EP0293596B1 - Fluide pour la correction et procédé pour le traitement des égratignures sur plaques lithographiques - Google Patents

Fluide pour la correction et procédé pour le traitement des égratignures sur plaques lithographiques Download PDF

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Publication number
EP0293596B1
EP0293596B1 EP88106639A EP88106639A EP0293596B1 EP 0293596 B1 EP0293596 B1 EP 0293596B1 EP 88106639 A EP88106639 A EP 88106639A EP 88106639 A EP88106639 A EP 88106639A EP 0293596 B1 EP0293596 B1 EP 0293596B1
Authority
EP
European Patent Office
Prior art keywords
scratches
composition according
component
printing plates
treated
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
Application number
EP88106639A
Other languages
German (de)
English (en)
Other versions
EP0293596A3 (en
EP0293596A2 (fr
Inventor
Thomas Nicolas Gillich
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.)
CNA Holdings LLC
Original Assignee
Hoechst Celanese Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hoechst Celanese Corp filed Critical Hoechst Celanese Corp
Publication of EP0293596A2 publication Critical patent/EP0293596A2/fr
Publication of EP0293596A3 publication Critical patent/EP0293596A3/de
Application granted granted Critical
Publication of EP0293596B1 publication Critical patent/EP0293596B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/34—Derivatives of acids of phosphorus
    • C11D1/345—Phosphates or phosphites
    • 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 invention relates to a mixture and a method for the surface correction of a planographic printing plate with a metal carrier, preferably made of aluminum, which is scratched during handling.
  • the fact that water and fats naturally repel each other is used in the planographic printing system.
  • the surface of a planographic printing plate consists of areas that accept water and repel bold ink and those that repel water and accept bold ink.
  • the former areas form the non-image areas, the others the image areas. Therefore, if the surface properties are disturbed in these two areas, e.g. For example, if the hydrophilic non-image areas are scratched when working with the plate, the inks tend to settle in those scratched areas which have reduced hydrophilicity, which leads to toning of the background.
  • the scratches in the non-image areas fill with printing ink and gradually become oleophilic, so that "smearing" occurs.
  • a method for hydrophilizing a metal surface, in particular an aluminum surface is that the surface with an aqueous alkali silicate solution, e.g. B. a solution of sodium or potassium metasilicate, is treated.
  • an aqueous alkali silicate solution e.g. B. a solution of sodium or potassium metasilicate
  • smeared areas are cleaned and scratches and weak defects such as. B. superficial scratches, removed from illustrated and developed printing plates.
  • alkali silicates other alkaline salts of a strong base and a weak acid are also used in solutions such as e.g. B. is described in US-A 3,394,653.
  • US Pat. No. 4,028,281 describes a treatment solution for metal plates, which is composed of an alkali silicate, a surfactant and the iron chelate of ethylenediaminetetraacetic acid and is used as a solution for cleaning and removing scratches on imaged and developed planographic printing plates. With these solutions, the scratches are often only corrected after a longer exposure time or there are still slight background veils when printing.
  • the object of the present invention was therefore to develop a fast-acting correction fluid with a very good correction effect.
  • the above object is achieved by a mixture consisting of 0.25 to 10.0% trisodium, trilithium or tripotassium phosphate, 0.25 to 5.0% sodium metasilicate, 0.10 to 5.0% of an arylphenol ethoxylate as anionic Surfactant and 80.0 to 99.4% water.
  • the invention furthermore relates to a method for correcting scratches in the non-image areas of a planographic printing plate with a metal support, in which the scratch or scratches occur in an imagewise exposed and developed planographic printing plate with hydrophilic non-image areas and oleophilic image areas that have at least one scratch in a non-image area Mixture is applied, which consists of 0.25 to 10.0% trisodium, trilithium or tripotassium phosphate, 0.25 to 5.0% sodium metasilicate, 0.10 to 5.0% of an arylphenol ethoxylate as an anionic surfactant and 80.0 to There is 99.4% water.
  • the phosphate component is contained in the mixture in a proportion of preferably 0.5 to 5.0% and in particular 1.0 to 3.0%. In a particularly preferred embodiment, trisodium phosphate is used.
  • the sodium metasilicate content is preferably 0.5 to 3.0% and in particular 1.0 to 2.5%.
  • the anionic surfactant is an arylphenol alkoxylate and, in the preferred embodiment, a potassium salt of phosphated, alkoxylated arylphenol. This component reduces the surface tension and facilitates easier penetration of the other components into the surface to be corrected.
  • the surfactant content is preferably 0.2 to 3.0% and in particular 0.3 to 2.0%.
  • the water content is preferably 89.0 to 98.8% and in particular 92.5 to 97.7%. The percentages are based on the weight of the mixture.
  • Negative-working planographic printing plates (type N-250, manufacturer: Enco Printing Products Division of Hoechst Celanese Corporation) are used for the evaluation of the solution produced in this way.
  • the N-250 plate is exposed, developed and used in a sheet-fed press (Heidelberg SORK brand), delivering prints of acceptable quality.
  • the machine is stopped and the plate is scratched at four locations across the non-image areas. This is intended to simulate conditions that often occur when handling printing plates in the machine rooms. When printing on, it becomes apparent that the plate takes on ink at the scratched areas and also reproduces it on the printed sheet.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)

Claims (9)

  1. Composition liquide pour correction de rayures dans les zones de non image de plaques d'impression comportant un support métallique, en particulier en aluminium, constituée
    a) de 0,25 à 10,0 % de phosphate de trisodium, tripotassium ou trilithium,
    b) de 0,25 à 5,0 % de métasilicate de sodium,
    c) de 0,10 à 5,0 % d'un produit d'oxyéthylation d'un arylphénol,
    d) de 80,0 à 99,4 % d'eau.
  2. Composition selon la revendication 1, caractérisée en ce que le composant a) est le phosphate de trisodium.
  3. Composition selon l'une des revendications 1 ou 2, caractérisée en ce que le composant a) est présent en une quantité de 0,5 à 5,0 %.
  4. Composition selon l'une des revendications 1 à 3, caractérisée en ce que le composant b) est présent en une quantité de 0,5 à 5,0 %.
  5. Composition selon l'une des revendications 1 à 4, caractérisée en ce que le composant c) est un sel potassique d'un arylphénol alcoxylé phosphaté.
  6. Composition selon l'une des revendications 1 à 5, caractérisée en ce que le composant c) est présent en une quantité de 0,2 à 3,0 %.
  7. Composition selon l'une des revendications 1 à 6, caractérisée en ce que le composant d) est présent en une quantité de 89,0 à 98,8 %.
  8. Procédé pour la correction de rayures dans les zones de non image de plaques d'impression à supports métalliques, caractérisé en ce que l'on traite par une composition liquide selon les revendications 1 à 7 la plaque développée, présentant des rayures dans les zones de non image.
  9. Procédé selon la revendication 8, caractérisé en ce que, avant le traitement par la composition liquide, on traite la plaque par une solution de nettoyage connue en soi.
EP88106639A 1987-06-01 1988-04-26 Fluide pour la correction et procédé pour le traitement des égratignures sur plaques lithographiques Expired - Lifetime EP0293596B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US56180 1987-06-01
US07/056,180 US4778616A (en) 1987-06-01 1987-06-01 Scratch corrector for lithographic printing plates

Publications (3)

Publication Number Publication Date
EP0293596A2 EP0293596A2 (fr) 1988-12-07
EP0293596A3 EP0293596A3 (en) 1989-03-15
EP0293596B1 true EP0293596B1 (fr) 1991-11-06

Family

ID=22002704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106639A Expired - Lifetime EP0293596B1 (fr) 1987-06-01 1988-04-26 Fluide pour la correction et procédé pour le traitement des égratignures sur plaques lithographiques

Country Status (4)

Country Link
US (1) US4778616A (fr)
EP (1) EP0293596B1 (fr)
JP (1) JPS63312193A (fr)
DE (1) DE3866028D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5342435A (en) * 1992-09-25 1994-08-30 Eastman Kodak Company Scratch remover and desensitizer composition for use with lithographic printing plates
US5965326A (en) * 1997-01-21 1999-10-12 Presstek, Inc. Method for selectively deleting undesired ink-receptive areas on wet lithographic printing constructions incorporating metallic inorganic layers
GB9710552D0 (en) * 1997-05-23 1997-07-16 Horsell Graphic Ind Ltd Planographic printing

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394653A (en) * 1965-10-12 1968-07-30 Robert E. Riesberg Novel method of cleaning paper planographic plates
US3462520A (en) * 1966-10-14 1969-08-19 Gaf Corp Phosphate esters of alkoxylated straight-chain primary alcohols
US3882038A (en) * 1968-06-07 1975-05-06 Union Carbide Corp Cleaner compositions
US3679479A (en) * 1970-01-07 1972-07-25 Eastman Kodak Co Washout-preservative for lithographic printing plates
US3887497A (en) * 1973-03-15 1975-06-03 George B Ulvild Liquid cleansing composition and method of producing
US4028281A (en) * 1975-12-08 1977-06-07 Scott Paper Company Metal plate treating solution
CA1090189A (fr) * 1976-05-03 1980-11-25 American Hoechst Corporation Produit de finissage des plaques lithographiques, comprenant un solvant et une phase aqueuse contenant de la dextrine extraite du tapioca
US4234443A (en) * 1978-03-24 1980-11-18 Michael A. Canale Composition and a method useful for making a fountain solution for lithographic printing operations
US4374920A (en) * 1981-07-27 1983-02-22 American Hoechst Corporation Positive developer containing non-ionic surfactants
US4664721A (en) * 1981-12-07 1987-05-12 Intercontinental Chemical Corporation Printing screen cleaning and reclaiming compositions
US4539134A (en) * 1982-12-02 1985-09-03 Halliburton Company Methods and cleaning compositions for removing organic materials from metallic surfaces
US4504406A (en) * 1983-02-22 1985-03-12 American Hoechst Corporation Cleansing agent for printing plates
JPS60147395A (ja) * 1984-01-12 1985-08-03 Fuji Photo Film Co Ltd 平版印刷版用版面洗浄剤

Also Published As

Publication number Publication date
US4778616A (en) 1988-10-18
EP0293596A3 (en) 1989-03-15
JPS63312193A (ja) 1988-12-20
EP0293596A2 (fr) 1988-12-07
DE3866028D1 (de) 1991-12-12

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