US2097831A - Surface printing plate, more particularly offset-printing plate and the process for printing therewith - Google Patents

Surface printing plate, more particularly offset-printing plate and the process for printing therewith Download PDF

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Publication number
US2097831A
US2097831A US4191A US419135A US2097831A US 2097831 A US2097831 A US 2097831A US 4191 A US4191 A US 4191A US 419135 A US419135 A US 419135A US 2097831 A US2097831 A US 2097831A
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US
United States
Prior art keywords
printing
layer
printing plate
plate
ink
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
US4191A
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English (en)
Inventor
Boekelman Willem Anthonius
Elfers Alberthus
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Individual
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Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2097831A publication Critical patent/US2097831A/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
    • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing

Definitions

  • the invention relates to a surface printing plate, more particularly an offset printing plate and to a process for printing therewith.-
  • the object of the invention is to manufacture in a simple manner an offset printing plate suitable for obtaining better prints in editions comprising a large number of copies in which the design elements are etched on the plate to the right tone values.
  • a zinc or aluminium plate grained and provided with a light-sensitive albumen or gelatine layer is taken as a starting material. After the copy has been formed on the same, the plate is powdered, treated with Strecker salt and then washedwith water.
  • a fixing dye or permanenting agent is then applied to the plate by means of a roller, the plate is dried once more and dusted with talcum powder, after which the plate is again treated with Strecker salt and-washed with turpentine.
  • the desired printing ink may be applied to the plate by means of a roller or otherwise and printing'may be started as a controlling means and in order to find out whether the printing 30 elements are good.
  • the said treatments gener ally are repeated.
  • the quality of the printing plate depends on the degree of accuracy in retouching; however, it is possible to see whether the retouching has been correctly done only by making the proofs.
  • the said skin layer has a thickness of 0.01 millimetre at the utmost and preferably not more than 0.005 millimetre.
  • the ink attracting surface may consist of a metal deposit obtained by electro-plating and etching through onto an un-grained surface.
  • the water attracting sists in depositing by means of electroplating on a hard carrier of copper or some other material an intermediate layer of lead or a lead alloy or some other material and in depositing by means of electro-plating on the said intermediate layer a skin-thin upper layer of copper or some other metal, which latter layer is etched through by means of an etching agent against which the-v intermediate layer is proof.
  • the skin-thin metal design elements are more lasting than the elements which have been hitherto used, and may be readily cleaned without detriment by means of a brush.
  • the design elements are no longer attacked by the printing ink, and the ink is readily removed from the smooth metal surface with a little turpentine before the plate is used for the next operation period.
  • the novel plate has great mechanical resistance, the design is exceptionally sharply defined and it is always possible to carry out retouching even after printing proofs are already made, as well as in any other stage.
  • the invention moreover offers the possibility of obtaining an offset printing plate which may be etched to the right tone value with all the associated advantages.
  • the plate may be treated with turpentine or gasoline and sulphuric acid or phosphoric acid or other means.
  • a point or some other design element may be etched thinner (reduced in diameter or width) according to the right tone value on the printing plate itself.
  • the etch-proof intermediate or basic layer only admits of the etching influencing the size (diameter or width) of a point, whereas its depth is not influenced at all, so that it is possible to obtain "a needle-sharp etching of the grating point or line.
  • the skin-like upper layer has a thickness of 0.005 millimetre only, the basis of an extremely fine point or of a very thin line always is of much greater dimensions than its height.
  • a layer of printing ink or some other etch-proof material may be applied for correction.
  • any retouching work may be carried out at any time, without the necessity of repeating the treatment from the starting point.
  • the printing plate according to the invention will readily take a good amount of ink and will give off the same quickly and readily to the rubber surface, so that the machine may operate at top speed and the production may be increased. With an equal thickness of the layer of ink supplied the printing plate will give off much more ink to the rubber cylinder than was hitherto possible, which results in a very true printed design without the necessity of overloading the plate with ink.
  • a copper or iron plate may serve as a carrier for the whole, this plate having the advantage over zinc that it is less liable to stretch.
  • the term smooth is intended to refer to an ungrained surface.
  • l is a carrier made of copper or some other material, on which is deposited a layer 2 of lead, a lead alloy, or some other suitable material having a thickness of approximately 0.03-0.05 mm. On this layer is deposited a copper layer having a thickness of 0.005-0.01 mm. on which an image is formed. This image after being developed, fixed and washed, is used 'for the purpose of etching entirely through the copper onto the layer of lead, e. g. by means of ferric chloride, for the formation of design points 3, 4, 5.
  • a printing plate for offset printing comprising a metallic layer and metallic ink-receptive design elements carried by said layer, said layer having a naturally water-receptive surface to provide an ink-repelling surface, the said metal of the layer at the same time being proof against an etching agent with which the metal of the design elements can be removed.
  • a printing plate for offset printing comprising a carrier layer and a deposit of metallic mam ink-receptive design elements on said layer.
  • said layer being of a metal having a naturally waterreceptive surface to provide an ink-repelling surface, the said metal at the same time being proof 5 against an etching agent with which the metal of the design elements can be removed.
  • a printing plate for offset printing according to claim 2 in which the metal layer providing the water-receptive ink-repelling surface consists of the naturally water-retaining surface of lead. 6. A printing plate for offset printing according to claim 2, in which the metal layer providing the water-receptive ink-repelling surface consists of the naturally water-retaining surface of a lead alloy. 25 7. A printing plate for oflset printing according to claim 1, in which the water-receptive surface is smooth and unprepared.
  • Method of printing from a printing form for offset printing having a closed surface of lead bearing a metal ink-receptive design comprising thefstep of applying water directly to the closed surface of lead.
  • Method of printing from a printing form for offset printing having a closed smooth surface of lead bearing a metal ink-receptive design comprising the step of applying water directly to the closed smooth surface of lead.
  • Method of printing from a printing form for offset printing having a closed smooth surface of a lead alloy bearing a metal ink-receptive design comprising the step of applying water directly to the closed smooth surface of a lead alloy.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
US4191A 1934-02-15 1935-01-30 Surface printing plate, more particularly offset-printing plate and the process for printing therewith Expired - Lifetime US2097831A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL68460 1934-02-15
NL68459 1934-02-15

Publications (1)

Publication Number Publication Date
US2097831A true US2097831A (en) 1937-11-02

Family

ID=26641547

Family Applications (1)

Application Number Title Priority Date Filing Date
US4191A Expired - Lifetime US2097831A (en) 1934-02-15 1935-01-30 Surface printing plate, more particularly offset-printing plate and the process for printing therewith

Country Status (7)

Country Link
US (1) US2097831A (enMihai)
BE (2) BE407830A (enMihai)
DE (2) DE762662C (enMihai)
ES (1) ES137228A1 (enMihai)
FR (2) FR785316A (enMihai)
GB (2) GB446775A (enMihai)
NL (2) NL37704C (enMihai)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE142406C (enMihai) *
US758599A (en) * 1897-02-23 1904-04-26 Aluminum Compound Plate Company Printing-plate.
US1069856A (en) * 1912-12-31 1913-08-12 American Planograph Company Printing-plate.

Also Published As

Publication number Publication date
FR785344A (fr) 1935-08-07
ES137228A1 (es) 1935-06-01
BE407830A (enMihai)
NL37703C (enMihai)
FR785316A (fr) 1935-08-07
GB446777A (en) 1936-05-06
NL37704C (enMihai)
DE644508C (de) 1937-05-05
GB446775A (en) 1936-05-06
DE762662C (de) 1952-07-07
BE407829A (enMihai)

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