Title:
APPARATUS FOR ELECTRO-DIPCOATING
Document Type and Number:
WIPO Patent Application WO/2000/050670
Kind Code:
A2
Abstract:
In the case of an apparatus for electro-dipcoating small electrically conductive parts, having a tank (6) with a predetermined filling height for receiving a dipping bath of electrically conductive, liquid coating agent, a delivery tube (1), which is rotatable about its axis, for transporting the small parts in its longitudinal direction, having a small-part inlet opening (4), a small-part outlet opening (12) and a ribbon screw (5) attached to the inner side of the delivery tube (1), the delivery tube (1) being arranged in relation to the tank (6) in such a way that a coating section (9) of the delivery tube (1) extending in the longitudinal direction of the said delivery tube (1) lies partly below the predetermined filling height of the tank (6), and a first electrode (16), which is connected to one pole of a current source and is arranged on the inner side of the coating section (9) of the delivery tube (1), and a second electrode (14), which is connected to the other pole of the current source. The object is to improve the quality of the coated small parts. This object is achieved by the second electrode (14) being arranged within the coating section (9) of the delivery tube (1), in the tank, below the predetermined filling height of the tank.
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Inventors:
BELZ HANS (DE)
BECK HELMUT (DE)
SCHAUF WERNER (DE)
BECK HELMUT (DE)
SCHAUF WERNER (DE)
Application Number:
PCT/EP2000/001437
Publication Date:
August 31, 2000
Filing Date:
February 22, 2000
Export Citation:
Assignee:
DOERKEN EWALD AG (DE)
BELZ HANS (DE)
BECK HELMUT (DE)
SCHAUF WERNER (DE)
BELZ HANS (DE)
BECK HELMUT (DE)
SCHAUF WERNER (DE)
International Classes:
C25D13/22; C25D17/28; (IPC1-7): C25D17/00
Foreign References:
| US2624728A | 1953-01-06 | |||
| DE4205672A1 | 1993-08-26 | |||
| US4427518A | 1984-01-24 | |||
| FR844447A | 1939-07-25 | |||
| FR2446871A1 | 1980-08-14 | |||
| FR702863A | 1931-04-18 | |||
| US1557474A | 1925-10-13 |
Attorney, Agent or Firm:
WENZEL & KALKOFF (Flasskuhle 6 Witten, DE)
Download PDF:
Claims:
Claims
| 1. | Apparatus for electrodipcoating small electrically conductive parts, having a tank (6) with a predetermined filling height for receiving a dipping bath of electrically conductive, liquid coating agent (KTL; ATL), a delivery tube (1), which is rotatable about its axis, for transporting the small parts in its longitudinal direction, having a smallpart inlet opening (4), a smallpart outlet opening (12) and a ribbon screw (5) attached to the inner side of the delivery tube (1), the delivery tube (1) being arranged in relation to the tank (6) in such a way that a coating section (9) of the delivery tube (1) extending in the longitudinal direction of the said delivery tube (1) lies partly below the predetermined filling height of the tank (6), and a first electrode (16), which is connected to one pole of a current source and is arranged on the inner side of the coating section (9) of the delivery tube (1), and a second electrode (14), which is connected to the other pole of the current source, characterized in that the second electrode (14) is arranged within the coating section (9) of the delivery tube (1), in the tank, below the predetermined filling height of the tank. |
| 2. | Apparatus according to Claim 1, characterized in that the second electrode (14) is designed as a plate (19) which in cross section is in the form of a segment of a circle. |
| 3. | Apparatus according to Claim 2, characterized in that the plate (19) has bars (20) extending radially outwards with respect to the delivery tube. |
| 4. | Apparatus according to one of Claims 1 to 3, characterized in that the second electrode (14) has a plastic mesh (38) on its radially outer side. |
| 5. | Apparatus according to one of Claims 1 to 4, characterized in that the delivery tube (1) has essentially a planar inside surface between the small part inlet opening (12) and the smallpart outlet opening (4). |
| 6. | Apparatus according to one of Claims 1 to 5, characterized in that the smallpart outlet opening (12) is arranged on the circumference of the delivery tube (1) downstream of the coating section (9) of the delivery tube and of the tank (6), as considered from the direction of delivery. |
| 7. | Apparatus according to Claim 6, characterized in that the smallpart outlet opening (12) is assigned a transporting device (13) for the small parts, which is arranged relative to the smallpart outlet opening (12) in such a way that downwardly falling small parts are taken up by the transporting device (13) and transported essentially perpendicularly with respect to the delivery tube (1). |
| 8. | Apparatus according to one of Claims 6 or 7, characterized in that a rinsing device (31; 32a, 32b, 32c) for applying rinsing liquid to the small parts is arranged above the transporting device (13). |
| 9. | Apparatus according to one of Claims 6 to 8, characterized in that the transporting device (13) is designed as a conveyor belt. |
| 10. | Apparatus according to one of Claims 1 to 9, characterized in that the coating section (9) of the delivery tube (1) is arranged at such a distance in the direction of delivery from the smallpart inlet opening (12) that air is removed from the small parts before they reach the coating section (9). |
| 11. | Apparatus according to one of Claims 1 to 10, characterized in that a circuit for the coating agent, which has a cooling means (37), at least one filter (23,35) and an ultrafiltration module (26), is provided. |
| 12. | Apparatus according to Claim 11, characterized in that a circuit for the rinsing liquid, in which the rinsing liquid contains filtrate formed by the ultrafiltration module (26), is provided. |
Description:
INTERNATIONAL SEARCH REPORT Irrtev anal Application No PCT/EP00/01437 C. (CoMinuatlon) DOCUMENTS CONSIDERED TO BE RELEVANT Category ° Citation of document, with indication, where appropnate, of the relevant passages Relevant to daim No. Y DE 42 05 672 A (DOERKEN EWALD AG) 10 26 August 1993 (1993-08-26) cited in the application figure1 claim 11 A1,6,7,9 figure 1 X US 4 427 518 A (DE VRIES HANS ET AL) 1,6-8 24 January 1984 (1984-01-24) figures1,3 column 5, line 16-19,33-42,50-52 X FR 844 447 A (P. DEVAUZE AND É. MOREL 1 FRANCE (SEINE)) 25 July 1939 (1939-07-25) figures1,4 page 3, line 28-line 33 page 2, line 36-line 40 page 2, line 42-line 48 A FR 2 446 871 A (RYMLAND ROBERT) 1,5 14 August 1980 (1980-08-14) figures1,2 page 5, line 32-line 35 page 6, line 23-line 25 page 8, line 12-line 18 page 10, line 11-line 13 A FR 702 863 A (SOCIÉTÉ ANONYM: WALDBERG, 1,2 FRANCE (SEINE)) 18 April 1931 (1931-04-18) figures1,2 page 2, line 9-line 15 A US 1 557 474 A (H. B. FARRAND, 1,2,6,7, PHILADELPHIA, PENNSYLVANIA) 9 13 October 1925 (1925-10-13) figures 2-4 page 1, line 99-page 2, line 9 claims1,2 4 INTERNATIONAL SEARCH REPORT IrrtemalApplication No Intormauon on patent tamlW membrs PCT/EP 00/01437 Patent document Publication Patent Publication cited in search report date member (s) date US 2624728 A 06-01-1953 NONE DE 4205672 A 26-08-1993 AT 134000 T 15-02-1996 AU 663924 B 26-10-1995 AU 3448393 A 13-09-1993 CA 2124082 A 02-09-1993 CZ 9402043 A 14-06-1995 DE 4390620 D 11-01-1996 WO 9317155 A 02-09-1993 DE 59301602 D 21-03-1996 DK 627022 T 09-04-1996 EP 0627022 A 07-12-1994 ES 2083279 T 01-04-1996 HU 68104 A, B 29-05-1995 JP 2613173 B 21-05-1997 JP 7503500 T 13-04-1995 US 5433834 A 18-07-1995 US 4427518 A 24-01-1984 DE 3127390 A 10-02-1983 AT 11433 T 15-02-1985 CA 1184531 A 26-03-1985 CS 236675 B 15-05-1985 DD 202462 A 14-09-1983 DE 3150545 A 30-06-1983 DE 3262046 D 07-03-1985 DK 309482 A, B, 11-01-1983 EP 0070011 A 19-01-1983 FI 822457 A, B, 11-01-1983 HU 183995 B 28-06-1984 JP 1627134 C 28-11-1991 JP 2049400 B 30-10-1990 JP 58019495 A 04-02-1983 NO 821788 A, B, 11-01-1983 SU 1192629 A 15-11-1985 FR 844447 A 25-07-1939 NONE FR 2446871 A 14-08-1980 NONE FR 702863 A 18-04-1931 NONE US 1557474 A 13-10-1925 NONE