EP2202354A1 - Method of manufacturing a fibrous web with a window - Google Patents

Method of manufacturing a fibrous web with a window Download PDF

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Publication number
EP2202354A1
EP2202354A1 EP09290926A EP09290926A EP2202354A1 EP 2202354 A1 EP2202354 A1 EP 2202354A1 EP 09290926 A EP09290926 A EP 09290926A EP 09290926 A EP09290926 A EP 09290926A EP 2202354 A1 EP2202354 A1 EP 2202354A1
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EP
European Patent Office
Prior art keywords
fibers
support surface
movable support
round shape
ribbon
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.)
Granted
Application number
EP09290926A
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German (de)
French (fr)
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EP2202354B1 (en
Inventor
Frédéric Beauchet
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.)
Banque de France
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Banque de France
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Publication date
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Priority to SI200930370T priority Critical patent/SI2202354T1/en
Priority to PL09290926T priority patent/PL2202354T3/en
Publication of EP2202354A1 publication Critical patent/EP2202354A1/en
Application granted granted Critical
Publication of EP2202354B1 publication Critical patent/EP2202354B1/en
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Classifications

    • 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
    • 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
    • D21F11/008—Making apertured paper
    • 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

Definitions

  • the invention relates to a method of manufacturing a fibrous substrate window.
  • the width of the wide portions of the ribbon prevents the fibers from accumulating at these wide portions, so that they also remain visible on the other side of the sheet.
  • the narrow parts they are covered on the one hand by fibers interfering between the ribbon and the round shape, and on the other hand by fibers covering the narrow parts, so that they are integrated into the thickness of the leaf.
  • This method has the disadvantage that the efficiency of the process depends on the sealing of the embossings by contacting the wide portions of the ribbon with the embossings, which is not easy to achieve, and which requires a very fine synchronization. To ensure good contact, it is also advisable to bring the ribbon into contact with the round shape before the embossing enters the fiber bath, to prevent fibers from interfering between the embossing and the wide part facing, risking to seal faulty. What is more, such a method involves using an impermeable tape.
  • the subject of the invention is a process for manufacturing a fibrous substrate with a window, making it possible to obviate the abovementioned disadvantages.
  • the areas of the movable support surface are already waterproofed so that their effectiveness does not depend on an intimate contact between the ribbon and the movable support surface.
  • the fibers accumulate on the moving support surface except, of course, in the impregnated zones.
  • the ribbon is then introduced near the movable support surface in the bath, while fibers are already deposited on the movable support surface.
  • the bridge portions of the ribbon then rest on the fibers already deposited, while the exposed parts are facing impervious zones.
  • the fibers then continue to settle to cover the bridge portions of the ribbon, the fibers not settling on the exposed portions except on a contour thereof. A fibrous substrate with windows is thus obtained.
  • the invention thus makes it possible to use a movable support surface (generally of round shape) which is devoid of relief, and which is therefore easier to manufacture.
  • the thickness of the fibrous substrate is no longer defined and conditioned by the height of the embossings in relief, but by the choice of the area of the bath of fibrous solution into which the ribbon is introduced.
  • the ribbon 1 illustrated here is a transparent film, for example polyester, has narrow bridge portions 2 connecting wide exposed portions 3, intended to form the transparent portion of a window of the fibrous substrate. Any other type of ribbon can be used, transparent or not.
  • the fibrous substrate is produced by means of a round shape 11 consisting of a porous web generally of a metallic nature, rolled into a cylinder, the round shape rotating in a bath 12 filled with cellulosic fibers in aqueous solution.
  • the round shape 11 comprises impregnated zones 12, corresponding to the windows of the forming substrate.
  • These zones 12 can be waterproofed in various ways. For example, it may be coated with clogging product, such as glue or resin, the areas in question.
  • the deposition of the clogging product can be done using stencils (not shown) of appropriate contour.
  • the clogging product is deposited on the surface of the round shape 11, but it penetrates at least superficially, in the thickness of the porous fabric of the form 11.
  • the waterproofed zones 12 are represented by a thick black line. It will be noted that these impregnated zones 12 do not protrude, little or very little, from the remainder of the round shape 11: at most, they project from the height h of the stencil, when this deposition technique is retained.
  • the clogging product impregnates at least a portion of the thickness of the porous fabric 11, and its amount is adjusted so that it comes to cover the fabric so as to be not or slightly projecting relative to the rest of the surface of the round form 11.
  • the round shape 11 is rotated along its axis, and a natural depression between the outside and the inside of the round shape 11 causes the agglutination of fibers against the round-shaped fabric, except of course at the level of the zones. waterproofed 12.
  • the ribbon 1 is brought near the round shape 11 directly into the bath, here at the mark A, under the free surface of the latter, after the fibers have started to agglutinate against the round shape 11, and in particular 12.
  • the narrow portions of the ribbon 1 thus rest on the fibers already agglutinated between the waterproofed zones 12.
  • the wide portions are facing the sealed areas 12, without touching them, except fortuitously. In any case, the contact is not necessary and is not sought.
  • the wide portions slightly protrude from the impervious zones 12 so that their outline also rests on already deposited fibers.
  • the fibrous substrate thus produced is recovered by a scrubbing cloth 20. It comprises windows by which wide portions of the ribbon 1 are visible on both sides of the substrate.
  • a method of obtaining the waterproofed zones using a sealing agent of the glue / resin type according to the first embodiment consists in coating the entire fabric of the surface 11 'with a photoresist which is irradiated with the radiation. suitable through a film having openings corresponding to the contours of waterproofed areas that is desired. After exposure, the film is removed, the areas that have been exposed to the radiation have cured, while the areas hidden by the film can be easily removed, usually by rinsing with water.
  • FIG. 4 A second embodiment of the invention is shown in Figures 4 and 5 according to two variants, which have in common that the movable support surface 11 'is a round shape made of porous fabric which this time has embossings in hollow 13 on the surface of said surface 11': the waterproofed zones are then formed by materials 14a, 14b filling these hollow embossings 13.
  • the material filling the embossings consists of inserts. They are here metallic, but can alternatively be made of plastic material.
  • the plates 14a are welded in the hollow embossings 13, which are also of a metallic nature. But alternatively, they can be glued or sewn into the embossing, or secured to embossing by any other appropriate means.
  • These plates 14a have a contour substantially complementary to that of the embossings 13, and are of a thickness such that they come, once reported, flush with the rest of the surface of the round shape 11, or, at the very least, be slightly protruding from it (without excluding the case where they are, conversely, slightly below the rest of the surface of the round shape. But as in the first embodiment, it is intended to obtain impregnated areas not or slightly protruding. And as in the previous embodiment, these waterproofed zones are not intended to come into contact with the ribbon 1. It may be noted that a certain tolerance can be allowed in the relative dimensioning and the relative positioning between the hollow embossings and the inserts, as long as the plates can be inserted and fixed to the embossings, which is, industrially, advantageous.
  • the materials 14b filling hollow embossings are based on clogging product resin.
  • a clogging material As in the first mode which also used a clogging material, it will impregnate at least part of the surface of the porous round shape 11 'at its embossings 13.
  • the amount of resin is chosen for the resin to come flush with the surface 11 'in the vicinity of the embossings, knowing that it may also be slightly protruding or slightly recessed relative to said surface.
  • the resin is advantageously chosen so that it can be cast in the embossings and then air dried. It can also be chosen photosensitive, so that it hardens / dries under the effect of radiation, ultraviolet or infrared, for example.
  • the movable support surface is here a round shape, it will of course be possible to use any other type of moving surface, such as a flat canvas moving in a bath.
  • the invention has been described here as using a ribbon with wide parts and narrow parts, it will more generally be possible to use a ribbon comprising exposed portions intended to remain visible in the windows, connected by bridge portions.
  • the bridge portions are narrower than the exposed portions, to allow their overlap by fibers.
  • the bridge portions may be of the same width as the exposed parts, being perforated, so as to allow the accumulation of fibers over the bridge parts.

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  • Woven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)

Abstract

The process comprises rotating a movable support porous surface comprising impermeable zones (12) in a bath of fibrous solution and causing agglutination of the fibers on the support surface, connecting a band (1) comprising exposed parts and bridge parts to an end of the support surface so that the exposed parts are opposite to the sealed areas of the support surface, and continuously agglutinating the fibers so that the fibers are accumulated on bridge parts and around the exposed parts. The impermeable zones are formed on a web using an adhesive product. The process comprises rotating a movable support porous surface comprising impermeable zones (12) in a bath of fibrous solution and causing agglutination of the fibers on the support surface, connecting a band (1) comprising exposed parts and bridge parts to an end of the support surface so that the exposed parts are opposite to the sealed areas of the support surface, and continuously agglutinating the fibers so that the fibers are accumulated on bridge parts and around the exposed parts. The impermeable zones are formed on a web using an adhesive product. The band comprises portions forming narrow parts of the bridge, and large portions forming the exposed parts.

Description

L'invention est relative à un procédé de fabrication d'un substrat fibreux à fenêtre.The invention relates to a method of manufacturing a fibrous substrate window.

ARRIERE-PLAN TECHNOLOGIQUEBACKGROUND

Il est connu du document EP1567713 un procédé pour fabriquer un substrat fibreux, selon lequel on utilise une forme ronde munie d'embossages. Un ruban de largeur variable avec des parties exposées larges reliées par des parties de pont étroites est amené en tangence avec la forme ronde de façon que les parties larges du ruban viennent en contact avec les embossages. Les embossages sont ainsi rendus étanches par les parties larges, de sorte que la pâte fibreuse qui s'accumule sur l'ensemble de la forme ronde par aspiration au travers de la forme ronde ne s'accumule pas au niveau des embossages, ce qui permet de rendre les parties larges du ruban visibles du côté de la feuille en formation tourné vers la forme ronde. De l'autre côté, la largeur des parties larges du ruban empêche les fibres de s'accumuler au niveau de ces parties larges, de sorte qu'elles restent également visibles de l'autre côté de la feuille. Quant aux parties étroites, elles sont recouvertes d'une part par des fibres s'immisçant entre le ruban et la forme ronde, et d'autre part par des fibres recouvrant les parties étroites, de sorte qu'elles sont intégrées dans l'épaisseur de la feuille.It is known from the document EP1567713 a method for producing a fibrous substrate, wherein a round shape with embossings is used. A variable width ribbon with wide exposed portions connected by narrow bridge portions is brought into tangency with the round shape so that the wide portions of the ribbon come into contact with the embossings. The embossings are thus sealed by the wide parts, so that the fibrous paste that accumulates on the whole of the round shape by suction through the round shape does not accumulate at the level of the embossings, which allows to make the wide portions of the ribbon visible from the side of the forming sheet turned towards the round shape. On the other side, the width of the wide portions of the ribbon prevents the fibers from accumulating at these wide portions, so that they also remain visible on the other side of the sheet. As for the narrow parts, they are covered on the one hand by fibers interfering between the ribbon and the round shape, and on the other hand by fibers covering the narrow parts, so that they are integrated into the thickness of the leaf.

Ce procédé présente l'inconvénient que l'efficacité du procédé dépend de l'étanchéification des embossages par contact des parties larges du ruban avec les embossages, ce qui n'est pas simple à réaliser, et ce qui demande une synchronisation très fine. Pour assurer un bon contact, il convient en outre de faire venir le ruban en contact avec la forme ronde avant que l'embossage ne pénètre dans le bain de fibres, pour éviter que des fibres ne viennent s'immiscer entre l'embossage et la partie large en regard, risquant de rendre l'étanchéité défaillante. Qui plus est, un tel procédé implique d'utiliser un ruban imperméable.This method has the disadvantage that the efficiency of the process depends on the sealing of the embossings by contacting the wide portions of the ribbon with the embossings, which is not easy to achieve, and which requires a very fine synchronization. To ensure good contact, it is also advisable to bring the ribbon into contact with the round shape before the embossing enters the fiber bath, to prevent fibers from interfering between the embossing and the wide part facing, risking to seal faulty. What is more, such a method involves using an impermeable tape.

Il est par ailleurs connu du document FR-2 898 365 un procédé pour fabriquer un substrat fibreux présentant des fenêtres transparentes, selon lequel on utilise une forme ronde munie de masques en relief non poreux sur lesquels sont appliqués des segments de film transparent ayant des dimensions supérieures à celles des masques et reliés les uns aux autres par des tronçons de ruban destinés à être emprisonnés dans la couche fibreuse en formation. On a donc ici encore la présence d'embossages en relief sur la forme ronde, embossages dont les inconvénients ont été évoqués plus haut.It is also known from the document FR-2,898,365 a method for producing a fibrous substrate having transparent windows, wherein a round shape is provided with nonporous relief masks to which are applied transparent film segments having dimensions greater than those of the masks and connected to one another by sections of tape to be trapped in the forming fibrous layer. Here again there is the presence of embossing in relief on the round shape, embossings whose disadvantages have been mentioned above.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

L'invention a pour objet un procédé de fabrication d'un substrat fibreux à fenêtre, permettant d'obvier aux inconvénients précités.The subject of the invention is a process for manufacturing a fibrous substrate with a window, making it possible to obviate the abovementioned disadvantages.

BREVE DESCRIPTION DE L'INVENTIONBRIEF DESCRIPTION OF THE INVENTION

En vue de la réalisation de ce but, on propose un procédé de fabrication d'un substrat fibreux comportant des fenêtres, comprenant les étapes de :

  • faire défiler une surface support mobile comportant des zones imperméabilisées peu ou pas saillantes de ladite surface mobile dans un bain de solution fibreuse, et provoquer un agglutinement des fibres sur la surface support mobile ;
  • rapporter à proximité de la surface support mobile un ruban comportant des parties exposées et des parties de pont de sorte que les parties exposées soient sensiblement en regard des zones imperméabilisées de la surface support mobile, le ruban étant introduit à proximité de la surface mobile dans le bain, sous la surface libre de celui-ci, à un endroit pour lequel des fibres se sont déjà accumulées sur la surface du support mobile ;
  • continuer l'agglutinement des fibres de sorte que les fibres s'accumulent sur les parties de pont et sur un contour des parties exposées.
In order to achieve this goal, a method of manufacturing a fibrous substrate having windows comprising the steps of:
  • scrolling a movable support surface having impervious areas of little or no protrusion from said moving surface in a bath of fibrous solution, and causing the fibers to agglutinate on the movable support surface;
  • bringing a ribbon having exposed portions and bridge portions near the movable support surface so that the exposed portions are substantially facing the impervious areas of the movable support surface, the tape being introduced near the moving surface in the bath, beneath the free surface thereof, at a location for which fibers have already accumulated on the surface of the movable support;
  • continue to agglutinate the fibers so that the fibers accumulate on the bridge portions and on an outline of the exposed portions.

Ainsi, les zones de la surface support mobile sont déjà imperméabilisées de sorte que leur efficacité ne dépend pas d'un contact intime entre le ruban et la surface support mobile. Ainsi, les fibres s'accumulent sur la surface support mobile sauf bien entendu dans les zones imperméabilisées. Le ruban est alors introduit à proximité de la surface support mobile, dans le bain, alors que des fibres sont déjà déposées sur la surface support mobile. Les parties de pont du ruban reposent alors sur les fibres déjà déposées, alors que les parties exposées viennent en regard des zones imperméables. Les fibres continuent ensuite à se déposer pour recouvrir les parties de pont du ruban, les fibres ne se déposant pas sur les parties exposées, sauf sur un contour de celles-ci. On obtient ainsi un substrat fibreux à fenêtres.Thus, the areas of the movable support surface are already waterproofed so that their effectiveness does not depend on an intimate contact between the ribbon and the movable support surface. Thus, the fibers accumulate on the moving support surface except, of course, in the impregnated zones. The ribbon is then introduced near the movable support surface in the bath, while fibers are already deposited on the movable support surface. The bridge portions of the ribbon then rest on the fibers already deposited, while the exposed parts are facing impervious zones. The fibers then continue to settle to cover the bridge portions of the ribbon, the fibers not settling on the exposed portions except on a contour thereof. A fibrous substrate with windows is thus obtained.

L'invention permet ainsi d'utiliser une surface de support mobile (généralement de forme ronde) qui est dépourvue de relief, et qui est donc plus facile à fabriquer.The invention thus makes it possible to use a movable support surface (generally of round shape) which is devoid of relief, and which is therefore easier to manufacture.

On constate également qu'avec l'invention, qui préconise des zones imperméabilisées peu ou pas saillantes, l'épaisseur du substrat fibreux n'est plus définie et conditionnée par la hauteur d'embossages en relief, mais par le choix de la zone du bain de solution fibreuse dans laquelle on fait entrer le ruban.It is also noted that with the invention, which recommends impervious zones with little or no protrusion, the thickness of the fibrous substrate is no longer defined and conditioned by the height of the embossings in relief, but by the choice of the area of the bath of fibrous solution into which the ribbon is introduced.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

L'invention sera mieux comprise en référence à la description des figures des dessins annexés, parmi lesquelles :

  • la figure 1 est une vue de face d'un ruban à largeur variable mis en oeuvre dans le cadre de l'invention ;
  • la figure 2 est une vue en coupe schématique d'un dispositif à forme ronde mis en oeuvre selon un premier mode de réalisation l'invention ;
  • la figure 3 est un agrandissement d'une vue en coupe schématique du dispositif selon la figure 2 ;
  • les figures 4 et 5 sont des agrandissements d'une vue en coupe schématique d'un dispositif à forme ronde mis en oeuvre selon un second mode de réalisation de l'invention, conformément, respectivement, à une première et à une seconde variante.
The invention will be better understood with reference to the description of the figures of the appended drawings, among which:
  • the figure 1 is a front view of a variable width ribbon implemented in the context of the invention;
  • the figure 2 is a schematic sectional view of a round-shaped device implemented according to a first embodiment of the invention;
  • the figure 3 is an enlargement of a schematic sectional view of the device according to the figure 2 ;
  • the Figures 4 and 5 are enlargements of a schematic sectional view of a round-shaped device implemented according to a second embodiment of the invention, in accordance with a first and a second variant, respectively.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

En référence à la figure 1, le ruban 1 illustré est ici un film transparent, par exemple en polyester, comporte des parties de pont étroites 2 reliant des parties exposées larges 3, destinées à former la partie transparente d'une fenêtre du substrat fibreux. Tout autre type de ruban peut être utilisé, transparent ou non.With reference to the figure 1 , the ribbon 1 illustrated here is a transparent film, for example polyester, has narrow bridge portions 2 connecting wide exposed portions 3, intended to form the transparent portion of a window of the fibrous substrate. Any other type of ribbon can be used, transparent or not.

Selon un premier mode de réalisation, et en référence à la figure 2, le substrat fibreux est produit au moyen d'une forme ronde 11 constituée d'une toile poreuse généralement de nature métallique, roulée en cylindre, la forme ronde tournant dans un bain 12 rempli de fibres cellulosiques en solution aqueuse.According to a first embodiment, and with reference to the figure 2 the fibrous substrate is produced by means of a round shape 11 consisting of a porous web generally of a metallic nature, rolled into a cylinder, the round shape rotating in a bath 12 filled with cellulosic fibers in aqueous solution.

La forme ronde 11 comporte des zones imperméabilisées 12, correspondant aux fenêtres du substrat en formation. Ces zones 12 peuvent être imperméabilisées de diverses manières. On peut par exemple enduire de produit colmatant, comme de la colle ou de la résine, les zones en question.The round shape 11 comprises impregnated zones 12, corresponding to the windows of the forming substrate. These zones 12 can be waterproofed in various ways. For example, it may be coated with clogging product, such as glue or resin, the areas in question.

Comme détaillé en figure 3, le dépôt du produit colmatant peut se faire à l'aide de pochoirs (non représentés) de contour approprié. Le produit colmatant se dépose à la surface de la forme ronde 11, mais il pénètre au moins superficiellement, dans l'épaisseur de la toile poreuse de la forme 11. Les zones imperméabilisées 12 sont représentées par un trait épais noir. On remarquera que ces zones imperméabilisées 12 ne saillent pas, peu ou très peu, du reste de la forme ronde 11 : au plus, elles saillent de la hauteur h du pochoir, quand cette technique de dépôt est retenue. Comme indiqué plus haut, le produit colmatant imprègne au moins une partie de l'épaisseur de la toile poreuse 11, et sa quantité est ajustée pour qu'il vienne recouvrir la toile de façon à être pas ou peu saillant par rapport au reste de la surface de la forme ronde 11.As detailed in figure 3 the deposition of the clogging product can be done using stencils (not shown) of appropriate contour. The clogging product is deposited on the surface of the round shape 11, but it penetrates at least superficially, in the thickness of the porous fabric of the form 11. The waterproofed zones 12 are represented by a thick black line. It will be noted that these impregnated zones 12 do not protrude, little or very little, from the remainder of the round shape 11: at most, they project from the height h of the stencil, when this deposition technique is retained. As indicated above, the clogging product impregnates at least a portion of the thickness of the porous fabric 11, and its amount is adjusted so that it comes to cover the fabric so as to be not or slightly projecting relative to the rest of the surface of the round form 11.

La forme ronde 11 est mise en rotation selon son axe, et une dépression naturelle entre l'extérieur et l'intérieur de la forme ronde 11 provoque l'agglutination de fibres contre la toile de la forme ronde, sauf bien entendu au niveau des zones imperméabilisées 12.The round shape 11 is rotated along its axis, and a natural depression between the outside and the inside of the round shape 11 causes the agglutination of fibers against the round-shaped fabric, except of course at the level of the zones. waterproofed 12.

Le ruban 1 est amené à proximité de la forme ronde 11 directement dans le bain, ici au niveau du repère A, sous la surface libre de ce dernier, après que des fibres aient commencé à s'agglutiner contre la forme ronde 11, et notamment entre les zones imperméabilisées 12. Les parties étroites du ruban 1 reposent ainsi sur les fibres déjà agglutinées entre les zones imperméabilisées 12. Les parties larges viennent en regard des zones imperméabilisées 12, sans toutefois toucher celles-ci, sauf de façon fortuite. En tout état de cause, le contact n'est pas nécessaire et n'est pas recherché. Les parties larges débordent légèrement des zones imperméabilisées 12 de sorte que leur contour repose également sur des fibres déjà déposées.The ribbon 1 is brought near the round shape 11 directly into the bath, here at the mark A, under the free surface of the latter, after the fibers have started to agglutinate against the round shape 11, and in particular 12. The narrow portions of the ribbon 1 thus rest on the fibers already agglutinated between the waterproofed zones 12. The wide portions are facing the sealed areas 12, without touching them, except fortuitously. In any case, the contact is not necessary and is not sought. The wide portions slightly protrude from the impervious zones 12 so that their outline also rests on already deposited fibers.

Puis les fibres continuent à s'agglomérer sur la forme ronde 11, pour recouvrir les parties étroites du ruban 1. Mais les fibres ne s'agglutinent pas sur les parties larges du ruban 1, sauf sur le contour de ces dernières. Le substrat fibreux ainsi produit est récupéré par une toile leveuse 20. Il comporte des fenêtres par lesquelles les parties larges du ruban 1 sont visibles de part et d'autre du substrat.Then the fibers continue to agglomerate on the round shape 11, to cover the narrow portions of the ribbon 1. But the fibers do not agglutinate on the broad parts of the ribbon 1, except on the contour of the latter. The fibrous substrate thus produced is recovered by a scrubbing cloth 20. It comprises windows by which wide portions of the ribbon 1 are visible on both sides of the substrate.

Un mode d'obtention des zones imperméabilisées utilisant un agent colmatant du type colle/résine selon le premier mode de réalisation consiste à enduire l'ensemble de la toile de la surface 11' avec une résine photosensible, qu'on vient insoler avec le rayonnement approprié au travers d'un film présentant des ouvertures correspondant aux contours des zones imperméabilisées que l'on souhaite obtenir. Après insolation, on retire le film, les zones qui ont été exposées aux rayonnements ont durci, tandis que les zones cachées par le film peuvent être éliminées facilement, généralement par rinçage à l'eau.A method of obtaining the waterproofed zones using a sealing agent of the glue / resin type according to the first embodiment consists in coating the entire fabric of the surface 11 'with a photoresist which is irradiated with the radiation. suitable through a film having openings corresponding to the contours of waterproofed areas that is desired. After exposure, the film is removed, the areas that have been exposed to the radiation have cured, while the areas hidden by the film can be easily removed, usually by rinsing with water.

Un second mode de réalisation de l'invention est représenté aux figures 4 et 5 selon deux variantes, qui ont en commun le fait que la surface support mobile 11' est une forme ronde en toile poreuse qui présente cette fois des embossages en creux 13 à la surface de ladite surface 11': les zones imperméabilisées sont alors formées par des matériaux 14a,14b comblant ces embossages en creux 13.A second embodiment of the invention is shown in Figures 4 and 5 according to two variants, which have in common that the movable support surface 11 'is a round shape made of porous fabric which this time has embossings in hollow 13 on the surface of said surface 11': the waterproofed zones are then formed by materials 14a, 14b filling these hollow embossings 13.

Selon la variante de la figure 4, le matériau comblant les embossages est constitué de plaques rapportées. Elles sont ici métalliques, mais peuvent, alternativement, être en matériau plastique. Dans cette variante, les plaques 14a sont soudées dans les embossages en creux 13, qui sont également de nature métallique. Mais alternativement, elles peuvent être collées ou cousues dans les embossages, ou solidarisées aux embossages par tout autre moyen approprié.According to the variant of the figure 4 the material filling the embossings consists of inserts. They are here metallic, but can alternatively be made of plastic material. In this variant, the plates 14a are welded in the hollow embossings 13, which are also of a metallic nature. But alternatively, they can be glued or sewn into the embossing, or secured to embossing by any other appropriate means.

Ces plaques 14a ont un contour sensiblement complémentaire de celui des embossages 13, et sont d'une épaisseur telle qu'elles viennent, une fois rapportées, affleurer au reste de la surface de la forme ronde 11, ou, à tout le moins, être légèrement saillantes par rapport à celle-ci (sans exclure le cas où elles sont, à l'inverse, légèrement en-deçà du reste de la surface de la forme ronde. Mais comme dans le premier mode de réalisation, on vise à obtenir des zones imperméabilisées pas ou peu saillantes. Et comme dans le mode de réalisation précédent, ces zones imperméabilisées ne sont pas destinées à rentrer en contact avec le ruban 1. On peut noter qu'on peut admettre une certaine tolérance dans le dimensionnement relatif et le positionnement relatif entre les embossages en creux et les plaques rapportées, tant que les plaques peuvent être insérées et fixées aux embossages, ce qui est, sur le plan industriel, avantageux.These plates 14a have a contour substantially complementary to that of the embossings 13, and are of a thickness such that they come, once reported, flush with the rest of the surface of the round shape 11, or, at the very least, be slightly protruding from it (without excluding the case where they are, conversely, slightly below the rest of the surface of the round shape. But as in the first embodiment, it is intended to obtain impregnated areas not or slightly protruding. And as in the previous embodiment, these waterproofed zones are not intended to come into contact with the ribbon 1. It may be noted that a certain tolerance can be allowed in the relative dimensioning and the relative positioning between the hollow embossings and the inserts, as long as the plates can be inserted and fixed to the embossings, which is, industrially, advantageous.

Selon la variante de la figure 5, les matériaux 14b comblant des embossages en creux sont à base de produit colmatant en résine. Comme dans le premier mode qui avait aussi recours à un matériau colmatant, celui-ci va imprégner au moins en partie la surface de la forme ronde poreuse 11' au niveau de ses embossages 13. La quantité de résine est choisie pour que la résine vienne affleurer à la surface 11' au voisinage des embossages, sachant qu'elle peut aussi être légèrement saillante ou légèrement en creux par rapport à ladite surface. La résine est avantageusement choisie de nature à pouvoir être coulée dans les embossages puis à sécher à l'air. On peut aussi la choisir photosensible, de façon à ce qu'elle durcisse/sèche sous l'effet de rayonnements, ultraviolets ou infrarouges par exemple.According to the variant of the figure 5 the materials 14b filling hollow embossings are based on clogging product resin. As in the first mode which also used a clogging material, it will impregnate at least part of the surface of the porous round shape 11 'at its embossings 13. The amount of resin is chosen for the resin to come flush with the surface 11 'in the vicinity of the embossings, knowing that it may also be slightly protruding or slightly recessed relative to said surface. The resin is advantageously chosen so that it can be cast in the embossings and then air dried. It can also be chosen photosensitive, so that it hardens / dries under the effect of radiation, ultraviolet or infrared, for example.

Les avantages de l'invention sont nombreux :

  • étant donné que l'étanchéité des zones imperméables n'est plus assurée par le ruban lui-même, il devient possible d'utiliser des rubans perforés ;
  • le contour des fenêtres n'est plus dicté au moins sur l'un des côtés par le flanc d'un embossage, et est donc plus progressif, assurant ainsi une meilleure cohésion entre le ruban est le substrat fibreux ;
  • la synchronisation entre la forme ronde et le déroulement du ruban peut être moins précise, puisqu'il suffit que les parties larges du ruban soient globalement en regard des zones imperméabilisées. Un écart est admissible, alors que dans le procédé de l'état de la technique, un écart aurait préjudicié à l'étanchéité de l'embossage ;
  • le ruban pénètre dans le bain, avant d'être intégré dans le substrat. Il est ainsi mouillé de part et d'autre, ce qui favorise la tenue des fibres sur le ruban, en particulier quand le ruban est avantageusement revêtu d'un agent d'adhésion activé par l'eau du bain ;
  • l'épaisseur à laquelle le ruban est inséré dans le substrat fibreux n'est plus dictée par la hauteur des embossages, mais uniquement par l'endroit d'introduction du ruban vis-à-vis de la forme ronde ;
  • l'agglutination de fibres entre les zones imperméabilisées préalablement à l'introduction du ruban permet de produire une couche homogène d'épaisseur constante et conduit à une grande cohésion des fibres déposées contre la forme ronde avant introduction du ruban. Dans le procédé de l'art antérieur précité, le ruban est en place avant le dépôt des fibres, et celles-ci doivent se frayer un chemin sous les parties étroites du ruban, c'est-à-dire dans une épaisseur ténue, ce qui peut conduire à des agglomérations de fibres peu solides dans ces régions.
  • Enfin, et c'est un avantage très notable également, la toile leveuse 20 exerce généralement une certaine pression sur l'ensemble papier-forme ronde au niveau de la liaison entre ces trois éléments, ceci afin de faciliter le transfert du papier d'une toile (celle de la forme ronde) vers l'autre (la toile leveuse 20). Or cette pression peut, quand il y a des éléments en relief sur la forme ronde, risquer de marquer la toile leveuse, ou encore risquer d'affaisser les reliefs quand ils se présentent sous forme d'embossages, ce qui peut conduire à devoir prévoir sur la forme ronde des renforts pour ceux-ci. Avec des éléments peu ou pas saillants conformes à l'invention, on supprime ce risque et ce besoin de renfort mécanique.
The advantages of the invention are numerous:
  • since the tightness of the impermeable zones is no longer ensured by the ribbon itself, it becomes possible to use perforated ribbons;
  • the outline of the windows is no longer dictated at least on one side by the side of an embossing, and is therefore more progressive, thus ensuring better cohesion between the ribbon is the fibrous substrate;
  • the synchronization between the round shape and the unwinding of the ribbon may be less precise, since it is sufficient for the wide parts of the ribbon to be generally facing the impregnated zones. A deviation is permissible, whereas in the prior art method, a gap would have prejudiced the sealing of the embossing;
  • the ribbon enters the bath, before being integrated into the substrate. It is thus wet on both sides, which promotes the holding of the fibers on the ribbon, in particular when the ribbon is advantageously coated with an adhesion agent activated by the bath water;
  • the thickness at which the ribbon is inserted into the fibrous substrate is no longer dictated by the height of the embossings, but only by the place of introduction of the ribbon vis-à-vis the round shape;
  • the agglutination of fibers between the zones impregnated prior to the introduction of the ribbon makes it possible to produce a homogeneous layer of constant thickness and leads to a great cohesion of the fibers deposited against the round shape before introduction of the ribbon. In the process of the aforementioned prior art, the tape is in place before the deposition of the fibers, and they must make their way under the narrow parts of the ribbon, that is to say in a thin thickness, this which can lead to weak fiber agglomerations in these areas.
  • Finally, and this is a very significant advantage as well, the scrubbing cloth 20 generally exerts a certain pressure on the round paper-shape assembly at the connection between these three elements, in order to facilitate the transfer of the paper of a canvas (that of the round shape) towards the other (the awning 20). But this pressure can, when there are elements in relief on the round shape, risk marking the tarpaulin, or risk to collapse the reliefs when they are in the form of embossings, which may lead to having to provide on the round form reinforcements for them. With little or no salient elements according to the invention, this risk and this need for mechanical reinforcement are eliminated.

L'invention n'est pas limitée à ce qui vient d'être décrit, mais englobe au contraire toute variante entrant dans le cadre défini par les revendications.The invention is not limited to what has just been described, but on the contrary covers any variant within the scope defined by the claims.

En particulier, bien que la surface support mobile soit ici une forme ronde, on pourra bien entendu utiliser tout autre type de surface mobile, comme une toile plane en défilement dans un bain.In particular, although the movable support surface is here a round shape, it will of course be possible to use any other type of moving surface, such as a flat canvas moving in a bath.

En outre, bien que l'on ait ici décrit l'invention comme utilisant un ruban à parties larges et parties étroites, on pourra plus généralement utiliser un ruban comportant des parties exposées destinées à rester visibles dans les fenêtres, reliées par des parties de pont. Ici, les parties de pont sont plus étroites que les parties exposées, pour permettre leur recouvrement par des fibres. Mais les parties de pont peuvent être de même largeur que les parties exposées, en étant perforées, de façon à permettre l'accumulation de fibres par-dessus les parties de pont.In addition, although the invention has been described here as using a ribbon with wide parts and narrow parts, it will more generally be possible to use a ribbon comprising exposed portions intended to remain visible in the windows, connected by bridge portions. . Here, the bridge portions are narrower than the exposed portions, to allow their overlap by fibers. But the bridge portions may be of the same width as the exposed parts, being perforated, so as to allow the accumulation of fibers over the bridge parts.

Claims (9)

Procédé de fabrication d'un substrat fibreux comportant des fenêtres, comprenant les étapes de : - faire défiler une surface support mobile (11) comportant des zones imperméabilisées peu ou pas saillantes (12) de ladite surface mobile dans un bain de solution fibreuse, et provoquer un agglutinement des fibres sur la surface support mobile ; - rapporter à proximité de la surface support mobile un ruban (1) comportant des parties exposées (3) et des parties de pont (2) de sorte que les parties exposées soient sensiblement en regard des zones imperméabilisées de la surface support mobile, le ruban étant introduit à proximité de la surface support mobile dans le bain, sous la surface libre de celui-ci, à un endroit pour lequel des fibres se sont déjà accumulées sur la surface du support mobile ; - continuer l'agglutinement des fibres de sorte que les fibres s'accumulent sur les parties de pont et sur un contour des parties exposées. A method of manufacturing a fibrous substrate having windows, comprising the steps of: - scrolling a movable support surface (11) having impervious areas of little or no protrusion (12) of said movable surface in a bath of fibrous solution, and cause agglutination of the fibers on the movable support surface; - bringing close to the moving support surface a ribbon (1) having exposed portions (3) and bridge portions (2) so that the exposed portions are substantially facing the impregnated areas of the movable support surface, the ribbon being introduced near the movable support surface in the bath, beneath the free surface thereof, at a location for which fibers have already accumulated on the surface of the movable support; - Continuing the agglutination of the fibers so that the fibers accumulate on the bridge parts and on an outline of the exposed parts. Procédé selon la revendication 1, dans lequel la surface support mobile est une forme ronde poreuse (11), les zones imperméabilisées (12) étant formées sur la toile à l'aide d'un produit colmatant.The method of claim 1, wherein the movable support surface is a porous round shape (11), the impregnated areas (12) being formed on the fabric with a sealant. Procédé selon la revendication 1, dans lequel la surface support mobile est une forme ronde poreuse (11), les zones imperméabilisées (12) étant formées par des matériaux (14a,14b) comblant des embossages en creux (13) à la surface de ladite forme (11').The method of claim 1, wherein the movable support surface is a porous round shape (11), the impregnated areas (12) being formed by materials (14a, 14b) filling hollow embossings (13) on the surface of said form (11 '). Procédé selon la revendication précédente, dans lequel les matériaux comblant des embossages en creux (13) sont des plaques rapportées (14a).Method according to the preceding claim, wherein the materials filling hollow embossings (13) are inserts (14a). Procédé selon la revendication précédente, dans lequel les plaques rapportées (14a) sont en métal ou en matériau plastique.Method according to the preceding claim, wherein the inserts (14a) are made of metal or made of plastic material. Procédé selon la revendication 4 ou la revendication 5, caractérisé en ce que les plaques rapportées (14a) sont collées, soudées ou cousues dans les embossages en creux (13) de la forme ronde poreuse (11').A method according to claim 4 or claim 5, characterized in that the insert plates (14a) are glued, welded or sewn into the hollow embossings (13) of the porous round shape (11 '). Procédé selon la revendication 3, dans lequel les matériaux comblant des embossages en creux (13) sont à base de produit colmatant en résine (14b).A process according to claim 3, wherein the materials filling hollow embossings (13) are based on resin sealant (14b). Procédé selon l'une des revendications 2 ou 7, dans lequel le produit colmatant imprègne au moins en partie la surface de la forme ronde poreuse (11,11').Method according to one of claims 2 or 7, wherein the clogging product impregnates at least part of the surface of the porous round shape (11,11 '). Procédé selon l'une des revendications précédentes, dans lequel le ruban comporte des parties étroites (2) formant les parties de pont, et des portions larges (3) formant les parties exposées.Method according to one of the preceding claims, wherein the tape has narrow portions (2) forming the bridge portions, and wide portions (3) forming the exposed portions.
EP09290926A 2008-12-22 2009-12-10 Method of manufacturing a fibrous web with a window Active EP2202354B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200930370T SI2202354T1 (en) 2008-12-22 2009-12-10 Method of manufacturing a fibrous web with a window
PL09290926T PL2202354T3 (en) 2008-12-22 2009-12-10 Method of manufacturing a fibrous web with a window

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0807376A FR2940328B1 (en) 2008-12-22 2008-12-22 PROCESS FOR PRODUCING A FIBROUS WINDOW SUBSTRATE

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EP2202354A1 true EP2202354A1 (en) 2010-06-30
EP2202354B1 EP2202354B1 (en) 2012-09-12

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ES (1) ES2392918T3 (en)
FR (1) FR2940328B1 (en)
MA (1) MA31558B1 (en)
PL (1) PL2202354T3 (en)
RU (1) RU2431711C2 (en)
SI (1) SI2202354T1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN104611976A (en) * 2015-01-04 2015-05-13 昆山钞票纸业有限公司 Cylinder mould with watermark supporting structure and anti-counterfeiting paper manufactured through same
CN106283812A (en) * 2016-08-24 2017-01-04 西安兴晟造纸不锈钢网有限公司 The manufacture method of cheque paper

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US4462866A (en) * 1981-02-19 1984-07-31 Portals Limited Sheet materials
EP0549384A1 (en) * 1991-12-09 1993-06-30 Arjo Wiggins S.A. Method of manufacturing paper comprising reduced thickness and transparently in local zones and the paper obtained therefrom
WO2003025281A1 (en) * 2001-09-17 2003-03-27 Giesecke & Devrient Gmbh Papermaking mould for producing two-stage watermarks and a method for producing the same
FR2898365A1 (en) 2006-03-13 2007-09-14 Banque De France SHEET OF FIBROUS MATERIAL COMPRISING A TRANSPARENT WINDOW AND METHOD OF MAKING SAME
WO2009109682A1 (en) * 2008-03-07 2009-09-11 Fabrica Nacional De Moneda Y Timbre - Real Casa De La Moneda Security paper, production method thereof and security document produced from same

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US4462866A (en) * 1981-02-19 1984-07-31 Portals Limited Sheet materials
EP0549384A1 (en) * 1991-12-09 1993-06-30 Arjo Wiggins S.A. Method of manufacturing paper comprising reduced thickness and transparently in local zones and the paper obtained therefrom
WO2003025281A1 (en) * 2001-09-17 2003-03-27 Giesecke & Devrient Gmbh Papermaking mould for producing two-stage watermarks and a method for producing the same
FR2898365A1 (en) 2006-03-13 2007-09-14 Banque De France SHEET OF FIBROUS MATERIAL COMPRISING A TRANSPARENT WINDOW AND METHOD OF MAKING SAME
WO2009109682A1 (en) * 2008-03-07 2009-09-11 Fabrica Nacional De Moneda Y Timbre - Real Casa De La Moneda Security paper, production method thereof and security document produced from same

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Publication number Priority date Publication date Assignee Title
CN104611976A (en) * 2015-01-04 2015-05-13 昆山钞票纸业有限公司 Cylinder mould with watermark supporting structure and anti-counterfeiting paper manufactured through same
CN106283812A (en) * 2016-08-24 2017-01-04 西安兴晟造纸不锈钢网有限公司 The manufacture method of cheque paper
CN106283812B (en) * 2016-08-24 2018-03-16 西安兴晟造纸不锈钢网有限公司 The manufacture method of cheque paper

Also Published As

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FR2940328A1 (en) 2010-06-25
EP2202354B1 (en) 2012-09-12
SI2202354T1 (en) 2012-12-31
RU2009147502A (en) 2011-06-27
FR2940328B1 (en) 2016-07-08
MA31558B1 (en) 2010-08-02
PL2202354T3 (en) 2013-01-31
RU2431711C2 (en) 2011-10-20
ES2392918T3 (en) 2012-12-17

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