EP0019669A1 - Verfahren und Vorrichtung für die elektrochemische Behandlung einer Blechdose - Google Patents

Verfahren und Vorrichtung für die elektrochemische Behandlung einer Blechdose Download PDF

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Publication number
EP0019669A1
EP0019669A1 EP79300914A EP79300914A EP0019669A1 EP 0019669 A1 EP0019669 A1 EP 0019669A1 EP 79300914 A EP79300914 A EP 79300914A EP 79300914 A EP79300914 A EP 79300914A EP 0019669 A1 EP0019669 A1 EP 0019669A1
Authority
EP
European Patent Office
Prior art keywords
cell
wall
electrolyte
mandrel
treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP79300914A
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English (en)
French (fr)
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EP0019669B1 (de
Inventor
Thomas Patrick Murphy
George Bell
Fred Fidler
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.)
Crown Packaging UK Ltd
Original Assignee
Metal Box PLC
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 Metal Box PLC filed Critical Metal Box PLC
Priority to DE7979300914T priority Critical patent/DE2965983D1/de
Priority to EP79300914A priority patent/EP0019669B1/de
Publication of EP0019669A1 publication Critical patent/EP0019669A1/de
Application granted granted Critical
Publication of EP0019669B1 publication Critical patent/EP0019669B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/005—Contacting devices
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/02—Tanks; Installations therefor
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C25D17/12—Shape or form
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow bodies
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating

Definitions

  • This invention relates to the electro-chemical treatment of a surface of a Container and more particularly but not exclusively to a method and apparatus for electrolytically treating a container body drawn from sheet metal.
  • Container bodies which are drawn from sheet metal to have a cylindrical side wall closed at one end by an end wall. During the drawing process the surfaces of the sheet metal are subjected to frictional engagement with the drawing tools and the surface may become scratched or generally disturbed. This disturbance is more apparent on containers which have been wall ironed than on containers which have been redrawn with a positive clearance between punch and die.
  • the tinplates used for the manufacture of drawn containers, comprise a layer of tin on the mild steel substrate.
  • the surface of the tin is usually passivated by a known chemical treatment.
  • the passivated tinplate is drawn, in a press tool, the tin layer is subjected to frictional engagement with the tool surface and so the passivated layer is liable to be destroyed.
  • the degree of drawing or redrawing is severe, as could be the case in a wall ironing operation, the tin layer may be broken to leave the steel beneath, exposed and vulnerable to attack when the container is packed with certain food products, as is well known in the art.
  • One known remedy is to use tinplate having a thicker layer of tin but this is a costly remedy.
  • aluminium sheet used for manufacture containers is often anodised, etched or treated with chromates because such surface treatments help subsequent organic coatings ,to adhere to the sheet.
  • these surface finishes for aluminium sheet may also be spoiled in the press tool and so with both drawn aluminium containers and drawn tinplate containers there is a need for a method and apparatus for repairing the surfaces of the containers after the metal working operations; such operations may include drawing; re-drawing with a positive clearance;, redrawing with a negative clearance herein called wall ironing; flanging or beading.
  • Tinplate container bodies having a side seam are commonly soldered. However, certain products require that the side seam be protected after forming, the usual remedy being the application of a stripe of organic lacquer. Tinplate container bodies having a welded side seam also suffer damage to the metal surface adjacent the weld and again there is a need for a method of repairing the interrupted surfaces of the metal of the side seam.
  • British Patent Number 1498 795 describes a method and apparatus for cleaning can bodies by means of a solvent or detergent which removes the greasy lubricants.
  • the method described therein comprises mounting the container in a cavity in a body; the cavity having a shape corresponding approximately to that of the container, with the walls of the cavity spaced close to the surfaces of the container; and the container sub-dividing the cavity into two chambers; and passing the cleaning fluid through the chambers so that the cleaning fluid fills the chambers and flows along the surfaces of the container.
  • the flow is preferably turbulent to obtain a good cleaning action, in contrast to the galvanic actions which are the subject of this specification.
  • the invention provides a method of treating a surface of a can body drawn from sheet metal said method including the steps of placing the can body in a cell so that at least an exterior surface of the body is in close spaced relationship with the wall of the cell, entering an electrolyte between the wall of the cell and the exterior surface of the can and thereafter applying a potential difference between the can and the cell wall to treat the surface of the can.
  • the method includes the further steps of draining the electrolyte from the cell and thereafter removing the can from the cell.
  • the method includes the further steps of introducing a second electrolyte into the cell after removal of the first electrolyte and applying a second potential difference between the can and the cell to apply a second treatment to the exterior surface of the can.
  • the method includes the steps of introducing an internal electrode into the can, entering an electrolyte between the interior of the can and the internal electrolyte; and applying a potential difference between the interior of the can and the internal electrode.
  • the electrolyte used to treat the inside surface of the can may also be used to treat the outside of the can.
  • the method may include anionic or cationic treatment or treatments of the surface of the can.
  • the surface of the can is electrocleaned and repassivated.
  • a coating of an electrocoating material is preferably applied to the repassivated surface.
  • said method includes the steps of electrocleaning and electrodetinning.
  • the detinned surface is preferably electroplated with a coating containing chromium and thereafter electrocoated with an organic coating material.
  • the invention provides apparatus for treating an external surface of a can body drawn formed from sheet metal, said apparatus comprising an electrochemical cell adapted to surround the surface to be treated in spaced close proximity thereto, means to create a potential difference between the body and the cell wall, and means to introduce an electrolyte into the space between the cell wall and external surface to be treated.
  • the apparatus comprises a cell having a cell wall and a mandrel said cell wall being adapted to surround a can placed therein, the said mandrel being adapted to enter the can, said cell wall and mandrel defining an electrode in close proximity to both the inside and outside surface of the can to be treated.
  • the apparatus has means to pass a first electrolyte between the outside surface of the can and the cell wall and a second electrolyte between the inside surface of the can and the mandrel, so that both inside and outside surfaces of the can may be treated simultaneously or sequentially.
  • An electrode may be used to press the flange of the can body into engagement with a spacer ring to hold the can body in close spaced proximity to the mandrel and cell wall, so that an electrolyte may be passed between the internal wall of the can body and the mandrel and between the external wall of the can body and the cell wall.
  • the invention provides a can made by a method according to the invention or by means of an apparatus according to the invention.
  • the can body 1 of Fig. 1 has a concave end wall 2 and a side wall 3 extending from the periphery of the end wall to terminate in a flange 4, which defines the open end of the can body.
  • the can body 1 has been drawn from a single piece of sheet metal and thereafter been wall ironed so that the side wall 3 is thinner than the end wall 2.
  • the side wall is therefore in need of repair treatment to restore the surface while the surfaces of the concave end wall are substantially unaltered from the sheet condition.
  • Fig. 2 the can body 1 has been placed mouth upwards in apparatus comprising a cell 5 which is closed by a cover 6.
  • the cell 5 has a bottom 7 and a sidewall 8 which surrounds the can body 1 in close spaced relationship, a typical distance between the side wall and can being less than 0.25 inches.
  • An insulating post 9 extends axially up from the bottom 7 to keep the can body 1 off the bottom 7.
  • An entry conduit for treating fluid is provided at the bottom of the cell and an exit is provided.
  • the cover 6 has a mandrel 10, extending axially downwards therefrom into the cell 5, which serves to hold the can body 1 centrally within the cell 5 and firmly down on the insulating post 9 so that the external surface of the can body 1 is substantially evenly spaced from the internal surfaces of the cell 5.
  • An insulating gasket 11 seals the joint between the lid 6 and the cell 5.
  • the lid 6 is given a positive polarity which is conducted through the mandrel 10 to the can body 1.
  • the cell 5 is given a negative polarity, so that a direct current may be passed through a fluid in the cell. Therefore, when an electrocoating material is introduced as arrowed, into the cell the can becomes coated with a surface coating. After coating the can, the spent electrocoating material is drained from the cell and the coated can is removed from the cell.
  • Fig. 3 the can body 1 has been placed mouth downwards to surround a mandrel 12.
  • the can body 1 is held centrally by the top electrodes 17 of a cell 14 holding it firmly in a ring 15 which has an annular groove thereon to receive the flange 4.
  • the ring 15 holds the flange of the can body clear of the cell to define a "U" shape passage for fluid to pass from the outside of the can to the inside.
  • a contact post or electrodes 17 extend through an insulator 18 in the lid 13, to engage with the bottom 2 of the can body.
  • the top wall 13 engages with the body of the cell 14 near the top of the cell 14 so that the outer wall of the cell 14 and mandrel 12 within define an electrode.
  • the electrolyte is passed into the cell 14 through the central bore 19 in the mandrel 12 so that the electrolyte is deflected by the can bottom 12 so that the electrolyte is deflected by the can bottom 2 to pass between the can 1 and the mandrel 12.
  • the electrolyte passes around the flanges 4 of the can to pass between the outside of the can and the wall of cell 14, and upwards to fill the cell.
  • FIG. 4 apparatus is shown which has passage ways as arrowed to conduct the treating fluid first across the external surface of the can body and then across the internal surface of the can body.
  • the apparatus of Fig. 4 comprises a cell 21 and a cover 22.
  • the cell has a bottom wall 23 and a side wall 24.
  • a mandrel 25 extends centrally upwards from the bottom wall 23 within the side wall 24 to define therewith, an annular cavity and to further define, with the cover 22, a space above the mandrel 25.
  • An insulating locator ring 26 having triangular ribs 27 surrounds the mandrel 25 and rests on the bottom wall 23.
  • the can body 1 is located centrally by the ribs 27 to be substantially equidistant from the side wall 24 and the mandrel 25.
  • a contact post 28 extends through an insulating grommet 29 to press on the end wall 2 the can body and so make good electrical contact.
  • the treating fluid enters through the bottom wall 23 via the passage 30 and passes as arrowed, between the exterior surface of the can body 1 and the interior surface of the cell side wall 24, to leave through the passage 31 which leads the treating fluid back towards the bottom wall 23 for entry into the central passage 32 in the mandrel 25.
  • the fluid Upon emerging from the passage 32 the fluid impinges on the interior surface of the end wall 2 and passes on between the interior surface of the side wall of the can and the mandrel 25 to leave through the bottom wall 23 via passage 33.
  • the feed and exit conduits are preferably annular and arranged to distribute the treating fluid around the surface of the can.
  • the apparatus of Fig. 4 is particularly suitable for incorporation in a rotary machine having a plurality of such cells, such as is shown in Figs. 5 and 6. Each cell is fed with fluids from supply means in the base 38 of the machine 37.
  • the machine 37 can be seen to have a base plate 38 from which extends a centre post 39 which supports a drum cam 40.
  • a turret 41 rotates on the base plate 38, about the centre post 39.
  • the turret comprises a top plate 42, a spacer 43 and a cell block 44.
  • the equispaced arrangement of the cells 45 around the turret 41 is best seen in Fig. 6.
  • Each cell 45 is closed by a cover 46 supported on a rod 47 which is urged to reciprocate by a follower 48, at the upper end, which engages with the drum cam 40, the rod being insulated from the cover, turret and cam.
  • An entry star wheel 49 acting with an entry guide 50 brings each can body 1 in sequence to be fitted in a cell and after treatment an exit star wheel 51, acting with an exit guide 52 removes each can from the apparatus.
  • a positive polarity is imparted to the cans 1 in the cells and a negative polarity is put upon the cell block 44.
  • each cell is being used to perform a like treatment on each can body.
  • the can body 1 is therefore placed in the cell 45A (beneath it as shown in Fig. 5) and as the turret 41 rotates about the central post 39 the co-operation of the follower 48A with the cam 40 causes the rod 47 to close the cover 46A into the cell 45A.
  • the cell is then filled in a manner described with reference to Fig. 4.
  • the rod 47 conducts this polarity to the can body 1 in the cell so that for approximately 180 0 of rotation the galvanic treatment may be continued. If a cell, such as that shown in Fig. 4 is in use both the internal and external surfaces of the can body will be treated.
  • a 40 head unit with a throughput of 1,000 cans/ minute could be constructed to fulfil the following requirements:-
  • Fig. 7 shows diagrammatically how a machine 60 having eight cells may be fitted with two sets of four different treatment cells 61, 62, 63, 64.
  • a transfer turret 72 is used to recycle each can from exit star wheel 71 back into the entry star wheel 73 for delivery to the next cell until the four stage treatment is completed.
  • the reader is directed to consult British Patent Application Number 46 460/74 for more detail.
  • a finished coated can may be detected by an electrical conductivity test to prevent continuous cycling through the apparatus.
  • the dissolution treatments such as tin stripping or cleaning may be accelerated if desired by applying ultrasonic vibration to the can body.
  • the transducer for such vibration may be situated in the mandrel or in the wall of each cell.
  • Figs. 4 to 7 may also be used to carryout a sequence of repair and metal finishing treatments as already described-and examples of such sequences follow:-
  • Example 1 In the production of plain or lacquered drawn and redrawn cans from tinplate, the following steps are used:-
  • Electrocleaning as a separate first stage improves the efficiency and uniformity of treatment of the subsequent stages.
  • the surface treatment chosen could be either the equivalent of the known "311" electrochemical. process of passivation or the known “300” chemical immersion process of passivation. The choice depending upon the specific application and the need for electrocoating.
  • Example 2 In the production of a drawn and wall ironed beverage container, the following steps may be used:-
  • the tin is stripped from the can by anodic dissolution.
  • the additional surface treatment step 1 would be used to replace the tin coating by a film approximately equivalent to that on known steels bearing chromium/chromium oxide layers.
  • the second surface treatment 2 could, if desired, be a passivation treatment.
  • the final stage would be electrocoating with an organic lacquer or the like.
  • the coating composition used for electrocoating may be a water-dispersed coating composition, such as a partially neutralized acrylic interpolymer and an amine-aldehyde condensation product or polyepoxide or both. Examples of such interpolymers are found listed in the patent issued to Donald P. Hart, U.S. Patent No.3,403,088, and assigned to P.P.G. Industries, Inc.
  • the apparatus of the invention may alternatively be used as a means to examine the quality of the electro- chemical treatment or as a separate apparatus for testing coatings applied by conventional means.
  • the invention has been described in terms of cans formed from tin plate and aluminium it is not limited thereto, for example the cans may be built up from components made of blackplate or other mild steel sheets. Furthermore the cans may be drawn from an uncoated steel so that the method and apparatus described provide the all or part of the can finishing,

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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)
  • Electroplating Methods And Accessories (AREA)
EP79300914A 1979-05-23 1979-05-23 Verfahren und Vorrichtung für die elektrochemische Behandlung einer Blechdose Expired EP0019669B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE7979300914T DE2965983D1 (en) 1979-05-23 1979-05-23 A method and apparatus for electrochemical treatment of a can body
EP79300914A EP0019669B1 (de) 1979-05-23 1979-05-23 Verfahren und Vorrichtung für die elektrochemische Behandlung einer Blechdose

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP79300914A EP0019669B1 (de) 1979-05-23 1979-05-23 Verfahren und Vorrichtung für die elektrochemische Behandlung einer Blechdose

Publications (2)

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EP0019669A1 true EP0019669A1 (de) 1980-12-10
EP0019669B1 EP0019669B1 (de) 1983-07-27

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EP79300914A Expired EP0019669B1 (de) 1979-05-23 1979-05-23 Verfahren und Vorrichtung für die elektrochemische Behandlung einer Blechdose

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176717A1 (de) * 1984-10-05 1986-04-09 Schmalbach-Lubeca AG Haltevorrichtung für Dosenrümpfe oder einendig offene Dosen zum Transport auf Förderern
GB2192407A (en) * 1986-07-07 1988-01-13 Metal Box Plc Electro-treating apparatus for coating can bodies; infeed and outfeed devices for such apparatus
GB2208873A (en) * 1987-08-21 1989-04-19 Sb Plating Limited Electroplating internal and external cylindrical surfaces
DE4127740A1 (de) * 1991-08-22 1993-03-04 Klaus Joergens Verfahren und vorrichtung zum pruefen der porositaet von beschichteten gegenstaenden
US9243453B2 (en) 2010-03-31 2016-01-26 Tracto-Technik Gmbh & Co. Kg Method for operating a horizontal drilling device and horizontal drilling device
DE102019204553A1 (de) * 2019-04-01 2020-10-01 Robert Bosch Gmbh Beschichtungsvorrichtung zum Beschichten von Bauteilen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR895968A (fr) * 1943-03-06 1945-02-08 Procédé pour la fabrication de boîtes métalliques, notamment pour conserves, et produit obtenu
CH405042A (fr) * 1962-01-15 1965-12-31 D Emballages Metalliques Socie Procédé pour l'oxydation anodique d'objets creux en un métal oxydable anodiquement
US3716468A (en) * 1971-04-09 1973-02-13 Continental Can Co Method for electrodeposition of cans

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR895968A (fr) * 1943-03-06 1945-02-08 Procédé pour la fabrication de boîtes métalliques, notamment pour conserves, et produit obtenu
CH405042A (fr) * 1962-01-15 1965-12-31 D Emballages Metalliques Socie Procédé pour l'oxydation anodique d'objets creux en un métal oxydable anodiquement
US3716468A (en) * 1971-04-09 1973-02-13 Continental Can Co Method for electrodeposition of cans

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176717A1 (de) * 1984-10-05 1986-04-09 Schmalbach-Lubeca AG Haltevorrichtung für Dosenrümpfe oder einendig offene Dosen zum Transport auf Förderern
DE3436513A1 (de) * 1984-10-05 1986-04-10 Eisenmann Maschinenbaugesellschaft mbH, 7030 Böblingen Haltevorrichtung fuer dosenruempfe oder einendig offene dosen zum transport auf foerderern
US4676366A (en) * 1984-10-05 1987-06-30 Schmalbach-Lubeca Ag Holding device for the retention of can bodies or cans which have one open end during transport of conveyers
GB2192407A (en) * 1986-07-07 1988-01-13 Metal Box Plc Electro-treating apparatus for coating can bodies; infeed and outfeed devices for such apparatus
GB2193507A (en) * 1986-07-07 1988-02-10 Metal Box Plc Removing a can from a rotating turret having plural electrocoating cells
GB2193507B (en) * 1986-07-07 1990-12-19 Metal Box Plc Removing a can from a rotating turret
GB2192407B (en) * 1986-07-07 1990-12-19 Metal Box Plc Electro-coating apparatus and method
GB2208873A (en) * 1987-08-21 1989-04-19 Sb Plating Limited Electroplating internal and external cylindrical surfaces
DE4127740A1 (de) * 1991-08-22 1993-03-04 Klaus Joergens Verfahren und vorrichtung zum pruefen der porositaet von beschichteten gegenstaenden
US9243453B2 (en) 2010-03-31 2016-01-26 Tracto-Technik Gmbh & Co. Kg Method for operating a horizontal drilling device and horizontal drilling device
DE102019204553A1 (de) * 2019-04-01 2020-10-01 Robert Bosch Gmbh Beschichtungsvorrichtung zum Beschichten von Bauteilen

Also Published As

Publication number Publication date
DE2965983D1 (en) 1983-09-01
EP0019669B1 (de) 1983-07-27

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