the outside of the same and transferred to a magnetic conveyor 17, to the endless transport element of which they adhere with their open end 10.
  • the magnetic conveyor 17, which can also be another transport element, such as an endless chain conveyor, on which the cans 2 are then held mechanically, conveys the cans 2 up to the conveyor belt 13 of the drying oven 14, from which the cans are placed with their bottoms down settles, so that the cans are passed through the drying oven 14 at a mutual distance from one another.
  • another transport element such as an endless chain conveyor
  • each cans 2 can be passed through the immersion bath 4 at the same time, for example 16 boses. It is again essential that the cans are sufficiently spaced from one another in the immersion bath 4 so that neither successive nor adjacent cans touch one another, which could lead to surface defects.
  • An anionic, self-crosslinking acrylate resin according to DE-B-16 69 107 was neutralized with ammonia and diluted to a solids content of 15% by weight with deionized water.
  • a flared can (diameter 65 mm, length 116 mm) was held at the flanged edge with an electrically conductive clamp and carefully immersed completely in a conductive container insulated against earth and filled with diluted lacquer with a diameter of 19 cm.
  • the box was connected to the anode, the outer vessel and the auxiliary electrode as a cathode to a direct current source.
  • the auxiliary electrode inside the can had an immersion depth of 8 cm and an electrode diameter of 2 cm. After rinsing with water, the mixture was baked in a forced air oven at 215 ° C. for 3 minutes. The inside and outside of the can was completely covered with a thin clear varnish that was pore-tight.
  • the binder from Example 1 was pigmented with 0.4 part by weight of titanium dioxide to 1 part by weight of binder and, after neutralization with ammonia, diluted to a solids content of 9% by weight.
  • the coating was carried out without the use of an auxiliary electrode.
  • the can was completely covered with a white varnish.
  • the porosity, measured in an electrolyte solution at 4 volts, is 5 mA after 30 seconds.
  • a cationic amino epoxy resin according to DE-B-31 22 641 was pigmented with 0.4 part by weight of a mixture of 99 parts by weight of titanium dioxide and 1 part by weight of carbon black and after neutralization with formic acid to a solids content of 15% by weight. diluted with deionized water. The coating was carried out without an auxiliary electrode. The can was completely covered with a gray varnish.
  • a deep-drawn metal can is washed, dried and printed in an all-round printing machine according to the dry offset process with an electrically essentially non-conductive red printing ink of the usual composition with a decor imagewise under the usual prestressing to produce a pore-free, uniform ink layer.
  • the printed image has a specific sheet resistance of approximately 2 ⁇ 10 8 ohm ⁇ um.
  • the can printed in this way is dried in a conventional manner for 70 seconds at 180 ° C. in a continuous oven, then drawn in, crimped and, as described in Example 1, coated with a white pigmented BC lacquer which contains a carboxyl group-containing, self-crosslinking polyacrylate resin mixture .
  • the total solids content of the bath is 15% by weight, the pigment: binder ratio 0.5: 1, the MEQ value 49, the pH value 8.8.
  • the pH is adjusted with ammonia.
  • the bath conductivity is 170 ° ⁇ Scm -1 .
  • the box is connected as an anode and the EG basin, which is insulated against earth, as a cathode. Separation voltage: 110 volts.
  • Deposition time 15 seconds. After coating, the can is rinsed with deionized water and dried on a wire rack with the opening facing upwards in a drying oven at 210 ° C. for 90 seconds.
  • the deposition conditions, in particular voltage and time, were chosen so that a good grip was achieved using an electrode which protruded into the can.
  • the coating with the EC varnish was done on the outside of the can on the non-printed metal surfaces and also inside the can.
  • the layer thickness of white lacquer achieved is approximately 10 to 12 ⁇ m.
  • a clean and delimited, but not overlapping, coating is achieved in the EC bath.
  • soldered or welded boxes can also be used, the solder or weld seams or places in the EG bath being coated properly.
  • the image-wise printing with decors can be done over the whole area as a raster print or as a line pattern.
  • Example 4 The procedure is as in Example 4, but the EC coating takes place in a conductive EC cup connected as a cathode without the use of an auxiliary electrode.
  • Example 4 Carried out essentially as in Example 4 or 5.
  • the can is printed with four colors in a conventional four-color printing machine.
  • the EC coating is carried out on the areas not yet printed with a clear lacquer which contains an externally cross-linking sdryzdat-melamine carcass system as a binding agent. Separation conditions: 15 ° volts, 15 seconds, 25 ° G. Layer thickness of the EG coating after baking: 7 to 8 ⁇ m. The coating was only done with an inner electrode in an insulated EG basin.
  • the term "slightly" in connection with the definition of the inclination of the cans upon entry and exit from the immersion bath means that the angle of the longitudinal axis to the liquid level is above 1 °, particularly preferably above 3 °, and preferably less than 20 °, particularly preferably less than 15 °.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Printing Methods (AREA)
  • Road Signs Or Road Markings (AREA)
  • Glass Compositions (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Chemically Coating (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Paints Or Removers (AREA)

Claims (13)

1. Procédé pour revêtir par électrophorèse des boîtes métalliques ouvertes d'un côté, avec séchage à la suite, caractérisé en ce que chaque boîte est guidée, pendant une durée de 1 à 120 secondes, dans un bain d'immersion pour électrophorèse et y est revêtue d'un film humide qui se dépose à sa surface et qui présente une résistance électrique de couche d'au moins 0.6 x 108 Ohm x cm, étant précisé que la boîte plonge dans le bain d'immersion en un processus continu de travail, avec son ouverture dirigée obliquement vers le bas, et que, immergée dans le bain, elle se déplace de façon que son ouverture se dirige vers le haut, puis qu'ensuite elle est soulevée hors du bain avec son ouverture dirigée vers le bas puis qu'elle est guidée, par un moyen de transport sans fin, à travers un ou plusieurs fours de séchage.
2. Procédé selon la revendication 1, caractérisé en ce que les boîtes sont guidées à travers le bain d'immersion sur le trajet d'un cercle partiel.
3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que plusieurs boîtes sont revêtues et séchées simultanément l'une à côté de l'autre et à une certaine distance réciproque l'une de l'autre.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que, pendant le revêtement, les boîtes sont supportées par leur extrémité ouverte contre un élément de transport qui les guide à travers le bain d'immersion.
5. Procédé selon la revendication 4, caractérisé en ce qu'un support, prévu sur un élément de transport pour les différentes boîtes, fait partie d'un circuit électrique pour servir d'électrode pour le revêtement par électrophorèse, tandis que la contre-électrode se trouve dans le bain d'immersion, à une certaine distance du trajet de transport des boîtes.
6. Procédé selon une ou plusieurs des revendications 1 à 5, caractérisé en ce qu'un support, prévu sur un élément de transport pour les différentes boîtes, fait partie d'un circuit électrique pour servir d'électrode pour le revêtement par électrophorèse, tandis que c'est la paroi du bassin qui est mise en circuit pour servir de contre-électrode.
7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'un support, prévu sur un élément de transport pour les différentes boîtes, fait partie d'un circuit électrique pour servir d'électrode pour le revêtement par électrophorése, tandis que l'on emploie des contre-électrodes qui peuvent pénétrer dans les différents boîtes et qui se trouvent à une distance de la paroi intérieure des boites qui est supérieure au demi- rayon des boîtes.
8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que l'on sertit d'abord les boîtes à leur extrémité ouverte, puis on les lave, puis on les revêt et enfin on les sèche et éventuellement on les étiquette ou on les imprime.
9. Procédé selon la revendication 8, caractérisé en ce qu après le revêtement et avant le sechage on rince les boîtes à t'eau.
10. Procédé selon une ou plusieurs des revendications 1 à 9, caractérisé en ce qu'après avoir soulevé les boîtes hors du bain, on les place, à une certaine distance réciproque l'une de l'autre, sur un moyen de transport sans fin qui les guide à travers un ou plusieurs fours de séchage.
11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce qu'après les avoir lavées, on laque d'abord les boîtes à l'extérieur sur la partie cylindrique, puis on les sèche et ensuite on revêt leur fond et leur face intérieure dans le bain d'immersion pour électrophorèse.
12. Procédé selon la revendication 11, caractérisé en ce que l'on imprime les boîtes sur la partie cylindrique extérieure avec une ou plusieurs couleurs d'impression essentiellement non électriquement conductrices, puis qu'on les revêt dans le bain d'immersion pour électrophorèse.
13. Procédé selon la revendication 12, caractérisé en ce que l'on imprime 5 à 95 % de la partie cylindrique extérieure de la boîte, pour donner une image, avec au moins une couleur d'impression, en impression offset ou en sérigraphie et qu'on les sèche en obtenant ainsi une impression qui, après le séchage, est stable dans le bain d'immersion pour électrophorése et qui présente une résistance spécifique de couche de plus de 107 Ohm x cm dans toute la zone de l'image imprimée, après quoi on effectue le revêtement, dans le bain d'immersion pour électrophorèse, dans une autre couleur ou sous forme transparente.
EP84101257A 1983-02-12 1984-02-08 Procédé de revêtement de boîtes Expired - Lifetime EP0118756B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84101257T ATE27311T1 (de) 1983-02-12 1984-02-08 Verfahren zum beschichten einseitig offener dosen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833304940 DE3304940A1 (de) 1983-02-12 1983-02-12 Verfahren zum beschichten einseitig offener hohlkoerper
DE3304940 1983-02-12

Publications (3)

Publication Number Publication Date
EP0118756A1 EP0118756A1 (fr) 1984-09-19
EP0118756B1 true EP0118756B1 (fr) 1987-05-20
EP0118756B2 EP0118756B2 (fr) 1992-09-02

Family

ID=6190745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84101257A Expired - Lifetime EP0118756B2 (fr) 1983-02-12 1984-02-08 Procédé de revêtement de boîtes

Country Status (7)

Country Link
US (1) US4659445A (fr)
EP (1) EP0118756B2 (fr)
JP (1) JPS59153897A (fr)
AT (1) ATE27311T1 (fr)
DE (2) DE3304940A1 (fr)
DK (1) DK58584A (fr)
ES (1) ES529625A0 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325068A1 (de) * 1983-07-12 1985-01-24 Herberts Gmbh, 5600 Wuppertal Verfahren zum beschichten einseitig offener hohlkoerper
DE3601560A1 (de) * 1986-01-21 1987-07-23 Herberts Gmbh Waessriges, hitzehaertbares ueberzugsmittel, dessen verwendung und damit beschichtete gegenstaende
GB8811982D0 (en) * 1988-05-20 1988-06-22 Metal Box Plc Apparatus for electrolytic treatment of articles
DE4038797A1 (de) * 1990-12-05 1992-06-11 Voit Michael Gmbh Maschine zum glasieren von ton- und porzellanwaren
ES2068723T3 (es) * 1992-05-21 1995-04-16 Joergens Klaus Procedimiento para el recubrimiento de cuerpos huecos y dispositivos para la realizacion del mismo.
DE4239680C2 (de) * 1992-05-21 1994-11-24 Joergens Klaus Verfahren und Vorrichtung zum Beschichten von Hohlkörpern
WO1994010557A1 (fr) * 1992-11-05 1994-05-11 Porton Diagnostics, Inc. Procede de production de membranes
DE4304145C1 (de) * 1993-02-11 1994-04-28 Flaekt Ab Vorrichtung zur Oberflächenbehandlung von Fahrzeugkarosserien
DE4325631C2 (de) * 1993-07-30 1996-03-28 Joergens Klaus Vorrichtung zum elektrophoretischen Beschichten der Innenoberfläche von Hohlkörpern
US5858098A (en) * 1997-01-10 1999-01-12 Eagle-Picher Industries, Inc. Immersion can coating apparatus and method
FR2883576B1 (fr) * 2005-02-09 2009-05-29 Frederic Vacheron Procede de traitement de surface de pieces creuses, cuve de mise en oeuvre d'un tel procede, procede et installation de traitement de surface en continu utilisant une telle cuve
US20070190263A1 (en) * 2006-02-10 2007-08-16 Finch John G Internal coating technique for non-cylindrical components
JP2009084659A (ja) * 2007-10-02 2009-04-23 Kuroda Seisakusho:Kk 湿式表面処理方法および湿式表面処理装置
CN106423748B (zh) * 2016-10-08 2018-09-18 新河县新安盒业有限责任公司 眼镜盒内壳涂胶及晾干流水线
CN111976285B (zh) * 2020-09-21 2022-06-07 江苏新亚彩印包装有限公司 一种酒瓶立体标签印刷烘干装置及工艺

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253943A (en) * 1963-03-04 1966-05-31 Union Carbide Corp Bottle coating machine
US3391073A (en) * 1964-08-24 1968-07-02 Aluminum Coil Anodizing Corp Anodizing apparatus
DE1905270B2 (de) * 1969-02-04 1973-10-25 Alfred 5000 Koeln Krueger Verfahren zur Beschichtung von Hohlkörpern
US3694336A (en) * 1969-06-02 1972-09-26 Continental Can Co Method for can electrodeposition
US3668100A (en) * 1970-07-01 1972-06-06 Continental Can Co Electrophoretic coating of metal substrates using elevated pressures
GB1395383A (en) * 1972-08-31 1975-05-29 Carrier Drysys Ltd Treating metallic bodies
US3801485A (en) * 1972-09-01 1974-04-02 American Can Co Apparatus and method for electrodepositing a coating on interior surfaces of container bodies
GB1535077A (en) * 1975-07-21 1978-12-06 Standard T Chemical Co Inc Method and apparatus for electrophoretic coating
BR7608760A (pt) * 1976-06-07 1978-07-25 Standard Chem Co Inc Processo e aparelho para revestir eletroforeticamente um superficie de uma peca
US4158619A (en) * 1977-06-20 1979-06-19 Standard T Chemical Company, Inc. Method and apparatus for removing excess electro-phoretic material from a coated interior workpiece surface
US4094760A (en) * 1977-07-25 1978-06-13 Aluminum Company Of America Method and apparatus for differentially and simultaneously electrocoating the interior and exterior of a metal container
GB2014611B (en) * 1978-02-17 1982-06-16 Standard T Chemical Co Inc Method and apparatus for removing excess electrophoretic material from coated interior workpiece surface
US4400251A (en) * 1981-06-05 1983-08-23 Aluminum Company Of America Method and apparatus for simultaneously electrocoating the interior and exterior of a metal container

Also Published As

Publication number Publication date
DE3463791D1 (en) 1987-06-25
EP0118756B2 (fr) 1992-09-02
US4659445A (en) 1987-04-21
DE3304940A1 (de) 1984-08-16
JPH0429756B2 (fr) 1992-05-19
ES8501012A1 (es) 1984-11-01
EP0118756A1 (fr) 1984-09-19
ES529625A0 (es) 1984-11-01
ATE27311T1 (de) 1987-06-15
JPS59153897A (ja) 1984-09-01
DK58584A (da) 1984-08-13
DK58584D0 (da) 1984-02-09

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