CA1063415A - Planographic printing plate with layer of diazo compound, carbon and nitrocellulose - Google Patents
Planographic printing plate with layer of diazo compound, carbon and nitrocelluloseInfo
- Publication number
- CA1063415A CA1063415A CA216,678A CA216678A CA1063415A CA 1063415 A CA1063415 A CA 1063415A CA 216678 A CA216678 A CA 216678A CA 1063415 A CA1063415 A CA 1063415A
- Authority
- CA
- Canada
- Prior art keywords
- plate
- layer
- printing plate
- image
- planographic 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
- B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
- B41C1/1033—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials by laser or spark ablation
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A planographic printing plate comprising a layer which contains an organic-solvent-soluble negative working diazo compound, carbon particles and nitrocellulose. The plate may be imaged by means of a laser beam in combination with overall exposure to ultraviolet light and developed by means which are conventional in lithographic art.
A planographic printing plate comprising a layer which contains an organic-solvent-soluble negative working diazo compound, carbon particles and nitrocellulose. The plate may be imaged by means of a laser beam in combination with overall exposure to ultraviolet light and developed by means which are conventional in lithographic art.
Description
This invention rela~es to planographic printing plates.
Recently, methods have been proposed to utilize a laser beam to image a planographic (offset) or raised image (letter press) printing plate, see for example, United States Patent Nos. 3,506,779 granted April 14, 1970 (Brown et al) "Laser Beam Type Setter" and United States Patent 3,664,737 granted May 23, 1972 (Lipp) "Printing Plate Recording by Direct Exposure".
While the laser offers great promise in producing high resolution printing plate, there have thus far been limitations which have preven~ed success. In those systems which operate by removing material to form an image, the speed of production is slower than that achieved with conventional chemical etching. It has been proposed in the above-men~ioned United States Patent 3,664,737 to directly image a photosensitive medium with a laser beam which emits light in the ultraviolet region. The disadvantage of such lasers is, however, that they are presently very expensive and do not have a high power output.
This invention concerns improving the production of high quality printing plates by the use of a laser.
According to the present invention, there is provided a method of making an imaged printing plate comprising the steps ^ of:
a. providing a planographic printing plate which com-` prises, on a substrate, a layer which contains an organic-solvent-soluble negative working diazo compound, carbon particles and a - self-oxidating binder.
- b. selectively removing areas of said layer by means of - a laser beam so as to define on the plate an image which is sensitive to ultraviolet light;
-~ 30 c. exposing the plate overall to ultraviolet light; and d. developing the plate to cause the image areas struck by laser beam to accept ink and the non-image areas to accept water.
~`An image is recorded on the plate by writing with a `laser in a conventional manner. Selected areas of the coating are removed by the laser beam so as to define an image on the plate. The coating utilized in the present invention absorbs radiation in the infrared range. A suitable beam may be applied by a YAG (yttrium-aluminum-garnet) laser which has an effective wave length of about 1.06 microns or by an argon laser beam which has an effective length in the range of from about 0.48 to about 0.52 micron. me beam of radiant energy is applied to the coating to vapor-ize and remove it i~ selected areas so as to expose the underlying substrate.
' ., -1- ' ''` '"~ ~ "~
` ``` 1(~63415 For reasons not fully understood by applican~, the areas radiated by the laser become sensitive to ultraviolet light. As a result the plate can be exposed to ultraviolet light and then developed with a conventional additive developer used in the lithographic art. The plate then accepts ink in the area struck by laser beam and accepts water in the non-image areas. Example To a sheet of aluminum was applied a coating of the following composition:
Parts by Weight Carbon 3.3 Nitrocellulose 2.3 Alkyd resin, non-oxidizi~g 7.6 Dia~o sensitizer (the reaction product 3.0 of p-diazodiphenylamine-formaldehyde condensation product and sodium lauryl sulfate~
- 20 Cellulose acetate 11.5 Butyl acetate 5.0 Xylene 3.5 Ethyl cellosolve 110.0 . i .
This coating was prepared at 11.1~ solids and applied to the aluminum foil using a No. 6 mayer rod. The weight of the dry coating was 1.1 pounds per ream.
An image was etched into the plate by means of a Y~G
la9er beam. The plate was exposed overall to a carbon arc lamp for one minute at a distance of approximately 20 inches. Follow-. "
30 ing this, an additive developer was applied to the plate to ; develop the image.
; - The developed plate was mounted on an offset duplicating press and yielded many satisfactory copies. Sub-se~uently, abrasive erasure tests were performed on the plate surface. The results of these test indicated that the plate would be capable of long run length.
*Registered TradeMark .", ~
Recently, methods have been proposed to utilize a laser beam to image a planographic (offset) or raised image (letter press) printing plate, see for example, United States Patent Nos. 3,506,779 granted April 14, 1970 (Brown et al) "Laser Beam Type Setter" and United States Patent 3,664,737 granted May 23, 1972 (Lipp) "Printing Plate Recording by Direct Exposure".
While the laser offers great promise in producing high resolution printing plate, there have thus far been limitations which have preven~ed success. In those systems which operate by removing material to form an image, the speed of production is slower than that achieved with conventional chemical etching. It has been proposed in the above-men~ioned United States Patent 3,664,737 to directly image a photosensitive medium with a laser beam which emits light in the ultraviolet region. The disadvantage of such lasers is, however, that they are presently very expensive and do not have a high power output.
This invention concerns improving the production of high quality printing plates by the use of a laser.
According to the present invention, there is provided a method of making an imaged printing plate comprising the steps ^ of:
a. providing a planographic printing plate which com-` prises, on a substrate, a layer which contains an organic-solvent-soluble negative working diazo compound, carbon particles and a - self-oxidating binder.
- b. selectively removing areas of said layer by means of - a laser beam so as to define on the plate an image which is sensitive to ultraviolet light;
-~ 30 c. exposing the plate overall to ultraviolet light; and d. developing the plate to cause the image areas struck by laser beam to accept ink and the non-image areas to accept water.
~`An image is recorded on the plate by writing with a `laser in a conventional manner. Selected areas of the coating are removed by the laser beam so as to define an image on the plate. The coating utilized in the present invention absorbs radiation in the infrared range. A suitable beam may be applied by a YAG (yttrium-aluminum-garnet) laser which has an effective wave length of about 1.06 microns or by an argon laser beam which has an effective length in the range of from about 0.48 to about 0.52 micron. me beam of radiant energy is applied to the coating to vapor-ize and remove it i~ selected areas so as to expose the underlying substrate.
' ., -1- ' ''` '"~ ~ "~
` ``` 1(~63415 For reasons not fully understood by applican~, the areas radiated by the laser become sensitive to ultraviolet light. As a result the plate can be exposed to ultraviolet light and then developed with a conventional additive developer used in the lithographic art. The plate then accepts ink in the area struck by laser beam and accepts water in the non-image areas. Example To a sheet of aluminum was applied a coating of the following composition:
Parts by Weight Carbon 3.3 Nitrocellulose 2.3 Alkyd resin, non-oxidizi~g 7.6 Dia~o sensitizer (the reaction product 3.0 of p-diazodiphenylamine-formaldehyde condensation product and sodium lauryl sulfate~
- 20 Cellulose acetate 11.5 Butyl acetate 5.0 Xylene 3.5 Ethyl cellosolve 110.0 . i .
This coating was prepared at 11.1~ solids and applied to the aluminum foil using a No. 6 mayer rod. The weight of the dry coating was 1.1 pounds per ream.
An image was etched into the plate by means of a Y~G
la9er beam. The plate was exposed overall to a carbon arc lamp for one minute at a distance of approximately 20 inches. Follow-. "
30 ing this, an additive developer was applied to the plate to ; develop the image.
; - The developed plate was mounted on an offset duplicating press and yielded many satisfactory copies. Sub-se~uently, abrasive erasure tests were performed on the plate surface. The results of these test indicated that the plate would be capable of long run length.
*Registered TradeMark .", ~
Claims (2)
1. The method of making an imaged printing plate compris-ing the steps of:
a. providing a planographic printing plate which comprises, on a substrate, a layer which contains an organic-sol-vent-soluble negative working diazo compound, carbon particles and a self-oxidating binder;
b. selectively removing areas of said layer by means of a laser beam so as to define on the plate an image which is sensitive to ultraviolet light;
c. exposing the plate overall to ultraviolet light; and d. developing the plate to cause the image areas struck by laser beam to accept ink and the non-image areas to accept water.
a. providing a planographic printing plate which comprises, on a substrate, a layer which contains an organic-sol-vent-soluble negative working diazo compound, carbon particles and a self-oxidating binder;
b. selectively removing areas of said layer by means of a laser beam so as to define on the plate an image which is sensitive to ultraviolet light;
c. exposing the plate overall to ultraviolet light; and d. developing the plate to cause the image areas struck by laser beam to accept ink and the non-image areas to accept water.
2. The method in accordance with claim 1 wherein the las-er beam is provided by a YAG laser.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43425774A | 1974-01-17 | 1974-01-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1063415A true CA1063415A (en) | 1979-10-02 |
Family
ID=23723493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA216,678A Expired CA1063415A (en) | 1974-01-17 | 1974-12-23 | Planographic printing plate with layer of diazo compound, carbon and nitrocellulose |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5335482B2 (en) |
| CA (1) | CA1063415A (en) |
| DE (1) | DE2500906A1 (en) |
| FR (1) | FR2258650B1 (en) |
| GB (1) | GB1470530A (en) |
| IT (1) | IT1026289B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2728947C2 (en) * | 1977-06-27 | 1983-10-20 | Hoechst Ag, 6230 Frankfurt | Process for the production of planographic printing forms with laser beams |
| DE2725093C3 (en) * | 1977-06-03 | 1984-04-05 | Rudolf Dr.-Ing. 2300 Kiel Hell | Printing process and arrangement for its implementation |
| CA1249944A (en) * | 1984-06-08 | 1989-02-14 | Howard A. Fromson | Lithographic light trap and process |
| JP3496370B2 (en) * | 1995-11-08 | 2004-02-09 | 東レ株式会社 | Direct drawing type waterless planographic printing plate precursor |
| US5814431A (en) | 1996-01-10 | 1998-09-29 | Mitsubishi Chemical Corporation | Photosensitive composition and lithographic printing plate |
| US5747217A (en) * | 1996-04-03 | 1998-05-05 | Minnesota Mining And Manufacturing Company | Laser-induced mass transfer imaging materials and methods utilizing colorless sublimable compounds |
| US5691098A (en) * | 1996-04-03 | 1997-11-25 | Minnesota Mining And Manufacturing Company | Laser-Induced mass transfer imaging materials utilizing diazo compounds |
| JP3814961B2 (en) | 1996-08-06 | 2006-08-30 | 三菱化学株式会社 | Positive photosensitive printing plate |
-
1974
- 1974-12-23 CA CA216,678A patent/CA1063415A/en not_active Expired
- 1974-12-24 GB GB5584774A patent/GB1470530A/en not_active Expired
-
1975
- 1975-01-09 DE DE19752500906 patent/DE2500906A1/en active Pending
- 1975-01-09 IT IT4760175A patent/IT1026289B/en active
- 1975-01-10 JP JP550575A patent/JPS5335482B2/ja not_active Expired
- 1975-01-10 FR FR7500698A patent/FR2258650B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2258650B1 (en) | 1978-03-17 |
| JPS50102403A (en) | 1975-08-13 |
| IT1026289B (en) | 1978-09-20 |
| JPS5335482B2 (en) | 1978-09-27 |
| DE2500906A1 (en) | 1975-07-24 |
| FR2258650A1 (en) | 1975-08-18 |
| GB1470530A (en) | 1977-04-14 |
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