EP0011480A2 - Procédé d'impression magnétique au jet d'encre - Google Patents

Procédé d'impression magnétique au jet d'encre Download PDF

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Publication number
EP0011480A2
EP0011480A2 EP79302557A EP79302557A EP0011480A2 EP 0011480 A2 EP0011480 A2 EP 0011480A2 EP 79302557 A EP79302557 A EP 79302557A EP 79302557 A EP79302557 A EP 79302557A EP 0011480 A2 EP0011480 A2 EP 0011480A2
Authority
EP
European Patent Office
Prior art keywords
magnetic
jet
information
ink
magnetic pigment
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Withdrawn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
EP79302557A
Other languages
German (de)
English (en)
Other versions
EP0011480A3 (fr
Inventor
Ishwar R. Mansukhani
Daniel J. Bickmann
Larry D. Lofgren
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.)
Whittaker Corp
Original Assignee
Whittaker Corp
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 Whittaker Corp filed Critical Whittaker Corp
Publication of EP0011480A2 publication Critical patent/EP0011480A2/fr
Publication of EP0011480A3 publication Critical patent/EP0011480A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/02—Dusting, e.g. with an anti-offset powder for obtaining raised printing such as by thermogravure ; Varnishing

Definitions

  • This invention relates to jet ink recordings characterized by opaque properties in light. More specifically, this invention relates to ink recordings which are opaque in ordinary light and magnetically readable so as to render them particularly suitable as a means for marking various materials.
  • Ink jet printing is a recent development in the art of applying identifying and decorative indicia to a base.
  • a fluid ink is forced, under pressure, through a very small orifice in an orifice block which contains a piezoelectric crystal vibrating at high frequency (50 - 100,000 vibrations per second) causing the ink passing through the orifice to be broken into minute droplets equal in number to the crystal vibrations.
  • the minute droplets are passed through a charging area where individual droplets receive an electrical charge in response to a video signal, the magnitude of the charge being dependent on the amplitude of the video signal.
  • the droplets then pass through an electrical field of fixed intensity, causing a varied deflection of the individual droplets depending on the density of the charge associated therewith, after which the deflected drops are directed to the base medium which is to receive the decorative or informative printed indicia.
  • an ink In order to operate satisfactorily in an ink jet printing system, an ink must display a consistent drop breakup length, drop velocity and drop charge under set operating conditions. It has been determined that inks with viscosities of 25 cps. will perform satisfactorily depending upon the type of nozzle used. However, inks with lower viscosities perform much better. Resistivity of ink may range as high as 10,000 ohm-cm. for satisfactory operations.
  • the information recording process of the present invention includes jet printing by producing a fine jet of liquid droplets, directing the jet toward the recording medium and modulating the density of the jet with an electric field in accordance with information to be recorded.
  • the information is recorded on the medium since the liquid or ink contacts the medium in a pattern determined by the modulation and adheres to the medium upon impact.
  • the liquid may be colorless at this point, as it is subsequently contacted by a magnetic pigment to produce a magnetic image and to make the information opaque and visible.
  • the magnetic pigment is applied to the medium before the ink is dried so that it adheres to the ink, and is preferably applied while the ink is in a tacky state.
  • One method of applying the particles is to pass the medium over a magnetic surface, and thus draw the pigment to the medium by magnetic means.
  • Another means of applying the pigment may be to pass the medium through a fluidized bed of magnetic pigment, the important consideration being the contacting of the medium by the magnetic pigment while the liquid is still sufficiently tacky to adhere the appropriate amount of pigment. This would be determined by such factors as the temperature of the operation, the solvent content in the ink, the pigment selected, and the desired strength of the resulting magnetic image.
  • a comminuted magnetic pigment is used and magnetic means of attraction are used to apply the pigment.
  • Printed ink images as developed by the invention include three basic components.
  • the first is a magnetic pigment, added after the jet ink pattern has been established, for providing visibility of the printed indicia.
  • the second major component is the solvent which provides fluidity to the jet ink which is used and carries in solution or suspension the resin and the other components, as noted below.
  • the third component is a resin or binder which remains on the substrate surface after printing and serves to adhere and bind the comminuted magnetic pigment in position on the substrate surface.
  • various other ingredients may be utilized, including drying, dispersing and wetting agents, plasticizers, diluents and the like.
  • recording medium 10 is provided on supply reel 12 and imprinted by jet printer 14 using backing 16. It then passes around reel 18 and on to take-up reel 20. Reel 18 is positioned in tray 24 so that magnetic particles 26 come in contact with the printed image. The particles stick to the tacky image surface and thereby render the printed information, characters or other format, magnetically readable. The recording medium continues along a path to the take-up reel 20 where the excess particles are brushed off by brush 28.
  • the inks utilizable in the process of the present invention are preferably opaque, as printed, and contain resins and polymers in concentrations of from 1 to 80 weight percent, alone or in blends.
  • the resin or polymer is dissolved in a solvent such as an aliphatic alcohol.
  • solvents utilizable to produce the ink include ketones, aldehydes, ethers, esters, glycols, glycol ethers, hydrocarbons, and lactones.
  • the preferred aliphatic alcohols are all monovalent, and include methyl alcohol, ethyl alcohol, etc.
  • the solvent is also present in an amount of from 1 to 80 weight percent of the liquid, and is a mixture of a lower aliphatic alcohol, and a ketone.
  • the inks have a viscosity of from about 1.5 cps to about 25 cps at 25°C. Preferably, however, the viscosity varies between 1.8 and 7.5 cps.
  • the resistivity of the ink may be as high as 10,000 ohm-cm, but is preferably from about 1,500 to about 4,000 ohm-cm. The viscosity and resistivity of the ink are selected, depending upon the particular jet printing process utilized.
  • the particular ink composition including the resin, the solvent, the viscosity of mixture, and the resistivity of the mixture would be determined by the apparatus in use.
  • the ink utilized must have good adhesion on practically all substrates, and in the process of the present invention, must exhibit good adhesion on aluminum, paper, and polymeric substrates.
  • the after-applied magnetic pigment may vary with the desired eventual use. However, it is preferred that a comminuted magnetic pigment be utilized, and in the most particularly preferred form, comminuted iron oxide is utilized as the magnetic pigment.
  • the resin component of a jet printing ink suitable for printing on coated or virgin metal must also meet a variety of requirements. Of primary importance is the ability of the resin to adhere to the coated or virgin metal surface on which the ink is printed and to maintain this strong adhesion under widely varying conditions of humidity and temperature. When the ink is applied to a metal surface, it must "wet” or adhere to a coated or virgin metal surface, even in the presence of some moisture, and should be moistureproof, not only to maintain adhesion to the metal but also to adhere to the magnetic pigment.
  • the resin component must also be very readily soluble in the solvent combination to form a stable, low viscosity solution so that effective amounts can be dissolved in the solvent without unduly increasing the viscosity of the composition.
  • Synthetic, semi-synthetic and natural resins which is to say both polymerization as well as polycondensation and polyaddition products, are suitable.
  • all resins customary in the printing ink and paint industry may be used.
  • Exemplary resins are described in the lacquer raw material tables of Karstne (4th edition, Hanover, 1967) and in Wagner and Sarx's work on lacquer resins (4th edition, Kunststoff, 1961).
  • colophony and derivatives thereof hydrogenated colophony, di- or polymerized colophony, as calcium or zinc salt, with colophony esterified with mono- or polyvalent alcohols; with resinifiers such as acrylic acid and butanediol or maleic acid and pentaerythritol modified colophony resin; the soluble resins modified with colophony and resins based on acrylic compounds, maleinate resins, oil-free alkyd resins, styrolated alkyd resins, vinyl toluene modified alkyd resins, alkyd resins with synthetic fatty acids, linseed oil alkyd resins, ricinene alkyd resins, castor oil alkyd resins, soy oil alkyd resins, acrylated alkyd resins, also oils and oil varnishes.
  • resinifiers such as acrylic acid and butanediol or maleic acid and pentaerythritol modified colophony resin
  • terpene resins polyvinyl resins such as polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetals, polyvinyl alcohol, polyvinyl ether, copolymers and graft polymers with various vinyl monomers, polyacrylic resins, acrylate resins, polystyrenes, polyisobutylenes, polyesters based on phthalic acid, maleic acid.
  • adipic acid, sebacic acid, etc. naphthalene formaldehyde resins, furane resins, ketone resins, aldehyde resins, polyurethanes (especially urethane primary-products that cure only at elevated temperature), epoxide resins (especially resin-curer mixtures that cure only at elevated temperature) and precondensates thereof.
  • Suitable too are primary products of unsaturated polyester resins, dialkylphthalate-prepolymers, polyolefines such as polyethylene wax or polypropylene wax, indene and cumaronindene resins, carbamide and sulphonamide resins, polyamide and polyester resins, silicone resins? rubber and derivatives thereof, for example, cyclorubber and chlorinated rubber.
  • a further requirement of resin is that it should have sufficient solvent release so that a desired slow rate of drying is obtained on a given substrate.
  • the solvent medium In order to be effective in a formulation of a jet printing ink for a given substrate, the solvent medium must readily dissolve sufficient amounts of the resin component and any desirable optional components such as to achieve the desired level of tacky adhesiveness, conductivity and visual impact of the ink composition. Further, since some degree of evaporation of solvent will occur in the ink supply and ink return systems, thereby, increasing the solids concentration in ink and solvent should have sufficient power to prevent precipitation in this situation.
  • the jet ink normally contains a mixture of an aliphatic monovalent alcohol and at least one other solvent component.
  • Typical aliphatic monovalent alcohols are methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, isobutyl alcohol, n-amyl alcohol, amylalcohol, isoamyl alcohol, hexyl alcohol, heptyl alcohol, octyl alcohol, or a mixture of same.
  • Aliphatic monovalent alcohols with 1 to 8 carbon atoms are particularly preferred.
  • the weight ratio of aliphatic monovalent alcohol to other solvents is preferably 1-99:99-1, especially 30-80:70-20, and particularly 40-80:60-20.
  • Solvents which form the mixture for these inks are ketones, aldehydes, ethers, esters, hydrocarbons, glycol, glycol ethers and lactones.
  • Suitable solvents are hydrocarbons, such as hexane, heptane, octane, decane, cyclopentane, cyclohexane, benzene, toluol, xylol, and ethylbenzene; hydrocarbon halides, such as carbon tetrachloride, ethylene dichloride, trichloroethylene, tetrachloroethane, and dichlorobenzene; ether-type solvents, such as butyl ether, ethylene glycol-diethyl ether, ethylene glycol-monoethyl ether, ethylene glycol-monobutyl ether; ketone-type solvents, such as acetone, methylethyl ketone, methyl
  • This invention uses jet printing inks which have excellent adhesion on various substrates. More particularly the invention uses printing inks which contain very high weight percentages of resin or blend of resins dissolved in a blend of solvents which are compatible with fatty oils and various oils, resins, resinous varnishes, solvents, etc., conventionally used as printing ink materials. Further, if necessary, the ink may be prepared by milling and the addition of dispersing agents, extenders and/or auxiliary materials.
  • binding agent and other additives can be added to the ink.
  • Suitable binding agents are dry oils, such as linseed oil, tung oil, safflower oil, soya oil, dehydrated castor oil; semidrying oils, such as cottonseed oil and beet oil; non-drying oils, such as castor oil and olive oil, aliphatic acids and esters of same, such as oleic acid, linoleic acid, pelargonic acid, caprinic acid, ethyltrideanate and methyl laurate; dicarboxylic acid ester, such as dimethyl phthalate, diethyl phthalate, dibutylphthalate, butylbenzene phthalate, dioctylphthalate, dioctyladipate, dioctylsebacate, dibutylsebacate, monomethyladipate and monoethylpimelate; polyvalent alcohols, such as
  • Liquid resins with a molecular weight under 2000 can also be used, for example, polyester resins, epoxy resins and polybutadiene resins. Compared to commercial nonaqueous ink, the inks exhibit a high printing velocity, and, as a result, excellent electrostatic deflection properties and increased stability are also available.
  • the ink in accordance with the invention is suited for jet printing devices and electrical field type printers.
  • the ink is selected in accordance with the above parameters, provided to a piezoelectic crystal, and formed into very small droplets. It is then subjected to an electric field which is modulated or varied in accordance with a signal corresponding to an image that is to be placed upon a substrate. The resulting changed jet of ink is directed to a substrate or record medium and impinged upon the medium and adhered thereto.
  • the ink composition is selected in such a manner that it properly adheres to the medium, but does not dry completely before contact with the subsequently applied magnetic pigment.
  • the magnetic pigment ca.- be applied by, for instance, dusting, as is well known in the art, or by dipping in a bath of magnetic particles.
  • the pigment can be applied by magnetic means, or otherwise, as previously disclosed herein.
  • the important consideration at this point in the invention is that the image produced by the ink, be it colored or colorless, is in a sufficiently tacky condition that the appropriate amount of magnetic pigment will adhere to the ink surface.
  • a 60% solution of Arochem 650 in methyl ethyl ketone exhibited a viscosity of less than 25 centipoises.
  • a jet ink was formulated using Arochem 650 resin which was slow drying (which provides tack for pigment pick-up and adhesion) by using high boiling ketones, alcohols, etc.
  • a magnetic iron-oxide is applied by a magnetic device over the printed ink to obtain opaque and visible prints.. The pigment only adhered to the prior jet printed area eliminating the jet ink tack.
  • the conductivity is increased by adding sulphonic acid or any other compatible acid.

Landscapes

  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Duplication Or Marking (AREA)
  • Ink Jet (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
EP79302557A 1978-11-16 1979-11-13 Procédé d'impression magnétique au jet d'encre Withdrawn EP0011480A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US96105478A 1978-11-16 1978-11-16
US961054 1978-11-16

Publications (2)

Publication Number Publication Date
EP0011480A2 true EP0011480A2 (fr) 1980-05-28
EP0011480A3 EP0011480A3 (fr) 1981-04-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP79302557A Withdrawn EP0011480A3 (fr) 1978-11-16 1979-11-13 Procédé d'impression magnétique au jet d'encre

Country Status (3)

Country Link
EP (1) EP0011480A3 (fr)
JP (1) JPS55105575A (fr)
AU (1) AU5266279A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005120847A1 (fr) * 2004-06-09 2005-12-22 Inovink Limited Procede d'imagerie et imprimante
US11643559B2 (en) 2017-07-25 2023-05-09 Magnomer, Inc. Methods and compositions for magnetizable plastics
US12478979B2 (en) 2019-01-30 2025-11-25 Magnomer, Inc. Methods and compositions for magnetizable plastics

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1145851A (en) * 1965-03-26 1969-03-19 Molins Machine Co Ltd Improvements in printing apparatus
DE2217985C3 (de) * 1972-04-14 1974-11-14 Bruno 6000 Frankfurt Wombacher Verfahren und Vorrichtung zur Herstellung von Reliefdruck-Erzeugnissen
US4021252A (en) * 1973-10-31 1977-05-03 American Can Company Jet printing ink composition
US4024096A (en) * 1975-07-07 1977-05-17 A. B. Dick Company Jet printing ink composition for glass
US4143381A (en) * 1976-09-01 1979-03-06 Moore Business Forms, Inc. Method for information processing
JPS5453536A (en) * 1977-10-05 1979-04-26 Matsushita Electric Ind Co Ltd Recording method
US4227200A (en) * 1978-10-10 1980-10-07 Whittaker Corporation Pigmented jet printing and product

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005120847A1 (fr) * 2004-06-09 2005-12-22 Inovink Limited Procede d'imagerie et imprimante
US11643559B2 (en) 2017-07-25 2023-05-09 Magnomer, Inc. Methods and compositions for magnetizable plastics
US12209190B2 (en) 2017-07-25 2025-01-28 Magnomer, Inc. Methods and compositions for magnetizable plastics
US12478979B2 (en) 2019-01-30 2025-11-25 Magnomer, Inc. Methods and compositions for magnetizable plastics

Also Published As

Publication number Publication date
JPS55105575A (en) 1980-08-13
AU5266279A (en) 1980-05-22
EP0011480A3 (fr) 1981-04-15

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Inventor name: MANSUKHANI, ISHWAR R.

Inventor name: BICKMANN, DANIEL J.

Inventor name: LOFGREN, LARRY D.