Classifications

• • 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
  • D21F11/06—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type
  • D21F11/08—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type paper or board consisting of 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
  • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
  • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
  • D21H23/22—Addition to the formed paper
  • D21H23/24—Addition to the formed paper during paper manufacture
• • 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
• • 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

Definitions

• the invention relates to a method of manufacturing a sheet of fibrous material comprising localized contributions of fibrous material.
• Methods of making a sheet of fibrous material including the step of producing thin elements of fibrous material and associating the thin elements therebetween to form the sheet are known.
• the subject of the invention is a process for manufacturing a sheet of fibrous material making it possible to obtain security documents that are different from those known.
• a process for producing a sheet of fibrous material comprising the step of producing thin elements of fibrous material and associating the thin elements together to form the sheet, in which according to the invention at least one of the thin elements is discontinuous and comprises isolated portions of fibrous material.
• the supply of fibrous material is localized way which allows, by giving the isolated portions a particular characteristic (shape, pattern, location, color, presence of identification elements in the fibrous pulp) which distinguishes them from the rest of the document, to create new security possibilities a fibrous document.
• one of the thin elements is continuous and forms a layer of fibrous material.
• the multi-jet manufacturing technique is adapted to implement the method of the invention.
• FIG. 1 is a schematic view of a first embodiment of the method of the invention by means of round porous shapes
• Figure 2 is a schematic view of a second embodiment of the method of the invention by means of round porous shapes
• FIG. 3 is a front view of a fibrous document obtained according to the method of the invention and illustrating several applications of the method of the invention
• FIG. 4 is a sectional view in the thickness of a fibrous document obtained according to the process of the invention and illustrating various applications of the process dice of the invention;
• FIG. 5 is a schematic view of a third embodiment of the method of the invention by means of round porous shapes, adapted to the production of documents with windows;
• FIG. 6 is a partial sectional view at the level of a window of a document obtained by the method illustrated in FIG. 5;
• FIG. 7 is a sectional view in the thickness of a document comprising a watermark obtained according to a particular mode of implementation of the method of the invention.
• a first porous round shape 1 made of a rolled wire cloth immersed in a first bath 2 of fibrous material in dispersion in an aqueous medium is covered with a mask 3 so that only certain areas 4 are isolated from the surface of the fabric of the porous round form
• the mask 3 can be made by applying resin or adhesive to the wire mesh, or by bringing sheet metal portions back onto the wire mesh.
• the thickness of fibrous material that binds to the fabric in the unmasked zones 4 increases progressively as the porous round shape 1 rotates and gives rise to isolated portions. 5 of wet fibrous material.
• a discontinuous stream of wet fibrous material composed of the various insulated portions of moist fibrous material is formed.
• a second porous round shape 8 also made of a wire cloth rolled in a cylinder and bathing in a second bath 9 of fibrous material.
• the second porous round shape 8 here has no mask so that the fibrous material aggregates by depression over the entire surface of the second porous round shape 8. A continuous jet is thus produced forming a layer 10 of wet fibrous material.
• Layer 10 is supported by the conveyor
• the isolated portions 5 intimately marry with the layer 10 to form a sheet of fibrous material with thick spots located at the isolated portions 5. Once the sheet is dry, it is impossible to separate the isolated portions 5 of the layer 10.
• a first porous round shape 21 is used to generate a jet of continuously forming a layer 30 of wet fibrous material, and a second porous round shape 28 partially masked to generate insulated portions 25.
• the layer 30 is brought in line with the second porous round shape by a conveyor 26 and pressed against it. ci by a cylinder 27 sucking so that the insulated portions 25 form localized deposits which adhere to the layer 30.
• the fibrous support 41 is illustrated here before printing.
• the fibrous support 41 here contains a security tape 50 (for example a metal ribbon) which has been inserted in a manner known per se into the layer of fibrous material forming the fibrous support 41 during the manufacture thereof.
• the fibrous support 41 firstly comprises a fibrous material band 42 added to the fibrous support 41 according to the method of the invention.
• porous round shape is used, the mask of which reveals elongate zones extending along generatrices of the porous round shape, so that the porous round shape gives rise to isolated portions of fibrous material in form. strips that are reported on the associated continuous layer.
• the fibrous solution used to make the web 42 contains identifying elements such as optical effect pigments, which have the effect of varying the color of the web 42 according to the orientation of the incident light. These pigments are symbolized by dots in FIG.
• the band 42 is intimately bound to the fibrous support 41 but the pigments The effects with optical effect remain confined in the band 42. It is thus possible to produce a sheet comprising localized contributions of identification elements, which is not possible in the known processes in which only continuous jets of material are produced. fibrous.
• identification elements such as the aforementioned pigments or other elements such as rare earth
• a possible counterfeit of such a banknote consists in printing a band with an ink loaded with identifying elements in place of the portion 42 of fibrous material reported.
• such forgery is very easily detectable because the ink does not have the thickness of the band reported according to the method of the invention.
• the ink is easily removed by abrasion while it is difficult to remove the insert strip 42 which is closely related to the support 41.
• the security pattern constituted by the strip 42 extends along the wide width of the fibrous support 41. It is thus possible, thanks to the method of the invention, to create elongated safety elements perpendicular to the direction of the security ribbons which are introduced into the fibrous supports during the formation thereof.
• a matrix code may be made comprising a matrix of small fibrous squares reported on the fibrous support according to the method of the invention, some of these squares being selectively removed to form a matrix.
• two-dimensional matrix code According to another particular aspect of the invention, isolated processes of fibrous material having here a visually identifiable star shape 44 have been reported by the process of the invention, one of the stars intentionally extending across the ribbon security 50.
• an insulated portion 45 in the form of a rectangle extending completely on the surface of the security tape 50, without contact with the fiber support 41
• the security tape 50 is impregnated with hot melt glue so that the fibrous material of the insulated portion 43 adheres directly to the security tape 50 as it is dried.
• a possible counterfeit of these reasons is to bring on the support portions of cut leaves.
• such counterfeiting is difficult to implement and easily identifiable.
• isolated portions 46 have been reported to corners of the support 41, to strengthen them.
• a fibrous material containing longer, more resistant fibers is used.
• isolated portions 47 of fibrous material having thermoexpansible microbeads are reported on the fibrous support 41.
• the microbeads expand and give the sheet, in the area of isolated portions, a particular touch to identify the sheet.
• the method of the invention makes it possible, as has been indicated, to apply an insulated portion 61 in excess of a continuous layer of fibrous material 60.
• the method of the invention also makes it possible to apply an insulated portion 62 in a recess 63 of the layer 60, so that the insulated portion 62 comes fill the hollow.
• a fibrous material distinct from that of the layer for example a colored fibrous material or containing identification elements, without, however, giving rise to an excess thickness.
• an insulated portion 64 to fill a hole 65 of the layer 60.
• a fibrous material with long and thick fibers that is favorable to the resistance of the sheet and for the isolated portion may be used.
• 64 a fibrous material with short and fine fibers making it possible to produce particularly fine watermarks.
• a first porous round shape 78 is used to produce a continuous jet forming a layer 80.
• the first porous round shape 78 has embossings 79 making it possible to make orifices 81 in the continuous layer.
• a transparent ribbon 82 is introduced into the fibrous bath which wraps around the porous round shape, resting on the embossings 79, the ribbon having a width slightly greater than the width of the embossings 79.
• the fibers agglutinate on the porous round shape 80 on both sides of the transparent tape 82 and under the latter, except of course at the embossings.
• a second porous round shape 71 is partially masked to produce a discontinuous stream which forms insulated frame-shaped portions 75 with a central opening 76. These insulated portions are affixed to the layer 80 so that the opening central 76 is facing one of the orifices 81 of the layer 80.
• the layer 80 comprises an orifice 81 covered by the transparent tape 82.
• This latter is covered by an insulated portion 75 in the form of a frame (half of which is seen here) of which the opening 76 is facing orifice 81.
• Insulated portion 75 covers the edge of transparent ribbon 82 and extends beyond this edge to contact the fibrous material of layer 80.
• the isolated portion It adheres to both the transparent tape (which is coated with hot-melt glue) and the fibrous material of the layer 80, and helps to strengthen the edges of the window thus created.
• a transparent microperforated ribbon is used, which facilitates the aspiration of the layer 80 when it is taken from the porous round shape 78 and allows the evacuation of the water contained in the fibrous material in contact with the surface.
• transparent ban 82 This transparent tape can of course itself include security elements.
• a fibrous layer 90 is produced in a first fibrous material, the layer having locally variations in thicknesses in a given pattern which form a first portion 91 of the watermark according to the invention.
• an isolated portion 92 made in a second fibrous material of a different color from that of the first fibrous material, the insulated portion 92 having variations in thickness in a complementary pattern so as to form a second portion of the watermark according to the invention.
• porous round shape producing a continuous stream forming the layer and a porous round shape producing a discontinuous stream composed of isolated portions which form localized deposits
• one or more other porous round shapes may be used to produce, for example, an additional continuous layer for sandwiching the localized portions between the two layers, or for applying insulated portions made from a plurality of materials to a single layer. fibrous. Localized portions may be applied to both sides of the same layer, by combining the embodiments shown in FIGS. 1 and 2.
• Isolated dot-shaped portions of different colors can also be applied to the same face of a layer to form a general polychrome pattern.
• a continuous thin layer of fibrous material forming a layer and a discontinuous thin element of fibrous material forming isolated portions are produced
• the invention also covers the case where none of the elements thin is not continuous.
• a sheet may be produced from two discontinuous thin elements each consisting of disjointed parallel strips, the strips of one of the thin elements being attached with partial overlap between the strips of the other of the thin elements to constitute a thin strip.
• continuous sheet may be provided bevels on the edges of the strips to allow recovery without extra thickness.

Landscapes

• Nonwoven Fabrics (AREA)
• Paper (AREA)
• Laminated Bodies (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=36782616

Family Applications (1)

Country Status (7)

Cited By (8)

Families Citing this family (4)

Family Cites Families (6)

• 2005
  • 2005-10-06 FR FR0510223A patent/FR2891848A1/fr not_active Withdrawn
• 2006
  • 2006-10-03 PL PL06820145T patent/PL1931827T3/pl unknown
  • 2006-10-03 WO PCT/FR2006/002224 patent/WO2007042637A1/fr not_active Ceased
  • 2006-10-03 AT AT06820145T patent/ATE427381T1/de not_active IP Right Cessation
  • 2006-10-03 ES ES06820145T patent/ES2323520T3/es active Active
  • 2006-10-03 DE DE602006006074T patent/DE602006006074D1/de active Active
  • 2006-10-03 EP EP06820145A patent/EP1931827B1/de not_active Not-in-force

Non-Patent Citations (1)

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