EP0077894A2 - Procédé d'impression planographique et machine d'impression planographique pour ce procédé - Google Patents

Procédé d'impression planographique et machine d'impression planographique pour ce procédé Download PDF

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Publication number
EP0077894A2
EP0077894A2 EP82107280A EP82107280A EP0077894A2 EP 0077894 A2 EP0077894 A2 EP 0077894A2 EP 82107280 A EP82107280 A EP 82107280A EP 82107280 A EP82107280 A EP 82107280A EP 0077894 A2 EP0077894 A2 EP 0077894A2
Authority
EP
European Patent Office
Prior art keywords
printing
roller
ink
plate cylinder
organic solvents
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.)
Withdrawn
Application number
EP82107280A
Other languages
German (de)
English (en)
Other versions
EP0077894A3 (fr
Inventor
Rolf Dr. Kübler
Volker Dr. Schabacker
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.)
BASF Farben und Fasern AG
Original Assignee
BASF Farben und Fasern AG
BASF Lacke und Farben 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
Priority claimed from DE19813141903 external-priority patent/DE3141903C2/de
Priority claimed from DE19823223352 external-priority patent/DE3223352A1/de
Application filed by BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Publication of EP0077894A2 publication Critical patent/EP0077894A2/fr
Publication of EP0077894A3 publication Critical patent/EP0077894A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset 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
    • B41M1/06—Lithographic printing

Definitions

  • the invention relates generally to a planographic printing process in which printing inks containing binders, pigments and organic solvents are transferred from an inking unit to a lithographic printing plate cylinder and from there via a blanket cylinder to a printing material.
  • the offset printing plates have the properties of being water-friendly in the non-information-carrying areas and being oil-friendly in the information-carrying areas.
  • the plate is treated with water, then it is colored with the oil-based printing ink.
  • the hydrophilic areas wetted by the water cannot be from
  • Inking units of offset printing machines have up to 30 rollers, between which the pasty printing inks are rolled out.
  • This long and intensive roller it is not possible to use low-boiling solvents - as is customary in gravure printing - only high-boiling solvents, since otherwise the printing ink dries on the ink rollers and the ink flow would be disturbed.
  • high-boiling mineral oils oiling range above 200 ° C, usually even above 230 ° C for web offset or above 260 ° C for sheetfed offset
  • vegetable oils that are hydrophobic are used as solvents.
  • the ink and wash water are mixed.
  • an offset printing ink changes its rheological properties considerably.
  • the internal forces of the paint are reduced by the mixed water.
  • the Emulsified cleaning water changes the consistency of the colors, they lose a lot of stickiness and stickiness.
  • high-boiling solvents in the printing inks are to be avoided and a uniform ink application is to be achieved without the printing inks drying out in the inking unit.
  • the invention thus relates to a planographic printing process of the type mentioned at the outset, which is characterized in that printing inks, the organic solvents of which have at least 60 percent by weight, based on the total amount of organic solvents, of a boiling range of 100-200 ° C., within the inking unit an anilox roller, which rests on a doctor blade, and transferred to the printing plate cylinder via an ink transfer roller arranged downstream of the anilox roller.
  • Organic solvents are to be understood here and below to mean those constituents which evaporate or blow away when the printing ink dries. However, it should not be understood to mean oils drying by oxidation, which initially also act as solvents, but remain in the printing ink as drying agents.
  • Printing inks are advantageously used whose organic solvents have at least 60% by weight of a boiling range of 150-200 ° C. If a high proportion of solvents is used, the boiling range of which begins at around 100 ° C, the inking unit is advantageously encapsulated.
  • ink transfer rollers instead of a single ink transfer roller, two or more ink transfer rollers working in parallel can also be used. It is essential, however, that the ink transfer rollers each work directly with the anilox roller and with the printing plate cylinder and not several rollers are connected in series.
  • the anilox roller works as an immersion roller, ie it protrudes into the printing ink supply.
  • the printing inks can of course also in other known ways, for example by brushing on the doctor roller be applied.
  • the disadvantages of the mechanical sensitivity of a rubber film forming a color film are avoided by using a rastered metal roller. It is also more resistant to bending and can be scraped off precisely by using grid bars produced by etching or engraving as supporting elements.
  • the uniform ink-absorbing depressions over the entire width of the anilox roller ensure uniform coloring, regardless of the different ink consumption at different locations on the print motif. This also complies with the standardization in offset printing. With the previous inking units, the coloring cannot be kept constant during the printing process. With the new design, only the water supply from the printer needs to be monitored.
  • the inking unit heats up due to internal friction and through many splitting processes of the inks, which causes the inks to become less viscous during the print run. This changes the ink transfer and the ink layer thickness in the printed image. Waste can only be avoided by carefully regulating the color scheme by the printer.
  • the invention also relates to a planographic printing press for carrying out the method according to the invention with an inking unit, a dampening unit, a lithographic printing plate cylinder and a blanket cylinder, which is characterized in that the inking unit has an anilox roller which bears a doctor blade, and one between the anilox roller and the printing plate cylinder arranged ink transfer roller.
  • the anilox roller advantageously projects into the ink fountain as a dipping roller.
  • the printing plate cylinder and the ink transfer roller advantageously have the same diameter.
  • the planographic printing machine advantageously has an intermediate roller arranged between the ink transfer roller and the roller of the dampening unit which bears against the printing plate cylinder. This allows the dried ink to be redissolved in the dampening system.
  • the intermediate roller advantageously has the same diameter as the printing plate cylinder and the ink transfer roller. It is also advantageous that the rollers of the dampening unit have the same diameter as the printing plate cylinder and the ink transfer roller.
  • the invention further relates to printing inks for carrying out the planographic printing process according to the invention on the basis of binders, pigments, organic solvents and known additives, which are characterized in that the organic solvents contain at least 60% by weight, based on the total amount of organic solvents Have boiling range from 100 to 200 ° C, advantageously from 150 to 200 0 C.
  • the printing inks for the planographic printing process according to the invention in which only a few cleavage points are available in the inking unit as contact points between printing ink and water for emulsification, advantageously have a water content of 5 to 30 percent by weight from the outset. This water content of the colors, which can be achieved, for example, by using pigment water pastes and hydrophilic additives, accelerates the establishment of the color / water balance.
  • a major advantage of the invention is the reduction in stenciling due to the short inking unit and the continuous renewal of the ink film by the anilox roller.
  • the temperature in the web offset heatset drying ovens can be significantly reduced, depending on the machine speed, substrate and ink layer thickness. This enables considerable energy savings.
  • the papers dry out less and thus remain dimensionally stable, i.e. they do not absorb any water from the environment after drying and no longer "grow" after processing or storage. Under favorable conditions, these inks can even be dried in web offset with IR emitters or processed without a drying device. These borderline cases depend on solvent, paper, printing speed and ink layer thickness.
  • composition and production of the printing inks according to the invention correspond to the previous techniques with the exception of the solvents.
  • solvents instead of high-boiling mineral oils, with boiling ranges mostly well above 200 ° C with the printing inks previously used, considerably lower boiling solvents are used here, with boiling ranges from 150 ° C.
  • evaporating solvents and mixtures with boiling ranges from 100 ° C can be used even faster.
  • FIG. 1 and 2 each show schematically a section through a planographic printing machine.
  • the planographic printing press has an inking unit 13, a dampening unit 6, a printing plate cylinder 3, a blanket cylinder 11 and an impression cylinder 9.
  • the printing substrate 10 runs between the blanket cylinder 11 and the impression cylinder 9.
  • the inking unit 13 consists of an anilox roller 1, which rests on a doctor blade 2, and an ink transfer roller 4, which is arranged between the anilox roller 1 and the printing plate cylinder 3.
  • the anilox roller 1 works as an immersion roller and protrudes into the ink tray 8.
  • the dampening unit 6 consists of the rollers 5, 14 and 15 and the water tank 12 .
  • the water is metered by adjusting the contact pressure between the rollers 14 and 15.
  • An intermediate roller 7 is arranged between the roller 5 of the dampening unit 6 and the ink transfer roller 4.
  • the printing inks according to the invention have the following composition, for example:
  • alkyd resin, rosin-modified phenolic resin, mineral oil, petroleum jelly, polyethylene wax dispersion and dry retarder are processed into a solution at elevated temperature.
  • Pigment Red 57 is added to the cooled solution. It is dispersed on the three-roll mill.
  • abietic acid, isopropanol and water are mixed in.
  • the printing ink obtained in this way is printed in each case on a planographic printing machine according to the invention using sheet-fed offset or web offset printing on machine-coated paper.
  • the sheets are dried in a stack at room temperature without pollination.
  • the printing press is on Drying oven downstream. It is dried at a temperature of the paper tape of 95 ° C. Excellent printing results are achieved in both cases.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
EP82107280A 1981-10-22 1982-08-11 Procédé d'impression planographique et machine d'impression planographique pour ce procédé Withdrawn EP0077894A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3141903 1981-10-22
DE19813141903 DE3141903C2 (de) 1981-10-22 1981-10-22 Flachdruckverfahren, Flachdruckmaschine und Druckfarbe zur Durchführung des Verfahrens
DE3223352 1982-06-23
DE19823223352 DE3223352A1 (de) 1982-06-23 1982-06-23 Flachdruckmaschine

Publications (2)

Publication Number Publication Date
EP0077894A2 true EP0077894A2 (fr) 1983-05-04
EP0077894A3 EP0077894A3 (fr) 1984-02-22

Family

ID=25796828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107280A Withdrawn EP0077894A3 (fr) 1981-10-22 1982-08-11 Procédé d'impression planographique et machine d'impression planographique pour ce procédé

Country Status (3)

Country Link
EP (1) EP0077894A3 (fr)
BR (1) BR8206150A (fr)
ES (1) ES516773A0 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL52440C (fr) * 1939-03-29
US2778005A (en) * 1955-01-20 1957-01-15 Ibm Core matrix
NL203114A (fr) * 1955-01-29
NL275514A (fr) * 1961-03-06
FR1579104A (fr) * 1968-06-28 1969-08-22
JPS55501136A (fr) * 1978-12-11 1980-12-18
EP0076905B2 (fr) * 1981-10-10 1991-05-02 BASF Lacke + Farben AG Procédé d'impression à plat

Also Published As

Publication number Publication date
ES8307590A1 (es) 1983-07-01
ES516773A0 (es) 1983-07-01
EP0077894A3 (fr) 1984-02-22
BR8206150A (pt) 1983-09-20

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Effective date: 19860323

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Inventor name: KUEBLER, ROLF, DR.

Inventor name: SCHABACKER, VOLKER, DR.