US3741835A - Method of preparing copper-plate printing plates for printing - Google Patents

Method of preparing copper-plate printing plates for printing Download PDF

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Publication number
US3741835A
US3741835A US00033853A US3741835DA US3741835A US 3741835 A US3741835 A US 3741835A US 00033853 A US00033853 A US 00033853A US 3741835D A US3741835D A US 3741835DA US 3741835 A US3741835 A US 3741835A
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US
United States
Prior art keywords
printing
ink
layer
plate
engraved
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
US00033853A
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English (en)
Inventor
G Giori
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.)
KBA Notasys SA
Original Assignee
De la Rue Giori SA
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 De la Rue Giori SA filed Critical De la Rue Giori SA
Application granted granted Critical
Publication of US3741835A publication Critical patent/US3741835A/en
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Classifications

    • 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
    • B41N1/10—Printing plates or foils; Materials therefor metallic for lithographic printing multiple
    • 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
    • B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio printing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S205/00—Electrolysis: processes, compositions used therein, and methods of preparing the compositions
    • Y10S205/921—Electrolytic coating of printing member, other than selected area coating

Definitions

  • the present invention relates to processes for the preparation of copper-plate printing plates the engraved lines of which retain ink and the surface of which apart from the lines repels ink and retains a wetting agent.
  • Such printing plates can be used in a copper-plate printing machine which works without wiping devices which have been used up to the present time.
  • a device for applying wetting agent to the plate is situated before the conventional inking device. This wetting agent covering the surface of the plate apart from the engraved lines prevents the surface of the said plate from being inked, in such a way that during its passage by the inking device, the ink is only applied to the engraved lines.
  • the present invention concerns a process in which it is possible to eliminate filling the engraved lines with a filling material.
  • a method for preparing a printing plate for printing comprising providing an engraved printing plate having a surface in ink retaining material, applying a layer of a second material repellent to ink but accepting a wetting agent on said surface, and removing said layer from the engraved part of said surface.
  • the surface of the printing plate excluding the engraved part is preferably coated with a protective coating which is removed after the removal of the second material.
  • the second material is preferably matt chromium and is removed from the engraved part by chemical or electrolytic means, the potective layer not being affected by this treatment.
  • the protective layer is held by means of a coating of glue previously applied to the surface of the non engraved part of the printing plate, this coating of glue conveniently consisting of a conventional printing ink applied by means of an inking cylinder.
  • the protective layer, cosisting of powdered bitumen is next 3,741,835 Patented June 26, 1973 applied to the damp coating of ink, fused by the application of heat and, after the removal of the second material from theengraved part, the protective layer and the ink are removed from the surface of the printing plate.
  • the plate is treated with an electrolytic aqueous solution containing ions which penetrate, for example by capillary action into the porous structure of the second material.
  • the outer layer forming the nonprinting surface preferably of matt chrome, is additionally impregnated with constituents capable of retaining the wetting agent and repelling ink.
  • the printing plate is indicated by the general reference numeral 1.
  • a layer 16 of chromium which has ink-repellent properties when covered by a wet film.
  • This chromium layer can be deposited by chemical or electrolytic means.
  • the non-printing surface of plate 14, i.e. the part not provided with engraved lines, is covered with a protective coating which is not affected by the later treatment for removal of the chromium layer 16 from the lines.
  • a protective coating which is not affected by the later treatment for removal of the chromium layer 16 from the lines.
  • the surface of the plate not having engraved line-s 15 is covered with an adhesive layer 25, composed of a conventional printing ink or another similar material, by means of an inking cylinder. Care should be taken to prevent the ink from entering the lines 15.
  • the so-called protective coating 26 is spread in powder form. Bitumen is preferably used for this purpose. The excess bitumen or other material used is shaken ofi and/or removed by compressed air, the powder being particularly carefully removed from the engraved lines.
  • the powder By suitable heating of the plate or only the surface thereof, the powder is brought to its fusion point so that it forms a solid bituminous layer 26. Simultaneously, the adhesive coating is dried in such a way that the protective coating only adheres to the surface of the plate where it is not provided with lines 15.
  • This protective coating is then capable of resisting a caustic or electrolytic treatment for removing the deposit of chromium 16 from the lines. During this treatment it is advantageous to ensure that all the chrome is removed but that the under-lying copper is not affected.
  • the next step consists of removing the protective coating from the surface of the plate.
  • the bitumen is firstly removed by treatment with naphtha or naphthalene, for example, after which the underlying coating of ink or adhesive 25 is dissolved by means of a suitable solvent such as phenol.
  • the protective coating can also be removed by means of trichlorethylene.
  • the finished printing plate is thus covered with a layer of chromium 16, which repels ink but retains the wetting agent, on the non-printing surface thereof which does not have any engraved lines, whilst the engraved lines are in copper which is an ink retaining material.
  • the plate be treated after the chromium deposit with an electrolytic aqueous solution, preferably brought to a temperature of between 50 C. and C., and which contains ions which penetrate the porous structure of the chromium especially by capillary action, and which increase the desired property of retaining a wetting agent.
  • an electrolytic aqueous solution preferably brought to a temperature of between 50 C. and C., and which contains ions which penetrate the porous structure of the chromium especially by capillary action, and which increase the desired property of retaining a wetting agent.
  • the chromium is additionally impregnated with constituents capable of retaining a wetting agent and repelling ink and which are attached to the chromium by chemical reaction.
  • a wetting agent the composition of which is similar to that which is applied during printing for wetting the surface of the plate: such agents are known, for example, in offset printing methods.
  • This electrolytic solution may be al kaline and contain phosphates, for example.
  • the plate itself As the mechanical resistance of copper used for these printing plates is low, the plate itself, designated by 14, is made of nickel, engraved with lines, on which a layer of copper is applied, for example by condensation in a vacuum before carrying out the above-described process. A copper layer 0.0025 mm. thick is sufficient.
  • the treatment of the plate is carried out as described hereinabove. After removal of the chromium 16 from the engraved lines, the underlying layer of copper, which is not affected by the treatment, forms an ink-retaining surface.
  • the invention is not limited to the described embodiment.
  • this can be any substance which has these properties and which can be deposited on the printing plate.
  • the protective layer can also consist of any suitable material which resists the treatments for the removal of the ink-repellent material from the engraved lines. This latter treatment can be carried out by any known mechanical, chemical or electrolytic method or even an electrical process such as electro-erosion, or by a combination of such methods.
  • An improved method for preparing an engraved copper faced printing plate which comprises:
  • step (b) a printing ink is applied to the non-engraved surface already coated with chromium and powdered bitumen is applied over the printing ink, the ink and bitumen fused and in step ((1) this coating of fused ink and bitumen is removed by treatment with a first solvent to remove the bitumen and a second solvent to remove the printing ink.
  • electrolytic solution contains an adhesive selected from the group consisting of gelatin or gum arabic.

Landscapes

  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)
US00033853A 1969-05-08 1970-05-01 Method of preparing copper-plate printing plates for printing Expired - Lifetime US3741835A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH707369A CH486995A (de) 1969-05-08 1969-05-08 Verfahren zur Herstellung einer Stahlstichdruckplatte

Publications (1)

Publication Number Publication Date
US3741835A true US3741835A (en) 1973-06-26

Family

ID=4319496

Family Applications (1)

Application Number Title Priority Date Filing Date
US00033853A Expired - Lifetime US3741835A (en) 1969-05-08 1970-05-01 Method of preparing copper-plate printing plates for printing

Country Status (6)

Country Link
US (1) US3741835A (https=)
AT (1) AT304586B (https=)
CH (1) CH486995A (https=)
FR (1) FR2046194A5 (https=)
GB (1) GB1303853A (https=)
SE (1) SE353858B (https=)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960675A (en) * 1975-04-17 1976-06-01 Motter Printing Press Co. Method for deplating and replating rotogravure cylinders
US4267028A (en) * 1977-01-28 1981-05-12 Daniel Beaune Process for smooth cut printing
US4891302A (en) * 1987-05-06 1990-01-02 Gordon Douglas C Method of preparing a contoured plate
WO2003049945A1 (fr) * 2001-12-10 2003-06-19 Mikhail Abramovich Esterzon Procede de formation d'un dessin dans la couche fonctionnelle d'un article
RU2299813C2 (ru) * 2001-12-10 2007-05-27 Общество С Ограниченной Ответственностью "Инсмат Технология" Способ получения рельефа в функциональном слое печатной формы

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4729310A (en) * 1982-08-09 1988-03-08 Milliken Research Corporation Printing method
US4718340A (en) * 1982-08-09 1988-01-12 Milliken Research Corporation Printing method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960675A (en) * 1975-04-17 1976-06-01 Motter Printing Press Co. Method for deplating and replating rotogravure cylinders
US4267028A (en) * 1977-01-28 1981-05-12 Daniel Beaune Process for smooth cut printing
US4891302A (en) * 1987-05-06 1990-01-02 Gordon Douglas C Method of preparing a contoured plate
WO2003049945A1 (fr) * 2001-12-10 2003-06-19 Mikhail Abramovich Esterzon Procede de formation d'un dessin dans la couche fonctionnelle d'un article
RU2299813C2 (ru) * 2001-12-10 2007-05-27 Общество С Ограниченной Ответственностью "Инсмат Технология" Способ получения рельефа в функциональном слое печатной формы

Also Published As

Publication number Publication date
CH486995A (de) 1970-03-15
GB1303853A (https=) 1973-01-24
AT304586B (de) 1973-01-10
FR2046194A5 (https=) 1971-03-05
SE353858B (https=) 1973-02-19

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