US 7,285,201 B2Granted

Process for electrocoating metal blanks and coiled metal substrates

AssigneePPG Industries Ohio, Inc.

InventorsDonald D. Emmonds, Catharine A. Palmer, Linda K. Anderson, Robin M. Peffer, Donald W. Boyd, Paul R. Kerr

Life of this patent

Estimating the term…

Loading patent…

Abstract

Processes for forming a coating on electroconductive flat blanks having two major surfaces and sheared edges are provided. Also provided is a process for forming a multi-composite coating on a pre-sheared, electroconductive, flat blank having two major surfaces and sheared edges. Methods for forming and coating metal blanks are also provided. The present invention further provides a pre-sheared, flat electroconductive blank having two major surfaces and coated with a multi-layer composite coating composition on one major surface. The present invention also provides a method for coating a continuous metal strip, optionally, thereafter forming a coated blank therefrom, and, optionally, applying a second coating to the blank.

Claims37

Dependent claims

A method for forming a multi-layer composite coating on a pre-sheared, electroconductive, flat blank having two major surfaces and sheared edges, said process comprising the following steps:

(1) conveying the blank to a first electrodeposition bath located on a coating line;
(2) applying a first aqueous electrodepositable coating composition to both major surfaces and the sheared edges of the blank as it passes through the electrodeposition,
the blank serving as an electrode in an electrical circuit comprising the electrode and a counter-electrode immersed in the aqueous electrodepositable coating composition, the composition being deposited onto both major surfaces and the sheared edges of the blank as a substantially continuous electroconductive coating as electric current is passed between the electrodes;
(3) conveying the coated blank of step (2) from the first electrodeposition bath to a first curing station located on the coating line;
and drying the electroconductive coating as it passes through the first drying station;
(4) conveying the coated blank of step (3), to a second electrodeposition bath located on the coating line;
(5) applying a second electrodepositable coating composition to the coated blank as it passes through the second electrodeposition bath,
the blank serving as an electrode in an electrical circuit comprising the electrode and a counter-electrode immersed in the second aqueous electrodepositable coating composition, the composition being deposited onto one of the major surfaces of the coated blank as a substantially continuous electrically insulating coating as electric current is passed between the electrodes;
(6) conveying the coated blank of step (5) to a drying station located on the coating line;
(7) curing the electrically insulating coating as the blank of step (6) passes through the drying station;
and
(8) forming the coated blank of step (7).

9 more elements

A method for forming and coating metal blanks comprising the following steps:

(1) supplying a continuous metal strip from a coil through an entrance of a shear located prior to an entrance end of a first electrodeposition bath located on a coating line;
(2) shearing the metal strip to form a flat blank having two major surfaces and sheared edges as the metal strip passes through the shear;
(3) conveying the blank formed in step (2) to the first electrodeposition bath;
(4) applying a first aqueous electrodepositable coating composition to both major surfaces and the sheared edges of the blank as it passes through the first electrodeposition bath,
the blank serving as an electrode in an electrical circuit comprising the electrode and a counter-electrode immersed in the first aqueous electrodepositable coating composition, the composition being deposited onto both major surfaces and the sheared edges of the blank as a substantially continuous electrically conductive coating as electric current is passed between the electrodes;
(5) conveying the coated blank of step (4) to a first drying station located in the coating line, and curing the coated blank as it passes through the drying station;
(6) conveying the coated blank of, step (5) to a second electrodeposition bath located on the coating line;
(7) applying a second electrodepositable coating composition to the coated blank as it passes through the second electrodeposition bath,
the blank serving as an electrode in an electrical circuit comprising the electrode and a counter-electrode immersed in the second aqueous electrodepositable coating composition, the composition being deposited onto one of the major surfaces of the coated blank as a substantially continuous electrically insulating coating as electric current is passed between the electrodes;
(8) conveying the coated blank of step (7) to a drying station located on the coating line;
(9) curing the electrically insulating coating as the blank passes through the drying station;
and
(10) forming the coated blank of step (9).

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/460,143Filed 12 Jun 2003 · division
Priority: 2 Mar 2001
Published: US 2004/0016643 A129 Jan 2004
Granted: 23 Oct 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

B05D 7/544
No clear coat specified: the first layer is let to dry at least partially before applying the second layer
C09D 5/4488
For electrophoretic applications: cathodic paints
C25D 5/48
Electroplating characterised by the process; Pretreatment or after-treatment of workpieces: after-treatment of electroplated surfaces
C25D 7/0614
Wires; Strips; Foils: strips or foils

Family

Application09/798,627Parent of this division · filed 2 Mar 2001
US 2004/0016643 A1Pre-grant publication · published 29 Jan 2004
US 6,676,820 B2Parent of this division
US 2002/0168551 A1Published application
US 7,285,201 B2This patent

From the US filing history. Foreign family members aren’t listed.