US3683808A - Water feeding method for offset printing - Google Patents

Water feeding method for offset printing Download PDF

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Publication number
US3683808A
US3683808A US124824A US3683808DA US3683808A US 3683808 A US3683808 A US 3683808A US 124824 A US124824 A US 124824A US 3683808D A US3683808D A US 3683808DA US 3683808 A US3683808 A US 3683808A
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US
United States
Prior art keywords
ink
wetting liquid
water
offset
printing ink
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
Application number
US124824A
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English (en)
Inventor
Taro Kimura
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
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Publication of US3683808A publication Critical patent/US3683808A/en
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development

Definitions

  • the present invention relates to a water feeding method for offset printing and more particularly, to a water feeding method for offset printing using a novel offset printing ink into which is previously dispersed a microcapsulated wetting or damping liquid.
  • a plate cylinder, a blanket cylinder and an impression cylinder are rotated between the side walls of the offset press.
  • the plate clamped around the plate cylinder prints the inked image on the surface of the blanket cylinder and the printed image is then offset or transferred to the sheet as it presses through the press by pressure applied by the impression cylinder.
  • the inking mechanism in general, comprises a form roller, a vibrating roller, an ink distributing roller, a duct roller, an ink fountain roller and an inking knife upon which is placed the printing ink.
  • a water or wetting mechanism comprising a wetting liquid fountain containing the wetting liquid, a water fountain roller and a water vibrating roller which vibrates between the fountain roller and the vibrating roller so as to supply the wetting liquid to the vibrating roller to be mixed with the printing ink upon its surface.
  • the wetting liquid generally consists of water with or without suitable additive agents and serves to maintain the nonprinting areas of the plate repellent to greasy ink. This process is essential for reproduction of better quality prints.
  • the wetting of the plate clamped around the platecylinder is effected by mechanical means.
  • the quantity of wetting liquid to be applied must be precisely controlled. Consequently, the wetting or water mechanism and especially the mechanism driving the water roller is complicated in construction, which in turn results in the offset press being large insize and complex in construction and operation.
  • the wetting liquid is transferred from the wetting mechanism to the vibrating roller where the wetting liquid and ink form a water-in-oil emulsion.
  • this emulsion is fed to the printing plate, ink is selectively applied onto the printing areas while the wetting liquid is applied onto the non-printing areas.
  • the water-in-oil emulsion contains water in the order of 50 percent by weight relative to the whole weight of the emulsion so that the wetting liquid and ink may be smoothly applied to the non-printing and printing areas, respectively. Therefore, if such an emulsion is previously prepared, it may be supplied to an offset press which is not provided with a wetting mechanism.
  • An object of the present invention is to avoid the disadvantages described above characterizing the conventional offset printing.
  • Another object of the present invention is to simplify the construction of the mechanisms of the offset press.
  • Yet another object of the present invention is to provide a process for the simultaneous application of both a wetting liquid and a printing ink to a printing plate of an offset press by use of a novel offset printing ink.
  • a further object of the present invention is to provide an offset press which does not require a separate wetting mechanism for printing.
  • the novel ofiset printing ink consists of a conventional offset printing ink and microcapsules containing a wetting or damping liquid.
  • the microcapsules mixed with the greasy ink are destroyed or crushed on an ink distributing roller or vibrating roller of the offset press and the wetting liquid is dispersed in the greasy ink.
  • the dispersed printing ink is applied to a plate clamped around the plate cylinder of the offset press and the liquid serves to maintain the nonprinting areas of the plate repellent to the greasy ink as same as liquid supplied by the conventional method.
  • the novel printing ink In the present novel printing ink, the wetting liquid and ink will not separate from each other after they are mixed even after prolonged storage.
  • the novel printing ink' is a water-in'oil emulsion which is best suited for application from a vibrating roller wetting liquid and ink on to a printing plate.
  • FIG. 1 is a schematic diagram of aconventional offset press illustrating the simultaneous application of wetting liquid and printing ink of the present invention
  • microcapsules containing wetting liquid are mixed with a conventional greasy offset printing ink.
  • a plate cylinder 2, a blanket cylinder 3 and an impression cylinder 4, etc. rotate between the side walls 1 of the offset press.
  • the plate clamped around the place cylinder 2 prints the inked image on the surface of the blanket cylinder and the printed image is then offset or transferred to the sheet (not shown) as it passes through the press by pressure applied by the impression cylinder 4.
  • the inking mechanism comprises a pair of form rollers 5 and 6, a vibrating roller 7, a duct roller 8, an ink fountain roller 9, and an inking knife 10 upon which is placed printing ink 11.
  • a watering or damping mechanism comprising a damping liquid fountain 12 containing wetting liquid W, a fountain roller 13 and a water roller 14 which vibrates between the fountain roller 13 and the distribution cylinder 7 so as to supply' the wetting liquid W to the distribution cylinder 7 to be mixed with the printing ink upon its surface.
  • the wetting liquid W generally consists of water with or without suitable additive agents and serves to maintain the nonprinting areas of the plate repellent to greasy ink. This process is essential for the reproduction of better quality prints.
  • the damping of the plate clamped around the plate cylinder 2 is accomplished by mechanical means.
  • the quantity of wetting liquid W to be applied must be precisely controlled.
  • the damping or watering mechanism and especially the mechanism driving the water roller 14 is a complicated structure. Because of this structure, the offset press is not only large in size but also complex in construction and in its operation.
  • the inking and watering or damping mechanisms which are used to prepare the waterin-oil type emulsion contain about 50 percent water, by weight, so that the nonprinting areas of the plate may be suitably moistened or damped while the printing areas are suitably applied with the printing ink.
  • a method for directlysupplying onto the offset press with a previously prepared water-in-oil emulsion containing about 50 percent water and about 50 percent printing ink it is impossible to prepare a stable emulsion where there is more than 30 percent water.
  • water dispersed in the printing ink is 50 to 70 percent by weight, it is impossible to prepare the water-in-oil type emulsion suitable for printing.
  • the wetting liquid W is capsulated within a capsule 21 as shown in FIG. 2 by a chemical process.
  • the microcapsules are dispersed in the printing ink at a predetermined ratio prior to their being supplied to the inking mechanism of the offset press.
  • the microcapsules 21 are decapsulated by the distributing cylinder or the vibrating cylinder and the liquid is dispersed in the greasy ink to provide a most suitable water-in-oil type emulsion.
  • the wetting liquid W which is water or an aqueous solution including suitable additive agents. They are for example:
  • the wetting liquid for electrofax offset printing consisting of ferrocyanides such as potassium ferrocyanide and sodium ferrocyanide a phosphates such as sodium phosphate tribasic, ammonium phosphate monobasic, ammonium phosphate dibasic, sodium pyrophosphate, sodium triphosphate and sodium ammonium hydrogen phosphate as a principal component a organic acids such as oxalic acid, citric acid and ammonium citrate dibasic and glycols such as ethyleneglycol and in the order of l to 100 microns'by the following methods: I. Microcapsulation by Under-liquid Spray-drying:
  • a water-in-oil (W/O) type emulsion was prepared by emulsifying 30 cc of the above-mentioned wetting liquid into 150 cc of a 10 percent solution of polystyrene in benzene. To this was added under vigorous agitation 1 liter of 2 percent aqueous solution of gelatin as a minute jet stream. Thus, a complex emulsion of water-in-oil in water (W/O)/W type was obtained. Then, the temperature of the system was raised to 40 C under agitation. By keeping the agitation at this temperature for about 2 hours, polystyrene capsules having a diameter of about 100 p. and containing the wetting liquid therein were obtained.
  • cc of the above-mentioned wetting liquid were added to 400 cc of a mixture of xylene and carbon tetrachloride in the ratio of 1:1, said mixture containing 5 percent of ethyl cellulose, to prepare an emulsion.
  • the emulsion was diluted by adding 400 cc of carbon tetrachloride to it, petroleum ether was added slowly to the diluted emulsion, while the temperature of the system was kept at 10 to 12 C and the agitation was continued.
  • 800 cc of petroleum ether had been added, a thick solution of ethyl cellulose came out around the wetting liquid and surrounded it. Microcapsules containing the wetting liquid thus obtained were separated by decantation.
  • microcapsules containing the wetting liquid were dispersed into printing ink or emulsified printing ink. Examples of the present'invention will be shown below:
  • Example 1 The following constituents were uniformly mixed and dispersed:
  • the prepared printing ink was applied to the plate through the vibrating roller and prints with a better image quality and high reproducibility were obtained. Better results were obtained for both of the master paper plate prepared by Electrofax system and the conventional P.S.plate (pre-sensitizing plate).
  • the printing ink was applied to the plate through the vibrating roller and superior results were attained as in the case of Example 1.
  • microcapsules of the present invention are decapsulated upon the vibrating roller and remain upon it and the plate clamped around the plate cylinder, but their diameters or particle sizes are very fine so that their presence will not impair the printing at all.
  • the wetting solution may be supplied in the form of the microcapsulated wetting solution of the previously suitably prepared composition with respect to the printing ink to be used, so that the water mechanism in the conventional offset press may be advantageously eliminated.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Printing Methods (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
US124824A 1970-03-20 1971-03-16 Water feeding method for offset printing Expired - Lifetime US3683808A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45024305A JPS5018802B1 (fr) 1970-03-20 1970-03-20

Publications (1)

Publication Number Publication Date
US3683808A true US3683808A (en) 1972-08-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US124824A Expired - Lifetime US3683808A (en) 1970-03-20 1971-03-16 Water feeding method for offset printing

Country Status (4)

Country Link
US (1) US3683808A (fr)
JP (1) JPS5018802B1 (fr)
DE (2) DE2113451B2 (fr)
GB (1) GB1333858A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171981A (en) * 1977-04-29 1979-10-23 The Mead Corporation Process for the production of hot melt coating compositions containing microcapsules
FR2568191B1 (fr) * 1984-07-27 1988-07-08 Oiffer Bomsel Samuel Procede pour proteger un document contre la fraude.
EP0314189A3 (fr) * 1987-10-29 1991-01-02 Canon Kabushiki Kaisha Procédé d'impression
DE4446456A1 (de) * 1994-12-27 1996-07-04 Merck Patent Gmbh Pigmentzubereitung und deren Verwendung
JPH08216545A (ja) * 1995-02-17 1996-08-27 Fuji Photo Film Co Ltd 直描型平版印刷版用不感脂化処理液
DE602005012802D1 (de) * 2005-04-21 2009-04-02 Reckitt Benckiser Uk Ltd Vorrichtung und Methode für das Aufbringen einer Behandlungsmittels auf eine Oberfläche

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090704A (en) * 1933-09-13 1937-08-24 Addressograph Multigraph Emulsoid inks
GB903724A (en) * 1957-10-26 1962-08-15 Emile Boillet Improved printing ink
US3608483A (en) * 1969-03-14 1971-09-28 Inc C Olivette & C Spa Inking system with means for milling hydrophobic liquid into water miscible ink film

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090704A (en) * 1933-09-13 1937-08-24 Addressograph Multigraph Emulsoid inks
GB903724A (en) * 1957-10-26 1962-08-15 Emile Boillet Improved printing ink
US3608483A (en) * 1969-03-14 1971-09-28 Inc C Olivette & C Spa Inking system with means for milling hydrophobic liquid into water miscible ink film

Also Published As

Publication number Publication date
JPS5018802B1 (fr) 1975-07-02
DE2113451A1 (de) 1971-10-21
DE2113452A1 (de) 1971-10-14
DE2113451B2 (de) 1973-11-15
GB1333858A (en) 1973-10-17

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