US2245276A - Method of producing stereotype printing forms electrolytically - Google Patents

Method of producing stereotype printing forms electrolytically Download PDF

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Publication number
US2245276A
US2245276A US181051A US18105137A US2245276A US 2245276 A US2245276 A US 2245276A US 181051 A US181051 A US 181051A US 18105137 A US18105137 A US 18105137A US 2245276 A US2245276 A US 2245276A
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United States
Prior art keywords
printing
resist
electrolytically
image
coat
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Expired - Lifetime
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US181051A
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English (en)
Inventor
Hugentobler Walter
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.)
Spectraldruck G M B H
SPECTRALDRUCK GmbH
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SPECTRALDRUCK GmbH
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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

Definitions

  • the method according to the invention comprises applying to a non-porous iron carrier, which has previously been accurately planed by. grinding, a layer of corrosion-proof electrolytically lling in the blank portions with y a layer of stereotype metal up to the' level of the coat of resist, removing the coat of resist.
  • stereotype printing forms are applicable with particular advantage for the printing in rotary printing presses, for which purpose it is, as is Well known, required that the diameter of the printing cylinders must remain accurately true to size, in that, if a stereotype printing surface is to be taken down, the electrolytically applied metal portions can be removed by simply reversing the poles of the bath to the effect that the 'circumference of the cylinder remains intact and the cylinders can be put to another use unaltered.
  • plane printing forms can Ibe used over and over again as well as cylindrical forms by removingthe image electrolytically, after the printing surface has been freed from color residues byV means of a solvent, so that removing the image I by means of an abrasive or b y grinding, for the purpose of using the form carrier again, can -be dispensed with.
  • the resistivity of the stereotype printing form against fatty acids which are principally used in connection with the printing colors employed for this purpose, can be increased by electrolytically applying a thin 'layer of chromium to the blank surface portions.
  • FIG. 1 is va side sectional view of an iron plate which fornisthe foundation of the printing form.
  • Fig. 2 is a. view similar to Fig. 1 with an'A elec trolytic plating of non-rusting and non-corrosive metal applied to its upper surface.
  • . 6 is a view similar .to 5 with the image surfaces, leaving the resist applied to the print,
  • Fig. 9 is a view simusr to Fig. s but with an.
  • Fig. 10 is a view similar to Fig. 9 but showing a thin electrolytic plating of chromium applied to the zinc surfaces. .I
  • Fig. 11 is a view similar to Fig. 10 with the resist removed from the printing surfaces.
  • Fig. 12 is a view similar to Fig. 11 ⁇ but with a coating of Syrian asphalt applied to the printing surfaces.
  • Fig. 13 is a view similar to Fig. 12 of the finished printing form with printing color applied to the image surfaces.
  • a first specific mode of procedure for carrying into eect the method of producing a flat stereotype printing form consists in the following: i
  • an iron plate i As a carrier an iron plate i is used which must be entirely devoid of porous portions and the surface of which is ground plane. 'I'his plate is plated electrolytically with a layer 2 of rust and corrosion resisting metal in order to facilitate the subsequent application of a layer of stereotype metal, that is, metals which are used for making stereotype plates, and are deposited electrolytically, for instance copper, zinc, lead, brass, antimony, nickel and chromium.
  • Two principal' .kinds of stereotype printing surfaces can be produced, namely, a printing surface the basic material of which consists of zinc and one the basic material of which consists of copper, these printing surfaces being provided with a covering layer.of antlmony, lead or the like.
  • the basic material of which consists of zinc the plating 2 of nickel (Fig. 2) is at first coated with a thin layer of copper to which a covering layer 3 of zinc is then applied electrolytically (Fig. 3).
  • the covering layer of zinc is prepared in a ⁇ manner as usual for receiving the reprint or the photographic reproduction of the image.
  • the surface portions adjoining the image portions of the st'ereotype printing form are thoroughly coated with gum 5, as in Fig. 5, and the image and its covering of gum are removed from the plate, as in Fig.
  • the coating of resist being indicated by a.
  • the blank surface portions that are not to be printed that is, the surface portions which adjoin the image portions and are not intended to be inked in during the printing operation are protected from this resist by the coat of gum, whereas the printing surface portions receive ythe resist and retain the same.
  • the gum is then dissolved by steaming or by wiping hot water-.across the same, so that the layer of gum applied to the blank ing the gum coated portions is removed with the same.
  • the printing surface portions remain covered with a protecting coat of resist l for example, turpentine. which does not aect the in a water bath another layer 5 of zinc is applied' electrolytically (Fig. 9), the thickness of this layer being such that the layer is flush with the coat of resist 5a.
  • the basic metal is laid bare (Fig. 11).
  • the metal surface is rubbed down with oil of cloves and a solution of Syrian asphalt in rectified turpentine is applied so as to form a coat sticking to metal at the bottom of the depression (Fig. 12).
  • the coat 1 of Syrian asphalt which corresponds to the printing image sticks permanently to the depressions without, however, filling them out for the full height, the thickness of the coat being predetermined by correspondingly proportioning the asphalt mixture.
  • the printing form is cleanly rinsed in order to free all the blank surfaces from asphalt residues which may have deposited on the gum coat.
  • 'I'hen a further coat of gum arabic is applied and printing ink. That is, black lithographers ink rich in coloring substance and poor in fat content, is rolled into said coating of gum. 'I'he deposits of printing ink on the surface of the gum costare then removed by means of steam or hot water, so that only the printing ink adhering to the coat of Syrian asphalt in the image portions is left. Subsequently, the blank surface portions are etched with zinc etch in order tol prevent them from attracting color during the printing operation. A new coat of gum is then applied thereto. Then the plate is washed oi! again for removing the printing ink, the washing liquid consisting of turpentine, sothat the asphalt is removed from the depressions also.
  • the printing color l fills the depressions above the color-receptive coat 1 of resist thus permitting to control the effect of the imprint, as desired, depending upon whether more or less ink is supplied into the depressions, it being even possible to provide an excess amount of ink. so that the ink rises above the edges of the depressions.
  • the surface of the cylindrical printingform is at first nickel-plated as mentioned above, whereupon a relatively thick layer of copper is de-A posited electrolytically. Then the surface of the printing forml is carefully cleaned by rinsing and covered with a thin coat of gum arabic, -in order to prevent oxidation. Preparatory to applying the printing image to the printing form or producing it thereon the surface of the printing form is rinsed with water, in this case also, to which gether with the resist adhering thereto above the blank surface portions, by means of steam or hot water. Then the surface of the printing form is carefully cleaned once more byvrinsing with water. until all impurities had been removed from the blank surface portions.
  • the surface of the printing form is washed with rectied turpentine which does not v affect the gum coat, so that the resist is dissolved and the basic copper material is laid bare at the bottom of the depression.
  • a. coat of a. solution of asphalt resist in rectified turpentine is applied, so that a uniform surface is obtained.
  • the printing form is washed with water, so that the gum coat and the overlying coat of asphalt are dissolved, whereas the printing surface portions of the image remain coveredby asphalt resist. After the blank surface portions have been completely freed from all residues of asphalt resist, thefsurface of the printing form whereas the printing surface portions are fatreceptive.
  • the surface of the printing form is again coated with gum and the layers of asphalt resist and printing ink are -washed off with turpentine across the gum. After rinsing, the surface ofV theprinting form is etched once more with a diluted mixture/of sulfuric and nitric acid andthen the stereotype printing form is fit for use.
  • the iron core is provided with a nickel-plating in the manner described in connection with the preceding mode of procedure, but in distinction therefrom, a layer of antimony and lead or an alloy of these metals is applied;
  • the printing image is then constituted by the entire .printing surface of the printing form, whereas the remaining surface portions consisting of lead or antimony are not color-receptive and are therefore not printed, due to having been etched by means of sulfuric and nitric acid.
  • the plate or cylinder is again coated with gum arabic, whereupon and is then etched by means of a diluted mixture of sulfuric and nitric acid.l
  • the lead or antimony is made water-receptive
  • the body of the printing form is immersed in the electrolytic bath in which the upper metal layer had been produced and is subjected to the action of the electrolyte for exactly the samelength of time as before, while the poles of the bath are reversed, so that the body of the printing form provides' the anpde, in.' consequence whereof the layer having previously been electrolytically applied, is removed again. in electrolytic manner. Then the fiat or circular printing form of accurately initial thichiess or circumferential length respectively is in condition for receiving a new image. In this way, on
  • the printing forms can be treated-without being damaged. This will be readily understood when it is observed that the plates used for making fiat printing forms can simply be transferred from one tray to the other by hand, while the cylindrical printing forms can be transferred from one vat to the other lof a series of collateral vats by means of a crane.
  • the layer to be applied can be kept down to so small a thickness that it has no tendency to crack.
  • This is of particular advantage, when it is intended to use the stereotype printing forms for offset printing in connection with which the printing forms are clamped to a cylinder.
  • n v7:is use it has been experienced that portions nl the exterior layer dropped off after the material had been damaged, so that the bare metal underneath wascovered with printing color, in consequence of which, the edge of the printingy sheet became blurred. 'I'his drawback is.completely eliminated according to this invention.
  • the method according to the invention is of particular advantage for the production of stereotype printing forms for rotary printing presses. Since cylindrical printing forms having a circumferentlally continuous printing surface, can be produced by meansl of this method with ease.
  • a coat of nickel is deposited electrolytically up to the full height of the coat of resist present, whereupon the body of the printing form is carefully cleaned by rinsing it with water, coated once more with gum, and the layer of asphalt resist is removed, in a manner known per se, so that the basic copper or brass material is exposed in the depressions.
  • the surface of the printing form is then washed with a solution of asphalt in rectiiied turpentine, this coat of asphalt forming at the bottom of the depressions a' color-receptive support the outlines of which are conform with those of the printing image.
  • haar AVAILABLE corr changing the succession of operations, in such manner, that first a layer of nickel is deposited on the printing surface which layer is subjected to the treatment described and to' which the image ls applied, whereupon a second layer of copper or brass is electrolytically deposited. If then the etching is carried out in a similar manner, the entire surface of the printing form is rendered color-receptive with the exception of the depressions which are provided with bottoms of nickel, this metal being color-repellent owing to having been etched by means of sulphuric acid.
  • the method accordingto the invention is applicable for the production of printing forms for other kinds of printing than stereotype printing the image portionsof 'the plate, preliminarily etching the image portions, applying a resist comprising a solution of asphalt and Canada balsam which, by reason of the coating of guml is taken up only by the printing surfaces, then removing the coating of gum by steaming, whereby the asphalt and balsam remains adherent to the printing portions, electrolytically depositing a stereotype metal on the exposed part of the metallic surface of the plate up to the level of the resist surface, removing the resist from the printf ing portions by washing with a solvent therefor,
  • the base of the plate is an iron plate and in which said base is rst electrolytically coated'with a non-corrosive metal, and a coating of'zinc is electrolytically deposited on said non-corrosive metal.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Printing Methods (AREA)
US181051A 1936-12-23 1937-12-21 Method of producing stereotype printing forms electrolytically Expired - Lifetime US2245276A (en)

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Application Number Priority Date Filing Date Title
CH500829X 1936-12-23

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US2245276A true US2245276A (en) 1941-06-10

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US (1) US2245276A (ja)
BE (1) BE425387A (ja)
DE (1) DE743162C (ja)
FR (1) FR831185A (ja)
GB (1) GB500829A (ja)
NL (1) NL49568C (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660252A (en) * 1970-06-17 1972-05-02 De La Rue Giori Sa Method of making engraved printing plates
US3780853A (en) * 1971-05-19 1973-12-25 R Kuhn Type casting matrix and spacing
US20210235549A1 (en) * 2020-01-27 2021-07-29 Lexmark International, Inc. Thin-walled tube heater for fluid

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040476A1 (de) * 1980-10-27 1982-06-03 Vsesojuznyj naučno-issledovatel'skij institut kompleksnych problem poligrafii, Moskva Offsetdruckform und verfahren zu ihrer herstellung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE455228C (de) * 1926-04-17 1928-01-27 Carl Eggen Verfahren zur Herstellung von Offsetdruckformen
BE342111A (ja) * 1926-05-18
DE560464C (de) * 1929-05-16 1932-10-03 Julius Bekk Dr Verfahren zum Herstellen von Flachdruckformen
DE580914C (de) * 1929-08-20 1933-07-18 Julius Bekk Dr Verfahren zur Anbringung von Harzschichten an den Druckstellen von Flachdruckplatten
CH183475A (de) * 1934-02-15 1936-04-15 Anthonius Boekelman Willem Flachdruckform, insbesondere Offsetdruckform, und Verfahren zur Herstellung einer derartigen Druckform.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660252A (en) * 1970-06-17 1972-05-02 De La Rue Giori Sa Method of making engraved printing plates
US3780853A (en) * 1971-05-19 1973-12-25 R Kuhn Type casting matrix and spacing
US20210235549A1 (en) * 2020-01-27 2021-07-29 Lexmark International, Inc. Thin-walled tube heater for fluid

Also Published As

Publication number Publication date
GB500829A (en) 1939-02-16
FR831185A (fr) 1938-08-25
DE743162C (de) 1943-12-18
BE425387A (ja)
NL49568C (ja)

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