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US3559570A
Expired / Lapsed
US
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Method of preparing and using a gravure printing plate
Assignee: Xerox Corp
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Filing: 1966-07-20
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Granted: 1971-02-02
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Expires: 1986-07-20
Abstract
Abstract A method of producing a reusable gravure printing plate and copies from same is disclosed which allows the use of aqueous developers in connection with a gravure plate molded out of or coated with hydrophobic composition. It has been found that when electrostatic charges are placed on the surface of a charge carrier having hydrophobic properties aqueous liquids formerly incapable of wetting the surface now are retained by reason of the presence of the electrostatic charge pattern. This discovery is employed in conjunction with the gravure imaging process of the present invention. For, example, a gravure dispensing member is coated with a layer of hydrophobic photoconductive composition. The resulting photoconductive gravure member is electrostatically charged in the dark selectively exposed and developed using an aqueous base developer employing well-known xerographic techniques. The developed surface of the plate may then be contacted to a copy sheet to produce a reproduction of the original.
Inventors
- 👤 Robert W Martel
- 👤 John W Weigl
- 👤 Joseph Mammino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:58
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G15/00; G03G15/22; G03G5/08; G03G5/085; G03G5/10; G03G5/14; G03G9/00; G03G9/16; G03G9/18; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
18 words
The process as described in claim 1 wherein said photoconductive composition comprises a hydrophobic resinous charge transfer complex.
Claim 2
Dependent Claim
13 words
The process as described in claim 1 wherein said photoconductive composition comprises selenium.
Claim 3
Dependent Claim
33 words
The process as described in claim 1 wherein said photoconductive composition comprises a hydrophobic binder insulating material having dispersed therein a member selected from the group consistiNg of organic and inorganic photoconductive materials.
Claim 4
Dependent Claim
18 words
The process as described in claim 4 wherein said dispersed member is an organic photoconductive material comprising phthalocyanine.
Claim 5
Dependent Claim
19 words
The process as described in claim 4 wherein said dispersed member is an inorganic photoconductive material comprising zinc oxide.
Claim 6
Independent Claim
106 words
A method of preparing a reusable gravure printing plate which comprises forming a gravure pattern substantially completely on the surface of a support substrate, said pattern comprising a hydrophobic photoconductive composition and having a cell spacing ranging from about 50 to about 300 cells per inch, forming an electrostatic charge on the surface of said gravure pattern, selectively exposing said charged surface so as to produce an electrostatic latent image, applying to the surface of said exposed surface an aqueous-base developer in such a manner that the developer is distributed thereon conforming to said latent image in an imagewise configuration to form said gravure printing plate.
Claim 7
Dependent Claim
41 words
The process as defined in claim 7 wherein said support substrate comprises a rotagravure cylinder and said photoconductive composition is selected from at least one member of the group consisting of a hydrophobic resinous charge transfer complex, selenium and zinc oxide.
Claim 8
Dependent Claim
23 words
The process as described in claim 7 wherein said photoconductive composition comprises a hydrophobic resinous binder with an organic photoconductive material comprising phthalocyanine.
Claim 9
Independent Claim
142 words
A method of preparing multiple copies from a gravure printing plate which comprises: a. forming an electrostatic latent image on the surface of a photoconductive member, said member comprising a substrate having fixed substantially completely to the surface thereof in a gravure pattern a hydrophobic photoconductive insulating composition said pattern having a cell spacing ranging from about 50 to about 300 cells per inch; b. developing said latent image with an aqueous-base developer in such a manner that said developer is distributed thereon conforming to said latent image in an imagewise configuration; c. contacting said developed image with a copy sheet thereby transferring said aqueous developer held in the recessed areas of the gravure pattern to the surface of said copy sheet in an imagewise configuration; and d. repeating the above steps in their given sequence to form a multiplicity of reproductions.
Claim 10
Dependent Claim
41 words
The process as described in claim 10 wherein said photoconductive member comprises a rotagravure cylinder and said photoconductive composition is selected from at least one member of the group consisting of a hydrophobic resinous charge transfer complex, selenium and zinc oxide.
Claim 11
Dependent Claim
25 words
The process as described in claim 10 wherein said photoconductive member comprises a hydrophobic resinous binder having dispersed therein an organic photoconductive material comprising phthalocyanine.
Claim 12
Independent Claim
153 words
A method of making multiple copies from a xerographic image which comprises: a. forming a gravure pattern substantially completely on the surface of a support substrate, said pattern comprising a hydrophobic photoconductive composition, and having a cell spacing ranging from about 50 to about 300 cells per inch; b. developing an electrostatic charge on the surface of said gravure pattern; c. selectively exposing said charged surface so as to produce an electrostatic latent image; d. applying to said exposed surface an aqueous-based developer in such a manner that said developer is distributed thereon conforming to said latent image in an imagewise configuration; e. contacting said developed image with a copy sheet thereby transferring said aqueous developer held in the recessed areas of the gravure pattern to the surface of said copy sheet in an imagewise configuration; and f. repeating steps b through e in their given sequence to form a multiplicity of reproductions.
Claim 13
Dependent Claim
48 words
The process as describeD in claim 13 wherein said support substrate comprises a rotagravure cylinder and said photoconductive composition is selected from at least one member of the group consisting of a hydrophobic resinous charge transfer complex, selenium, zinc oxide, and phthalocyanine dispersed in a hydrophobic resinous binder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |