US2794388A - Method of preparing a lithographic printing plate - Google Patents
Method of preparing a lithographic printing plate Download PDFInfo
- Publication number
- US2794388A US2794388A US542782A US54278255A US2794388A US 2794388 A US2794388 A US 2794388A US 542782 A US542782 A US 542782A US 54278255 A US54278255 A US 54278255A US 2794388 A US2794388 A US 2794388A
- Authority
- US
- United States
- Prior art keywords
- printing plate
- gelatin
- image
- plate
- printing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007639 printing Methods 0.000 title claims description 52
- 238000000034 method Methods 0.000 title claims description 7
- 108010010803 Gelatin Proteins 0.000 claims description 38
- 239000008273 gelatin Substances 0.000 claims description 38
- 229920000159 gelatin Polymers 0.000 claims description 38
- 235000019322 gelatine Nutrition 0.000 claims description 38
- 235000011852 gelatine desserts Nutrition 0.000 claims description 38
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 30
- 239000000976 ink Substances 0.000 claims description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 15
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 claims description 14
- 239000001263 FEMA 3042 Substances 0.000 claims description 14
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 claims description 14
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 claims description 14
- 229940033123 tannic acid Drugs 0.000 claims description 14
- 235000015523 tannic acid Nutrition 0.000 claims description 14
- 229920002258 tannic acid Polymers 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000839 emulsion Substances 0.000 claims description 12
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- 238000007645 offset printing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-PWCQTSIFSA-N Tritiated water Chemical compound [3H]O[3H] XLYOFNOQVPJJNP-PWCQTSIFSA-N 0.000 claims 1
- 239000000243 solution Substances 0.000 description 11
- 238000009736 wetting Methods 0.000 description 8
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000000123 paper Substances 0.000 description 6
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 6
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 6
- 239000000049 pigment Substances 0.000 description 5
- 239000005018 casein Substances 0.000 description 4
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 4
- 235000021240 caseins Nutrition 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- PLXMOAALOJOTIY-FPTXNFDTSA-N Aesculin Natural products OC[C@@H]1[C@@H](O)[C@H](O)[C@@H](O)[C@H](O)[C@H]1Oc2cc3C=CC(=O)Oc3cc2O PLXMOAALOJOTIY-FPTXNFDTSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 229910001864 baryta Inorganic materials 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- -1 aluminum chloride sodium bisulfate Chemical compound 0.000 description 1
- 235000010323 ascorbic acid Nutrition 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- 229940092690 barium sulfate Drugs 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 229960000359 chromic chloride Drugs 0.000 description 1
- LJAOOBNHPFKCDR-UHFFFAOYSA-K chromium(3+) trichloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Cl-].[Cr+3] LJAOOBNHPFKCDR-UHFFFAOYSA-K 0.000 description 1
- 239000011636 chromium(III) chloride Substances 0.000 description 1
- 235000007831 chromium(III) chloride Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 230000005660 hydrophilic surface Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/06—Silver salts
Definitions
- This invention relates to lithography-and particularly -toa methodfor improving :the-ink receptivity of lithographic printing plates.
- Lithographic printingplates have a hydrophilic surface which repels lithographic printing ink. -ln-use, an image is' formed'on the surface of-the plate which accepts ink and which printsthe-imagein a lithographic printing press.
- a suitable paper printing plate has a melamine-formaldehyde sized paper stock of medium weight coated with a mixture of gelatin and baryta containing a gelatin hardening agent such as formaldehyde or aluminum chloride.
- a suitable plate may also be formed of -a sized paper stock of medium weight rendered water repellant with a casein coating having about 0.15 to .6 g. of casein per square foot of surface.
- the casein coating may contain an inert pigment such as clay or baryta and may be treated, if desired, with 'a cuprammonium solution or a salt solution such as zinc acetate before, after or during application to the casein-pigment coat of a thin coating of a hydrophilic colloid such as sodium algin-ate, as described in U. S. Patent 2,534,650.
- an inert pigment such as clay or baryta
- a cuprammonium solution or a salt solution such as zinc acetate
- the photographic gelatin image which is to be transferred to the printing plate may be formed in various ways, but preferably is made and transferred as described in Yutzy and Yackel U. S. Patents 2,596,756 and 2,716,059.
- a substantially unhardened gel'atino-silver halide which contains a tanice ning developing agent or both a tanning and a non-tanning developing agent is exposed to a line or halftone image and developed to form a tanned or hardened gelatin image.
- the tanned gelatin image may also be formed by-use of an external developing agent not incorporated in the emulsion layer. After a tanned or hardened gelatin image is formed in this way the remaining gelatin which is.
- the gelatin image. transferred in this way is soft and hydrophilic and must be rendered ink receptive as well -as sufiiciently vhard and, tough to withstand abrasionand printing onthe lithographic press. -We have found that this maybe accomplished by treating the plate after the gelatinimage has been transferred to it, with a solution containing tannic acid and thiourea and other agents if desired.
- the solution used to treat the plate may contain ascorbic acid, aluminum chloride sodium bisulfate, potassium. bichromate, hydrochloric acid or chromic chloride.
- Example 1 An image of a typewritten document was formed in a light-sensitive emulsion in the manner described in Yutzy and Yackel U. SfPatent 2,716,059 and the unha-rdened gelatin of the sensitive material was transferred to a lithographic printing plate instead of to a sheet of absorbent paper. A printing plate of the type described above was used, in this case .a plate sold under the trade name Remington Rand 'Plastiplate. The transferred gelatin image was .swabbed' for 20 seconds with a solution of tannic acid and thiourea in water containing 10% tannic acid and 5% thiourea. The plate was heated for 20 .secends with .lightfrom two. Photoflood lamps about one foot away and was then moistened. with water or conventional lithographic etching solution, placed on an offset press and run under standard printing conditions. A run of, 500 copies was :obtained.
- Example 2 A typewritten document was exposed to the sensitive material described in Example 1 and the transfer made to a lithographic printing plate such as described above, in this case a plate sold under the trade name Polychrome V Kote Plate.
- the transferred image was swabbed with a solution in water of 4% tannic acid, 4% sodium bisulfate and 4% thiourea.
- the treated plate was then placed on an offset press and to copies were made in the usual way.
- thiourea in our formulas is particularly important since ink receptivity of the plate on the press is dependent on this material.
- the usual gelatin tanning agents are ineffective in the presence of thiourea but tannic acid is effective to harden the gelatin when thiourea is present.
- Example 3 A lithographic printing plate such as described above, for example, a plate known as Quality Direct Image Plate sold by Polychrome Corporation of Yonkers, New York, or 7900 Series Plastiplate sold by Remington Rand Division of Sperry-Rand Corporation was hand rubbed with a 2% borax solution and dried. A transfer of a typewritten image was then made to the plate as described in Example 1 and the plate was swabbed with the solution of tannic acid, sodium bisulfate and thiourea described in Example 2. The plate was then run on' an offset press and at least 100 copies were obtained.
- a lithographic printing plate such as described above, for example, a plate known as Quality Direct Image Plate sold by Polychrome Corporation of Yonkers, New York, or 7900 Series Plastiplate sold by Remington Rand Division of Sperry-Rand Corporation was hand rubbed with a 2% borax solution and dried. A transfer of a typewritten image was then made to the plate as described in Example 1 and the plate was swabbed with the
- the method of preparing a lithographic printing plate having good lithographic ink receptivity and durability which comprises forming by exposure and development in a 'gelatino-silver halide emulsion layer of unhardened gelatin, a hardened gelatin image, transferring the unhardened gelatin portions of said emulsion layer to a lithographic printing plate which will repel greasy printing inks when wet with water, wetting the surface of the printing plate and the transferred gelatin image with a solution containing approximately 4% to tannic acid and approximately 4% to 5% thiourea, and
- the method of preparing a lithographic printing plate having good lithographic ink receptivity and durability which comprises forming by exposure and development in a gelatino-silver halide emulsion layer of unhardened gelatin, a hardened gelatin image, transferring the unhardened gelatin portions of said emulsion layer to a lithographic printing plate which will repel greasy printing inks when wet with water, wetting the surface of the printing plate and the transferred gelatin image Withfan aqueous solution containing 4% tannic acid, 4%,thiourea and 4% sodium bisulfate, and then wetting the surface of the printing plate with water and placing it on anroifset printing press.
- the method of preparing a lithographic printing plate having good lithographic ink receptivity and durability which comprises forming by exposure and development in a gelatino-silver halide emulsion layer of unhardened gelatin, a hardened gelatin image, washing the acidic surface of a lithographic printing plate which will repel greasy printing inks when wet with ater, with an alkaline solution to neutralize its acidity, transferring the unhardened gelatin portions of said emulsion layer to said printing plate, wetting the surface of the printing plate and me transferred gelatin image with an aqueous solution containing 4% tannic acid, 4% thiou'rea and 4% sodium bisulfate, and then wetting the surface of the printing plate with water and placing it on an offset printing press.
- An aqueous solution for treating a lithographic printing plate having a gelatin image thereon comprising approximately 4% to 10% tannic acid, approximately 4% to 5% thiourea and approximately 4% sodium bisulfate.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE551933D BE551933A (en, 2012) | 1955-10-25 | ||
| US542782A US2794388A (en) | 1955-10-25 | 1955-10-25 | Method of preparing a lithographic printing plate |
| FR1158449D FR1158449A (fr) | 1955-10-25 | 1956-10-22 | Procédé de préparation d'une planche d'impression lithographique, solution pour sa mise en oeuvre et produit obtenu |
| GB32226/56A GB825866A (en) | 1955-10-25 | 1956-10-23 | Method of making a lithographic printing plate suitable for lithographic printing and hardening solution therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US542782A US2794388A (en) | 1955-10-25 | 1955-10-25 | Method of preparing a lithographic printing plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2794388A true US2794388A (en) | 1957-06-04 |
Family
ID=24165258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US542782A Expired - Lifetime US2794388A (en) | 1955-10-25 | 1955-10-25 | Method of preparing a lithographic printing plate |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2794388A (en, 2012) |
| BE (1) | BE551933A (en, 2012) |
| FR (1) | FR1158449A (en, 2012) |
| GB (1) | GB825866A (en, 2012) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3043688A (en) * | 1959-05-20 | 1962-07-10 | Eastman Kodak Co | Photographic colloid transfer process |
| US3083097A (en) * | 1957-04-26 | 1963-03-26 | Agfa Ag | Bleaching silver images in the formation of printing plates |
| US3089770A (en) * | 1958-09-02 | 1963-05-14 | Agfa Ag | Process for making planographic printing forms using a light sensitive gelatin reception layer |
| US3091531A (en) * | 1961-02-23 | 1963-05-28 | Eastman Kodak Co | Hardening gelatin-silver halide lithographic offset printing plates |
| US3095808A (en) * | 1960-07-28 | 1963-07-02 | Eastman Kodak Co | Photoconductolithography employing rubeanates |
| US3126281A (en) * | 1959-02-04 | 1964-03-24 | Formula | |
| US3394653A (en) * | 1965-10-12 | 1968-07-30 | Robert E. Riesberg | Novel method of cleaning paper planographic plates |
-
0
- BE BE551933D patent/BE551933A/xx unknown
-
1955
- 1955-10-25 US US542782A patent/US2794388A/en not_active Expired - Lifetime
-
1956
- 1956-10-22 FR FR1158449D patent/FR1158449A/fr not_active Expired
- 1956-10-23 GB GB32226/56A patent/GB825866A/en not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| None * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3083097A (en) * | 1957-04-26 | 1963-03-26 | Agfa Ag | Bleaching silver images in the formation of printing plates |
| US3089770A (en) * | 1958-09-02 | 1963-05-14 | Agfa Ag | Process for making planographic printing forms using a light sensitive gelatin reception layer |
| US3126281A (en) * | 1959-02-04 | 1964-03-24 | Formula | |
| US3043688A (en) * | 1959-05-20 | 1962-07-10 | Eastman Kodak Co | Photographic colloid transfer process |
| US3095808A (en) * | 1960-07-28 | 1963-07-02 | Eastman Kodak Co | Photoconductolithography employing rubeanates |
| US3091531A (en) * | 1961-02-23 | 1963-05-28 | Eastman Kodak Co | Hardening gelatin-silver halide lithographic offset printing plates |
| US3394653A (en) * | 1965-10-12 | 1968-07-30 | Robert E. Riesberg | Novel method of cleaning paper planographic plates |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1158449A (fr) | 1958-06-13 |
| GB825866A (en) | 1959-12-23 |
| BE551933A (en, 2012) |
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