EP2935692B1 - Filtre d'égouttage pour la fabrication de papier - Google Patents

Filtre d'égouttage pour la fabrication de papier Download PDF

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Publication number
EP2935692B1
EP2935692B1 EP13815381.2A EP13815381A EP2935692B1 EP 2935692 B1 EP2935692 B1 EP 2935692B1 EP 13815381 A EP13815381 A EP 13815381A EP 2935692 B1 EP2935692 B1 EP 2935692B1
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EP
European Patent Office
Prior art keywords
paper
area
fabric
substructures
depression
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.)
Not-in-force
Application number
EP13815381.2A
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German (de)
English (en)
Other versions
EP2935692A1 (fr
Inventor
Patrick Renner
André Gregarek
Günther WILD
Bernd Stumbeck
Thomas Mang
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.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
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.)
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Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP2935692A1 publication Critical patent/EP2935692A1/fr
Application granted granted Critical
Publication of EP2935692B1 publication Critical patent/EP2935692B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21F1/0027—Screen-cloths
    • 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
    • D21F1/10—Wire-cloths
    • 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
    • D21F11/006—Making patterned paper

Definitions

  • the invention relates to a dewatering screen for the production of paper with a large-area paper thickening with a substantially constant thickness.
  • the invention also relates to a papermaking process using such a dewatering screen.
  • Such watermarks, paper tapers or paper thickenings are for example made DE 10 2006 022 059 A1 .
  • DE 10 2005 042 344 A1 or DE 10 2006 058 513 A1 are known and conventionally generated by corresponding elevations or depressions in the dewatering screen, so by a paper feature corresponding variation of the mesh topography.
  • no paper thickening can be generated with larger dimensions, since the paper thickness produced with increasing distance to the edge of the low spot again blends the Velinnivau outside the low point.
  • a "thickening frame" is generated in the paper, whose Form is defined by the edge of the bottom. While such frames may be desirable in some designs from a design point of view, there is a need for the process-reliable production of true, large-area paper thickenings, which also have a substantially constant paper thickness in the interior.
  • the object of the invention is to avoid the disadvantages of the prior art and, in particular, to enable process-reliable production of large-area paper thickenings.
  • a dewatering screen of the type mentioned in a first aspect of a screen fabric with at least one system of interwoven, longitudinally extending warp threads and transverse thereto weft threads forming Siebmaschen a predetermined Siebmaschen Structure The screen fabric has a screen recess with a contiguous recessed area, the outline shape of which corresponds to the outline shape of the paper thickening to be produced. Further, the recessed area is substantially completely provided with embossed substructures which enlarge the surface of the recessed area and the screen mesh area in the recessed area.
  • a large-area paper thickening is understood to mean a paper thickening which occupies an area of more than 225 mm 2 and particularly preferably more than 600 mm 2 on the paper.
  • the embossed substructures increase the surface of the depression region and / or the mesh surface in the depression region by more than 0.2%, preferably by more than 1%.
  • the enlargement of the surface of the recess area and / or the screen mesh surface in the recess area further leads to an enlargement of the mesh size of the dewatering screen in the area of the embossed substructures. Accordingly, in this context, both an enlargement of the surface of the depression region and / or the mesh surface, but also of an increase in the mesh size can be spoken by the embossed structures.
  • a concave sieve embossing is particularly advantageous, since thereby an enlargement of the surface or an enlargement of the mesh width is ensured substantially in the entire region of the concave sieve embossing.
  • a concave sieve embossing is used in the present case when the embossing is additionally lowered in relation to the base level of the sieve or depression.
  • the increased surface area in the recessed area, and in particular the larger screen mesh size of the screen fabric results in increased accumulation of paper fibers in the recessed area which, unlike conventional, unstructured recesses, allows the desired layer thickness in the thickening area to be achieved over the entire area of the paper thickening.
  • the present invention has shown that expansion of the meshes results in longer lasting effect of the negative pressure for aspirating the fibers in the widened areas, so that more fabric is deposited there for the desired paper thickening can be.
  • the embossed substructures provided according to the invention in the recessed area also lead, according to the current understanding, to a greater roughness in the depression, which results in the deposition / Anchoring of paper fibers favors. Again, this view holds without being in any particular explanation.
  • a dewatering screen of the type mentioned at the outset comprises a perforated injection-molded insert which has an insert depression with a contiguous depression region whose outline shape corresponds to the outline shape of the paper thickening to be produced.
  • the recessed area is substantially completely provided with substructures which increase the surface roughness of the recessed area.
  • the injection molding insert is welded or glued in a preferred variant of the invention with the support wire of the dewatering screen.
  • the injection-molded insert may, for example, have a knobbed edge on which it is connected to the carrier screen.
  • the injection molding insert is injected directly into the carrier screen.
  • the injection molding insert can be arranged in a cut-out region of the carrier screen and connected to it only in an edge region. The injection molding insert can then be lowered in particular so that the maximum height of the insert essentially corresponds to the screen level.
  • the injection molding insert is expediently formed from a hydrophobic plastic, for example from polyoxymethylene. To reduce wear during operation, the plastic may be added with wear-reducing additives.
  • the injection molding insert has a plurality of perforations that ensure dewatering in papermaking.
  • the dimensions of these drainage perforations are chosen so small that they do not adhere to fibers during papermaking.
  • the rejuvenate Perforations to the top design surface of the injection molding insert.
  • the dimensions of the perforations can also be chosen so large that they are visually recognizable in the finished paper as dark marking points. In this case, it makes sense to arrange the perforations and thus the resulting marking points in the form of characters, patterns or a coding.
  • the perforations are preferably produced by means of a laser beam, in particular by means of an infrared laser, such as a CO 2 laser.
  • the injection-molded insert for generating the perforations is acted upon by its rear side facing away from the design surface with laser radiation, so that the design surface of the injection molding insert tapered perforations arise.
  • the perforations in the recess area have a larger hole diameter than the perforations in the outer area, so that the material accumulation in the recess area is increased.
  • the perforations in the depression area can also be produced with a higher laser energy than the perforations in the outer area, so that the hole diameter and thus the material accumulation in the depression area is further increased.
  • the design of the substructures can be very diverse.
  • the substructures may advantageously be formed by pyramids, tetrahedrons, cylinders, lenses, subballs, dishes, cubes, cuboids, burls, pimples or strips.
  • the substructures may form a geometric pattern, such as a checkerboard or diamond pattern, may form or may be within a graphic motif depicting numbers, characters, plants, animals, humans, or objects of the specialization area.
  • a geometric pattern such as a checkerboard or diamond pattern
  • the substructures are designed so that they are imperceptible to the human eye without aids.
  • the shape and / or height of the substructures in both aspects of the invention may be the same or may vary within the pit area for all substructures. Such a variation can be, for example, that two or more different types of substructures are provided with different shape and / or height in the recessed area.
  • the substructures have a maximum height that is 50% or less of the depth of the screen recess or pit and have a maximum depth that is 100% or less of the depth of the screen pit or insert pit.
  • a screen recess may have a basic embossing of 0.3 mm in relation to the outside area and the substructures may rise up to 0.15 mm from this level (ie towards the velvet level, resulting in a reduced embossing) and up to 0.3 mm downwards (ie away from the velvety level, resulting in an increased embossing).
  • the substructures preferably have a minimum length and minimum width of 0.5 mm. Upwards, the size of the substructures is limited only by the sieve size. In particular, in the use of the paper thickenings for edge stabilization of paper sheets, which is explained in more detail below, the substructures can also extend over the entire length or width of the screen fabric.
  • the depression area of the dewatering screen is provided with substructures in more than 90%, preferably in more than 95%, particularly preferably in more than 98% of its area.
  • At least one recessed area is provided for generating at least one large-area paper thickening in the form of a machine-readable feature, in particular a barcode.
  • at least one recessed area can be provided for producing large-area paper thickenings in the edge and / or corner area of the paper.
  • the invention also encompasses a method for producing a paper, in particular a security paper, with at least one large-area paper thickening of substantially constant thickness, in which the paper attachment takes place on a dewatering screen of the type described above.
  • the invention further comprises a paper with at least one large-area paper thickening of substantially constant thickness, produced by the method just mentioned, in which the paper is deposited on a dewatering screen of the type described above.
  • the paper thickening has a substantially constant thickness allows the paper thickening to produce a modulation of the paper thickness produced by the substructures of the dewatering wire.
  • the modulation depth is in any case significantly smaller than the thickening itself and is preferably below 50%, in particular below 25% of the thickening.
  • the modulation depth of the paper in the region of the paper thickening is then in particular below 7.5 .mu.m, so that the paper in the thick area is always at least 122.5 .mu.m and at most 137.5 .mu.m thick. In any case, the paper thickness in the area of the paper thickening nowhere decreases to the paper thickness in the outer area of the paper thickening.
  • Such a paper may advantageously have at least one large-area paper thickening in the form of a machine-readable feature.
  • a plurality of such large-area paper thickenings may be provided which form, for example, a machine-readable barcode.
  • the paper has at least one large-area paper thickening in the edge and / or corner region of the paper.
  • This is particularly suitable for paper sheets, which have a predetermined number of individual benefits and which is additionally provided for edge stabilization with at least one large-area paper thickening in the edge and / or corner region of the paper sheet outside the range of the individual.
  • the individual benefits may include paper thickening, for example in the form of a machine-readable barcode.
  • the above-mentioned paper thickenings in the edge and / or corner area are primarily used for the edge stabilization of paper sheets, in particular in the steel printing of hybrid sheets, as explained in more detail below in connection with concrete exemplary embodiments.
  • the invention also encompasses a paper substrate, in particular of paper of the type mentioned, for the production of a paper banknote or a film composite banknote, the paper substrate having at least one large-area paper thickening of essentially constant thickness.
  • the invention also encompasses a value document, in particular a paper banknote or a foil composite banknote with such a paper substrate.
  • a paper web having at least one large-area paper thickening of essentially constant thickness is produced with a dewatering screen of the type described above. If the paper web is laminated with at least one film, the laminated paper web for laminating adhesive is cured on one Roll wound and is produced from the cured laminated paper web a composite film banknote.
  • Fig. 1 shows a section of a security paper 10, which is a large paper thickening 12 has.
  • the security paper 10 is in Fig. 1 (a) in transmitted light and in Fig. 1 (b) in cross section along the line BB of Fig. 1 (a) shown.
  • the peculiarity of the present invention consists in particular in that the paper thickness S thick of the paper thickening remains substantially constant over a large area.
  • the paper thickening 12 is approximately 15mm x 20mm in size, however, it is to be understood that the invention is also applicable to larger or smaller thickening areas, as discussed in more detail elsewhere herein.
  • a specially designed screen groove is provided in the dewatering screen 20 used for papermaking.
  • the dewatering screen 20 is in Fig. 2 (a) in supervision and in Fig. 2 (b) in cross section along the line BB of Fig. 2 (a) shown.
  • Fig. 3 shows the detail section III of the mesh fabric of the dewatering screen 20 in the outer region 34, in Fig. 3 (a) in cross section and in Fig. 3 (b) in supervision.
  • the screen fabric 22 of the dewatering screen 20 includes at least one system of interwoven longitudinally extending warp yarns 24 and weft yarns 26 extending transversely thereto.
  • the screen fabric 22 is a metal fabric, namely a bronze fabric, but in other configurations the mesh fabric may also be a metal plastic Mixed fabric, in particular a bronze-plastic mixed fabric, or even a pure plastic fabric.
  • the screen fabric may be single-layered or multi-layered, wherein for the sake of simplicity, only one single-layered screen fabric is shown in the figures.
  • Fig. 3 (b) To recognize the warp threads 24 and the weft threads 26 form Siebmaschen 28 with a certain predetermined Siebmaschenweite W and a Siebmaschen Structure W 2nd
  • the screen fabric 22 also has a screen recess 30 with a contiguous recessed area 32, the outline shape of which corresponds to the outline shape of the paper thickening 12 to be produced.
  • the recessed area 32 is substantially completely provided with embossed substructures 36 which enlarge the surface of the recessed area 32 as well as the mesh surface in the recessed area 32.
  • the substructures 36 are designed in the form of parallel strips, which lead to a sinusoidal modulation of the surface topography of the screen fabric 22 in the recessed area 32.
  • Fig. 4 12 schematically shows a perspective detailed view of the screen fabric 22 provided with embossed substructures 36 in the recessed area 32 and illustrates how the embossing of the substructures 36 and the sinusoidal modulation of the surface topography generated thereby results in an increased mesh width W 'of the screen fabric 22 and thus in an enlarged screen mesh surface W *. W 'leads. For the sake of clarity, only the surface of the screen fabric 22 is shown.
  • Fig. 5 shows in (a) to (d) by way of example some further variants of embossed substructures according to the invention.
  • the recessed area 40 of Fig. 5 (a) is provided with a plurality of nubbed embossed substructures 42, which occupy substantially the entire area of the recess.
  • knob-shaped substructures 42 it is also possible, for example, to provide pyramidal, tetrahedral, cuboid, lenticular or partially spherical substructures.
  • the substructures can both increase the depth of the depression, preferably by not more than 100%, as well as downsize, preferably by not more than 50%.
  • the recess in the embodiment of the Fig. 5 (a) a nominal depth of 0.3 mm, from which the knobs extend 0.15 mm upwards, ie in the direction of the velvet level, while the gap between the knobs is lowered by 0.05 mm downwards, ie away from the velvet level. On average, this results in just the nominal depth of the recessed area.
  • the nub substructures 42 are in FIG Fig. 5 (a) however, in other configurations, it is also possible to randomly distribute the knob substructures 42 or other substructures over the area of the pit area 40.
  • Fig. 5 (b) shows a recessed area 44 with a modification of the stripe pattern of FIG Fig. 2 .
  • the strip-shaped substructures 46 of the Fig. 5 (b) extend within the recessed area in a straight line, but obliquely to the edges of the recessed area 44.
  • directions for the strips 46 are of course possible.
  • the stripes can also be curved or wavy in other designs.
  • Fig. 5 (c) shows a further variant in which embossed rectangular substructures 50 are arranged in a recessed area 48 in the form of a checkerboard pattern.
  • the individual rectangles 50 may, for example, have a dimension of 0.5 mm ⁇ 1 mm and be lowered by a further 0.3 mm in relation to the otherwise 0.3 mm deep recess. It is also possible to provide two different depression depths for the rectangles 50 so as to obtain an even more differentiated checkered pattern.
  • the substructures can also be designed in the form of a motif, as in the recessed area 52 of FIG Fig. 5 (d) shown by the boomerang-shaped embossed substructures 56.
  • the figure also illustrates the simultaneous use of different substructures, namely the motif-shaped substructures 56 and the strip-shaped substructures 54.
  • the substructures 54, 56 have different embossing heights or embossing depths. While the strip-shaped substructures 54 are additionally lowered relative to the base level of the recessed area 52, the motif-shaped substructures 56 rise above the level of the recessed area 52.
  • the geometric cross section of the substructures may, for example, be triangular, quadrangular, convex or concave.
  • the base of the substructures may be angular and / or rounded. It is also possible that the substructures have a further substructure, for example, small triangles may be provided on larger rectangular substructures.
  • the paper thickening area 12 of the Fig. 1 also be produced with a perforated injection molding insert with a specially designed insert recess.
  • Fig. 6 shows in cross-section a dewatering screen 60 with an injection-molded insert 62, which may be welded or glued to a carrier screen 64 of the dewatering screen 60 or may also be injected directly into the carrier screen.
  • the injection molding insert 62 has a plurality of perforations 66 which ensure dewatering in papermaking.
  • the dimensions of these drainage perforations 66 are chosen to be so small in the exemplary embodiment that they do not adhere to fibers during papermaking.
  • the perforations 66 taper toward the uppermost design surface 68 of the injection molding insert 62 and have a hole diameter D outside the insert recess 70 described below.
  • the injection-molded insert 62 contains an insert recess 70 with a contiguous recessed area 72, the outline shape of which corresponds to the outline shape of the paper thickening 12 to be produced.
  • the perforations 66 in the recessed area 72 have a hole diameter D 'larger due to the taper toward the uppermost design surface 68 as the hole diameter D in the outdoor area. Due to the larger hole diameter, the material accumulation in the depression area is enhanced.
  • the recessed area 72 is substantially completely provided with substructures 74 which increase the surface roughness of the injection molding insert in the recessed area.
  • the increased surface roughness leads to a further increase in the material accumulation in the recessed area 72, so that overall sufficient material for the desired paper thickening 12 is deposited.
  • the use of the subunit injection mold inserts according to the invention makes it possible to produce even finer motifs in the paper made with such an injection molding insert, since the substructures of the injection mold inserts are up to 50% smaller than the embossed substructures arranged in the screen recess could be.
  • Fig. 7 shows a modification of the dewatering screen 60 of Fig. 6 in which the perforations of the injection molding insert 62 in the recess area 72 are enlarged relative to the outside area.
  • the perforation was generated by laser application 76 from the rear side of the injection molding insert 62, a higher laser energy was used in the recessed area 72 than in the outer area, so that the perforations 78 of the recessed area have an enlarged diameter.
  • a hole diameter D " which is even larger than the hole diameter D ', results on the upper design surface 68 Fig. 6 is. Due to the further enlarged hole diameter, the material accumulation in the depression area is reinforced again.
  • the paper thickenings produced by the processes described can in particular form functional thick spots in the paper. For example, you can Barcodes formed from large paper thickening represent a machine-readable authenticity mark.
  • a paper layer of a security paper may include a hole track in which the paper layer has a thinned area and in the thinned area a hole through the paper layer.
  • Fig. 8 Fig. 12 schematically shows a security paper sheet 80 carrying a plurality of individual utilities 82 corresponding to the later cut banknotes.
  • the security paper sheet 80 is provided with a large-area, circumferential paper thickening 84 which, as described above, can be produced by means of a suitably designed dewatering screen.
  • the circulating paper thickening 84 stabilizes the paper sheet and avoids parachuting during processing.
  • the paper thickening 84 lies outside of the individual end 82 and is removed in a later method step when cutting the sheet 80.
  • Fig. 9 shows two further, by paper thickening stabilized designs of paper sheets.
  • the corner regions 86 of the paper sheet 80 are provided with large-area paper thickenings. These paper thickenings also lie outside of the individual wicks 82 and are removed in a later method step.
  • the paper thickenings can, for example, also capture the two upper corners and the edge region extending between these corners. This stabilizes the leading edge of the sheet for the tray.

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Claims (11)

  1. Filtre d'égouttage (20) pour la fabrication de papier (10) avec une surépaisseur de papier de grande surface (12, 84, 86, 88), qui occupe sur le papier (10) une surface de plus de 225 mm2 et de préférence de plus de 600 mm2, avec une épaisseur essentiellement constante, dans lequel le filtre d'égouttage (20) présente un tissu de filtre (22) avec au moins chaque fois un système de fils de chaîne (24) tissés les uns avec les autres et s'étendant en direction longitudinale et de fils de trame (26) s'étendant transversalement à ceux-ci, qui forment des mailles de filtre (28) ayant une surface de maille de filtre prédéterminée, dans lequel le tissu de filtre (22) présente un creux de filtre (30) avec une zone de creux continue (32, 40, 44, 48, 52), dont la forme du contour correspond à la forme du contour de la surépaisseur de papier à produire (12), et qui est dotée essentiellement entièrement de sous-structures gaufrées (42, 46, 50, 54, 56), qui augmentent la surface de la zone de creux (32, 40, 44, 48, 52) et la surface de maille de filtre dans la zone de creux (32, 40, 44, 48, 52), dans lequel la zone de creux (32, 40, 44, 48, 52) occupe une surface de plus de 225 mm2 et de préférence encore de 600 mm2.
  2. Filtre d'égouttage (20) selon la revendication 1, caractérisé en ce que les sous-structures gaufrées (42, 46, 50, 54, 56) augmentent la surface de la zone de creux (32, 40, 44, 48, 52) et/ou la surface de maille de filtre dans la zone de creux (32, 40, 44, 48, 52) de plus de 0,2 %, de préférence de plus de 1 %.
  3. Filtre d'égouttage (60) pour la fabrication de papier (10) avec une surépaisseur de papier de grande surface (12), qui occupe sur le papier (10) une surface de plus de 225 mm2 et de préférence de plus de 600 mm2, avec une épaisseur essentiellement constante, dans lequel le filtre d'égouttage (60) présente un insert moulé par injection perforé (62), dans lequel l'insert moulé par injection (62) présente un creux d'insert (70) avec une zone de creux continue (72), dont la forme du contour correspond à la forme du contour de la surépaisseur de papier à produire (12), et qui est dotée essentiellement entièrement de sous-structures (74), qui augmentent la rugosité superficielle de la zone de creux (72), dans lequel la zone de creux occupe une surface de plus de 225 mm2 et de préférence de plus de 600 mm2.
  4. Filtre d'égouttage (20, 60) selon au moins une des revendications 1 à 3, caractérisé en ce que les sous-structures (42, 46, 50, 54, 56, 74) sont formées par des pyramides, des tétraèdres, des cylindres, de lentilles, des billes partielles, des cuvettes, des cubes, des parallélépipèdes, des boutons, des pics ou des bandes.
  5. Filtre d'égouttage (20, 60) selon au moins une des revendications 1 à 4, caractérisé en ce que les sous-structures (42, 46, 50, 54, 56, 74) forment un motif géométrique, forment un motif graphique, ou sont distribuées de façon aléatoire à l'intérieur de la zone de creux (32, 40, 44, 48, 52, 72).
  6. Filtre d'égouttage (20, 60) selon au moins une des revendications 1 à 5, caractérisé en ce que la forme et/ou la hauteur des sous-structures (42, 46, 50, 54, 56, 74) varient à l'intérieur de la zone de creux (32, 40, 44, 48, 52, 72).
  7. Filtre d'égouttage (20, 60) selon au moins une des revendications 1 à 6, caractérisé en ce que les sous-structures (42, 46, 50, 54, 56, 74) présentent une hauteur maximale, qui vaut 50 % ou moins de la profondeur du creux de filtre (30) ou du creux d'insert (70) et en ce que les sous-structures (42, 46, 50, 54, 56, 74) présentent une profondeur maximale, qui vaut 100 % ou moins de la profondeur du creux de filtre (30) ou du creux d'insert (70).
  8. Filtre d'égouttage (20, 60) selon au moins une des revendications 1 à 7, caractérisé en ce que la zone de creux (32, 40, 44, 48, 52, 72) est munie de sous-structures (42, 46, 50, 54, 56, 74) dans plus de 90 %, de préférence dans plus de 95 %, et de préférence encore dans plus de 98 % de sa surface.
  9. Filtre d'égouttage (20, 60) selon au moins une des revendications 1 à 8, caractérisé en ce qu'il est prévu au moins une zone de creux (32, 40, 44, 48, 52, 72) pour la production d'au moins une surépaisseur de papier de grande surface (84, 88) sous la forme d'une caractéristique lisible à la machine, en particulier d'un code-barres.
  10. Filtre d'égouttage (20, 60) selon au moins une des revendications 1 à 9, caractérisé en ce qu'il est prévu au moins une zone de creux (32, 40, 44, 48, 52, 72) pour la production de surépaisseurs de papier de grande surface (84, 88) dans la région du bord et/ou des coins (86) du papier (10).
  11. Procédé de fabrication d'un papier (10), en particulier d'un papier de sécurité, avec au moins une surépaisseur de papier de grande surface (12, 84, 88), qui occupe sur le papier (10) une surface de plus de 225 mm2 et de préférence de plus de 600 mm2, avec une épaisseur essentiellement constante, dans lequel on effectue le dépôt de papier sur un filtre d'égouttage (20, 60) selon au moins une des revendications 1 à 10.
EP13815381.2A 2012-12-18 2013-12-17 Filtre d'égouttage pour la fabrication de papier Not-in-force EP2935692B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210024774 DE102012024774A1 (de) 2012-12-18 2012-12-18 Entwässerungssieb für die Papierherstellung
PCT/EP2013/003811 WO2014095038A1 (fr) 2012-12-18 2013-12-17 Filtre d'égouttage pour la fabrication de papier

Publications (2)

Publication Number Publication Date
EP2935692A1 EP2935692A1 (fr) 2015-10-28
EP2935692B1 true EP2935692B1 (fr) 2018-10-10

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EP13815381.2A Not-in-force EP2935692B1 (fr) 2012-12-18 2013-12-17 Filtre d'égouttage pour la fabrication de papier

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EP (1) EP2935692B1 (fr)
DE (1) DE102012024774A1 (fr)
ES (1) ES2702599T3 (fr)
WO (1) WO2014095038A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014001064A1 (de) * 2014-01-28 2015-07-30 Giesecke & Devrient Gmbh Entwässerungssieb für die Herstellung von Papier mit papierversteifenden Wasserzeichen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1466755A2 (fr) * 2003-04-03 2004-10-13 De La Rue International Limited Filigrane pour le renforcement des coins d'une feuille

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WO2014095038A1 (fr) 2014-06-26
DE102012024774A1 (de) 2014-06-18
EP2935692A1 (fr) 2015-10-28

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