US2798428A - Process of four-colour printing as well as blocks to be used therefor and the printsobtained with said blocks - Google Patents

Process of four-colour printing as well as blocks to be used therefor and the printsobtained with said blocks Download PDF

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Publication number
US2798428A
US2798428A US257596A US25759651A US2798428A US 2798428 A US2798428 A US 2798428A US 257596 A US257596 A US 257596A US 25759651 A US25759651 A US 25759651A US 2798428 A US2798428 A US 2798428A
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United States
Prior art keywords
screens
screen
blocks
colour
printing
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Expired - Lifetime
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US257596A
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English (en)
Inventor
Tollenaar Daniel
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STICHTING INSTITUUT VOOR GRAFISCHE TECHNIEK TNO
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Stichting Inst Voor Grafische
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F5/00—Screening processes; Screens therefor
    • G03F5/22—Screening processes; Screens therefor combining several screens; Elimination of moiré

Definitions

  • the position of the screens is as a rule such that the screens of the different colour plates for red, blue and black, vary 30, and the screen for yellowis at an angle of 15 resp. 75 to the screens for. the blue and the red (sep; aration) colour plates, and at an angle of 45 to the screen for black.
  • the pattern of two systems of parallel lines or of systems of parallel row of dots, having the equal period d, has a period itself:
  • k becomes d, if a has a value of 60; if on has a value of 30, k becomes approximately 1.9 d which means that the interference pattern in not yet large enough to show up clearly in the combinationprint of the screens. If a is 15, however, k equals 3.8 d and the pattern is now clearly visible as a disturbance in the combination-picture.
  • An eflfective measure against this 15 pattern is the use of an mezzograph screen in the yellow, in which the screen dots are distributed at random, so that no interference is possible.
  • a 15 pattern is substantially prevented by the use of 3 identical quaternary screens, the axes thereof forming angles of 30 respectively 60 and combining said screens with a fourth screen, which has approximately the double dotdistance, and an axisof which forms an angle .of respectively 15, 45 and with the axes of the firstmentioned three screens.
  • double dot-distance is preferably used for the screen, and a distance more than 2.5 times the dotdistance of the other screens is avoided.
  • the invention can be applied for letterpress-printing, for litho printing (e. g. oifset plates) as well as for intaglio.
  • Senary screens are known as such and are occasionally applied'for the printing of textiles; however, they have not been used in combination with three quaternary screens for multicolour printing.
  • a process for the production of four-colour prints usingthree identical square screens, the corresponding symmetry axes thereof forming angles respectively of 30 and 60 for printing respectively three colours and using a fourth hexagonal screen, an axis of which forms an angle of 45 and 75 respectively with an axis of the three first-mentioned screens, the dot-distance of said fourth hexagonal screen being between 1.5 and 2.5 times the dot distances of the other screens for printing the fourth colour.
  • Devices such as blocks, offset-plates, intaglio cylinders and plates for four-colour printing, whereby three of the devices are provided with an identical square screen, the axes thereof forming angles respectively of 30 and and a fourth hexagonal screen, an axis of which forms an angle of respectively 15, 45 and with the axes of the other three screens, the dot-distance of said fourth hexagonal screen being between 1.5 and 2.5 times the dot distances of the first-mentioned three screens.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Methods (AREA)
US257596A 1950-11-22 1951-11-21 Process of four-colour printing as well as blocks to be used therefor and the printsobtained with said blocks Expired - Lifetime US2798428A (en)

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Application Number Priority Date Filing Date Title
NL157479 1950-11-22

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US2798428A true US2798428A (en) 1957-07-09

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US257596A Expired - Lifetime US2798428A (en) 1950-11-22 1951-11-21 Process of four-colour printing as well as blocks to be used therefor and the printsobtained with said blocks

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US (1) US2798428A (enrdf_load_stackoverflow)
NL (2) NL157479B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486450A (en) * 1964-02-27 1969-12-30 Eastman Kodak Co Color proofing system
US3607265A (en) * 1969-08-25 1971-09-21 Gordon Baskin Method of preparing a color subtractive mask
US3926117A (en) * 1973-04-13 1975-12-16 Triprint Pty Ltd Color printing method
US4143967A (en) * 1976-07-30 1979-03-13 Benjamin J. Haggquist Latent photo system
US4283471A (en) * 1979-11-02 1981-08-11 Sportelli Frank A Printing screen and method of making same
US4286385A (en) * 1979-12-26 1981-09-01 Huck Joseph F Color screen indicator
US4299165A (en) * 1979-02-22 1981-11-10 C & H Printing Color separation orientation gauge and method
US4394424A (en) * 1981-08-11 1983-07-19 Sportelli Frank A Printing screen and method of making same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE646441C (de) * 1935-04-20 1937-06-14 F A Brockhaus Fa Verfahren zur Herstellung von Vierfarbendruckaufnahmen
GB497194A (en) * 1937-01-05 1938-12-12 Ig Farbenindustrie Ag Process for influencing moire effects in photo-mechanical printing processes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE646441C (de) * 1935-04-20 1937-06-14 F A Brockhaus Fa Verfahren zur Herstellung von Vierfarbendruckaufnahmen
GB497194A (en) * 1937-01-05 1938-12-12 Ig Farbenindustrie Ag Process for influencing moire effects in photo-mechanical printing processes

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486450A (en) * 1964-02-27 1969-12-30 Eastman Kodak Co Color proofing system
US3607265A (en) * 1969-08-25 1971-09-21 Gordon Baskin Method of preparing a color subtractive mask
US3926117A (en) * 1973-04-13 1975-12-16 Triprint Pty Ltd Color printing method
US4143967A (en) * 1976-07-30 1979-03-13 Benjamin J. Haggquist Latent photo system
US4299165A (en) * 1979-02-22 1981-11-10 C & H Printing Color separation orientation gauge and method
US4283471A (en) * 1979-11-02 1981-08-11 Sportelli Frank A Printing screen and method of making same
US4286385A (en) * 1979-12-26 1981-09-01 Huck Joseph F Color screen indicator
US4394424A (en) * 1981-08-11 1983-07-19 Sportelli Frank A Printing screen and method of making same

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NL73517C (enrdf_load_stackoverflow)
NL157479B (nl)

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