US3016824A - Lithographic printing form and method of preparing the same - Google Patents

Lithographic printing form and method of preparing the same Download PDF

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Publication number
US3016824A
US3016824A US788383A US78838359A US3016824A US 3016824 A US3016824 A US 3016824A US 788383 A US788383 A US 788383A US 78838359 A US78838359 A US 78838359A US 3016824 A US3016824 A US 3016824A
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Prior art keywords
printing
face
foil
free
metal
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US788383A
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English (en)
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Ritzerfeld Wilhelm
Ritzerfeld Gerhard
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    • 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
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
    • B41N1/086—Printing plates or foils; Materials therefor metallic for lithographic printing laminated on a paper or plastic base
    • 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 method of preparing lithographic printing forms, particularly printing foils and to the thus made product.
  • the present invention is concerned with lithographic printing forms having a metallic printing face fromed for instance by an aluminum or zinc foil which may be adhered to a backing sheet such as a paper sheet.
  • Priming forms according to the present invention such as the above mentioned metallic printing foils may be used as lithographic printing foils for offset printing as well as for direct lithographic printing by applying printing patterns from the non-printing side of the foil with superpositioning of a fat carrier.
  • Lithographic printing foils up to now required roughening of the metallic printing face in order to make the same hydrophilic, i.e. in order to improve water acceptance.
  • Such roughening could be accomplished mechanically by brushing or grinding, or chemically by etching, as well as by electrolytic oxidation of the metal surface.
  • such roughening treatment had to be carried out prior to forming printing patterns on the printing foil, requiring an additional procedure in the manufacture of the printing foil and thus increasing the costs.
  • the present invention includes in a method of preparing lithographic printing forms, the steps of forming on a smooth face of a metal body a printing pattern consisting of a fataccepting hydrophobic substance, leaving portions of the metal face free, and applying to the free portions of the face an organic hydrophilic colloid and a finely dispersed hydroxide of an alkaline earth metal, whereby the hydrophilic properties of the free portions of the metallic printing face are improved.
  • the present method of preparing a lithographic printing foil may include the steps of forming on a free smooth face of a metal foil consisting essentially of a metal selected from the group consisting of zinc, aluminum and alloys of the same, a printing pattern consisting of a layer of a fatty substance covering portions only of the free face of the metal foil, applying to the free face an aqueous liquid having suspended therein finely dispersed calcium hydroxide, the aqueous liquid being repelled by the fatty substance covered portions of the metal foil face while adhering to the remainder of the face, substantially evaporating the aqueous liquid so as to substantially cover the remainder of the face with a deposit of the calcium hydroxide, thereafter applying to the face an aqueous solution of gum arabic, the aqueous solution being repelled by the fatty substance covered portions of the metal foil face while adhering to the calcium hydroxide covered portions thereof, and evaporating the aqueous solution so as to form on the remainder of the face a deposit consisting
  • the present invention also contemplates a lithographic printing form including a smooth metallic printing face covered in part only by a printing pattern consisting of a fat-accepting hydrophobic substance, the remainder of the metallic printing face being substantially covered by an intimate mixture of an organic hydrophilic colloid and of a finely dispersed hydroxide of an alkaline earth metal, whereby the remainder of the metallic printing face is endowed with hydrophilic qualities.
  • the present invention contemplates a lithographic printing form, comprising in combination, a carrier sheet having opposite faces; and aluminum printing foil having a printing face covered in part only by a printing pattern consisting of a fat-accepting hydrophobic substance, the remainder of the metallic printing face being substantially completely covered with an intimate mixture of gum arabic and of finely dispersed calcium hydroxide, whereby the re mainder of the aluminum printing is endowed with hydrophilic qualities, and a layer hardened water resistant adhesive material interposed between the carrier and the aluminum printing foil firmly adhering the other face of the aluminum printing foil to one face of the carrier sheet.
  • metallic printing foils are used for preparing lithographic printing forms, which foils need not be roughened by mechanical, chemical, electrolytical or any other means.
  • a smooth metallic printing surface is provided, for instance a smooth rolled metal foil alone or fixed to a carrier sheet, and after forming a printing pattern of fat-accepting material on the smooth metallic printing surface, the same is treated with a solution of a natural or synthetic hydrophilic organic colloid, and with a suspension of finely dispersed calcium hydroxide or of another alkaline earth metal hydroxide.
  • the hydroxide suspension is formed in the aqueous colloid solution, or vice versa, so that colloid and suspension may be simultaneously applied to the printing foil.
  • aqueous suspension for instance, of calcium hydroxide and, either immediately thereafter or after air drying of the calcium hydroxide suspension on the printing foil, to apply the colloid solution.
  • the prepared printing foil ready for use comprises a metal foil 1, for instance an aluminum foil, however zinc foils and foils of certain alloys of aluminum and of zinc may also be used advantageously.
  • the hard aluminum foil has been rolled so as to possess a smooth surface, and preferably has a thickness of between 0.01 and 0.04 mm.
  • Aluminum foil 1 is adhered to paper carrier sheet 3 by means of an interposed thermoplastic or lacquer-like layer 2 of preferably waterresistant adhesive material.
  • Carrier sheet 3 preferably consists of a paper sheet weighing between 50 and 80 grams per square meter.
  • printing patterns 4 of fatty or fat-accepting hydrophobic material are formed on the free face of metal foil 1.
  • the portions of the free face of metal foil 1 which are not covered by printing patterns 4, are covered with a deposit of a mixture of a hydrophilic organic colloid such as gum arabic and of a finely dispersed hydroxide of an alkaline earth metal.
  • the above described deposit is indicated in the drawing by reference numeral 5.
  • at least part of the calcium hydroxide or the like might be transformed into a carbonate of an alkaline earth metal.
  • such carbonate is destroyed prior to use of the printing form by applying a dilute aqueous acid, for instance a 0.5% aqueous solution of phosphoric acid, to the printing surface.
  • the surface of the smoothly rolled metallic printing foils possess particularly good acceptance for the fatty material of the printing pattern, and that due to the undisturbed smoothness of the metallic printing surface extremely sharp reproduction of the printing pattern can be accomplished.
  • the smoothly rolled metal surface does not possess hydrophilic qualities, in other words, the wateracceptance of the portions of the metal surface which are not covered with the hydrophobic printing pattern, is poor.
  • This is overcome, according to the present invention, by applying calcium hydroxide or the like and an organic hydrophilic colloid in an aqueous carrier to the printing foil after the hydrophobic printing pattern has been formed thereon.
  • the aqueous liquid will not adhere to the portions of the printing form which are covered by the printing pattern, but a sufficient quantity of the aqueous liquid will adhere to the smooth free metal surface portions, so that upon drying, a substantially continuous deposit of for instance calcium hydroxide and gum arabic will be formed on the free portions of the metal surface.
  • the thus formed deposit will endow the portions of the printing foil surface which are not covered with the fatty printing pattern, with excellent hydrophilic, i.e. wateraccepting qualities.
  • the carbon dioxide content of the air causes partial transformation of the hydroxide into a carbonate.
  • a diluted aqueous acid such as a 0.5% aqueous phosphoric acid. Short treatment with the dilute acid will suffice to destroy the calcium carbonate or the like.
  • the present invention is not limited to the use of the same.
  • EXAMPLE 3 Composition of treating liquid C Gum arabic 20 Water 10% suspension of calcium hydroxide in water 50
  • EXAMPLE 4 Composition of treating liquid D Gum arabic 20 Calcium hydroxide 5 Water
  • the calcium hydroxide content of treating liquids such as are described in Examples 3 and 4 will be kept to between 2 g. and 15 g. per g. of treating liquid, and the gum arabic content to between 10 and 30 g.
  • Gum arabic may be replaced by other synthetic or natural organic colloids, such as polyvinyl alcohol, methyl cellulose, cellulose glycolate, starch or dextrine.
  • the present invention it is possible, according to the present invention, to apply either one treating liquid containing the colloids and also the hydroxide, or, for in stance, the calcium hydroxide dispersion of Example 3 may be first applied and subsequently the aqueous solution of gum arabic described in the same example.
  • EXAMPLE 5 Composition of treating liquid E G. Tylose Str 25 (methyl cellulose) 5 Distilled water 185 Calcium hydroxide 10
  • EXAMPLE 6 Composition of treating liquid F Tylose KZ (cellulose glycolate) 10 Distilled water Calcium hydroxide 10
  • the process according to the present invention may be carried out, for instance, in the following manner:
  • the printing foil is treated by pouring over the same a few cubic centimeters of the treating liquid described in Example 3.
  • the liquid is evenly distributed over the printing surface of the foil, for instance by means of a viscose sponge. Excess of the liquid is removed by applying the sponge which previously has been compressed so as to removeliquid from the same.
  • the foil is then wiped With a clean linen cloth whereby care must be taken not to exert too much pressure upon the printing surface. Thereafter, the foil is air dried, for instance by waving it by hand.
  • the foil After fastening the thus treated lithographic printing foil to a direct printing machine, the foil is wiped with a 0.5% aqueous phosphoric acid solution. Thereafter, the cylinder of the printing machine is allowed to turn a few times for moistening only, and then printing is carried out in conventional manner.
  • the foil After completion of the print run, the foil is stored Without special preservation of the same.
  • the printing foil is to be used for printing further copies, even after the lapse of a considerable length of time, it is sufiicient to moisten the foil for a short period of time for instance with moistened cotton wool, whereupon conventional printing can be resumed.
  • a method of preparing lithographic printing forms the steps of forming on a smooth face of a metal body a printing pattern consisting of a fat-accepting hydrophobic substance, leaving portions of said metal face free; and applying to said smooth face an aqueous liquid containing an organic hydrophilic colloid and a finely dispersed substance selected from the group consisting of the hydroxides of barium, strontium and calcium, whereby the hydrophilic properties of said free portions of said metallic printing face are improved.
  • a method of preparing lithographic printing forms the steps of forming on a smooth face of a metal body consisting essentially of a metal selected from the group consisting of Zinc, aluminum and alloys of the same, a printing pattern consisting of a fat-accepting hydrophobic substance, leaving portions of said metal face free; and applying to said smooth face an aqueous liquid containing an organic hydrophilic colloid selected from the group consisting of gum arabic, polyvinyl alcohol, methyl cellulose, cellulose glycolate, starch and dextrine, and also containing a finely dispersed substance selected from the group consisting of the hydroxides of barium, strontium and calcium, whereby the hydrophilic properties of said free portions of said metallic printing face are improved.
  • an organic hydrophilic colloid selected from the group consisting of gum arabic, polyvinyl alcohol, methyl cellulose, cellulose glycolate, starch and dextrine, and also containing a finely dispersed substance selected from the group consisting of the hydroxides of
  • a method of preparing a lithographic printing foil the steps of forming on a free smooth face of a metal foil a printing pattern consisting of a fat-accepting hydrophobic substance, leaving portions of said metal foil free; applying to said free face an aqueous liquid containing an organic hydrophilic colloid and a finely dispersed substance selected from the group consisting of the hydroxides of barium, strontium and calcium so as to form on said free portions of said face a deposit consisting essentially of an intimate mixture of said hydrophilic colloid and of said substance; and treating said deposit on said free portions of said printing foil face prior to use of said printing foil with an acidic aqueous solution, whereby the hydrophilic properties of said free portions of said metallic printing face are improved.
  • a method of preparing a lithographic printing foil the steps of forming on a free smooth face of a metal foil consisting essentially of a metal selected from the group consisting of zinc, aluminum and alloys of the same, a printing pattern consisting of a layer of a fatty substance covering portions only of said free face of said metal foil; applying to said free face an aqueous liquid containing an organic hydrophilic colloid and a finely dispersed substance selected from the group consisting of the hydroxides of barium, strontium and calcium, said aqueous liquid being repelled by said fatty substance covered portions of said metal foil face and being accepted by the remainder of said metal foil face so as to adhere thereto; and allowing said aqueous liquid on said metal face to dry so as to form thereon a layer consisting essentially of a mixture of said hydrophilic colloid and said substance.
  • a method of preparing a lithographic printing foil the steps of forming on a free smooth face of a metal foil consisting essentially of a metal selected from the group consisting of zinc, aluminum and alloys of the same, a printing pattern consisting of a layer of a fatty substance covering portions only of said free face of said metal foil; applying to said free face an aqueous liquid containing colloidal gum arabic and finely dispersed calcium hydroxide and evaporating said aqueous liquid.
  • a method of preparing a lithographic printing foil the steps of forming on a free smooth face of a metal foil consisting essentially of a metal selected from the group consisting of zinc, aluminum and alloys of the same, a printing pattern consisting of a layer of fatty substance covering portions only of said free face of said metal foil; applying to said free face an aqueous liquid containing colloidal gum arabic and finely dispersed calcium hydroxide, said aqueous liquid being repelled by said fatty substance covered portions of said metal foil face While adhering to the free portions thereof; evaporating said aqueous solution so as to form on said free portions of said face a deposit consisting essentially of a mixture of said calcium hydroxide and said gum arabic; and treating at least the deposit covered portions of said metallic printing foil face prior to use thereof with a dilute solution of phosphoric acid.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
US788383A 1958-01-24 1959-01-22 Lithographic printing form and method of preparing the same Expired - Lifetime US3016824A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DER22552A DE1116687B (de) 1958-01-24 1958-01-24 Verfahren zur Erzeugung von lithographischen Druckformen
DER0023246 1958-04-26

Publications (1)

Publication Number Publication Date
US3016824A true US3016824A (en) 1962-01-16

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US788383A Expired - Lifetime US3016824A (en) 1958-01-24 1959-01-22 Lithographic printing form and method of preparing the same

Country Status (5)

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US (1) US3016824A (de)
CH (1) CH367521A (de)
DE (1) DE1116687B (de)
FR (1) FR1214536A (de)
GB (1) GB876160A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229628A (en) * 1964-05-22 1966-01-18 Donnelley & Sons Co Printing plate and method of making the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2855170A1 (de) * 1978-12-20 1980-06-26 Schmalbach Lubeca Verfahren zum hydrophilieren von metalloberflaechen und/oder metalloxidoberflaechen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1759956A (en) * 1929-01-19 1930-05-27 Lithographic Technical Foundat Planographic printing surface
US2046959A (en) * 1935-07-26 1936-07-07 John V Mehl Art of printing
US2186945A (en) * 1937-06-16 1940-01-16 Harris Seybold Potter Co Preparing lithographic plates for printing
US2225746A (en) * 1940-05-24 1940-12-24 Kestenman Bros Mfg Co Linkage
US2311047A (en) * 1940-12-06 1943-02-16 William T Hagelin Lithographic plate and process of making the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE464051C (de) * 1927-07-09 1928-08-04 Fritz Tutzschke Verfahren zur UEberfuehrung von Platten aus Aluminium oder Aluminiumlegierungen, Zink oder Zinklegierungen sowie aus Kupfer in den lithographischen Zustand
DE504686C (de) * 1927-10-08 1930-08-06 Fritz Tutzschke Verfahren zur Herstellung lithographischer Druckformen mit tiefer als die Oberflaeche der wasseranziehenden Teile liegender Oberflaeche der farbanziehenden Teile
CH218657A (de) * 1938-08-09 1941-12-31 Horn Josef Verfahren zur Herstellung von Druckformen aus Leichtmetall, bei denen die bildfreien Stellen die Farbe abstossen.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1759956A (en) * 1929-01-19 1930-05-27 Lithographic Technical Foundat Planographic printing surface
US2046959A (en) * 1935-07-26 1936-07-07 John V Mehl Art of printing
US2186945A (en) * 1937-06-16 1940-01-16 Harris Seybold Potter Co Preparing lithographic plates for printing
US2225746A (en) * 1940-05-24 1940-12-24 Kestenman Bros Mfg Co Linkage
US2311047A (en) * 1940-12-06 1943-02-16 William T Hagelin Lithographic plate and process of making the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229628A (en) * 1964-05-22 1966-01-18 Donnelley & Sons Co Printing plate and method of making the same

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Publication number Publication date
FR1214536A (fr) 1960-04-08
DE1116687B (de) 1961-11-09
GB876160A (en) 1961-08-30
CH367521A (de) 1963-02-28

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