EP0113521B1 - Vorläufer für eine lichtempfindliche Flachdruckplatte - Google Patents

Vorläufer für eine lichtempfindliche Flachdruckplatte Download PDF

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Publication number
EP0113521B1
EP0113521B1 EP19830307185 EP83307185A EP0113521B1 EP 0113521 B1 EP0113521 B1 EP 0113521B1 EP 19830307185 EP19830307185 EP 19830307185 EP 83307185 A EP83307185 A EP 83307185A EP 0113521 B1 EP0113521 B1 EP 0113521B1
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EP
European Patent Office
Prior art keywords
light
desensitizing
printing plate
plate precursor
aqueous solution
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
Application number
EP19830307185
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English (en)
French (fr)
Other versions
EP0113521A2 (de
EP0113521A3 (en
Inventor
Toshifumi Asahi Shimbun Publishing Company Arai
Harumasa Fuji Photo Film Co. Ltd. Kitago
Isao Fuji Photo Film Co. Ltd. Nakagoshi
Shizuo Fuji Photo Film Co. Ltd. Miyano
Nobuyuki Fuji Photo Film Co. Ltd. Kita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Holdings Corp
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Fuji Photo Film Co Ltd
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Filing date
Publication date
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Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Publication of EP0113521A2 publication Critical patent/EP0113521A2/de
Publication of EP0113521A3 publication Critical patent/EP0113521A3/en
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Publication of EP0113521B1 publication Critical patent/EP0113521B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development

Definitions

  • the present invention relates to a light-sensitive lithographic printing plate precursor. More particularly, it relates to a light-sensitive lithographic printing plate precursor that provides a lithographic printing plate which does not cause scumming with the edges thereof.
  • the light-sensitive lithographic printing plate precursor formed on an aluminum support is being sold under the name of presensitized plate (abbreviated as PS plate). It is now in general use.
  • PS plates are produced by treating aluminum supports in the form of web or sheet, applying a sensitizing solution, drying, and cutting to size.
  • the treatment include graining, anodizing, and chemical treatment, which are used individually or in combination with one another.
  • the plate obtained by subjecting a PS plate to exposure and development is satisfactory for printing on a sheet-fed press in which the plate is larger than the printing paper and the edges of the plate are not used for printing.
  • Figure 1 is a schematic sectional view of a PS plate treated in accordance with this invention, in which there are shown an aluminum support at 1, a sensitizing layer at 2, and a coating film of hydrophilic polymeric compound at 3.
  • PS plates can be produced by merely applying a solution of a desensitizing gum to the cut ends of piled PS plates which have been cut into the same size.
  • This method is more suitable to mass production than the conventional method by which the angle of the edge of the aluminum support is rounded off individually.
  • the desensitizing solution may be applied by a known method, e.g., by using a brush, sponge, roller, or spray.
  • the desensitizing solution may be applied to one cut end if only one edge of the plate is involved in printing; but a desensitizing solution should preferably be applied to two cut ends opposite to each other, more preferably to all four cut ends, in anticipation of various printing modes.
  • the desensitizing solution to be applied to the cut ends of PS plates according to this invention is a known desensitizing solution for aluminum-supported lithographic printing plates.
  • the preferred one is an aqueous solution containing a hydrophilic organic polymeric compound.
  • the hydrophilic organic polymeric compound include gum arabic, dextrin, alginate (e.g., sodium alginate), water-soluble cellulose (e.g., carboxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose), polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, water-soluble copolymer containing acrylamide units, polyacrylic acid, copolymer containing acrylic acid units, polymethacrylic acid, copolymer containing methacrylic acid units, copolymer of vinyl methyl ether and maleic anhydride, cornlymer of vinyl acetate and maleic anhydride, and phosphoric acid modified starch.
  • gum arabic because of its high desensitizing action. They may be used in combination with one another, as occasion demands. They should be used in concentration of about 5 to 40 wt%, preferably 8 to 30 wt% based on the total weight of the desensitizing solution.
  • the desensitizing solution used in this invention which is an aqueous solution of hydrophilic organic polymeric compound, should preferably be previously incorporated with a metal salt of a strong acid which enhances the desensitizing action.
  • a metal salt of a strong acid which enhances the desensitizing action.
  • examples of such a salt include sodium salt, potassium salt, magnesium salt, calcium salt, and zinc salt of nitric acid; sodium salt, potassium salt, magnesium salt, calcium salt, and zinc salt of sulfuric acid; sodium salt, potassium salt, magnesium salt, calcium salt, and zinc salt of chromic acid; and sodium fluoride and potassium fluoride. They may be used in combination with one another. They should be used in an amount of about 0.01 to 5 wt% based on the total weight of the desensitizing solution.
  • the pH of the solution should be adjusted to the acid range, preferably 1 to 5, particularly 2 to 4.5, by adding an acid. Therefore, to the aqueous solution which is not acidic, acid should be added.
  • acids to be added for pH adjustment include mineral acids such as phosphoric acid, sulfuric acid, and nitric acid, and organic acids such as citric acid, tannic acid, malic acid, glacial acetic acid, lactic acid, oxalic acid, p-toluene sulfonic acid, and organic phosphonic acid.
  • phosphoric acid because not only does it function as a pH adjusting agent, but it also enhances the desensitizing action.
  • the acid should be used in an amount of 0.01 to 8 wt%, preferably 0.1 to 5 wt%, based on the total weight of the desensitizing solution.
  • the desensitizing solution used in this invention should preferably be incorporated with a wetting agent and/or surface active agent which improves the coatability of the desensitizing solution.
  • wetting agents include lower polyhydric alcohol such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, pentane diole, hexylene glycol, tetraethylene glycol polyethylene glycol, dipropylene glycol, tripropylene glycol, glycerin, sorbitol, and pentaerythritol. Preferable among them is glycerin.
  • surface active agents include nonionic surface active agents such as polyoxyethylene alkylphenyl ether and polyoxyethylene polyoxypropylene blockcopolymer; anionic surface active agents such as fatty acid salts, alkylsulfate ester salt, alkylbenzenesulfonate, alkyl- naphthalenesulfonate, dialkylsulfosuccinate ester salt, alkylphosphate ester salt, naphthalenesulfonic acid, and formalin condensate; and betaine type, glycine type, alanine type, and sulfobetaine type amphoteric surface active agents.
  • nonionic surface active agents such as polyoxyethylene alkylphenyl ether and polyoxyethylene polyoxypropylene blockcopolymer
  • anionic surface active agents such as fatty acid salts, alkylsulfate ester salt, alkylbenzenesulfonate, alkyl- naphthalenesulfon
  • wetting agents and/or surface active agents should be added in an amount of about 0.5 to 10 wt%, preferably 1 to 5 wt%, based on the total weight of the desensitizing solution.
  • the desensitizing solution to be used in this invention may be incorporated with a filler such as silicon dioxide, talc, and clay in an amount less than 2 wt% and with a dye or pigment in an amount less than 1 wt%.
  • a filler such as silicon dioxide, talc, and clay in an amount less than 2 wt% and with a dye or pigment in an amount less than 1 wt%.
  • the desensitizing solution used in this invention is an aqueous solution of hydrophilic polymeric compound as mentioned above; however, an emulsion-type desensitizing solution such as disclosed in U.S. Patent Nos. 4,253,999, 4,268,613, and 4,348,954 may be used. It is used when there is the possibility that the sensitive layer of PS plate might be adversely affected.
  • the application of the above-mentioned desensitizing solution to the cut ends of PS plates may be accomplished by applying the solution to the edge of the individual PS plates. However, it should preferably be accomplished by applying the solution to the cut ends of many piled PS plates (say, 1000 sheets) all at once. It is possible to apply the solution to piled PS plates, each separated by interleaf, as described in Japanese Patent Publication No. 23259/1982, corresponding to U.S. Patent 4,336,093 and Japanese Patent Application (OPI) No. 99647/1982 (The term "OPI” as used herein refers to a "published unexamined Japanese Patent Application"), corresponding U.S. Patent 4,403,030.
  • the desensitizing solution should preferably be applied to the cut ends in a coating weight of about 50 to 150 g/m 2 .
  • Figure 1 is a schematic sectional view of a PS plate obtained as mentioned above.
  • An aluminum support 1 is covered with a sensitive layer 2, and both ends thereof are covered with a coating 3 of hydrophilic polymeric compound formed by applying the desensitizing solution.
  • Positive type PS plates were prepared as follows: Aluminum supports 0.3 mm thick which had undergone graining was partly etched by dipping in 2% sodium hydroxide aqueous solution at 40°C for 1 minute. After rinsing, the aluminum supports were dipped in sulfuric acid-chromic acid mixture for about 1 minute so that the surface of pure aluminum was exposed. The aluminum supports were then anodized in 20% sulfuric acid at 30°C for 2 minutes, at a voltage of 1.5 V DC and a current density of 3 Aldm 2 , followed by rinsing and drying. The aluminum supports were continuously coated with a sensitizing solution of the following composition in a coating weight of 2 g/m 2 (dry basis) by using a roll coater. The coating was dried at 100°C for 2 minutes.
  • the interleaf was polyethylene-laminated (one side) paper composed of substrate paper having a base weight of 50 g/m 2 and a 10-p thick polyethylene layer. It was inserted such a way that the polyethylene layer contacted the photosensitive layer.
  • the piled PS plates were cut to the size of 1310 mm by 800 mm by using a guillotine cutter.
  • the desensitizing solution as mentioned below was applied to the cut ends of the piled PS plates by using a sponge in a coating weight of 70 g/m 2 , followed by drying at room temperature.
  • a desensitizing solution having a viscosity of 13 cps at pH 2.1 was prepared as follows: 61 parts of 30% aqueous solution of gum arabic was diluted with 30 parts of water. To the resulting aqueous solution were added and dissolved 0.7 part of sodium hexametaphosphate, 1 part of sodium nitrate, 1.2 parts of magnesium sulfate, and 2.4 parts of 85% phosphoric acid, with thorough stirring. Finally, 1.2 parts of polyoxyethylene-polyoxypropylene block copolymer (trade name "pluronic”) was added.
  • the PS plate prepared as above was exposed to "Fuji Film PS Light" placed 1 meter away for 30 seconds through a transparent positive film by using a vacuum frame.
  • the light source is Toshiba metal halide lamp, Type MU2000-2-OL, 3 kW, available from Fuji Photo Film Co., Ltd.
  • the exposed plate was developed by dipping in a developing solution of the following composition.
  • the developed PS plates underwent gumming up with a 14° Be aqueous solution of gum arabic. Two sheets of thus treated PS plates were attached side by side to an offset rotary press. Ten thousand sheets were printed in the usual way. The printed matter was satisfactory, with no scumming at the parts corresponding to the edges of the plates.
  • the same PS plates as above were prepared, except that the desensitizing solution was not applied to the cut ends of the PS plates, and printing was carried out as above using the PS plates.
  • the resulting printed matter had scumming at the parts which came into contact with the edges of the plate.
  • PS plates were prepared as follows: Aluminum supports 0.15 mm thick were degreased with an aqueous solution of sodium phosphate. The degreased aluminum supports were electrolytically grained at a current density of 3 A/m 2 in a hydrochloric acid bath and then anodized in a sulfuric acid bath. The aluminum supports were treated with an aqueous solution of sodium metasilicate for sealing. The aluminum supports thus obtained were coated with a sensitizing solution of the following composition in a coating weight of 2.5 g/m 2 (dry basis), by using a whirler, followed by drying at 100°C for 2 minutes.
  • the PS plates were exposed for 40 seconds to a 3 kW metal halide lamp placed 1 meter away through a transparent negative film.
  • the exposed PS plates were developed by dipping in a developing solution of the following composition, with light rubbing with a sponge.
  • the developed PS plates underwent gumming up with a 14° Be aqueous solution of gum arabic. Two sheets of thus treated PS plates were attached side by side to an offset rotary press. Fifty thousand sheets were printed in the usual way. The printed matter was satisfactory, with no scumming at the parts corresponding to the edges of the plate.
  • Example 1 was repeated, except that the following desensitizing solutions A, B, and C were used. In all cases, the printed matter was satisfactory, with no scumming at the parts corresponding to the edges of the plate.
  • Example 2 was repeated, except that the desensitizing solutions A, B, and C used in Examples 3 to 5 were used. In all the cases, the printed matter was satisfactory, with no scumming at the parts corresponding to the edges of the plate.

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  • Printing Plates And Materials Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Claims (12)

1. Vorläufer für eine lichtempfindliche Flachdruckplatte, umfassend einen Aluminiumschichtträger (1) mit einer hydrophilen Oberfläche und einer darauf ausgebildeten lichtempfindlichen Schicht (2), wobei der Aluminiumschichtträger (1) mindestens eine Schnittfläche aufweist, auf welcher eine Beschichtung (3) aus einem desensibilisierenden Gummi vorgesehen ist.
2. Vorläufer für eine lichtempfindliche Flachdruckplatte nach Anspruch 1, bei dem zwei einander gegenüberliegende Schnittflächen des Schichtträgers mit dem desensibilisierenden Gummi beschichtet sind.
3. Vorläufer für eine lichtempfindliche Flachdruckplatte nach Anspruch 1, bei dem alle Schnittflächen des Schichtträgers mit dem desensibilisierenden Gummi geschichtet sind.
4. Vorläufer für eine lichtempfindliche Flachdruckplatte nach einem der Ansprüche 1,2 und 3, bei dem der desensibilisierende Gummi eine synthetische hydrophile organische Polymerverbindung ist.
5. Vorläufer für eine lichtempfindliche Flachdruckplatte nach einem der Ansprüche 1, 2 und 3, bei dem der desensibilisierende Gummi Gummiarabicum ist.
6. Vorläufer für eine lichtempfindliche Flachdruckplatte nach einem der Ansprüche 1 bis 5, bei dem der desensibilisierende Gummi ein Metallsalz einer starken Säure beinhaltet.
7. Verfahren zur Herstellung eines Vorläufers für eine lichtempfindliche Flachdruckplatte, worin eine lichtempfindliche Schicht (2) auf einen Aluminiumschichtträger (1) mit einer hydrophilen Oberfläche aufgebracht ist und der Schichtträger unter Ausbildung mindestens einer Schnittfläche zugeschnitten wird, dadurch gekennzeichnet, daß mindestens eine Schnittfläche mit einer wäßrigen Lösung oder Emulsion eines desensibilisierenden Gummis (3) beschichtet wird.
8. Verfahren nach Anspruch 7, worin der desensibilisierende Gummi in der wäßrigen Lösung oder Emulsion in einer Menge im Bereich von 5 bis 40 Gew.-% vorliegt.
9. Verfahren nach Anspruch 7, worin der desensibilisierende Gummi in der wäßrigen Lösung oder Emulsion in einer Menge im Bereich von 8 bis 30 Gew.-% in Bezug auf das Gesamtgewicht der wäßrigen Lösung oder Emulsion vorliegt.
10. Verfahren nach einem der Ansprüche 7 bis 9, worin die wäßrige Lösung oder Emulsion ein Metallsalz einer starken Säure in einer Menge im Bereich von 0,01 bis 5 Gew.-%, bezogen auf das Gesamtgewicht der wäßrigen Lösung oder Emulsion, enthält.
11. Verfahren nach einem der Ansprüche 7 bis 10, worin die wäßrige Lösung oder Emulsion auf der Schnittfläche in einer Menge im Bereich von 50 bis 150 g/m2 aufgebracht wird.
12. Verfahren nach einem der Ansprüche 7 bis 11, worin der desensibilisierende Gummi Gummiarabicum ist.
EP19830307185 1982-11-26 1983-11-24 Vorläufer für eine lichtempfindliche Flachdruckplatte Expired EP0113521B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP20598382A JPS5997146A (ja) 1982-11-26 1982-11-26 感光性平版印刷版
JP205983/82 1982-11-26

Publications (3)

Publication Number Publication Date
EP0113521A2 EP0113521A2 (de) 1984-07-18
EP0113521A3 EP0113521A3 (en) 1986-08-20
EP0113521B1 true EP0113521B1 (de) 1989-10-04

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ID=16515950

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EP19830307185 Expired EP0113521B1 (de) 1982-11-26 1983-11-24 Vorläufer für eine lichtempfindliche Flachdruckplatte

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EP (1) EP0113521B1 (de)
JP (1) JPS5997146A (de)
DE (1) DE3380667D1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6273269A (ja) * 1985-09-26 1987-04-03 Konishiroku Photo Ind Co Ltd 感光性平版印刷版の処理方法
JPS62138292A (ja) * 1985-12-11 1987-06-22 Toyo Ink Mfg Co Ltd 刷版
JPS6374063A (ja) * 1986-09-18 1988-04-04 Konica Corp 端部の汚れが防止された感光性平版印刷版
JPS63128350A (ja) * 1986-11-18 1988-05-31 Konica Corp 端部の汚れが防止された感光性平版印刷版
JPS63256495A (ja) * 1987-04-14 1988-10-24 Fuji Yakuhin Kogyo Kk 平版印刷用版材及び印刷版
JPH03101996A (ja) * 1989-06-23 1991-04-26 Fuji Photo Film Co Ltd 電子写真式製版用感光性平版印刷版
JPH03182654A (ja) * 1989-12-12 1991-08-08 Kubota Corp ディーゼルエンジンの急加速時スモーク低減装置
JPH0451253A (ja) * 1990-06-19 1992-02-19 Fuji Photo Film Co Ltd 電子写真式平版印刷版の製造方法
FR2688512B1 (fr) * 1992-03-11 2002-01-18 Elf Aquitaine Procede de protection de surfaces solides particulierement les zones littorales contre la pollution par hydrocarbures.
JP3442875B2 (ja) * 1994-08-25 2003-09-02 富士写真フイルム株式会社 感光性平版印刷版
US5826512A (en) * 1995-06-07 1998-10-27 Mitsubishi Chemical Corporation Aluminum planographic printing plate with convexly curved corner
JP2002341558A (ja) 2001-05-11 2002-11-27 Fuji Photo Film Co Ltd 平版印刷版の印刷処理方法及び平版印刷版
JP4684685B2 (ja) 2005-03-03 2011-05-18 富士フイルム株式会社 感光性平版印刷版及びその製造方法
JP6427555B2 (ja) * 2014-02-26 2018-11-21 富士フイルム株式会社 機上現像型平版印刷版原版の処理方法及び印刷方法
CN110028696B (zh) * 2019-04-16 2021-09-10 广东石油化工学院 一种亲水疏油海绵及其制备方法和应用

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2225736A (en) * 1938-02-28 1940-12-24 Ditto Inc Printing plate with smudgeproof edges
US3635709A (en) 1966-12-15 1972-01-18 Polychrome Corp Light-sensitive lithographic plate
JPS5723253B2 (de) * 1974-03-25 1982-05-18
DE2925363C2 (de) 1978-06-23 1985-09-05 Fuji Photo Film Co., Ltd., Minami-Ashigara, Kanagawa Schutzmittel vom Emulsionstyp für die Oberfläche von lithographischen Druckplatten
DE2925362C2 (de) 1978-06-23 1985-08-14 Fuji Photo Film Co., Ltd., Minami-Ashigara, Kanagawa Schutzmittel vom Emulsionstyp für die Oberfläche von lithographischen Druckplatten
JPS5629243A (en) 1979-08-15 1981-03-24 Fuji Photo Film Co Ltd Laminating method for photosensitive printing plate
JPS5944784B2 (ja) 1980-07-16 1984-11-01 株式会社東芝 相補型ｍｏｓ半導体装置
JPS5834341B2 (ja) * 1980-08-27 1983-07-26 昭和製袋工業株式会社 窓穴付き袋およびその製造方法
JPS5799647A (en) 1980-12-11 1982-06-21 Mitsubishi Chem Ind Ltd Photosensitive lithographic printing plate material

Also Published As

Publication number Publication date
EP0113521A2 (de) 1984-07-18
DE3380667D1 (en) 1989-11-09
JPS5997146A (ja) 1984-06-04
EP0113521A3 (en) 1986-08-20
JPS6261946B2 (de) 1987-12-24

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