GB2221191A - Process for printing a substrate - Google Patents

Process for printing a substrate Download PDF

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Publication number
GB2221191A
GB2221191A GB8913920A GB8913920A GB2221191A GB 2221191 A GB2221191 A GB 2221191A GB 8913920 A GB8913920 A GB 8913920A GB 8913920 A GB8913920 A GB 8913920A GB 2221191 A GB2221191 A GB 2221191A
Authority
GB
United Kingdom
Prior art keywords
forme
printing
damping
ink
print carrier
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.)
Granted
Application number
GB8913920A
Other versions
GB8913920D0 (en
GB2221191B (en
Inventor
Hermann Fenzel
Herbert Janser
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.)
Wifag Maschinenfabrik AG
Original Assignee
Wifag Maschinenfabrik AG
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 Wifag Maschinenfabrik AG filed Critical Wifag Maschinenfabrik AG
Publication of GB8913920D0 publication Critical patent/GB8913920D0/en
Publication of GB2221191A publication Critical patent/GB2221191A/en
Application granted granted Critical
Publication of GB2221191B publication Critical patent/GB2221191B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • B41M1/10—Intaglio printing ; Gravure printing
    • 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

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Printing Methods (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Description

1 M&C FOLIO: 230P58872 "Process for printing a print carrier" 2221191
WANGDOC: 1443P The invention relates to a process for printing a print carrier on a printing press with at least one printing unit. comprising at least one cylinder carrying a forme, at least one inking unit for applying ink to the forme, and at least one rubber cylinder and/or impression cylinder.
Processes of this type are known. Thus in the offset printing process for example, use is made of a printing plate which has printing lipophilic areas and non-printing hydrophilic areas; which have practically no difference in level. The ink and damping agent applied adhere to printing plate. particular that i there must be an the corresponding places on the In this connexion, it is known in n order to obtain good printed products equilibrium of ink and damping agent. This equilibrium is quite difficult to achieve, particularly at the beginning of printing, as a result of which the occurrence of waste paper is relatively high, and the equilibrium can change during production, so that corrective action is required.
At the same time, marginal zone problems, which depend upon the thickness of the ink layer on the printing plate. occur on the printing plate at the 2 boundary between the ink and the damping agent. The greater the thickness of the ink layer. the greater the occurrence of dot enlargement during printing. This circumstance. however, can affect the intensity of the ink upon the print carrier. For this reason the thickness of the ink layer is set zonewise by way of ink-adjustment screws. for which purpose control means and setting elements are required.
The formes or printing plates used in the rotogravure process have pits etched or engraved in the printing area. These pits are arranged in a grid pattern. and the tone shading is achieved by the dimensioning of the pits. The ink taken up remains adhering to the entire surface of the forme. The non-printing. smooth areas of the forme are wiped off by a doctor blade which extends over the entire width of the forme. In the process the ink present in the pits remains on the forme and is transferred to the print carrier in the printing process. It is clear that the printing ink to be used is always supplied to the print carrier in the correct amount, as a result of which practically the first printed image impresses by its optimum quality. The edge zones of the ink dots, which are sharply differentiated, are also trouble-free.
On account of the demands of precision, during the gravure printing process massive and interchangeable forme cylinders, which substantially restrict the J 3 0 handling and the flexibility in this process, must additionally be used instead of individual plates for supporting the doctor blade.
What is desired is a printing process which permits stable ink separation for reducing waste paper immediately from the beginning of printing on the one hand and high constancy of quality with a given supply of ink and damping agent over the duration of production on the other hand.
According to the present invention, a forme etched or engraved according to the preliminary process customary in rotogravure printing has applied to it both printing ink and a damping agent for damping the forme and subsequently prints a print carrier.
A forme of this type can for example be fitted in an offset rotary press for printing sheet-form material. The forme may be damped quite minimally with a damping unit customary in the offset process. The ink may be applied with an ink-application roller to the forme in the layer thickness required for further processing. The pits engraved or etched in the forme are completely filled with ink. The ink does not remain adhering to the non-printing, previously damped areas.
The printed image may then be transferred to a rubber cylinder, which abuts against the forme cylinder, and from there to the print carrier sheet. The print carrier sheet is pressed against the rubber cylinder by 4 an impression cylinder or a second rubber cylinder, which can at the same time transfer a printed image to the reverse of the print carrier sheet.
The printed image may be transferred directly from the forme to the print carrier. without the intermediary of a rubber cylinder. In this case the print carrier sheet runs between the forme cylinder and an impre7ssion cylinder resting against it.
A damping unit can be dispensed with when the damping agent, which is used in a very small quantity, is mixed with the ink. These known "waterin-oil emulsion inks" have a proport:ion of water which is sufficient to damp the nonprinting areas on the forme in such a way that the ink cannot adhere to the surface which is lipophobic in any case.
The forme can have a multiplelayer structure. Thus, for example, the main surfaces of the pits can have a copper surface, and thus a lipophilic character, whereas the non-printing surface of the forme comprises a chromium layer. with a hydrophilic character.
It is also possible for the forme to be completely coated with chromium. The non-printing. smoothly polished surface does not take up water. In the pit-s, on the other hand, the ink remains suspended during the inking process on account of the surface profile and the pressure build-up in the roller gap, so that good printing products can be achieved even with a forme of this type.
It is likewise possible for a forme of plastics material to be used, the structure of which can be both single-layered and multiple-layered and which exhibits similar behaviour to the copper-chromium forme or the chromium forme, and which could also be processed by means of laser gravure printing.

Claims (6)

Claims:
1. A process for printing a print carrier on a printing press with at least one printing unit. comprising at least one cylinder carrying a forme, at least one inking unit for applying ink to the forme. and at least one rubber cylinder and/or impression cylinder, characterized. in that a forme etched or engraved according to the preliminary process customary in rotogravure printing has applied to it both printing ink and a damping agent for damping the forme and subsequently prints the print carrier.
2. A process as claimed in claim 1, in which the damping agent for damping the forme is applied by a damping unit.
3. A process as claimed in claim 1, in which water-in-oil emulsion ink is used for inking and at the same time for damping the forme.
4. A process as claimed in any of claims 1 to 3. in which the forme has a printing layer which consists of copper. whereas non-printing areas of the forme are coated with chromium.
5. A process as claimed in any of claims 1 to 3. in which the entire forme is coated with chromium.
7
6. A process as claimed in any of claims 1 to 3, in which the forme is of plastics material.
Published 1990 at The Patent Office. State House. 66 71 High Holborn, London WC1R4TP-Purther copies maybe obtained from The Patent Office. Sales Branch. St Mary Cray. Orpington. Kent BR5 3RD Printed by Multiplex techniques ltd. St Mary Cray. Kent. Con. 187
GB8913920A 1988-06-28 1989-06-16 Process for printing a print carrier Expired - Fee Related GB2221191B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3821777A DE3821777A1 (en) 1988-06-28 1988-06-28 METHOD FOR PRINTING A PRINT CARRIER

Publications (3)

Publication Number Publication Date
GB8913920D0 GB8913920D0 (en) 1989-08-02
GB2221191A true GB2221191A (en) 1990-01-31
GB2221191B GB2221191B (en) 1992-02-19

Family

ID=6357426

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8913920A Expired - Fee Related GB2221191B (en) 1988-06-28 1989-06-16 Process for printing a print carrier

Country Status (5)

Country Link
DE (1) DE3821777A1 (en)
FR (1) FR2633218A1 (en)
GB (1) GB2221191B (en)
IT (1) IT1232150B (en)
SE (1) SE8902323L (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4328027A1 (en) * 1993-08-20 1995-02-23 Roland Man Druckmasch Rotary printing machine for making newspapers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB225015A (en) * 1923-10-10 1924-11-27 Caspar Hermann Improvements in the production of printing surfaces
GB491530A (en) * 1937-03-05 1938-09-05 Arthur Ronald Trist Improvements in and relating to non planographic printing plates
GB680436A (en) * 1949-06-21 1952-10-08 Arnold Fistal Improvements in or relating to printing plates and their manufacture
GB1483977A (en) * 1974-07-30 1977-08-24 De La Rue Giori Sa Intaglio printing plates

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB344005A (en) * 1929-11-21 1931-02-23 Oscar Kohn Intaglio off-set lithographic plate and process of making same
NL92541C (en) * 1956-06-19 1900-01-01
DK120733B (en) * 1968-08-02 1971-07-05 R Schou Means for fixing an object to a track, in particular for fixing a cabinet or other fixture for C-profile wall rails.
DE1961316C3 (en) * 1968-12-12 1974-07-25 De La Rue Giori S.A., Lausanne (Schweiz) Process for the production of a steel engraving printing plate
CH491753A (en) * 1969-06-25 1970-06-15 De La Rue Giori Sa Steel engraving printing plate
US4054094A (en) * 1972-08-25 1977-10-18 E. I. Du Pont De Nemours And Company Laser production of lithographic printing plates
FR2378636A1 (en) * 1977-01-28 1978-08-25 Beaune Daniel SOFT SIZE PRINTING PROCESS AND MACHINE FOR IMPLEMENTING THIS PROCESS
US4388864A (en) * 1978-12-11 1983-06-21 Warner "Autolitho" Corporation Lithographic dampening system
DE3116505C2 (en) * 1981-04-25 1985-03-28 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Rotary printing machine that can be used for various printing processes
US4566384A (en) * 1983-01-18 1986-01-28 Dainippon Screen Mfg. Co., Ltd. Intaglio printing plate and printing method
CH666859A5 (en) * 1985-07-19 1988-08-31 Wifag Maschf Printing on rotary press using form cylinder - uses intaglio printing plate and at least one rubber, e.g. offset, print, or pressure cylinder, and ink and moisture application to plate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB225015A (en) * 1923-10-10 1924-11-27 Caspar Hermann Improvements in the production of printing surfaces
GB491530A (en) * 1937-03-05 1938-09-05 Arthur Ronald Trist Improvements in and relating to non planographic printing plates
GB680436A (en) * 1949-06-21 1952-10-08 Arnold Fistal Improvements in or relating to printing plates and their manufacture
GB1483977A (en) * 1974-07-30 1977-08-24 De La Rue Giori Sa Intaglio printing plates

Also Published As

Publication number Publication date
GB8913920D0 (en) 1989-08-02
SE8902323D0 (en) 1989-06-27
FR2633218A1 (en) 1989-12-29
DE3821777C2 (en) 1990-05-31
DE3821777A1 (en) 1990-01-04
IT8948120A0 (en) 1989-06-23
SE8902323L (en) 1989-12-29
GB2221191B (en) 1992-02-19
IT1232150B (en) 1992-01-25

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Legal Events

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

Effective date: 19940616