US3663383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing painted metal sheet
Assignee: Yawata Iron and Steel Co Ltd
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Filing: 1968-06-05
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Granted: 1972-05-16
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Expires: 1988-06-05
Abstract
Abstract A method for manufacturing a painted metal sheet by successive paintings comprises the steps of (a) subjecting a metal sheet plated with zinc or zinc alloy to an electrophoretic treatment with a water-soluble resin series paint to provide an undercoating, then (b) painting the steel sheet having the electro-deposited paint coating with a water-soluble or solventsoluble paint to provide a final coat, and then (c) baking and drying the undercoat and the final coat at the same time. Step (a) may optionally be preceded by a step of subjecting the initial metal sheet, plated with zinc or zinc alloy, to a chemical-synthetic treatment to form a foundation for subsequent painting.
Inventors
- 👤 Shozo Matsuda
- 👤 Tadashi Tanaka
- 👤 Kouzou Murayama
- 👤 Kunimitsu Yamamoto
- 👤 Joji Oka
- 👤 Royji Takahashi
- 👤 Megumi Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:36
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/54; B05D7/542; C; C25; C25D; C25D13/00; C25D13/20; C25D13/22; B05D1/00; B05D1/007; B05D1/28; B05D2202/00; B05D2252/00; B05D2252/02; B05D2252/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A method for manufacturing a painted metal sheet by successively painting flat metal sheet or strip coil which is plated with zinc or zinc alloy, which comprises the steps of subjecting the said metal sheet or strip coil to an electrophoretic painting with a water-soluble acrylic resin series paint as a underpainting, rinsing and wind-drying the undercoat formed by the electrophoretic painting, and immediately thereupon non-electrophoretically painting the undercoated metal sheet or strip coil with at least one kind of thermosetting paint selected from the group consisting of the organic solvent-soluble phenol resin series, the melamine resin series, the alkyd resin series, the acrylic resin series and the vinyl resin series or their copolymers as the final painting and then baking the resultant electrodeposited undercoat and final coat together in a single baking step.
Claim 2
Independent Claim
190 words
A method for manufacturing a painted steel sheet or strip coil by successively painting steel sheet or strip coil which is plated with zinc or zinc alloy, which comprises the steps of subjecting the steel sheet or strip coil to an electrophoretic painting by dipping the same into a water-soluble electrodepositing treating bath, said bath consisting of a water-soluble resin, which is composed of acrylic ester and/or methacrylic ester and its ammonium salt or amine salt, and a water-soluble chromium compound added in an amount of about 0.01 to 5.0 weight percent to the said resin, rinsing and drying the undercoat formed by the electrophoretic painting, when the coat is deposited in an amount of 150 mg/dm2, and immediately thereupon non-electrophoretically painting the undercoated steel sheet or strip coil with at least one kind of thermosetting paint selected from the group consisting of phenol resin series, melamine resin series, alkyd resin series, acrylic resin series and vinyl resin series or their copolymers as the final painting and baking the resultant electrodeposited undercoat and thermosetting final coat at the same time in a single baking step and cooling the resultant product.
Claim 3
Dependent Claim
28 words
A method as claimed in claim 3, wherein a water-soluble phosphoric acid series additive or boric acid series additive or pigment is added to the electrodepositing treating bath.
Claim 4
Dependent Claim
55 words
A method as claimed in claim 4, wherein the steel sheet or strip coil which is plated with zinc or zinc alloy, is further subjected to a phosphate treatment or chromate treatment or other coat treatment to obtain a phosphate coat or chromate coat or a coat having high electric resistance at the outermost layer.
Claim 5
Independent Claim
143 words
A method for manufacturing a painted steel sheet or strip coil by successively painting steel shEet or strip coil, which is plated with zinc or zinc alloy, which comprises the steps of subjecting the steel sheet or strip coil to a chemical-synthetic treatment to obtain a coat having a high electric resistance, then subjecting the chemical-synthetically treated steel sheet or strip coil to an electrophoretic painting with a water-soluble paint or a water-dispersed paint, while keeping the electric resistance of the chemical-synthetically formed coat to below 10 Omega cm2, rinsing and wind-drying the undercoat formed by the electrophoretic painting and then subjecting the resultant undercoated steel sheet or strip coil to a non-electrophoretic final painting with an organic solvent-soluble thermosetting paint as the final painting and thereafter baking the resultant undercoat electrodeposited and the thermosetting final coat together in a single baking step.
Claim 6
Dependent Claim
23 words
A method as claimed in claim 6, wherein the electric resistance of the chemical-synthetically formed coat is kept to below 5 Omega cm2.
Claim 7
Independent Claim
136 words
A method for manufacturing a painted steel sheet or strip coil by successively painting steel sheet or strip coil which is plated with zinc or zinc alloy, which comprises the steps of subjecting steel sheet or strip coil to an electrophoretic painting after optional chemical-synthetical treatment, in advance, while regulating the contact rolling pressure between the steel sheet or strip to be treated and a conductor roll so that it is above about 100 kg per one meter width of the steel sheet or strip coil, rinsing and wind-drying the undercoat formed by the electrophoretic painting and then subjecting the resultant undercoated steel sheet or strip coil to a non-electrophoretic final painting with an organic solvent-soluble thermosetting paint and thereafter baking the resultant undercoat electrodeposited and the thermosetting final coat together in a single baking step.
Claim 8
Dependent Claim
46 words
A method as claimed in claim 8, wherein the contact rolling pressure between the steel sheet or strip coil to be treated and the conductor roll is regulated to be more than about 300 kg per one meter width of the steel sheet or strip coil.
Claim 9
Independent Claim
197 words
A method for manufacturing a painted steel sheet or strip coil by successively painting steel sheet or strip coil, which is plated with zinc or zinc alloy, which comprises the steps of subjecting the steel sheet or strip coil to a chemical-synthetical treatment to obtain an undercoat as a foundation for painting which has high electric resistance, and then subjecting the chemical-synthetically treated steel sheet or strip coil to an electrophoretic painting with a water-soluble paint or a water-dispersed paint, while removing solidified melt stuck to the surface of a conductor roll, to which electricity is supplied, such as zinc or zinc oxide, by means of a doctor blade, immediately after it has stuck to the surface of the conductor roll and arranging the surface of the conductor roll, which is brought into contact with the said steel sheet or strip coil, rinsing and wind-drying the resultant undercoat formed by the electrophoretic painting and then subjecting the resultant undercoated steel sheet or strip coil to a non-electrophoretic final painting with an organic solvent-soluble thermosetting paint as the final painting and thereupon baking the resultant undercoat electrodeposited and the thermosetting final coat together in a single baking step.
References Cited (Backward Citations)
FR1405550A
Cited
GB1073965A
Cited
US3408278A
Cited
US3437574A
Cited
US3441489A
Cited
US3362899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |