EP0432517A1 - Procédé pour le laquage par électrophorèse de la surface interne d'un récipient métallique à symétrie de révolution - Google Patents

Procédé pour le laquage par électrophorèse de la surface interne d'un récipient métallique à symétrie de révolution Download PDF

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Publication number
EP0432517A1
EP0432517A1 EP90122048A EP90122048A EP0432517A1 EP 0432517 A1 EP0432517 A1 EP 0432517A1 EP 90122048 A EP90122048 A EP 90122048A EP 90122048 A EP90122048 A EP 90122048A EP 0432517 A1 EP0432517 A1 EP 0432517A1
Authority
EP
European Patent Office
Prior art keywords
container
electrode
wall
liquid
rotation
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.)
Ceased
Application number
EP90122048A
Other languages
German (de)
English (en)
Inventor
Reiner Eichler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0432517A1 publication Critical patent/EP0432517A1/fr
Ceased 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
    • 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

Definitions

  • the invention relates to a method for electrophoretically painting the inner walls of rotationally symmetrical metal containers according to the preamble of claim 1.
  • Electrophoretic painting is carried out as dip painting, with the workpieces to be painted being immersed in a dip tank. A voltage difference is generated between the workpieces and the metallic wall of the immersion basin, which causes the resins and pigments of colloidal order of magnitude dissolved or dispersed in the liquid to deposit on the workpiece surface. Strong stirring movements bring pigments and binders to the workpiece surface. The migration of the particles in the electric field and their deposition begins in the diffusion layer adhering to the workpiece to be painted, a series of reactions, such as diffusion in the layer, coagulation, electrolysis and electroosmosis playing a role.
  • the workpiece is a container, the inner wall of which is to be painted, then the painting of the inner wall is carried out by means of an auxiliary electrode which is inserted into the inside of the container.
  • the inside of the container is filled with the lacquer.
  • This is also an electro-dip coating, in which the outer wall of the container is usually lacquered at the same time.
  • the container Since the container floats as long as it is not filled, it is necessary to provide forced guidance of the container in the plunge pool. Because of the usually small container openings, there are relatively long filling and emptying times, which are often considerably longer than the actual painting time. During the diving process, the container is tumbled to avoid missing parts due to air or gas bubbles. Furthermore, the extreme foam development in the immersion bath during the filling and emptying process is a disadvantage. In particular, however, it has been shown that the quality of the coating on the inner wall is worse than that on the outer wall, since, in contrast to the outer wall, no rest movements can be carried out in the interior of the container.
  • the object is to improve the process in such a way that an optimal coating of the inner wall can be achieved when using the smallest possible amount of lacquer.
  • the circular-cylindrical container 1 has a longitudinal wall 2 and a first base 3 and a second base 4.
  • the second floor 4 is provided with a central opening 5 which runs centrally to the longitudinal axis 6 of the container.
  • the longitudinal axis 6 of the container simultaneously represents the axis of rotation of the rotationally symmetrical container 1.
  • an electrode 7 is introduced into the interior of the container 1, which is designed as a tube and has a contour that is adapted to the rotational cross section of the inner wall of the container 1.
  • the electrode 7 is introduced via the opening 5.
  • a bearing 8 is provided in the region of the opening 5, which seals the opening 5, but enables the container 1 to rotate relative to the bearing 8.
  • a vent pipe 9 is also guided through this bearing 8.
  • the electrode 7 is inserted so that it occupies a position opposite the lower region of the inner wall of the container 1.
  • the container is tilted into the position shown in FIG. 1, in which the axis of rotation 6 of the container 1 is inclined to the horizontal.
  • the angle of inclination ⁇ of the axis of rotation 6 relative to the horizontal 10 is determined on the one hand by the container length and on the other hand by the container diameter, such that the center 11 of the bottom 3 and the point 12 of the inner wall, which defines half the container length, lie on a horizontal.
  • Liquid lacquer is then pumped into the interior of the container via the tubular electrode 7, the amount being selected so that the liquid level 13 is slightly higher than points 11, 12.
  • the electrode 7 has several bores along its length .
  • the container 11 which is rotatably mounted on rollers (not shown), is now rotated and a voltage difference is generated between the container 1 and the electrode 7. Paint is now deposited in the area of the inner wall formed by the first floor 3 and the right halves of the longitudinal wall 2.
  • the container 1 is tilted about the axis 14 with the angle ⁇ in the opposite direction, rotated about the axis of rotation 6 and a voltage difference is again generated between the container 1 and the electrode 7. In this way, the second floor 4 and the left half of the inner wall are now coated.
  • the aforementioned axis 14 runs in the middle of the length of the container 1 at right angles to the axis of rotation 6.
  • the liquid lacquer is removed from the interior of the container, which can be done, for example, by pumping out via the tubular electrode 7 and emptying the residue via the ventilation pipe 9.
  • the electrode 7 assumes a position in which it faces the lower area of the inner wall and in which it is immersed in the liquid lacquer over a substantial length.
  • Their shape should be such that they are at essentially the same distance from the lower area of the inner wall at all points.
  • a plunge pool 15 is provided, the basin wall of which is connected to the same voltage as the electrode 7.
  • the region of the tank which is essentially determined by the liquid level 13 in the interior of the tank, is immersed in this plunge pool 15.
  • the container 1 is rotated about its axis of rotation 6 as prescribed, so that in the position shown the outside of the right half of the longitudinal wall 2 and the first bottom 3 are coated.
  • the container 1 is tilted into a horizontal position, to the right move and tilted in the opposite direction, so that when the container is rotated again, the bottom 4 and the left half of the longitudinal wall 2 are coated inside and outside.
  • the immersion bath 15 can simultaneously serve to remove the process heat generated in the interior of the container. If such a plunge pool is not provided, a cooling pool corresponding to the plunge pool 15 can be used for cooling or the container 1 is sprinkled with water during the inner coating.
  • the interior of the container 1 can be rinsed with rinsing liquid, with the procedure as described above when the electrode 7 is inserted.
  • the amount of liquid lacquer that is required for the inner coating is significantly less than the inner volume of the container 1. In the manner described above, containers can be coated inside and outside that are significantly larger than the immersion pool 15.
  • the opening 5 need not be arranged centrally in the bottom 4.
  • An eccentric arrangement is also possible.
  • the filling quantity and the shape of the electrode 7 must then be adapted to the respectively smaller or larger radius.

Landscapes

  • 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)
  • Electrostatic Spraying Apparatus (AREA)
EP90122048A 1989-11-21 1990-11-17 Procédé pour le laquage par électrophorèse de la surface interne d'un récipient métallique à symétrie de révolution Ceased EP0432517A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3938602 1989-11-21
DE19893938602 DE3938602C1 (fr) 1989-11-21 1989-11-21

Publications (1)

Publication Number Publication Date
EP0432517A1 true EP0432517A1 (fr) 1991-06-19

Family

ID=6393927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90122048A Ceased EP0432517A1 (fr) 1989-11-21 1990-11-17 Procédé pour le laquage par électrophorèse de la surface interne d'un récipient métallique à symétrie de révolution

Country Status (2)

Country Link
EP (1) EP0432517A1 (fr)
DE (1) DE3938602C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008144989A1 (fr) * 2007-05-25 2008-12-04 Wuhan Lisheng Super Filtration Science And Technology Ltd. Tube électrophorétique en acier, son procédé électrophorétique de finition et équipement complet
CN109423683A (zh) * 2017-08-30 2019-03-05 广东新会中集特种运输设备有限公司 集装箱的涂装系统及集装箱的涂装方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649477A (en) * 1968-05-14 1972-03-14 Bart Mfg Co Electroplating large cylindrical tanks

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649477A (en) * 1968-05-14 1972-03-14 Bart Mfg Co Electroplating large cylindrical tanks

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 195 (C-83)[867], 11. Dezember 1981; & JP-A-56 116 898 (HONDA GIKEN KOGYO) 12-09-1981 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008144989A1 (fr) * 2007-05-25 2008-12-04 Wuhan Lisheng Super Filtration Science And Technology Ltd. Tube électrophorétique en acier, son procédé électrophorétique de finition et équipement complet
CN109423683A (zh) * 2017-08-30 2019-03-05 广东新会中集特种运输设备有限公司 集装箱的涂装系统及集装箱的涂装方法
CN109423683B (zh) * 2017-08-30 2021-03-23 广东新会中集特种运输设备有限公司 集装箱的涂装系统及集装箱的涂装方法

Also Published As

Publication number Publication date
DE3938602C1 (fr) 1991-05-08

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