US2138703A - Method of printing - Google Patents

Method of printing Download PDF

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Publication number
US2138703A
US2138703A US105248A US10524836A US2138703A US 2138703 A US2138703 A US 2138703A US 105248 A US105248 A US 105248A US 10524836 A US10524836 A US 10524836A US 2138703 A US2138703 A US 2138703A
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US
United States
Prior art keywords
printing
ink
plates
inks
etched
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
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US105248A
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English (en)
Inventor
Matuschke Walter
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Individual
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Individual
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Publication date
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Publication of US2138703A publication Critical patent/US2138703A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/02—Letterpress printing, e.g. book printing

Definitions

  • This invention relates to a method of printing with a typographic press, 1. e., one wherein the printing is done directly on the paper from elements having their printing surfaces in relief, and involves the use of printing inks which are solutions and/or dispersions of organic dyestuil's or mineral dyestuils in volatile solvents and relates also to improved relievo printing elements for carrying out such method.
  • the stereotypes and electrotypcs should be degreased before use with suitable solvents, such as alcohol, and particularly in the case of large or unbroken surfaces, should be smoothly polished with polishing media, as for instance, polishing rubber, so as to insure that the inks will be properly taken up and given 0d. Proper polishing of the plates will obviate the tendency of the ink to be depositedin globules.
  • the appli- 1 c tion of the ink to the printing-element is; also simplified, in that it is necessary only to have a single applying roller in'contact with the printing element and which transfers the ink direct- 35 1y from-the immersed roller which dips intothe ink box, but here again the pressure of the inking roller on the printing element should be comparatively light and evenly applied for the best results. Also, the distortion in the face of the 40 printing element from bending on the printing cylinder in rotary machines, is avoided, since the metal elements are preshaped tofit the cylinders.
  • a further advantageof the invention is that the existing stereotype or electrotype arrange- 5 ments in printing plants can be used without any alteration for the production of, the printing forms, except for the polishing operation which, as previously stated, may be necessary to enable the inks which consist of the organic or mineral 50 dyestuffs dissolved or dispersed in 'volatile solutions to be picked up by the printing elements.
  • stereotype plates for rotary newspaper presses can be made in a considerably shorter time than the corresponding rubber printing ele- 55 ments, so that it is possible to produce actual prints, such as head lines, when using inks of this character in the limited time required for such work.
  • Fig. 1 is a diagrammatic view of a rotary typographic press suitable for the practice of the in-. vention.
  • Figs. 2, 3 and 4 show, respectively, partial sectional views of an etchedrelievo plate, an elec- 5 trotype plate and a stereotype plate, and which may be used in the press in practicing the invention.
  • a paper web A is fed between an impression cylinder 13 and a printing 70 cylinder C, the latter bearing the printing plates from which the impression is transferred to the paper web.
  • the printing cylinder, as usual,v is inked by means of an applying roller D rotating with the same peripheral speed as the printing 75 cylinder and arranged for light tangential contact therewith.
  • the ink is contained in a trough E of the usual character from which the ink is picked up by a fountain roller F, arranged to rotate therein.
  • the method of the invention can be practiced by the use of any suitable metal'typographic surface.
  • any suitable metal'typographic surface For example in Fig. 2, there is illustrated an etched screened relievo copper plate G which is virtually the same as the ordinary copper half-tone except that the etching is somewhat deeper, so that the highly fluid ink can run down into the etched recesses without filling them up to the .level of the type high printing surface. It will be readily seen that if the etched recesses were filled up completely, the effect of the dot configuration would be lost with a consequent deleterious effect in the rendering of the tones by the plate. An etched copper or nine line plate can also be used in carrying out the method. 1 The electrotype plate (see Fig.
  • step 40 necessary to make the ordinary electrotype plate suitable for use with the inks herein dealt with is that of rendering the printing surface capable of picking up the highly iiuid ink in a thin film of uniform thickness'over the entire printing surface. This can be done by degreasing the plate before use and by polishing the printing surface to the extent necessary to produce the desired result.
  • the stereotype plate K shown in Fig. 4 is likewise of the usual character and is prepared for use in the instant process by degreasing and polishing the surface, as in the case of the electrotype plate.
  • the three color separation negatives are obtained in the usual way and printed on ordinary white non-transparent photographic paper. Thereafter, visible prints in black and white are obtained from'the three color separation negatives and can be reduced or enlarged to the size desired for the etched plates. These visible prints make it possible for the operator to observe whether thecolor distribution is correct in the three separation negatives or'whether alterations have to be made. If B1?- terations are required, they can be made in a simple manner by raising or lowering the color values on the visible prints, thus eliminating the re-touching in the final plate for removing individual colors and varying tones, a step which is now necessary in the manufacture of ordinary multi-color plates.
  • three screen negatives are made which can be made denser or lighter, as required by varying the illumination. In this way, the screening errors are eliminated.
  • the screen negatives arethen printed in the usual way on the metal plates, for example, zinc or copper plates, having a light sensitive colloid layer, and the printed plates then etched without covering and immediately proved. The covering of the etched plates and the use of mechanical tools generally em-- ployed for voiding the covering errors is thus avoided.
  • the printing element is an electrotype and that the ink is a waterthin, quick-drying solution of dyestufl such as heretofore has been used in a rotary typographic web press only with rubber printing elements.

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  • Printing Methods (AREA)
US105248A 1935-04-11 1936-10-12 Method of printing Expired - Lifetime US2138703A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2138703X 1935-04-11
GB1823237 1937-01-21

Publications (1)

Publication Number Publication Date
US2138703A true US2138703A (en) 1938-11-29

Family

ID=32044208

Family Applications (1)

Application Number Title Priority Date Filing Date
US105248A Expired - Lifetime US2138703A (en) 1935-04-11 1936-10-12 Method of printing

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US (1) US2138703A (enrdf_load_html_response)
GB (1) GB494226A (enrdf_load_html_response)
NL (1) NL47950C (enrdf_load_html_response)

Also Published As

Publication number Publication date
NL47950C (enrdf_load_html_response)
GB494226A (en) 1938-10-21

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