GB1574411A - Halftone printing - Google Patents

Halftone printing Download PDF

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Publication number
GB1574411A
GB1574411A GB2316175A GB2316175A GB1574411A GB 1574411 A GB1574411 A GB 1574411A GB 2316175 A GB2316175 A GB 2316175A GB 2316175 A GB2316175 A GB 2316175A GB 1574411 A GB1574411 A GB 1574411A
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GB
United Kingdom
Prior art keywords
screen
print
tone
printing
halftone
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
Application number
GB2316175A
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.)
Individual
Original Assignee
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
Priority to GB2316175A priority Critical patent/GB1574411A/en
Publication of GB1574411A publication Critical patent/GB1574411A/en
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • G03F5/02—Screening processes; Screens therefor by projection methods
    • G03F5/06—Screening processes; Screens therefor by projection methods changing the diaphragm effect

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Methods (AREA)

Description

(54) IMPROVEMENTS IN OR RELATING TO HALFTONE PRINTING (71) I, ARTHUR ERNEST FIELD, 25 Ridgeway Road, Herne, Herne Bay, Kent, English, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- Previous patents have been granted to me concerning improvements in or relating to photomechanical printing processes. These are British Patent Nos. 431,384; 563,028; 824,769 and 901,412, United States Patent No. 2,027,271, South African Patent No.
690/44, Australian Patent No. 123,366 and Canadian Patent No. 509,589.
British Patent No. 563,028 concerns a process for producing a half-tone photographic plate which includes the step of making an exposure, either successively or simultaneously, through a segmented stop as defined therein and through a non circular stop e.g. a square stop.
I have now found that, if the process of British Patent No. 568,028 is used in the preparation of half-tone colour separation negatives to be used in the production of a multicolour half-tone print, it is possible to use a halftone screen with rulings at the same angle for the production of all the colour separation negatives and that despite the use of the same angle a multicolour print can be produced without undesirable Moire pattern.
Accordingly my invention relates to a process of forming a multicolour print by a photomechanical printing process comprising: (i) preparing 2, 3 or 4 halftone colour separation negatives using the process of specification No. 563,028 from a multicoloured original employing a halftone screen and appropriate colour filters the rulings of the screen being at the same angle for each colour separation negative, and (ii) using the resultant halftone colour separation negatives to prepare printing plates from which a multicoloured print is produced.
Preferably the lines on the screen are at an angle of 45C to the horizontal. My process may be used for printing on paper e.g. newspapers, packaging materials, or periodicals or any other suitable surface e.g.
pottery china, glass, plastic, cloth, metal, rubber or cork, or a light sensitive material.
The printing process may be a letterpress, photolitho, photogravure, silk screen, planographic or intaglio printing process.
The filters used are one or more of the usual red, green and blue filters and the filters, used for preparing the black printer.
Having now particularly described my invention, WHAT I CLAIM IS: 1. A process of forming a multicoloured print by a photomechanical printing process comprising: (i) preparing 2, 3 or 4 half-tone colour separation negatives using the process of specification No. 563,028 from a multicoloured original employing a half-tone screen and appropriate colour filters, the rulings of the screen being at the same angle for each colur separation negative and (ii) using the resultant half-tone colour separation negatives to prepare printing plates from which a multicoloured print is produced.
2. A process as claimed in claim 1 wherein the rulings of the screen are at an angle of 45C to the horizontal.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    (54) IMPROVEMENTS IN OR RELATING TO HALFTONE PRINTING (71) I, ARTHUR ERNEST FIELD, 25 Ridgeway Road, Herne, Herne Bay, Kent, English, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- Previous patents have been granted to me concerning improvements in or relating to photomechanical printing processes. These are British Patent Nos. 431,384; 563,028; 824,769 and 901,412, United States Patent No. 2,027,271, South African Patent No.
    690/44, Australian Patent No. 123,366 and Canadian Patent No. 509,589.
    British Patent No. 563,028 concerns a process for producing a half-tone photographic plate which includes the step of making an exposure, either successively or simultaneously, through a segmented stop as defined therein and through a non circular stop e.g. a square stop.
    I have now found that, if the process of British Patent No. 568,028 is used in the preparation of half-tone colour separation negatives to be used in the production of a multicolour half-tone print, it is possible to use a halftone screen with rulings at the same angle for the production of all the colour separation negatives and that despite the use of the same angle a multicolour print can be produced without undesirable Moire pattern.
    Accordingly my invention relates to a process of forming a multicolour print by a photomechanical printing process comprising: (i) preparing 2, 3 or 4 halftone colour separation negatives using the process of specification No. 563,028 from a multicoloured original employing a halftone screen and appropriate colour filters the rulings of the screen being at the same angle for each colour separation negative, and (ii) using the resultant halftone colour separation negatives to prepare printing plates from which a multicoloured print is produced.
    Preferably the lines on the screen are at an angle of 45C to the horizontal. My process may be used for printing on paper e.g. newspapers, packaging materials, or periodicals or any other suitable surface e.g.
    pottery china, glass, plastic, cloth, metal, rubber or cork, or a light sensitive material.
    The printing process may be a letterpress, photolitho, photogravure, silk screen, planographic or intaglio printing process.
    The filters used are one or more of the usual red, green and blue filters and the filters, used for preparing the black printer.
    Having now particularly described my invention, WHAT I CLAIM IS: 1. A process of forming a multicoloured print by a photomechanical printing process comprising: (i) preparing 2, 3 or 4 half-tone colour separation negatives using the process of specification No. 563,028 from a multicoloured original employing a half-tone screen and appropriate colour filters, the rulings of the screen being at the same angle for each colur separation negative and (ii) using the resultant half-tone colour separation negatives to prepare printing plates from which a multicoloured print is produced.
  2. 2. A process as claimed in claim 1 wherein the rulings of the screen are at an angle of 45C to the horizontal.
  3. 3. A process as claimed in claim 1, wherein the print is produced on paper, china, glass, plastic, cloth, metal, rubber or cork.
  4. 4. A process as claimed in claim substantially as herein described.
GB2316175A 1978-03-28 1978-03-28 Halftone printing Expired GB1574411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2316175A GB1574411A (en) 1978-03-28 1978-03-28 Halftone printing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2316175A GB1574411A (en) 1978-03-28 1978-03-28 Halftone printing

Publications (1)

Publication Number Publication Date
GB1574411A true GB1574411A (en) 1980-09-03

Family

ID=10191150

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2316175A Expired GB1574411A (en) 1978-03-28 1978-03-28 Halftone printing

Country Status (1)

Country Link
GB (1) GB1574411A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005059503A1 (en) * 2005-12-06 2007-06-14 Tampoprint Ag Device for printing on cylindrical bottle closures by gravure printing method, has feed device for bottle closures whereby bottle closure may pass stereotype roller from feed device on parallel axis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005059503A1 (en) * 2005-12-06 2007-06-14 Tampoprint Ag Device for printing on cylindrical bottle closures by gravure printing method, has feed device for bottle closures whereby bottle closure may pass stereotype roller from feed device on parallel axis

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee