WO1995004170A1 - Vorrichtung zum elektrophoretischen beschichten der innenoberfläche von hohlkörpern - Google Patents
Vorrichtung zum elektrophoretischen beschichten der innenoberfläche von hohlkörpern Download PDFInfo
- Publication number
- WO1995004170A1 WO1995004170A1 PCT/EP1994/002443 EP9402443W WO9504170A1 WO 1995004170 A1 WO1995004170 A1 WO 1995004170A1 EP 9402443 W EP9402443 W EP 9402443W WO 9504170 A1 WO9504170 A1 WO 9504170A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hollow body
- opening
- nozzle
- conveyor belt
- packaging cans
- Prior art date
Links
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 device for electrophoretically coating the inner surface of an opening on iron, electrically conductive hollow bodies, in particular packaging cans.
- the hollow bodies are passed through an electro-immersion bath in a continuous work process in such a way that they are quickly and completely flooded with immersion bath liquid so that they can be electrophoretically coated with a wet film in the immersion bath. After a sufficient coating time, the hollow bodies are lifted out of the immersion bath again and the immersion bath liquid in them is poured out. The hollow bodies coated in this way are then fed to a drying oven at a mutual distance from one another and dried in the latter, whereupon they can be printed or labeled.
- the hollow bodies can only be uniformly coated externally and internally and must be introduced into the electro-immersion bath in such a way that they are immersed with the opening upwards in order to be quickly and completely flooded and coated, after which they are lifted out of the immersion bath and coated with the opening must be turned down so that the immersion bath liquid can drain off.
- a complex mechanism for immersing, lifting and turning the hollow body is to be provided.
- German laid-open specification 32 20 310 describes a method and a device for the simultaneous electrophoretic coating of the inner and outer surfaces of a hollow body, with which it is possible to coat the inner and outer surfaces differently and with different paints.
- the hollow body is enclosed in a housing with the mouth facing downward and a nozzle device is introduced into its interior, two separate passage channels being formed between the housing and the container on the one hand and the container and nozzle device on the other, each having an inlet and an outlet fill them quickly with the electrophoretic coating material and be able to quickly drain them out of them.
- the inner and outer surfaces of the container are flooded with the coating material which, due to an electrical potential applied between the housing and container on the one hand and the container and nozzle device on the other Deposits surfaces of the hollow body.
- Two separate passage channels are provided for the coating material, each with its own inlet and outlet, so that the inside and outside surfaces of the container can be coated simultaneously with different coating materials and also in different layer thicknesses.
- This device has a complicated structure, since it is basically designed for the simultaneous coating of the outer and inner surfaces of the hollow body. Furthermore, the movable nozzle must be inserted to the bottom of the hollow body, so that the movements to be carried out for each hollow body result in considerable loss of time and rapid coating, especially of packaging cans, cannot be achieved.
- a device for electrophoretically coating the inner surface of an opening having electrically conductive hollow bodies, in particular packaging cans which, according to the invention, has at least one holder forming at least one anode or cathode for at least one hollow body with the opening facing downwards nozzle movable axially relative to the hollow body up to the opening for one the connection to a cathode or anode producing, water-soluble lacquer as electrolyte liquid, an electrically insulating seal for the nozzle, which is in contact with the hollow body opening, and at least one reflux duct in the area between the nozzle and the inner edge of the hollow body opening, which has been passed through the seal.
- the nozzle need only be brought up to the opening of the hollow body and, with its electrically insulating seal, lies against the hollow body opening.
- the water-soluble lacquer is injected centrally into the hollow body, flows down to the bottom of the hollow body and then down the walls and comes out of the hollow body through the return flow channels.
- the hollow body forms the anode or cathode due to the holder connected to a DC voltage source, while the water-soluble lacquer is connected to the cathode or anode as an electrolyte liquid.
- an uninterrupted flow of electrolyte liquid can be conducted through the hollow body and a high-quality coating can be applied to the inner surface of the hollow body within a short time, the paint flow flowing through the reflux channels.
- the movement can also be reversed, i. H. , the nozzle is stationary, and the hollow body is brought up to the nozzle with its opening.
- the holder for the hollow body can be carried out from a horizontally guided conveyor belt with gripping devices, e.g. B. suckers, for the bottoms of a plurality of packaging cans or, if the packaging cans are made of sheet steel, be designed as a horizontally guided above a collecting tray, magnetizable conveyor belt for magnetically holding the bottoms of a plurality of packaging cans.
- gripping devices e.g. B. suckers
- a plurality of nozzles can be arranged on a lifting and lowering device below the conveyor belt, the Hollow bodies are cyclically transported through the conveyor belt into the area of the nozzles, which are raised at the moment the conveyor belt is at a standstill and rest with their electrically insulating seals on the hollow body openings. Then the water-soluble paint is sprayed by means of pumps through the nozzles into the interior of the hollow body and flows through the return flow channels, for. B. back into a sump arranged below the container.
- each nozzle may have a support tube on which is arranged a conical seal with a smaller diameter that can be inserted into the container opening and a larger diameter that exceeds the diameter of the opening, with a plurality of return flow channels starting near the inner edge of the hollow body opening and essentially perpendicularly outside of the support tube are arranged extending.
- these reflux pipes can flow freely above a collecting trough or can be connected to a suction pump, which ensures that the air located in the interior of the hollow body is sucked off, thereby preventing foam formation.
- Fig. 1 is a schematic view of the device according to the invention.
- Fig. 2 is a detailed view of a packaging can with a nozzle in the working position.
- an electrophoretic coating device which usually consists of a degreasing system in front of the coating system and a paint drying system after the coating system, is shown.
- a sump 1 is a stock 2 of water-soluble paint as
- a DC voltage source 3 is connected to a plate 4 arranged in the collecting trough 1 as the cathode and to a conveyor belt 5 guided over a pair of deflection rollers 6 as the anode. Above the lower run of the conveyor belt 5 there is a rail 7 which serves as an abutment.
- Packaging cans 10 are brought to the conveyor belt 5 by means of a conveyor belt 8, which is guided over a pair of guide rollers 9.
- the packaging cans 10 are placed with their opening 15 down on the conveyor belt 8 by means of a device, not shown, and picked up by the conveyor belt 5 when they reach the area of this conveyor belt 5.
- the packaging boxes 10 are made of sheet steel and are therefore ferromagnetic, so that the packaging boxes 10 can be transferred from the conveyor belt 8 to the conveyor belt 5 by the conveyor belt 5 being magnetized. This can be achieved in that the rail 7 is designed as an electromagnet. As a result, the packaging cans 10 are lifted off the conveyor belt 8 and hang with their bottoms 14 on the conveyor belt 5.
- the packaging cans 10 are transported in cycles by the conveyor belt 8, the conveyor belt 5 and a downstream conveyor belt 11, which is guided over a pair of deflection rollers 12. Each time the packaging cans 10, which are magnetically held with their bottoms 14 on the conveyor belt 5, nozzles 16 are raised and with a conical seal 18 made of electrically insulating material, which are connected by means of a yoke 21 to a lifting and lowering device 22 sealingly pressed against flanged edges 13 of the packaging can 10.
- the conical seals 18 are fastened to carrier tubes 17 and have a small diameter which protrude into the openings 15 of the packaging boxes 10, while the outer diameter of the conical seals 18 is larger than the diameter of a flanged edge 13 of the packaging boxes 10.
- pumps 20 are activated which pump water-soluble lacquer as electrolyte from the collecting trough 1 and inject hoses 23 into the container interior via the carrier tubes 17 and the nozzles 16.
- This electrolyte jet rises from the nozzles 16 until it strikes the curved bottom 14 of each beverage can 10. There it is deflected outwards and flows down along the inner surface of the packaging can and through the return flow channels 9, 10 directly into the collecting trough 1.
- the packaging cans 10 Since the water-soluble lacquer sucked in by the pumps 20 is in contact with the cathode 4, while the packaging cans 10 are in contact with the anode, ie the conveyor belt 5, a charge equalization takes place during the flow of the water-soluble lacquer within the packaging cans 10 and thus an electrophoretic coating of the Inner surface of the packaging cans 10 without the External surface comes into contact with any paint particles.
- the packaging cans 10 thus remain completely unaffected on their outer surface by the water-soluble lacquer located in the collecting trough 1, so that no coating takes place on the outer surface.
- a layer thickness that can be adapted to the requirements results.
- FIGS. 1 and 2 shows a system for electrophoretic coating, in which the cathode 4 is arranged in the collecting trough 1, while the conveyor belt 5 forms the anode.
- the cathode 4 is arranged in the collecting trough 1, while the conveyor belt 5 forms the anode.
- the plate 4 it is also possible to design the plate 4 as an anode and accordingly to provide the conveyor belt 5 as a cathode.
- packaging cans made of non-ferrous metal e.g. B. made of aluminum
- suction cups as gripping devices.
- rotary tables arranged above a collecting trough can be used, with an upper plate that uses the gripping device and a lower plate that has the nozzles, which are rotated in cycles, whereby either the packaging cans are lowered cyclically onto the nozzles or the nozzles are raised.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59402846T DE59402846D1 (de) | 1993-07-30 | 1994-07-23 | Vorrichtung zum elektrophoretischen beschichten der innenoberfläche von hohlkörpern |
EP94924800A EP0716718B1 (de) | 1993-07-30 | 1994-07-23 | Vorrichtung zum elektrophoretischen beschichten der innenoberfläche von hohlkörpern |
US08/586,737 US5624540A (en) | 1993-07-30 | 1994-07-23 | Device for the electrophoretic coating of the internal surface of hollow bodies |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4325631.7 | 1993-07-30 | ||
DE4325631A DE4325631C2 (de) | 1993-07-30 | 1993-07-30 | Vorrichtung zum elektrophoretischen Beschichten der Innenoberfläche von Hohlkörpern |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995004170A1 true WO1995004170A1 (de) | 1995-02-09 |
Family
ID=6494095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/002443 WO1995004170A1 (de) | 1993-07-30 | 1994-07-23 | Vorrichtung zum elektrophoretischen beschichten der innenoberfläche von hohlkörpern |
Country Status (4)
Country | Link |
---|---|
US (1) | US5624540A (de) |
EP (1) | EP0716718B1 (de) |
DE (2) | DE4325631C2 (de) |
WO (1) | WO1995004170A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7111476B2 (en) * | 1994-06-30 | 2006-09-26 | Ted A Loxley | Electrophoretic deposition process for making quartz glass products |
US20060032730A1 (en) | 2004-08-13 | 2006-02-16 | Kaufman Paul J | Belt conveyor apparatus |
US7767070B2 (en) * | 2004-08-13 | 2010-08-03 | Ppg Industries Ohio, Inc. | Processes for coating of objects |
US7943028B2 (en) * | 2004-08-13 | 2011-05-17 | Ppg Industries Ohio, Inc. | Method for coating objects |
US7947160B2 (en) | 2004-08-13 | 2011-05-24 | Ppg Industries Ohio, Inc. | System for coating objects |
KR100470750B1 (ko) * | 2004-09-16 | 2005-02-07 | 주식회사 부광 | 전해연마 겸용 전기 도금장치 및 이를 이용한 무전해 도금장치 |
US20070190263A1 (en) * | 2006-02-10 | 2007-08-16 | Finch John G | Internal coating technique for non-cylindrical components |
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 |
CN110835776B (zh) * | 2019-11-13 | 2021-12-14 | 浙江森歌电器有限公司 | 应用于集成灶油网的不粘油涂装工艺 |
WO2021112757A1 (en) * | 2019-12-06 | 2021-06-10 | Hunting Energy Services Pte. Ltd. | Apparatus and method to electroplate a tubular structure surface |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3922213A (en) * | 1974-10-23 | 1975-11-25 | Aluminum Co Of America | Method and apparatus for uniformly electrocoating the interior of a shaped metal container |
EP0118756A1 (de) * | 1983-02-12 | 1984-09-19 | Herberts Gesellschaft mit beschränkter Haftung | Verfahren zum Beschichten einseitig offener Dosen |
US4544475A (en) * | 1983-02-04 | 1985-10-01 | Aluminum Company Of America | Electrocoating apparatus |
Family Cites Families (8)
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 |
US4246088A (en) * | 1979-01-24 | 1981-01-20 | Metal Box Limited | Method and apparatus for electrolytic treatment of containers |
GB2085474B (en) * | 1980-10-15 | 1984-10-10 | Metal Box Co Ltd | Electrocoating |
US4533068A (en) * | 1981-08-17 | 1985-08-06 | Health Care Concepts, Inc. | Sterile solution delivery and venting devices |
US4676881A (en) * | 1986-01-13 | 1987-06-30 | Aluminum Company Of America | Electrocoating cell |
GB2192407B (en) * | 1986-07-07 | 1990-12-19 | Metal Box Plc | Electro-coating apparatus and method |
CA2030033C (en) * | 1989-11-16 | 1997-06-24 | Karsten Loeck | Process and a device for anodic or cathodic electro-coating of hollow bodies, particularly cans |
FR2697539B1 (fr) * | 1992-11-03 | 1994-12-02 | Pechiney Recherche | Méthode, dispositif et appareil de traitement de surface de corps de boîtes métalliques, en particulier an al ou ses alliages. |
-
1993
- 1993-07-30 DE DE4325631A patent/DE4325631C2/de not_active Expired - Fee Related
-
1994
- 1994-07-23 DE DE59402846T patent/DE59402846D1/de not_active Expired - Fee Related
- 1994-07-23 WO PCT/EP1994/002443 patent/WO1995004170A1/de active IP Right Grant
- 1994-07-23 EP EP94924800A patent/EP0716718B1/de not_active Expired - Lifetime
- 1994-07-23 US US08/586,737 patent/US5624540A/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3922213A (en) * | 1974-10-23 | 1975-11-25 | Aluminum Co Of America | Method and apparatus for uniformly electrocoating the interior of a shaped metal container |
US4544475A (en) * | 1983-02-04 | 1985-10-01 | Aluminum Company Of America | Electrocoating apparatus |
EP0118756A1 (de) * | 1983-02-12 | 1984-09-19 | Herberts Gesellschaft mit beschränkter Haftung | Verfahren zum Beschichten einseitig offener Dosen |
Also Published As
Publication number | Publication date |
---|---|
DE4325631C2 (de) | 1996-03-28 |
DE4325631A1 (de) | 1995-02-02 |
DE59402846D1 (de) | 1997-06-26 |
US5624540A (en) | 1997-04-29 |
EP0716718B1 (de) | 1997-05-21 |
EP0716718A1 (de) | 1996-06-19 |
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