EP0027698B2 - Method of producing paper or coated paper carrying an unobtrusive image - Google Patents

Method of producing paper or coated paper carrying an unobtrusive image Download PDF

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Publication number
EP0027698B2
EP0027698B2 EP80303515A EP80303515A EP0027698B2 EP 0027698 B2 EP0027698 B2 EP 0027698B2 EP 80303515 A EP80303515 A EP 80303515A EP 80303515 A EP80303515 A EP 80303515A EP 0027698 B2 EP0027698 B2 EP 0027698B2
Authority
EP
European Patent Office
Prior art keywords
paper
coated
image
unobtrusive
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
Application number
EP80303515A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0027698A2 (en
EP0027698B1 (en
EP0027698A3 (en
Inventor
Martin Allan Riley
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.)
Wiggins Teape Group Ltd
Original Assignee
Wiggins Teape Group 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
Family has litigation
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Application filed by Wiggins Teape Group Ltd filed Critical Wiggins Teape Group Ltd
Priority to AT80303515T priority Critical patent/ATE9561T1/de
Publication of EP0027698A2 publication Critical patent/EP0027698A2/en
Publication of EP0027698A3 publication Critical patent/EP0027698A3/en
Publication of EP0027698B1 publication Critical patent/EP0027698B1/en
Application granted granted Critical
Publication of EP0027698B2 publication Critical patent/EP0027698B2/en
Expired 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
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/10—Watermarks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/10—Duplicating or marking methods; Sheet materials for use therein by using carbon paper or the like

Definitions

  • This invention relates to a method of producing paper or coated paper carrying a printed image, which, in ordinary daylight, is visible but unobtrusive.
  • the unobtrusive image may for example be provided to afford an indication of origin.
  • Watermarking by means of a dandy roll and rubber-marking by means of a raised image on a press roll are well-known means of imparting a feint or unobtrusive image to paper so as to indicate its origin.
  • watermarking and rubber-marking add substantially to the cost of the paper, and hence they have been employed chiefly with high quality papers which command a premium price, such as paper for use in prestige stationery.
  • Watermarking and rubber-marking are normally uneconomic for papers which are produced at high speed, and/or on wide deckle paper machines.
  • a further problem is that in the region of the watermark or rubber-mark some properties of the paper are affected, for example density, absorbency, porosity and smoothness. This may be disadvantageous in some circumstances, for example if the paper is subsequently to be coated and a uniform surface for receiving the coating is desirable. In any event watermarking and rubber-marking are of limited value where coated papers are concerned since the watermark or rubber-mark may be obscured by the coating.
  • DE-A-2043753 discloses the production of transparent symbols in paper by printing on to the paper a polymer-containing composition which has the effect of transparentiz- ing the area of the paper with which it comes into contact.
  • a further proposal is contained in GB-A-696673 which discloses the injection of « units of a material into a paper web as it is formed in a cylinder mould type of paper-machine. This injected material serves to deposit an insoluble substance within the paper web, and may comprise a dye, pigment or ink. The injected material produces an identifying mark.
  • the proposals in DE-A-2043753 and GB-A-696673 would each appear to be subject to at least some of the drawbacks similar to those outlined above in relation to true watermarking and rubber-marking.
  • a method of producing paper or coated paper carrying a printed image which, in ordinary daylight, is visible but unobtrusive characterized in that the printed image is applied to the paper or coated paper by means of a charged droplet printer, preferably an ink-jet printer, associated with the paper-making or paper-coating machine on which the paper or coated paper is produced, whereby the web speed through the printer is the same as the web speed through the machine.
  • a charged droplet printer preferably an ink-jet printer
  • an image which is « unobtrusive is meant an image which does not obtrude in relation to printed, typed or written matter applied to the paper or coated paper before or after application of the unobtrusive image.
  • an array of printers will be provided across the width of the web.
  • the marking material used to produce the unobtrusive image may be an ink or any other material which affords a contrast with the paper or coated paper, for example a resin or other substance which has the effect of transparentiz- ing a paper sheet material to which it is applied.
  • the invention is particularly suitable for use with pressure sensitive copying paper, since the copying paper is not subjected to pressure during the printing operations (any alteration of local properties of the base material caused by water or rubber-marking could be particularly detrimental to the functional performance of a pressure-sensitive copying material).
  • the copying paper is preferably of the kind in which image-formation occurs as a result of reaction between two individually colourless reactants which are brought into contact with one another under the influence of imaging pressure to form a coloured product.
  • one of the reactants (the « colour former ») is contained in solution in microcapsules which are rupturable under the influence of pressure to release their contents into contact with the other reactant (the « colour developer »
  • Pressure sensitive copying systems employing microcapsules in the manner just described may be of the self-contained or transfer type.
  • transfer type an upper sheet is coated on its lower surface with a woating of microcapsules containing colour former solution and a lower sheet is coated on its upper surface with colour developer.
  • Intermediate sheets coated with colour developer on their upper surfaces and microcapsules containing colour former solution on their lower surfaces are provided if more than one copy is required.
  • one surface of the sheet carries a coating composition containing both microcapsules and colour developer.
  • the microcapsules and the colour developer may both be present within the
  • the colour former solution may be present as globules in a pressure-rupturable coated matrix, for example of gelatine, or wax.
  • the present method may be used to apply a feint or unobtrusive image to either surface of the upper, lower or intermediate sheets of a transfer system as just described or to either surface of a self-contained sheet as just described.
  • the reactants used in the pressure sensitive copying paper may be conventional, for example the colour formers may be fluorans, phthalides or spirobipyrans and the colour developers may be, for example, acidic clays, phenolic resins or salts of certain aromatic acids.
  • one reactant may be an aromatic solvent solution of N,N'- di-benzyl-di-thio-oxamide and the other reactant may be a nickel rosinate derivative. Since the nature of pressure sensitive copying paper is now very well known and is described very extensively in the patent literature, further details will not be given herein.
  • Examples of other products to which the present invention is applicable are heat-sensitive recording paper and numerous printing and writing papers ; photographic print base ; automotive air and oil filter base papers ; and compressible gasket and jointing paper.
  • a static experimental ink-jet printing rig (shown in diagrammatic side view in Fig. 1) was used to gain experience of producing unobtrusively-imaged sheets for use in a pressure-sensitive copying system.
  • the rig incorporated an ink gun 1 having a single nozzle 2 adapted to emit a stream of ink droplets 5 in conventional manner.
  • the nozzle 2 was positioned generally above a paper support platform 3 which was movable in two directions x, y at right angles to one another, and to the direction Z of ink droplet emission. Movement of the paper support plaftorm 3 was controlled by punched tape such that ink droplets impinging on the paper could be made to form a desired image.
  • the nozzle had a diameter of about 75 microns and was arranged to be pulsed so as to effect ink droplet formation.
  • Deflector plates 4 were positioned near the nozzle so as to deflect certain of the ink droplets 5 on to the paper (only one deflected drop 7 is shown).
  • a gutter 6 was positioned beneath the nozzle for collecting undeflected ink droplets.
  • a sheet of clay-coated colour developing paper ( « Idem »* CF57 supplied by Wiggins Teape) was positioned (clay-coated side uppermost) on the paper support plaftorm and the rig was operated to produce an unobtrusive image on the sheet.
  • the ink used was a conventional ink jet printing ink except that it was of very much lighter intensity than is used for standard printing operations.
  • the pulse frequency was 64 KHz, which . gave ink droplets of approximately 140 microns diameter, and the deflecting voltage was adjusted until the desired angle of deflection was achieved. The deflection voltage was maintained constant so that each deflected droplet was deflected to the same extent.
  • the arrangement was such that only about one droplet per thousand emitted droplets were actually deflected.
  • the distance of travel before each deflected droplet impinged on the paper was about 70 mm. It was found that the resultant dot diameter on the imaged paper was about 400 microns.
  • the procedure was then repeated first with two microcapsule coated sheets ( « ldem »* CB56 paper supplied by Wiggins Teape), in one case with the uncoated surface uppermost and in the other with the coated surface uppermost and then with two sheets each coated on one surface with colour developing clay and on the other surface with microcapsules ( «ldem•* CFB53 paper supplied by Wiggins Teape).
  • the clay-coated surface was uppermost and in the other case the microcapsule coated surface was uppermost.
  • the desired unobtrusive image was obtained on each occasion.
  • the ink-jet printer described above was mounted adjacent to the web path downstream of the drying station of a paper coating machine and close to a steam jet decurling station.
  • the support platform 3 was of course omitted.
  • a variable deflection voltage was used, so as to deflect the ink droplets to varying extents in order to form the desired image.
  • the voltage variations were controlled by means of a punched tape.
  • a range of coated and uncoated papers were run through the machine at speeds of up to 750 m - min- 1 , and an unobtrusive image was successfully obtained in each case.

Landscapes

  • Color Printing (AREA)
  • Paper (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Silicon Compounds (AREA)
  • Ink Jet (AREA)
  • Printing Methods (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Liquid Developers In Electrophotography (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Duplication Or Marking (AREA)
  • Golf Clubs (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
EP80303515A 1979-10-22 1980-10-06 Method of producing paper or coated paper carrying an unobtrusive image Expired EP0027698B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80303515T ATE9561T1 (de) 1979-10-22 1980-10-06 Blattfoermiges material, das mit einem unauffaelligen bild versehen ist, und verfahren zu seiner herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7936520 1979-10-22
GB7936520 1979-10-22

Publications (4)

Publication Number Publication Date
EP0027698A2 EP0027698A2 (en) 1981-04-29
EP0027698A3 EP0027698A3 (en) 1981-12-30
EP0027698B1 EP0027698B1 (en) 1984-09-26
EP0027698B2 true EP0027698B2 (en) 1989-04-05

Family

ID=10508682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80303515A Expired EP0027698B2 (en) 1979-10-22 1980-10-06 Method of producing paper or coated paper carrying an unobtrusive image

Country Status (15)

Country Link
EP (1) EP0027698B2 (ja)
JP (1) JPS5668196A (ja)
AT (1) ATE9561T1 (ja)
AU (1) AU530402B2 (ja)
BR (1) BR8006687A (ja)
CA (1) CA1157075A (ja)
DE (1) DE3069302D1 (ja)
DK (1) DK445080A (ja)
ES (1) ES496107A0 (ja)
FI (1) FI65113C (ja)
GR (1) GR70318B (ja)
NO (1) NO803132L (ja)
NZ (1) NZ195199A (ja)
PT (1) PT71910B (ja)
ZA (1) ZA806216B (ja)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2561420B1 (fr) * 1984-03-13 1987-07-03 Balauze Marcombe Filigrane d'identite
GB8607689D0 (en) * 1986-03-27 1986-04-30 Wiggins Teape Group Ltd Imaged microcapsule-coated paper
GB8700765D0 (en) * 1987-01-14 1987-02-18 Wiggins Teape Group Ltd Laser apparatus
GB8803560D0 (en) * 1988-02-16 1988-03-16 Wiggins Teape Group Ltd Laser apparatus for repetitively marking moving sheet
GB8807598D0 (en) * 1988-03-30 1988-05-05 Carrs Paper Ltd Paper for use in photocopying &c reprographic processes
GB2244497B (en) * 1988-03-30 1992-04-15 Carrs Paper Ltd Stack of sheet material having sensitive layers
US6406118B1 (en) 1988-12-30 2002-06-18 Canon Kabushiki Kaisha Ink jet recording apparatus having a heat fixing mechanism
EP0376346B1 (en) * 1988-12-30 1996-04-10 Canon Kabushiki Kaisha Ink jet recording apparatus
US5352495A (en) * 1989-02-16 1994-10-04 The Wiggins Teape Group Limited Treatment of a surface by laser energy
DE4304413A1 (de) * 1993-02-13 1994-08-18 Kanzan Spezialpapiere Gmbh Bahnförmiges Trägermaterial für eine thermosensitive Aufzeichnungsschicht
FR2768443B1 (fr) * 1997-09-15 1999-10-15 Arjo Wiggins Papiers Couches Papier couche comportant une marque ressemblant a un filigrane et procede de fabrication
US6334678B1 (en) * 1999-09-01 2002-01-01 International Paper Company Method for applying chemical watermarks on substrate
ITBZ20020016A1 (it) * 2002-03-29 2003-09-29 Ara Paolo Dall Metodo per la realizzazione di un supporto di registrazione verificabile sull'autenticita' e supporto di registrazione cosi' ottenuto.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB696673A (en) * 1949-09-29 1953-09-09 John Knaggs Manufacture of paper
FR2086537A5 (en) * 1970-04-01 1971-12-31 Omop Carbon transfer webs mfre
GB1354890A (en) * 1970-08-26 1974-05-30 Ici Ltd Pattern printing apparatus
DE2043753A1 (en) * 1970-09-03 1972-03-09 Schmidt, Gunter Adolf, 8000 München Paper with "water mark" - by printing with fluid silicone/hardener mixt
US3786517A (en) * 1972-09-05 1974-01-15 Ibm Ink jet printer with ink system filter means
DE2527462A1 (de) * 1975-06-20 1976-12-30 Pelikan Werke Wagner Guenther Gegen faelschung gesicherte vordrucke
DE2905441C3 (de) * 1979-02-13 1981-05-14 GAO Gesellschaft für Automation und Organisation mbH, 8000 München Verfahren zur Herstellung von Wertpapier mit gedruckten Echtheitskennzeichen in einer Papierschicht

Also Published As

Publication number Publication date
BR8006687A (pt) 1981-04-22
NO803132L (no) 1981-04-23
ES8205382A1 (es) 1982-06-01
EP0027698A2 (en) 1981-04-29
ES496107A0 (es) 1982-06-01
GR70318B (ja) 1982-09-10
PT71910A (en) 1980-11-01
AU530402B2 (en) 1983-07-14
JPS5668196A (en) 1981-06-08
FI65113C (fi) 1984-03-12
ATE9561T1 (de) 1984-10-15
FI803281L (fi) 1981-04-23
EP0027698B1 (en) 1984-09-26
DK445080A (da) 1981-04-23
NZ195199A (en) 1982-12-07
FI65113B (fi) 1983-11-30
AU6354680A (en) 1981-04-30
CA1157075A (en) 1983-11-15
ZA806216B (en) 1981-09-30
EP0027698A3 (en) 1981-12-30
PT71910B (en) 1981-10-13
DE3069302D1 (en) 1984-10-31

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