EP2069136B1 - Process and installation for combining plies forming an absorbent sheet - Google Patents

Process and installation for combining plies forming an absorbent sheet Download PDF

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Publication number
EP2069136B1
EP2069136B1 EP07848268A EP07848268A EP2069136B1 EP 2069136 B1 EP2069136 B1 EP 2069136B1 EP 07848268 A EP07848268 A EP 07848268A EP 07848268 A EP07848268 A EP 07848268A EP 2069136 B1 EP2069136 B1 EP 2069136B1
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EP
European Patent Office
Prior art keywords
cylinder
series
small
cylinders
engraved
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EP07848268A
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German (de)
French (fr)
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EP2069136A2 (en
Inventor
Sébastien Jeannot
Benoît Hoeft
Pierre Probst
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Essity Operations France SAS
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Georgia Pacific France SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/07—Embossing, i.e. producing impressions formed by locally deep-drawing, e.g. using rolls provided with complementary profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0784—Auxiliary operations
    • B31F2201/0789—Joining plies without adhesive

Definitions

  • the present invention relates to the field of absorbent papers based on cellulose wadding, for sanitary or domestic use such as toilet paper, towels or any paper wiping, napkins ...
  • cellulose wadding also known as tissue paper
  • tissue paper is a low weight absorbent paper, between 10 and 45 g / m 2 , obtained wet from paper fibers. It includes, possibly, chemical additives in small proportions, according to the use for which it is intended. It can be obtained by pressing the still wet sheet on a heated cylinder of large diameter, on which it is dried and from which it is then detached by means of a metal blade applied against it, transversely to its direction of rotation. This operation is intended to crepe the sheet which then has transverse corrugations to its direction walk. The crepe gives the sheet a certain elasticity at the same time as it increases its thickness and gives it tactile properties.
  • Another known method of manufacture comprises a first step of drying the sheet, at least in part, by means of a stream of hot air therethrough. This can then be creped or not.
  • the sheet thus manufactured is then transformed into another distinct phase of production known as transformation or conversion and associated with other sheets then called folds to form the final absorbent paper product.
  • the association can be of a chemical nature by gluing, for example, or of a mechanical nature.
  • the known methods consist in depositing a film of glue on all or part of the surface of one of the plies, and then in contacting the glued surface with the surface of at least one other ply.
  • the combination of the folds can be performed by knurling or by compression, in the conversion or conversion phase.
  • Knurling conventionally consists in compressing the folds to be associated between a wheel (or engraved wheel, provided with elements in relief) and a smooth cylinder.
  • Each knurled band corresponds to the width of a wheel.
  • the bands can form decorative strips on the sheet.
  • association by knurling is limited when it is desired to make patterns across the width of a width. Indeed, even if a large number of knurls are arranged side by side (thus creating a large number of bands) there may be areas without knurling.
  • the document EP 1 362 953 illustrates a particular example of an installation and method using knurling.
  • the major difference with respect to the basic method described above is that the combination of folds takes place in wide parallel bands (machine running direction) on the sheet, and in that one applies a film of additive such as oil on at least one of the faces of the sheet to obtain watermarking simultaneously with the combination.
  • the knurling generally creates problems of legibility of the embossed pattern if it exists, because, in known manner, the knurling overwrites the embossing patterns already formed on the sheet.
  • EP 1,533,112 or EP 0 672 402 which describe methods and installations for combining several folds made of cellulose wadding, according to which the combination is produced by knurling the folds which pass between at least one series of rolls engraved in different patterns and a pressure cylinder or cylinder marryer, under a certain pressure.
  • the subject of the present invention is a method of association without glue, by pressure marking of at least two plies based on cellulose wadding, characterized in that it consists of embossing in an embossing pattern at least a first fold by passage between a first cylinder and a cylinder externally covered with a rubber, then to associate at least one second fold with said first fold by passing said folds between a first engraved steel cylinder of axis CC 'and at least one first series of small coaxial cylinders externally smooth axis XX ', then between said first cylinder and a second series of small coaxial cylinders externally smooth axes YY', the axes CC ', XX' and YY 'being horizontal and parallel.
  • the association is operated according to all or part of the embossing pattern and / or engraving of the engraved cylinder, uniformly over the entire width of the folds to be associated.
  • the small cylinders of each series are axially spaced from each other by a distance substantially equal to their width, and arranged in a staggered sequence from one series to another, so that a width of recovery in the cross direction is between 0.1 mm and about 10 mm, preferably 1 mm, is carried out.
  • This characteristic makes it possible to obtain a regularly distributed association, very uniform throughout the width of a log, even if it is relatively large.
  • At least one of the plies is embossed individually prior to the association.
  • At least one of the plies is not embossed before the association.
  • the axes XX 'and YY' are angularly spaced from an angle ⁇ measured along the axis CC ', between 10 ° and 180 °.
  • the folds pass under a third series of small smooth cylinders cooperating with said engraved cylinder.
  • the plies to be associated are pressed against the engraved cylinder during and between all the steps of the association.
  • the rubber cylinder, the first cylinder and the small cylinders are respectively positioned and adjusted so that the contact between the first engraved cylinder and each of the small smooth cylinders is made under a specific pressure of between about 40 and about 250 N / mm 2 .
  • the invention further relates to the installation for implementing the method, as protected by claims 11 to 14 defined below.
  • the combination of plies based on cellulose wadding is essentially achieved through their successive passage between a first series of rollers or small smooth cylinders 1 and an engraved cylinder 2 at a first "nip", then between a second series of rollers or small smooth rollers 3 and said engraved roll 2.
  • the engraved cylinder 2 may be externally constituted of a steel and has for example a diameter of about 600 mm, and a length of 2700 mm, or even 3400 mm.
  • the engraved cylinder 2 can be externally hardened.
  • a hardness rubber of for example between 40 and 80 ShA (Shore A hardness) is used.
  • All cylinders 1, 2, 3, 4 have axes of rotation parallel to each other, horizontal.
  • the small cylinders (or wheels) 1, 3 can be made of hardened steel.
  • the cylinders and series of cylinders are arranged as illustrated on the figure 1 the axes (respectively CC 'and AA') of the engraved cylinders 2, and of rubber 4 belonging substantially to the same horizontal plane, while the axes of rotation XX 'and YY' of the small cylinders 1, 3 are angularly spaced from an angle ⁇ measured along the axis CC 'of the engraved cylinder.
  • the angle ⁇ may be between 10 ° and 180 °, preferably between 90 and 150 °.
  • the series of small cylinders 1, 3 are arranged in a sector opposite to that to which the rubber cylinder 4 belongs, so that an equilibrium of forces applied to the engraved cylinder is generally and easily realized.
  • a first fold (or group of folds) 5 is embossed between the rubber roll 4 and the engraved roll 2.
  • the embossing patterns may advantageously be any, continuous, uniform or not along the width.
  • the embossing patterns can be chosen without constraint by the manufacturer.
  • a second fold or group of folds 6 can also be brought (by any means known per se and not shown) into the nip between the engraved roll 2 and the first set of rollers 1, where it is associated with the first fold (or group folds) 5.
  • the small smooth cylinders 3 being transversely offset vis-à-vis the small cylinders 1, as visible on the figures 2 and 3 Thus, an association is made on the entire surface of the width.
  • an axial zone of overlap (e) surfaces covered by the wheels is provided as illustrated by the diagram of the figure 3 .
  • a covering width (e) more specifically recommended is at least 0.1 mm and preferably about 1 mm. It can reasonably be between 0.1 and 10 mm.
  • This particular offset ensures the association across the width of the width without any unassociated area and with a certain tolerance for the positioning of each of the small cylinders.
  • a better visibility of the embossing pattern at the association zones is observed because the pressure exerted between the engraved cylinder 2 and the small cylinders 1, 3 at the time of the combination creates a watermarking paper.
  • the embossing pattern may be uniform across the width, at one or more levels, or different in parallel stripes.
  • the second fold (or group of folds) 6 can be embossed or not, creped or not when it joins the first fold 5 at the nip between the engraved cylinder 2 and the first series of small cylinder 1.
  • the defects in geometry of the engraved cylinder 2 and / or the wheels 1, 3 are compensated by the use of individually adjustable wheels: more precisely the support force of each wheel 1, 3 against the engraved cylinder 2 can be set as well as its position on one of the axes XX 'or YY'.
  • Each wheel can be moved along its axis of rotation (XX ', YY') to adjust the overlap width (e) above.
  • the axes AA 'and CC' of the cylinders 2 and 4 may belong not to a horizontal plane but to a vertical or substantially vertical plane.
  • the arrangement of the main elements required for the invention advantageously allows the use of the same engraved cylinder 2 at a time for the embossing of at least one ply and for the association by marking of several plies.
  • the knurls can be distributed over more than two axes of rotation, the axes being arranged around the engraved cylinder 2 so as to balance the forces acting on the cylinder 2.
  • toilet paper sheets consisting of two plies of cellulose wadding type CWP (Conventional Wet Press) total weight equal to 42 g / m 2 .
  • One of the plies is embossed before the association, by a microgaufrage comprising more than 30 protuberances / cm 2 ; the other ply is embossed between the cylinders 4 and 2 with a pattern comprising a regular network of large and small protuberances: the large protuberances being aligned and forming rhombs within which the small protuberances are arranged with a high density.
  • the two plies are associated through two sets of knobs 1, 3, each wheel of each series having a width of 80 mm; the wheels 1 are offset with respect to the rollers 3 so that there is a covering (e) of about 1 mm.
  • the engraved cylinder 2 has been externally hardened and has an external hardness of 57 HRC (Rockwell hardness known to those skilled in the art).
  • the smooth wheels are externally hardened and have a hardness of 2 to 20 HRC lower than that of the engraved cylinder 2.
  • the smooth wheels 1, 3 may have an external hardness of 47 HRC.
  • the speeds of scrolling folds, at the level of the association, can be of the order of 450 m / min, or even more depending on the type of manufacture.

Abstract

The present invention relates to a method for the combination of at least two plies of tissue paper without glue and by pressure marking, characterized in that it involves embossing at least one first ply according to an embossing design by passage between a first cylinder and a second cylinder covered externally with a rubber blanket, then combining at least one second ply with the first ply by causing both plies to pass between the first engraved steel cylinder of axis CC′ and at least one first series of small externally smooth coaxial cylinders of axis XX′. Both plies are then passed between the first cylinder and a second series of small externally smooth coaxial cylinders of axis YY′, the axes of CC′, XX′; and YY′ being horizontal and parallel. The invention also includes the apparatus for carrying out the disclosed method.

Description

La présente invention concerne le domaine des papiers absorbants à base d'ouate de cellulose, à usage sanitaire ou domestique tels que le papier hygiénique, les essuie-mains ou tout papier d'essuyage, les serviettes de table ...The present invention relates to the field of absorbent papers based on cellulose wadding, for sanitary or domestic use such as toilet paper, towels or any paper wiping, napkins ...

Pour la réalisation de tels produits, on utilise généralement l'ouate de cellulose appelée également papier tissue. Il s'agit d'un papier absorbant de faible grammage, compris entre 10 et 45 g/m2, obtenu par voie humide à partir de fibres papetières. Il comprend, éventuellement, des additifs chimiques dans de faibles proportions, selon l'usage auquel il est destiné. Il peut être obtenu par pressage de la feuille encore humide sur un cylindre chauffé de grand diamètre, sur lequel elle est séchée et dont elle est détachée ensuite au moyen d'une lame métallique appliquée contre celui-ci, transversalement à son sens de rotation. Cette opération a pour but de crêper la feuille qui présente alors des ondulations transversales à son sens marche. Le crêpage confère une certaine élasticité à la feuille en même temps qu'il en augmente l'épaisseur et lui procure des propriétés tactiles.For the production of such products, cellulose wadding, also known as tissue paper, is generally used. It is a low weight absorbent paper, between 10 and 45 g / m 2 , obtained wet from paper fibers. It includes, possibly, chemical additives in small proportions, according to the use for which it is intended. It can be obtained by pressing the still wet sheet on a heated cylinder of large diameter, on which it is dried and from which it is then detached by means of a metal blade applied against it, transversely to its direction of rotation. This operation is intended to crepe the sheet which then has transverse corrugations to its direction walk. The crepe gives the sheet a certain elasticity at the same time as it increases its thickness and gives it tactile properties.

Un autre mode de fabrication connu comprend une première étape de séchage de la feuille, au moins en partie, au moyen d'un courant d'air chaud la traversant. Celle-ci peut ensuite être crêpée ou non.Another known method of manufacture comprises a first step of drying the sheet, at least in part, by means of a stream of hot air therethrough. This can then be creped or not.

De manière générale, la feuille ainsi fabriquée est ensuite transformée dans une autre phase distincte de fabrication dite de transformation ou converting et associée à d'autres feuilles alors dénommées plis pour former le produit final en papier absorbant.In general, the sheet thus manufactured is then transformed into another distinct phase of production known as transformation or conversion and associated with other sheets then called folds to form the final absorbent paper product.

En effet, lorsque l'on souhaite conférer des propriétés particulières à une feuille telle que l'épaisseur, la douceur, le gonflant, on peut choisir d'associer plusieurs plis entre eux.Indeed, when it is desired to confer particular properties on a sheet such as thickness, softness, swelling, one can choose to associate several plies between them.

L'association peut être de nature chimique par collage par exemple, ou bien de nature mécanique.The association can be of a chemical nature by gluing, for example, or of a mechanical nature.

Concernant le collage les procédés connus consistent à déposer un film de colle sur tout ou partie de la surface de l'un des plis, puis à mettre en contact la surface encollée avec la surface d'au moins un autre pli.As regards bonding, the known methods consist in depositing a film of glue on all or part of the surface of one of the plies, and then in contacting the glued surface with the surface of at least one other ply.

Ce type d'association nécessite un équipement spécifique, additionnel dans la chaîne de fabrication ce qui représente un coût, des difficultés techniques supplémentaires. En outre, la colle en elle-même est chère, encrasse les cylindres de l'unité de gaufrage et peut induire une rigidité supplémentaire, non souhaitée, sur le produit final dont la douceur sera par ailleurs diminuée par la présence de la colle. Ces inconvénients ont amené certains fabricants à se tourner vers des associations de type mécanique.This type of association requires specific equipment, additional in the production line which represents a cost, additional technical difficulties. In addition, the glue itself is expensive, clogs the cylinders of the embossing unit and may induce additional undesired stiffness on the final product whose softness will be by elsewhere diminished by the presence of glue. These disadvantages have led some manufacturers to turn to mechanical type associations.

Dans ce cas, l'association des plis peut être réalisée par moletage ou par compression, en phase de transformation ou converting.In this case, the combination of the folds can be performed by knurling or by compression, in the conversion or conversion phase.

Le moletage consiste classiquement à comprimer les plis à associer entre une molette (ou roue gravée, pourvue d'éléments en relief) et un cylindre lisse.Knurling conventionally consists in compressing the folds to be associated between a wheel (or engraved wheel, provided with elements in relief) and a smooth cylinder.

Chaque bande moletée correspond donc à la largeur d'une molette. Les bandes peuvent former des bandes décoratives sur la feuille.Each knurled band corresponds to the width of a wheel. The bands can form decorative strips on the sheet.

A titre illustratif le brevet US 3,377,224 décrit un papier « tissue » réalisé par un tel procédé. Etant donné qu'une largeur très limitée de papier est moletée, un inconvénient notable réside dans la délamination des zones non moletées.As an illustration, the patent US 3,377,224 describes a "tissue" paper made by such a method. Since a very limited width of paper is knurled, a significant disadvantage lies in the delamination of the non-knurled areas.

En outre, l'association par moletage est limitée lorsque l'on souhaite réaliser des motifs sur toute la largeur d'une laize. En effet, même si un nombre important de molettes sont disposées côte à côte (créant ainsi un grand nombre de bandes) il peut subsister des zones sans moletage.In addition, the association by knurling is limited when it is desired to make patterns across the width of a width. Indeed, even if a large number of knurls are arranged side by side (thus creating a large number of bands) there may be areas without knurling.

Le document EP 1 362 953 illustre un exemple particulier d'installation et de procédé utilisant le moletage. La différence majeure vis-à-vis du procédé basique décrit ci-avant réside en ce que l'association des plis a lieu selon de larges bandes parallèles (sens marche de la machine) sur la feuille, et en ce que l'on applique une pellicule d'additif tel que de l'huile sur l'une au moins des faces de la feuille afin d'obtenir un filigranage simultanément à l'association.The document EP 1 362 953 illustrates a particular example of an installation and method using knurling. The major difference with respect to the basic method described above is that the combination of folds takes place in wide parallel bands (machine running direction) on the sheet, and in that one applies a film of additive such as oil on at least one of the faces of the sheet to obtain watermarking simultaneously with the combination.

Par ailleurs, le moletage crée globalement des problèmes de lisibilité du motif gaufré s'il existe, car, de façon connue, le moletage écrase les motifs de gaufrage déjà formés sur la feuille.Moreover, the knurling generally creates problems of legibility of the embossed pattern if it exists, because, in known manner, the knurling overwrites the embossing patterns already formed on the sheet.

En outre, dans le cas où un nombre important de molettes est utilisé, le réglage et/ou le calage des molettes rend la production difficile et complexe.In addition, in the case where a large number of knurls is used, the adjustment and / or setting of the knurls makes production difficult and complex.

On connaît aussi le document EP 1 533 112 ou encore EP 0 672 402 qui décrivent des procédés et installations d'association de plusieurs plis en ouate de cellulose, selon lesquels l'association est réalisée par moletage des plis qui passent entre au moins une série de molettes gravées selon différents motifs et un contre-cylindre de pression ou cylindre marieur, sous une certaine pression.The document is also known EP 1,533,112 or EP 0 672 402 which describe methods and installations for combining several folds made of cellulose wadding, according to which the combination is produced by knurling the folds which pass between at least one series of rolls engraved in different patterns and a pressure cylinder or cylinder marryer, under a certain pressure.

Ces solutions sont intéressantes mais engendrent des problèmes notamment au niveau des zones (bandes) entre les molettes car encore une fois la feuille n'ayant pas été comprimée les plis qui la constituent ne sont pas associés dans ces zones. Les feuilles présentent donc des bandes plus ou moins larges non associées et dépourvues de motifs.These solutions are interesting but cause problems especially in the areas (bands) between the wheels because once again the sheet has not been compressed folds that constitute it are not associated in these areas. The leaves therefore have more or less broad bands that are not associated and lack motives.

De plus ces solutions antérieures induisent des contraintes au niveau des motifs de gravure des molettes dès que l'on souhaite réaliser un motif uniforme sur toute la laize du cylindre.In addition, these prior solutions induce constraints on the engraving patterns of the rollers as soon as it is desired to produce a uniform pattern over the entire width of the roll.

En effet après une telle association les rouleaux (ou log) obtenus étant découpés pour former les rouleaux finaux (d'essuie-tout, de papier toilette ou autre destination), si des discontinuités (ou absence) de gravures sont présentes, la coupe doit impérativement être réalisée dans les discontinuités ce qui nécessite des réglages et tolérances très fins de l'outil de coupe.Indeed after such an association the rolls (or log) obtained being cut to form the final rolls (paper towels, toilet paper or other destination), if discontinuities (or absence) of engravings are present, the cut should It must be done in the discontinuities which requires very fine adjustments and tolerances of the cutting tool.

Un besoin existe donc pour une production industrielle aisée et rapide de feuilles multi plis en ouate de cellulose, associées par marquage et sans collage.A need therefore exists for easy and fast industrial production of multi-ply sheets of cellulose wadding, associated by marking and without bonding.

La présente invention a pour objet un procédé d'association sans colle, par marquage par pression d'au moins deux plis à base d'ouate de cellulose, caractérisé en ce qu'il consiste à gaufrer selon un motif de gaufrage au moins un premier pli par passage entre un premier cylindre et un cylindre extérieurement recouvert d'un caoutchouc, puis à associer au moins un deuxième pli avec ledit premier pli en faisant passer lesdits plis entre un premier cylindre en acier gravé d'axe CC' et au moins une première série de petits cylindres coaxiaux extérieurement lisses d'axe XX', puis entre ledit premier cylindre et une deuxième série de petits cylindres coaxiaux extérieurement lisses d'axes YY', les axes CC', XX' et YY' étant horizontaux et parallèles.The subject of the present invention is a method of association without glue, by pressure marking of at least two plies based on cellulose wadding, characterized in that it consists of embossing in an embossing pattern at least a first fold by passage between a first cylinder and a cylinder externally covered with a rubber, then to associate at least one second fold with said first fold by passing said folds between a first engraved steel cylinder of axis CC 'and at least one first series of small coaxial cylinders externally smooth axis XX ', then between said first cylinder and a second series of small coaxial cylinders externally smooth axes YY', the axes CC ', XX' and YY 'being horizontal and parallel.

On réalise ainsi une association de plusieurs plis, de bonne qualité, d'une façon simple, fiable et avec une vitesse de production intéressante.Thus, a combination of several plies, of good quality, is made in a simple, reliable manner and with an interesting production speed.

L'association est opérée selon tout ou partie du motif de gaufrage et/ou de gravure du cylindre gravé, de façon uniforme sur toute la laize des plis à associer.The association is operated according to all or part of the embossing pattern and / or engraving of the engraved cylinder, uniformly over the entire width of the folds to be associated.

Conformément à l'invention, les petits cylindres de chaque série sont axialement éloignés les uns des autres d'une distance sensiblement égale à leur largeur, et disposés en quinconce d'une série à l'autre, de telle sorte qu'une largeur de recouvrement selon le sens travers soit comprise entre 0,1 mm et environ 10 mm, préférentiellement de 1 mm, soit réalisée.According to the invention, the small cylinders of each series are axially spaced from each other by a distance substantially equal to their width, and arranged in a staggered sequence from one series to another, so that a width of recovery in the cross direction is between 0.1 mm and about 10 mm, preferably 1 mm, is carried out.

Cette caractéristique permet d'obtenir une association régulièrement répartie, très uniforme sur toute la laize d'un log, même si celle-ci est relativement grande.This characteristic makes it possible to obtain a regularly distributed association, very uniform throughout the width of a log, even if it is relatively large.

Aucun pli, ni aucun décollement n'est observé sur la laize produite. La découpe des rouleaux est de ce fait moins délicate car elle nécessite moins de précision. Ainsi une production à une vitesse plus importante que dans l'art antérieur peut être réalisée.No crease or peeling is observed on the width produced. The cutting of the rolls is therefore less delicate because it requires less precision. Thus production at a higher speed than in the prior art can be achieved.

Selon un mode particulier de réalisation de l'invention, l'un au moins des plis est gaufré individuellement préalablement à l'association.According to a particular embodiment of the invention, at least one of the plies is embossed individually prior to the association.

Sans sortir du cadre de l'invention, l'un au moins des plis n'est pas gaufré avant l'association.Without departing from the scope of the invention, at least one of the plies is not embossed before the association.

Par ailleurs, les axes XX' et YY' sont angulairement écartés d'un angle α mesuré selon l'axe CC', compris entre 10° et 180°.Furthermore, the axes XX 'and YY' are angularly spaced from an angle α measured along the axis CC ', between 10 ° and 180 °.

Avantageusement, les plis passent sous une troisième série de petits cylindres lisses coopérant avec ledit cylindre gravé.Advantageously, the folds pass under a third series of small smooth cylinders cooperating with said engraved cylinder.

De façon intéressante, tout ou partie des petits cylindres sont réglables individuellement en pression contre le cylindre gravé et/ou, en positionnement axial et/ou « pseudo axial » comme il sera explicité ci-après.Interestingly, all or part of the small cylinders are individually adjustable in pressure against the engraved cylinder and / or, in axial positioning and / or "pseudo axial" as will be explained below.

Cette modularité et ce réglage individuel des molettes (ou petits cylindres) permet de répartir uniformément les charges le long de la laize quelle que soit sa dimension et notamment lorsque le cylindre gravé présente une flèche au centre.This modularity and this individual adjustment of the knobs (or small cylinders) makes it possible to evenly distribute the loads along the width regardless of its size and especially when the engraved cylinder has an arrow in the center.

De façon avantageuse, les plis à associer sont plaqués contre le cylindre gravé pendant et entre toutes les étapes de l'association.Advantageously, the plies to be associated are pressed against the engraved cylinder during and between all the steps of the association.

Par ailleurs, le cylindre caoutchouc, le premier cylindre et les petits cylindres, sont respectivement positionnés et réglés de telle sorte que le contact entre le premier cylindre gravé et chacun des petits cylindres lisses est réalisé sous une pression spécifique comprise entre environ 40 et environ 250 N/mm2.Furthermore, the rubber cylinder, the first cylinder and the small cylinders are respectively positioned and adjusted so that the contact between the first engraved cylinder and each of the small smooth cylinders is made under a specific pressure of between about 40 and about 250 N / mm 2 .

L'invention concerne en outre l'installation destinée à mettre en oeuvre le procédé, telle que protégée par les revendications 11 à 14 définies ci-après.The invention further relates to the installation for implementing the method, as protected by claims 11 to 14 defined below.

D'autres caractéristiques, détails et avantages de l'invention apparaîtront mieux à la lecture de la description qui va suivre, faite à titre illustratif et nullement limitatif en référence aux dessins annexés sur lesquels :

  • la figure 1 est un schéma de principe montrant des principaux éléments susceptibles de mettre en oeuvre le procédé selon l'invention ;
  • la figure 2 est un dessin en perspective montrant les positions respectives du cylindre gravé, des molettes lisses et du contre-cylindre, selon un mode de réalisation de l'invention.
Other characteristics, details and advantages of the invention will appear better on reading the following description, given by way of illustration and in no way limiting, with reference to the appended drawings in which:
  • the figure 1 is a block diagram showing main elements capable of implementing the method according to the invention;
  • the figure 2 is a perspective drawing showing the respective positions of the engraved cylinder, the smooth wheels and the counter cylinder, according to one embodiment of the invention.

Ainsi, selon le schéma de la figure 1, l'association des plis à base d'ouate de cellulose est essentiellement réalisée grâce à leur passage successif entre une première série de molettes ou petits cylindres lisses 1 et un cylindre gravé 2 au niveau d'un premier « nip », puis entre une deuxième série de molettes ou petits cylindres lisses 3 et ledit cylindre gravé 2.So, according to the scheme of the figure 1 , the combination of plies based on cellulose wadding is essentially achieved through their successive passage between a first series of rollers or small smooth cylinders 1 and an engraved cylinder 2 at a first "nip", then between a second series of rollers or small smooth rollers 3 and said engraved roll 2.

Le cylindre gravé 2 peut être extérieurement constitué d'un acier et présente par exemple un diamètre d'environ 600 mm, et une longueur de 2700 mm, voire 3400 mm.The engraved cylinder 2 may be externally constituted of a steel and has for example a diameter of about 600 mm, and a length of 2700 mm, or even 3400 mm.

Sans sortir du cadre de l'invention, le cylindre gravé 2 peut être extérieurement durci.Without departing from the scope of the invention, the engraved cylinder 2 can be externally hardened.

Un autre cylindre 4 extérieurement revêtu de caoutchouc est en outre prévu. Un caoutchouc de dureté comprise par exemple entre 40 et 80 ShA (dureté Shore A) est utilisé.Another cylinder 4 externally coated with rubber is further provided. A hardness rubber of for example between 40 and 80 ShA (Shore A hardness) is used.

Tous les cylindres 1, 2, 3, 4 présentent des axes de rotation parallèles entre eux, horizontaux.All cylinders 1, 2, 3, 4 have axes of rotation parallel to each other, horizontal.

Par ailleurs les petits cylindres (ou molettes) 1, 3 peuvent être réalisés en acier durci.Moreover, the small cylinders (or wheels) 1, 3 can be made of hardened steel.

Avantageusement, les cylindres et séries de cylindres sont disposés comme illustré sur la figure 1, les axes (respectivement CC' et AA') des cylindres gravés 2, et en caoutchouc 4 appartenant sensiblement à un même plan horizontal, tandis que les axes de rotation XX' et YY' des petits cylindres 1, 3 sont angulairement écartés d'un angle α mesuré selon l'axe CC' du cylindre gravé.Advantageously, the cylinders and series of cylinders are arranged as illustrated on the figure 1 the axes (respectively CC 'and AA') of the engraved cylinders 2, and of rubber 4 belonging substantially to the same horizontal plane, while the axes of rotation XX 'and YY' of the small cylinders 1, 3 are angularly spaced from an angle α measured along the axis CC 'of the engraved cylinder.

L'angle α peut être compris entre 10° et 180°, préférentiellement entre 90 et 150°.The angle α may be between 10 ° and 180 °, preferably between 90 and 150 °.

Les séries de petits cylindres 1, 3 sont disposés dans un secteur opposé à celui auquel appartient le cylindre en caoutchouc 4, de sorte qu'un équilibre des forces appliquées au cylindre gravé est globalement et aisément réalisé.The series of small cylinders 1, 3 are arranged in a sector opposite to that to which the rubber cylinder 4 belongs, so that an equilibrium of forces applied to the engraved cylinder is generally and easily realized.

Selon le mode de réalisation illustré à la figure 1, un premier pli (ou groupe de plis) 5 est gaufré entre le cylindre caoutchouc 4 et le cylindre gravé 2.According to the embodiment illustrated in figure 1 a first fold (or group of folds) 5 is embossed between the rubber roll 4 and the engraved roll 2.

Comme il sera davantage explicité ci-après, les motifs de gaufrage peuvent avantageusement être quelconques, continus, uniformes ou non le long de la laize. Autrement dit les motifs de gaufrage peuvent être choisis sans contrainte par le fabricant.As will be further explained below, the embossing patterns may advantageously be any, continuous, uniform or not along the width. In other words the embossing patterns can be chosen without constraint by the manufacturer.

Un deuxième pli ou groupe de plis 6 peut en outre être amené (par tout moyen connu en soi et non représenté) dans le nip entre le cylindre gravé 2 et la première série de molettes 1, où il est associé au premier pli (ou groupe de plis) 5.A second fold or group of folds 6 can also be brought (by any means known per se and not shown) into the nip between the engraved roll 2 and the first set of rollers 1, where it is associated with the first fold (or group folds) 5.

Une association est ainsi réalisée au niveau des protubérances du cylindre gravé, sur une partie de la surface des plis, selon des bandes parallèles au sens de défilement des feuilles.An association is thus made at the level of the protrusions of the engraved cylinder, on a part of the surface of the folds, in strips parallel to the direction of travel of the sheets.

Cette association est complétée puisque les deux plis ainsi positionnés et associés passent ensuite dans le nip entre la deuxième série de petits cylindres lisses 3 et le cylindre gravé 2.This association is completed since the two folds thus positioned and associated then pass into the nip between the second series of small smooth cylinders 3 and the engraved cylinder 2.

Les petits cylindres lisses 3 étant transversalement décalés vis-à-vis des petits cylindres 1, comme visible sur les figures 2 et 3, on réalise ainsi une association sur toute la surface de la laize.The small smooth cylinders 3 being transversely offset vis-à-vis the small cylinders 1, as visible on the figures 2 and 3 Thus, an association is made on the entire surface of the width.

Avantageusement on prévoit une zone axiale de recouvrement (e) des surfaces couvertes par les molettes tel qu'illustré par le schéma de la figure 3. Une largeur de recouvrement (e) plus spécifiquement préconisée est d'au moins 0,1 mm et préférentiellement d'environ 1 mm. Elle peut raisonnablement être comprise entre 0,1 et 10 mm.Advantageously, an axial zone of overlap (e) surfaces covered by the wheels is provided as illustrated by the diagram of the figure 3 . A covering width (e) more specifically recommended is at least 0.1 mm and preferably about 1 mm. It can reasonably be between 0.1 and 10 mm.

Ce décalage particulier garantit l'association sur toute la largeur de la laize sans aucune zone non associée et avec une certaine tolérance pour le positionnement de chacun des petits cylindres.This particular offset ensures the association across the width of the width without any unassociated area and with a certain tolerance for the positioning of each of the small cylinders.

Avantageusement on observe selon l'invention une meilleure visibilité du motif de gaufrage au niveau des zones d'association car la pression exercée entre le cylindre gravé 2 et les petits cylindres 1, 3, au moment de l'association crée un filigranage du papierAdvantageously, according to the invention, a better visibility of the embossing pattern at the association zones is observed because the pressure exerted between the engraved cylinder 2 and the small cylinders 1, 3 at the time of the combination creates a watermarking paper.

Les contraintes inhérentes aux procédés connus (notamment en ce qui concerne le motif d'association) sont donc inexistantes selon l'invention.The constraints inherent in the known methods (especially with regard to the reason for association) are therefore non-existent according to the invention.

Le motif de gaufrage peut être uniforme sur toute la laize, à un ou plusieurs niveaux, ou bien différent selon des bandes parallèles.The embossing pattern may be uniform across the width, at one or more levels, or different in parallel stripes.

Par ailleurs, le deuxième pli (ou groupe de plis) 6 peut être gaufré ou non, crêpé ou non lorsqu'il rejoint le premier pli 5 au niveau du nip entre le cylindre gravé 2 et la première série de petits cylindre 1.Furthermore, the second fold (or group of folds) 6 can be embossed or not, creped or not when it joins the first fold 5 at the nip between the engraved cylinder 2 and the first series of small cylinder 1.

En outre, les défauts de géométrie du cylindre gravé 2 et/ou des molettes 1, 3 sont compensés par l'utilisation de molettes réglables individuellement: plus précisément la force d'appui de chaque molette 1, 3 contre le cylindre gravé 2 peut être réglée ainsi que sa position sur l'un des axes XX' ou YY'.In addition, the defects in geometry of the engraved cylinder 2 and / or the wheels 1, 3 are compensated by the use of individually adjustable wheels: more precisely the support force of each wheel 1, 3 against the engraved cylinder 2 can be set as well as its position on one of the axes XX 'or YY'.

Cette modularité dans le réglage des molettes a un impact direct sur la qualité du produit obtenu.This modularity in the adjustment of the wheels has a direct impact on the quality of the product obtained.

Chaque molette peut être déplacée le long de son axe de rotation (XX', YY') afin de régler la largeur de recouvrement (e) précitée.Each wheel can be moved along its axis of rotation (XX ', YY') to adjust the overlap width (e) above.

Le parallélisme ou réglage « pseudo-axial » de chaque molette peut en outre être réglé. Il s'agit ici de régler angulairement l'axe de rotation de chaque molette vis-à-vis de l'axe de rotation du cylindre gravé 2.Parallelism or "pseudo-axial" adjustment of each wheel can also be adjusted. Here it is a question of adjusting angularly the axis of rotation of each wheel vis-à-vis the axis of rotation of the engraved cylinder 2.

Sans sortir du cadre de l'invention et sans changer le positionnement relatif de chacun des cylindres ou série de cylindre 1, 2, 3, 4, l'orientation de cet ensemble peut être différente de celle illustrée et explicitée ci-avant.Without departing from the scope of the invention and without changing the relative positioning of each of the cylinders or cylinder series 1, 2, 3, 4, the orientation of this assembly may be different from that illustrated and explained above.

En particulier les axes AA' et CC' des cylindres 2 et 4 peuvent appartenir non pas à un plan horizontal mais à un plan vertical ou sensiblement vertical.In particular the axes AA 'and CC' of the cylinders 2 and 4 may belong not to a horizontal plane but to a vertical or substantially vertical plane.

Dans tous les cas, on cherche à répartir les forces appliquées au cylindre gravé 2, de façon optimale.In all cases, it is sought to distribute the forces applied to the engraved cylinder 2, optimally.

La disposition des principaux éléments nécessaires à l'invention permet avantageusement l'utilisation d'un même cylindre gravé 2 à la fois pour le gaufrage d'au moins un pli et pour l'association par marquage de plusieurs plis.The arrangement of the main elements required for the invention advantageously allows the use of the same engraved cylinder 2 at a time for the embossing of at least one ply and for the association by marking of several plies.

Par ailleurs, selon une variante de l'invention, les molettes peuvent être réparties sur plus de deux axes de rotation, les axes étant disposés autour du cylindre gravé 2 de façon à équilibrer les forces s'exerçant sur le cylindre 2.Furthermore, according to a variant of the invention, the knurls can be distributed over more than two axes of rotation, the axes being arranged around the engraved cylinder 2 so as to balance the forces acting on the cylinder 2.

A titre d'exemple illustratif, il a été réalisé selon l'invention des feuilles de papier toilette constituées de deux plis d'ouate de cellulose de type CWP (Conventional Wet Press) de grammage total égal à 42 g/m2. L'un des plis est gaufré avant l'association, par un microgaufrage comprenant plus de 30 protubérances/cm2 ; l'autre pli est gaufré entre les cylindres 4 et 2 avec un motif comprenant un réseau régulier de grosses et de petites protubérances : les grosses protubérances étant alignées et formant des losanges à l'intérieur desquels les petites protubérances sont disposées avec une haute densité.By way of illustrative example, it has been realized according to the invention toilet paper sheets consisting of two plies of cellulose wadding type CWP (Conventional Wet Press) total weight equal to 42 g / m 2 . One of the plies is embossed before the association, by a microgaufrage comprising more than 30 protuberances / cm 2 ; the other ply is embossed between the cylinders 4 and 2 with a pattern comprising a regular network of large and small protuberances: the large protuberances being aligned and forming rhombs within which the small protuberances are arranged with a high density.

Les deux plis sont associés grâce à deux séries de molettes 1, 3, chaque molette de chaque série ayant une largeur de 80 mm ; les molettes 1 sont décalées vis-à-vis des molettes 3 de façon à ce qu'il existe un recouvrement (e) d'environ 1 mm.The two plies are associated through two sets of knobs 1, 3, each wheel of each series having a width of 80 mm; the wheels 1 are offset with respect to the rollers 3 so that there is a covering (e) of about 1 mm.

Par ailleurs le cylindre gravé 2 a été extérieurement durci et présente une dureté extérieure de 57 HRC (dureté Rockwell connue de l'homme du métier). Les molettes lisses sont extérieurement durcies et présentent une dureté inférieure de 2 à 20 HRC par rapport à celle du cylindre gravé 2.Furthermore the engraved cylinder 2 has been externally hardened and has an external hardness of 57 HRC (Rockwell hardness known to those skilled in the art). The smooth wheels are externally hardened and have a hardness of 2 to 20 HRC lower than that of the engraved cylinder 2.

A titre illustratif les molettes lisses 1, 3 peuvent présenter une dureté extérieure de 47 HRC.As an illustration, the smooth wheels 1, 3 may have an external hardness of 47 HRC.

Les vitesses de défilement des plis, au niveau de l'association, peuvent être de l'ordre de 450 m/mn, voire davantage en fonction du type de fabrication.The speeds of scrolling folds, at the level of the association, can be of the order of 450 m / min, or even more depending on the type of manufacture.

Claims (14)

  1. Method for the combination of at least two plies (5, 6) based on tissue paper without glue and by pressure marking, characterized in that it involves embossing at least one first ply (5) according to an embossing design by passage between a first cylinder (2) and a cylinder (4) covered externally with a rubber blanket, then combining at least one second ply (6) with the said first ply (5) by causing the said plies (5, 6) to pass between a first engraved steel cylinder (2) of axis CC' and at least one first series of small externally smooth coaxial cylinders (1) of axis XX', then between the said first cylinder (2) and a second series of small externally smooth coaxial cylinders (3) of axes YY', the axes CC', XX' and YY' being horizontal and parallel.
  2. Method according to Claim 1, characterized in that combination is carried out over all or part of the said embossing design.
  3. Combination method according to Claim 1 or 2, characterized in that the small cylinders (1; 3) of each series are axially apart from one another at a distance substantially equal to their width and are arranged, staggered from one series to the other, so as to obtain an overlap width (e) in the cross direction of between approximately 0.1 mm and approximately 10 mm, preferably of approximately 1 mm.
  4. Combination method according to any one of the preceding claims, characterized in that the second ply (6) is embossed individually prior to combination.
  5. Combination method according to any one of Claims 1 to 3, characterized in that the second ply (6) is not embossed before combination.
  6. Combination method according to any one of the preceding claims, characterized in that all or some of the small cylinders (1, 3) are adjustable individually in terms of their pressure against the engraved cylinder (2) and/or in their axial and/or pseudo-axial positioning.
  7. Combination method according to any one of the preceding claims, characterized in that the plies (5, 6) to be combined are laid against the engraved cylinder (2) during and between all the steps of the combination.
  8. Combination method according to any one of the preceding claims, characterized in that the axes XX' and YY' are spaced angularly at an angle α, measured along the axis CC' of the first engraved steel cylinder (2), the angle α being between 10° and 180°.
  9. Combination method according to any one of the preceding claims, characterized in that the plies (5, 6) pass under a third series of small smooth coaxial cylinders cooperating with the said engraved cylinder (2).
  10. Combination method according to any one of the preceding claims, characterized in that the rubber-blanket cylinder (4), the first cylinder (2) and the small cylinders (1, 3) are respectively positioned and set in such a way that contact between the first engraved cylinder (2) and each of the small smooth cylinders (1; 3) is made under a specific pressure of between approximately 40 and approximately 250 N/mm2.
  11. Installation for the combination of at least two plies (5, 6) based on tissue paper without glue, comprising a first engraved cylinder (2) of axis CC', and a cylinder (4) covered externally with a rubber blanket, cooperating with the first cylinder for the purpose of embossing at least one first ply (5), characterized in that it comprises, furthermore, at least one first series of small externally smooth coaxial cylinders (1) of axis XX' and a second series of small externally smooth coaxial cylinders (3) of axes YY', the axes CC', XX' and YY' being horizontal and parallel, and in that the small cylinders cooperate with the said first engraved cylinder (2) for the purpose of combining the said plies (5, 6).
  12. Installation according to Claim 11, characterized in that the axes XX' and YY' are spaced apart angularly at an angle α measured along the axis CC' of the first cylinder (2), the angle α being between 10° and 80°.
  13. Installation according to either one of Claims 11 and 12, characterized in that the small cylinders (1; 3) of each series are axially apart from one another at a distance substantially equal to their width and are arranged, staggered from one series to the other, so as to obtain an overlap width (e) in the cross direction of between approximately 0.1 mm and approximately 10 mm, preferably of approximately 1 mm.
  14. Installation according to any one of Claims 11 to 13, characterized in that it comprises, furthermore, a third series of small coaxial cylinders cooperating with the said engraved cylinder (2) for the purpose of combining the said plies, the respective axes of rotation of the first, second and third series of small cylinders being arranged around the engraved cylinder (2) so as to balance the forces exerted on the said cylinder (2).
EP07848268A 2006-09-27 2007-09-21 Process and installation for combining plies forming an absorbent sheet Active EP2069136B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0608490A FR2906184B1 (en) 2006-09-27 2006-09-27 METHOD OF ASSOCIATING PLY FORMING AN ABSORBENT SHEET
PCT/FR2007/001539 WO2008037878A2 (en) 2006-09-27 2007-09-21 Process and installation for combining plies forming an absorbent sheet

Publications (2)

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EP2069136A2 EP2069136A2 (en) 2009-06-17
EP2069136B1 true EP2069136B1 (en) 2010-01-20

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US (2) US8114250B2 (en)
EP (1) EP2069136B1 (en)
AT (1) ATE455642T1 (en)
CA (1) CA2663073C (en)
DE (1) DE602007004512D1 (en)
DK (1) DK2069136T3 (en)
EA (1) EA015225B1 (en)
ES (1) ES2339509T3 (en)
FR (1) FR2906184B1 (en)
MX (1) MX2009002839A (en)
PT (1) PT2069136E (en)
WO (1) WO2008037878A2 (en)

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Publication number Priority date Publication date Assignee Title
EP2682258A1 (en) 2012-07-06 2014-01-08 UniMa Tec Prägesysteme GmbH Method and apparatus for embossing multilayer tissue webs
EP2692948B2 (en) * 2012-08-03 2023-04-19 Sca Tissue France Multi-ply tissue paper product and method for manufacturing the same
ITUB20169873A1 (en) * 2016-01-08 2017-07-08 Ind Cartarie Tronchetti Spa EQUIPMENT FOR THE MANUFACTURE OF PAPER-MADE PRODUCTS TO MORE SAILS
IT201800009090A1 (en) 2018-10-02 2020-04-02 Perini Fabio Spa SPRING ORGAN, SPRING GROUP FOR JOINING VEILS OF CELLULOSE MATERIAL, AND METHOD
CN111805981A (en) * 2020-07-28 2020-10-23 马鞍山市富源机械制造有限公司 Single-line and double-line embossing wheel alternating embossing mechanism and embossing process thereof

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Publication number Priority date Publication date Assignee Title
US3377224A (en) * 1966-03-11 1968-04-09 Kimberly Clark Co Method of embossing differentially creped tissue paper
US5543202A (en) * 1994-03-14 1996-08-06 Kimberly-Clark Corporation Process for producing a crimp-bonded fibrous cellulosic laminate
ES2241925T3 (en) 2002-05-14 2005-11-01 Georgia-Pacific France MARKET PROCEDURE OF A PAPER SHEET THAT HAS A FILIGRAN TYPE REASON.
ITMI20032279A1 (en) * 2003-11-24 2005-05-25 Ind Cartarie Tronchetti Spa EQUIPMENT FOR THE MANUFACTURE OF PAPER PRODUCTS AS FAR MORE THAN GODRONATURE

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FR2906184A1 (en) 2008-03-28
US20100006247A1 (en) 2010-01-14
EA200900460A1 (en) 2009-10-30
EA015225B1 (en) 2011-06-30
ES2339509T3 (en) 2010-05-20
WO2008037878A3 (en) 2008-06-05
EP2069136A2 (en) 2009-06-17
ATE455642T1 (en) 2010-02-15
CA2663073A1 (en) 2008-04-03
US20120103553A1 (en) 2012-05-03
FR2906184B1 (en) 2008-11-07
DK2069136T3 (en) 2010-05-03
US8323453B2 (en) 2012-12-04
CA2663073C (en) 2015-01-20
PT2069136E (en) 2010-04-14
US8114250B2 (en) 2012-02-14
DE602007004512D1 (en) 2010-03-11
WO2008037878A2 (en) 2008-04-03
MX2009002839A (en) 2009-03-30

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