US4391879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gravure printing base cylinder, and method of its manufacture
Assignee: WC HERAEUS A OF GERMANY GmbH LLC
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Filing: 1981-12-02
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Granted: 1983-07-05
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Expires: 2001-12-02
Abstract
Abstract A roto-gravure printing base cylinder is made by providing a cylindrical body (1), for example of steel, and applying thereover a cover layer (2) by thermal spraying, for example plasma-spraying, or arc-spraying. The cover layer is made of a material which is inert with respect to electrolytes used in applying a further copper layer over the cover layer to form a finished roto-gravure cylinder for optical engraving, for example an electrochemical valve metal, preferably tantalum, niobium or, most desirably, titanium oxide, forming a matrix in which, before application of the material as a layer on the steel cylinder, electrochemically active materials are applied made of a metal, preferably of the platinum group or other noble metal, and uniformly distributed over the surface, settled on the matrix material.
Inventors
- 👤 Peter Fabian
- 👤 Theo Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:19
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/06; B; B41; B41N; B41N1/00; B41N1/006; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12063
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
80 words
Printing base cylinder, for plating in an electrolyte bath, having a cylindrical body (1); and a cover layer (2) thereon which is electrically conductive, electrochemically active, and inert with respect to the plating electrolyte, wherein, in accordance with the invention, the cover layer (2) comprises a matrix formed by an oxide of a valve metal; and particles homogeneously distributed in said matrix comprising at least one of the materials selected from the group consisting of: a noble metal, iridium; ruthenium.
Claim 2
Dependent Claim
80 words
Printing base cylinder, for plating in an electrolyte bath, having a cylindrical body (1); and a cover layer (2) thereon which is electrically conductive, electrochemically active, and inert with respect to the plating electrolyte, wherein, in accordance with the invention, the cover layer (2) comprises a matrix formed by an oxide of a valve metal; and particles homogeneously distributed in said matrix comprising at least one of the materials selected from the group consisting of: a noble metal, iridium; ruthenium.
Claim 3
Dependent Claim
16 words
Cylinder according to claim 1, wherein the matrix comprises an oxide of titanium, tantalum, or niobium.
Claim 4
Dependent Claim
39 words
Cylinder according to claim 1, wherein the matrix comprises under-stoichiometric titanium oxide in the form of granules, and the particles comprise platinum particles of from 0.1 to 10%, preferably 1 to 5%, by weight, of the matrix settled thereon.
Claim 5
Dependent Claim
22 words
Cylinder according to claim 1, wherein the matrix comprises titanium oxide in the form of TiO 2-x , wherein x=0.04 to 0.06.
Claim 6
Dependent Claim
10 words
Cylinder according to claim 4, wherein the particles comprise platinum.
Claim 7
Dependent Claim
21 words
Cylinder according to claim 5, wherein the platinum particles are present, by weight, by about 1-5%, with respect to the matrix.
Claim 8
Dependent Claim
23 words
Cylinder according to claim 1, wherein said cover layer (2) has a thickness of from between about 0.05 mm to about 1 mm.
Claim 9
Dependent Claim
20 words
Cylinder according to claim 7, wherein the thickness of the cover layer (2) is between about 0.08 and 0.12 mm.
Claim 10
Dependent Claim
31 words
Cylinder according to claim 6, wherein the cover layer (2) is dense or liquid-tight with respect to the electrolyte bath, and has a thickness of between about 0.05 and 0.15 mm.
Claim 11
Dependent Claim
28 words
A roto-gravure printing cylinder comprising the printing cylinder of claim 9; and an outer layer or jacket of copper suitable for photo-engraving applied over said cover layer (2).
Claim 12
Dependent Claim
90 words
Method of making a gravure printing base cylinder for use in an electrolyte bath having a cylinder body (1) and a cover layer (2) applied thereover, comprising the steps of settling electrically conductive particles on a film-forming or valve metal oxide, which particles are inert with respect to the electrolyte of the electrolyte bath, to form a cover coating layer substance; and, after forming said substance, applying said substance in powder or granular form, by thermal spraying on the cylindrical body (1) to thereby form said cover layer (2) thereon.
Claim 13
Dependent Claim
90 words
Method of making a gravure printing base cylinder for use in an electrolyte bath having a cylinder body (1) and a cover layer (2) applied thereover, comprising the steps of settling electrically conductive particles on a film-forming or valve metal oxide, which particles are inert with respect to the electrolyte of the electrolyte bath, to form a cover coating layer substance; and, after forming said substance, applying said substance in powder or granular form, by thermal spraying on the cylindrical body (1) to thereby form said cover layer (2) thereon.
Claim 14
Dependent Claim
11 words
Method according to claim 11, wherein the applying step comprises plasma-spraying.
Claim 15
Dependent Claim
11 words
Method according to claim 11, wherein said applying step comprises arc-spraying.
Claim 16
Dependent Claim
43 words
Method of making a roto-gravure printing cylinder comprising: carrying out the steps of claim 11 and then immersing the coated cylinder body (1) with the cover layer (2) thereon in the electrolytic bath and depositing a copper jacket on said cover layer (2).
Claim 17
Dependent Claim
56 words
Method of removing a roto-gravure copper jacket from a rotor-gravure printing cylinder wherein said printing cylinder comprises the cylinder of claim 10 including the step of immersing said printing cylinder in an electrolyte bath; and removing said copper jacket by anodic removal, with application of current polarized to remove the copper jacket from said cover layer.
References Cited (Backward Citations)
US1643046A
Cited
US1831645A
Cited
US2127824A
Cited
US2776256A
Cited
US3923610A
Cited
US4060882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |