Classifications

• • 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
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
  • B42D25/378—Special inks
  • B42D25/387—Special inks absorbing or reflecting ultraviolet light
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/333—Watermarks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/351—Translucent or partly translucent parts, e.g. windows
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
  • B42D25/378—Special inks
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F1/00—Wet end of machines for making continuous webs of paper
  • D21F1/44—Watermarking devices
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
  • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
  • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
  • D21H21/42—Ribbons or strips
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
  • D21H27/30—Multi-ply
  • D21H27/32—Multi-ply with materials applied between the sheets
  • D21H27/34—Continuous materials, e.g. filaments, sheets, nets
• • B42D2035/36—

Definitions

• the invention relates to a sheet having marks appearing as a colored mark or colored watermark.
• This sheet is intended to be used for the same applications as the watermarked sheets in a conventional manner. It can in particular be used for the production of security papers such as, for example, banknotes, identity cards, passports, stamped papers, checks, etc.
• a sheet of paper is described containing indices printed in the same mass of the paper during its manufacture.
• the indices are printed by ink jet on the first layer of fibers which is then covered, before drying, by a second layer.
• One of the drawbacks is that the printing ink can diffuse in the layers of fibers in the wet phase; the impression will therefore not be clear.
• Another disadvantage is that you have to put printing devices on the paper machine.
• thermoplastic the indices having been previously printed on the internal face of one of the sheets.
• the indices can be printed on a transparent support sheet which will be joined between the other sheets using an adhesive or a thermoplastic layer.
• a soluble printing medium is used to introduce security indices into the mass of a paper.
• This support made of polyvinyl alcohol fibers, on which the indices were previously printed, is introduced into the liquid paper pulp in the headbox. The support is dissolved hot during the drying of the sheet, therefore after the sheet is formed. This support is completely soluble.
• One of the drawbacks is that it is not possible to use a wide support strip as this causes problems of drainage and of sheet formation. It will therefore not be possible to produce pseudofiligranes which are very wide, representing for example a drawing.
• a non-porous and transparent printing support strip is used, this strip being introduced between jets of paper previously formed.
• This support strip is not soluble, it is for example made of polyester.
• One of the drawbacks of this method is that the support strip is not intimately linked to the mass of the paper. Such a sheet could be easily delaminated at the level of the strip, all the more if the support strip is wide.
• this request relates to the introduction, in a paper, of a security thread which can be wide and not the production of a pseudofiligrane in the heart of a paper; it is not mentioned that the indices must be visible only in transmitted light.
• the Applicant proposes to provide a sheet having marks which have the appearance of a monochrome or polychrome watermark, these marks being intimately linked to the mass of the sheet, which can be very wide and printed by any printing process; obtaining the finished sheet by paper.
• the object of the invention is achieved by producing a sheet made up of at least two jets composed at least partially of cellulosic fibers and formed individually by the wet method, of an intimately integrated strip comprising monochrome or polychrome images preprinted on the strip, said strip being partially or totally introduced between the two jets, the marks being partially or totally visible in reflection and completely visible in transmission.
• At least one of the jets has windows. These windows can be obtained in known manner, for example according to the method described in document EP-A-229 645. Windows can also be created by laser drilling.
• the support strip comprises at least cellulose fibers and a soluble and / or fusible binder compatible with cellulose.
• the binder is soluble in water at a temperature of about 60 ° C.
• this binding product is polyvinyl alcohol (denoted PVA), preferably in the form of fibers.
• the support strip is produced beforehand, wet or dry. If it is necessary to dry it, it must be dried at a temperature lower than that of dissolution or melting of the binder.
• the support strip can advantageously be obtained by papermaking from a fibrous composition of cellulose fibers and PVA fibers.
• the relative amounts of cellulose fibers and PVA will have to be adjusted by a person skilled in the art so that the strip is invisible in the finished sheet.
• Those skilled in the art will also take into account the degree of refining of the cellulose since this degree has an influence on the opacity of a sheet. Indeed, this strip should not increase the opacity of the sheet at the place where it was inserted, otherwise we would notice a darker strip in the sheet. It must also not over-transparentize the jets constituting the sheet, this transparentization being done during the dissolution of the PVA, otherwise a lighter band would be noticed in the sheet.
• the support strip may also contain a clouding pigment such as titanium dioxide.
• the support strip is produced by the papermaking process, it may contain other additives used in stationery.
• the support strip may also include security elements, in particular security fibers.
• the support strip is printed according to the brand or pattern of the desired watermark.
• marks which can be observed only in transmitted light in the finished sheet they should preferably be printed with an opaque and light-colored ink, in particular in pastel shades.
• the marks are printed on the support strip with white ink tinted with pastel dyes.
• the ink may also have a luminescent character.
• a crosslinkable ink is used by the action of ultraviolet (UV) radiation; this crosslinking prevents the ink from diffusing into the porous support strip and / or into the jets during the manufacture of the sheet to be obtained according to the invention.
• UV ultraviolet
• the support strip can be printed by offset, by gravure printing.
• the marks can be letters, numbers, ideograms, drawings etc.
• the support strip may include other marks which appear in reflected light in the finished sheet.
• the support strip Once the support strip has been manufactured and printed, it is inserted into the sheet so that the marks printed on the strip appear as a watermark and without the presence of the support strip being guessed.
• the sheet can then optionally be treated in a size press if necessary.
• the soluble and / or fusible binder is transformed either in contact with wet jets and / or dried by heat and / or hot water which evaporates.
• the binder When the binder is PVA, it is dissolved hot with water at around 60-70 ° C in a dryer.
• the support strip disappears within the finished sheet and the printed marks are intimately linked to the sheet.
• the jets having been assembled in the wet phase, they are well secured.
• the binder having diffused in the jets, it is very difficult or even impossible to delaminate them at the level of the insertion of the strip.
• the support strip no longer having its own cohesion, a counterfeiter cannot recover it with the printed marks to insert it in a false document or false ticket.
• the support strip is not perceptible in the finished sheet, the sheet gives the impression of having a watermark.
• the cellulose jets may optionally contain fillers, synthetic or mineral fibers, fungicidal, antibacterial agents, wet strength agents or any other product commonly used in stationery.
• the jets can also contain physical authentication elements such as security fibers, planchettes, security threads and / or chemical falsification agents, ie reagents which give a colored reaction under the action, for example of acids, bases, redox or solvents.
• the invention also provides a security or valuable document obtained from said finished sheet, in particular when it also includes security elements and / or tampering agents.
• the marks appearing as a colored watermark representing for example the logo of a company, the brand of a product.
• a support strip is produced by the papermaking route from a fibrous composition containing 40 parts of cellulose fibers refined to 45 degrees Schopper and 60 parts of PVA fibers and optionally conventional adjuvants used in stationery.
• the sheet is dried at a temperature below that of thermosolubilization of the PVA fibers used, that is to say at a temperature below 60 ° C.
• the printed support strip is unwound between the two wet jets.
• This complex is pressed and then dried at a temperature above at least 60 ° C. so as to dissolve the PVA fibers during the evaporation of the water.
• the dissolution of the PVA fibers leads to a transparency of the cotton fiber jets, but this transparency is compensated for by the cellulose fibers provided by the support strip. Furthermore, at the level of the strip, there is no risk of delamination because the binding nature of the PVA has been developed and diffused in the jets during the dissolution of the fibers (PVA) in drying.
• a strip is produced as in Example 1 but which only comprises PVA fibers. We print it as in Example 1. It is introduced between two jets as in Example 1. In the finished sheet, the presence of the support strip is observed due to excessive transparency of the cotton fiber jets.
• a strip is produced as in Example 1, but which only comprises cellulose fibers. We print it as in Example 1. It is introduced between two jets as in Example 1. In the finished sheet, the presence of the support strip is observed due to clouding of the cotton fiber jets at the level of the strip. In addition, the joining of the jets at the level of the strip is not very good.

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Cited By (6)

Citations (7)

• 1992
  • 1992-02-21 FR FR9202006A patent/FR2687697A1/fr active Granted
• 1993
  • 1993-02-09 EP EP93400320A patent/EP0557157A1/de not_active Withdrawn

Patent Citations (7)

Non-Patent Citations (1)

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