EP1319748B9 - Multiply sheet of absorbent paper - Google Patents

Multiply sheet of absorbent paper Download PDF

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Publication number
EP1319748B9
EP1319748B9 EP20010403221 EP01403221A EP1319748B9 EP 1319748 B9 EP1319748 B9 EP 1319748B9 EP 20010403221 EP20010403221 EP 20010403221 EP 01403221 A EP01403221 A EP 01403221A EP 1319748 B9 EP1319748 B9 EP 1319748B9
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EP
European Patent Office
Prior art keywords
ply
protrusions
embossing
sheet
cylinder
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.)
Active
Application number
EP20010403221
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German (de)
French (fr)
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EP1319748B2 (en
EP1319748B1 (en
EP1319748A1 (en
Inventor
Pierre Graff
Benoît Hoeft
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Georgia-Pacific France
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Georgia-Pacific France
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Family has litigation
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Priority to EP20010403221 priority Critical patent/EP1319748B9/en
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Publication of EP1319748B2 publication Critical patent/EP1319748B2/en
Publication of EP1319748B9 publication Critical patent/EP1319748B9/en
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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30Multi-ply
    • D21H27/40Multi-ply at least one of the sheets being non-planar, e.g. crêped
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31FMECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/07Embossing, i.e. producing impressions formed by locally deep-drawing, e.g. using rolls provided with complementary profiles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31FMECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07Embossing
    • B31F2201/0707Embossing by tools working continuously
    • B31F2201/0715The tools being rollers
    • B31F2201/0723Characteristics of the rollers
    • B31F2201/0733Pattern
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31FMECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07Embossing
    • B31F2201/0707Embossing by tools working continuously
    • B31F2201/0715The tools being rollers
    • B31F2201/0723Characteristics of the rollers
    • B31F2201/0738Cross sectional profile of the embossments
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31FMECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07Embossing
    • B31F2201/0758Characteristics of the embossed product
    • B31F2201/0761Multi-layered
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31FMECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07Embossing
    • B31F2201/0758Characteristics of the embossed product
    • B31F2201/0761Multi-layered
    • B31F2201/0764Multi-layered the layers being nested
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING 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
    • B31FMECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07Embossing
    • B31F2201/0758Characteristics of the embossed product
    • B31F2201/0761Multi-layered
    • B31F2201/0766Multi-layered the layers being superposed tip to tip
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10Methods of surface bonding and/or assembly therefor
    • Y10T156/1002Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1007Running or continuous length work
    • Y10T156/1023Surface deformation only [e.g., embossing]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24612Composite web or sheet

Description

  • L'invention se rapporte au domaine des papiers absorbants à usage sanitaire ou domestique, et notamment aux papiers en ouate de cellulose crêpée. The invention relates to the field of absorbent paper for sanitary or domestic use, including the papers creped cellulose wadding.
  • Elle se rapporte en particulier au domaine des papiers destinés à l'essuyage dans un usage ménager, domestique ou industriel. It relates in particular to the field of paper for wiping in domestic use, domestic or industrial. Pour cette application, on utilise des papiers présentant une résistance à l'humidité conférée par l'addition d'une résine spécifique dans la pâte contenant les fibres papetières en suspension, avant la formation de la feuille. For this application, use of paper having a moisture resistance conferred by the addition of a specific resin into the pulp containing the papermaking fibers in suspension, prior to forming the sheet. Cette résine, une fois réticulée, forme un réseau résistant au moins temporairement au pouvoir désagrégeant de l'eau. This resin, when cured, forms a strong network at least temporarily in power disintegrating water.
  • Dans ce domaine il est connu de confectionner des feuilles de papier composées de plusieurs plis crêpés de grammage compris entre 12 et 30-35 g/m 2 munis de protubérances qui sont obtenues par gaufrage. In this field it is known to make paper sheets consisting of several plies of creped weight between 12 and 30-35 g / m 2 provided with protuberances which are obtained by embossing.
  • En effet, le gaufrage donne du bouffant à la feuille et il induit une amélioration de l'absorption des liquides, du toucher et de la douceur. In fact, embossing imparts bulk to the sheet and it induces a liquid absorption improvement of feel and softness. On a cherché à augmenter davantage la capacité d'absorption en créant des feuilles multicouches obtenues en associant au moins deux plis, constitués chacun d'au moins une desdites feuilles gaufrées. Attempts have been made to further increase the absorption capacity by creating multi-layer sheets obtained by combining at least two plies, each consisting of at least one of said embossed sheets.
  • On obtient ainsi une feuille multiple qui présente des caractéristiques mécaniques, telle que la résistance à la traction, ainsi qu'une capacité d'absorption déterminées. Thus, a multiple sheet has mechanical properties, such as tensile strength and a defined absorption capacity.
  • Deux modes de gaufrage et d'assemblage des plis sont couramment mis en oeuvre selon les caractéristiques désirées du produit final. Two methods of embossing and assembling the plies are commonly used according to the desired characteristics of the final product.
  • Le premier est connu dans le domaine sous la désignation "nested" ou à emboîtement. The first is known in the field under the name "nested" or nesting. Il consiste d'abord à gaufrer chacun des plis séparément de manière à former en surface des protubérances généralement sensiblement tronconiques ou en troncs de pyramide. It consists first of embossing each of the plies separately so as to form surface protrusions generally substantially frustoconical or truncated pyramids. Ensuite, on dépose de la colle sur le sommet des protubérances de l'un des plis après qu'il a été gaufré mais avant qu'on le détache du cylindre gaufreur. Then depositing of glue on the top of the protuberances of one of the plies after it has been embossed but before it is detached from the embossing roller. On place les plis de façon que les faces présentant les protubérances viennent en vis-à-vis, les protubérances de l'un entre les protubérances de l'autre. Placing the folds so that the faces having the protrusions come in vis-à-vis, the protuberances of one between the protuberances of the other. On les assemble enfin en les rapprochant l'un de l'autre. We finally assembles by bringing one another. Ainsi les deux plis sont liés par des pellicules de colle entre les sommets des protubérances d'un pli et des zones non gaufrées entre les protubérances de l'autre pli. Thus the two plies are joined by glue films between the tops of the protrusions of one ply and unembossed areas between the protuberances of the other ply. Les vides ménagés par cette structure sont propres à assurer à la feuille une absorption améliorée. The voids formed by this structure are conducive to improved absorption to the sheet. En outre, les faces extérieures ont un toucher lisse et moelleux en raison des alvéoles formés par le dos des protubérances. In addition, the outer faces have a smooth and soft touch because the cells formed by the backs of the protrusions. Cette technique est illustrée par le brevet This technique is illustrated by patent US 3,867,225 US 3867225 . .
  • Le second mode d'assemblage est connu dans le domaine sous la désignation « pointe à pointe ». The second assembly method is known in the field under the name "point to point". Il se distingue du précédent par la disposition relative des deux plis. It differs from the previous by the relative arrangement of the two plies. Après qu'ils ont été gaufrés séparément, on amène ceux-ci l'un sur l'autre de façon à faire coïncider les sommets des protubérances, tous ou au moins en partie. After they have been embossed separately, it leads thereof one on the other so as to align the tops of the protrusions, all or at least in part. Les plis sont liés entre eux par les sommets des protubérances, pointes contre pointes. The folds are bound together by the tops of the protuberances, spikes against spikes. Cette technique est illustrée par le brevet This technique is illustrated by patent US 3,414,459 US 3414459 . .
  • Les produit fabriqués selon ces techniques ont longtemps présenté un motif de gaufrage simple dans lequel les protubérances étaient alignées selon deux directions croisées, de manière uniforme. The product manufactured according to these techniques have long presented a simple embossing pattern wherein the protuberances were aligned according to two crossed directions, uniformly. Un tel motif permet d'obtenir des propriétés homogènes mais présente peu d'attrait visuel. Such a pattern provides homogeneous properties but has little visual appeal.
  • Cependant depuis quelques années, on a cherché à rendre l'aspect du produit moins banal en répartissant différemment les protubérances. However in recent years have sought to make the appearance of the less mundane product by distributing differently the protrusions. La demanderesse commercialise ainsi un essuie-tout dont les alvéoles en surface sont disposés selon des cercles concentriques évoquant la propagation de l'absorption d'un liquide que l'on verse sur une feuille absorbante ou bien la propagation des ondes en surface lorsqu'une goutte d'eau tombe dans un liquide. The applicant markets as a paper towel whose surface cells are arranged in concentric circles referring to the spread of the absorption of a liquid that is poured on an absorbent sheet or the propagation of surface waves where drop of water falls in a liquid. Ce motif notamment est composé de premières zones distinctes en forme de disques définis par trois ou quatre cercles concentriques. This particular pattern is composed of discrete first areas of disc-shaped defined by three or four concentric circles. Les disques sont eux-mêmes disposés régulièrement selon des directions croisées. The discs themselves are arranged regularly as cross directions. Des secondes zones, définies entre les disques adjacents, ont une forme générale de losange. Second zones defined between adjacent discs, have a general diamond shape.
  • Un motif de ce type présente un intérêt dans la mesure où il est bien visible par le consommateur. A pattern of this type is of interest insofar as it is clearly visible by the consumer.
  • La demanderesse s'est fixé comme objectif la réalisation de produits présentant des motifs dont le relief était accentué et dont la perception était améliorée. The plaintiff's goal is the realization of products with patterns whose relief was accentuated and whose perception had improved.
  • Elle est parvenue à réaliser cet objectif avec une feuille multiple selon la revendication 1. It succeeded in achieving this goal with a multiple sheet according to claim 1.
  • Grâce à la structure ainsi définie, on augmente la perception visuelle du premier motif en créant sur la face externe des secondes zones dont le niveau est différent de celui des premières zones comportant le premier motif. Thanks to the structure thus defined, increases the visual perception of the first pattern by creating on the outer face of the second regions whose level is different from the first regions having the first pattern. L'effet tridimensionnel est renforcé. The three-dimensional effect is enhanced. On observe également que l'épaisseur de la feuille reste plus homogène. It is also observed that the thickness of the sheet remains more homogeneous. Cet effet est en outre accentué par la densité plus élevée du motif des protubérances des secondes zones. This effect is further accentuated by the higher density of the pattern of protrusions of the second regions.
  • Le The brevet US 2177490 US Patent 2177490 porte sur une feuille d'emballage constituée de deux plis gaufrés dont chacun présente des protubérances sur les deux faces. relates to a packaging film consists of two embossed plies each having projections on both sides. Les protubérances sont réparties en zones distinctes avec des formes et/ou des dimensions différentes. The protuberances are divided into separate areas with different shapes and / or sizes.
  • L'invention comprend également d'autres caractéristiques prises individuellement ou en combinaison. The invention also includes other features individually or in combination.
  • Les protubérances disposées sur les premières zones ont une densité inférieure à 20 au cm 2 de préférence inférieure à 12 au cm 2 . The protuberances disposed on the first zones have a density of less than 20 cm 2 preferably less than 12 cm 2. Une telle répartition des premières protubérances correspond à des hauteurs de protubérances comprises entre 1 et 2 mm. Such a distribution of first protrusions corresponds to protrusions heights between 1 and 2 mm. Cela permet de créer entre le premier pli gaufré et le second pli des espaces assurant une bonne absorption sans perdre en résistance à l'écrasement. This creates between the first embossed ply and the second ply spaces ensuring good absorption without losing resistance to crushing. Cela vaut en particulier lorsque le second pli n'est pas gaufré dans les zones faisant face auxdites premières et secondes zones. This applies in particular when the second ply is not embossed in areas facing said first and second areas.
  • Les protubérances disposées sur les secondes zones ont par rapport aux premières protubérances une hauteur plus faible et une densité supérieure à 30 au cm 2 de préférence supérieure à 40 au cm 2 . The protuberances disposed on the second areas are compared with first protuberances a lower height and a density greater than 30 cm 2 preferably greater than 40 cm 2. Par leur densité plus élevée et leur hauteur différente, les secondes protubérances forment des plateaux qui améliorent l'effet de contraste avec les premières zones. By their higher density and different height, the second protuberances form plates that improve the effect of contrast with the first zones.
  • Les premières zones et les secondes zones sont adjacentes. The first zones and the second zones are adjacent.
  • Des troisièmes protubérances en forme de muret relient deux premières protubérances adjacentes d'un alignement. Third protrusions shaped wall connect two adjacent first protrusions alignment. Afin d'améliorer encore la visibilité du motif des premières protubérances, on crée des protubérances en forme de muret qui renforcent le tracé des alignements sans pour autant nuire à la résistance à la déchirure. To further enhance the visibility of the pattern of the first protrusions is created protrusions shaped wall that reinforce the route alignments without harming the tear resistance.
  • Le second pli est du type à séchage par soufflage traversant. The second ply is the through-blow drying type. La combinaison d'un pli gaufré d'ouate de cellulose, obtenue par pressage humide conventionnel, avec un pli du type à séchage par soufflage traversant est particulièrement avantageuse dans le cadre de l'invention. The combination of embossed ply of tissue paper, obtained by conventional wet-pressing, with a fold of blow drying through type is particularly advantageous in the context of the invention. On optimise ainsi l'absorption par rapport à la résistance mécanique. This optimizes the absorption versus strength.
  • L'invention propose aussi un cylindre sur lequel on gaufre le premier pli. The invention also provides a cylinder on which the first ply is embossed. Celui-ci comprend des premiers picots formant des alignements dans des premières zones et des seconds picots dont la hauteur est plus faible et la densité plus élevée. The latter comprises first pins forming alignments in the first areas and second spikes whose height is lower and the higher density. Les sommets des premiers et des seconds picots sont situés dans les mêmes plans tangents le long des génératrices du cylindre. The tops of the first and second pins are located in the same planes tangent along the generatrices of the cylinder.
  • L'invention propose également un procédé de fabrication d'un produit conforme à l'invention. The invention also provides a method of manufacturing a product according to the invention.
  • D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés sur lesquels : Other features and advantages of the invention will become apparent from reading the following detailed description for the understanding of which reference is made to accompanying drawings, wherein:
    • la the figure 1 figure 1 représente, vu de dessus, un exemple de réalisation d'une feuille de papier multiple gaufré conforme à l'invention, represents, seen from above, an exemplary embodiment of a multiple embossed paper sheet according to the invention,
    • la the figure 2 Figure 2 est une vue schématique, en coupe et en perspective cavalière, d'une feuille de papier multiple conforme à l'invention, is a schematic view, in section and in perspective, a multiple paper sheet according to the invention,
    • la the figure 3 Figure 3 est une vue schématique, en perspective, montrant la surface d'un cylindre de gaufrage, is a schematic perspective view showing the surface of an embossing cylinder,
    • la the figure 4 Figure 4 est une vue agrandie de la surface du cylindre de la is an enlarged view of the surface of the cylinder figure 3 Figure 3 non selon la revendication 1. not according to claim 1.
    • la the figure 5 Figure 5 est une vue, en perspective, d'un autre mode de réalisation des picots de la première zone selon l'invention, is a view, in perspective, of another embodiment of the spikes of the first area according to the invention,
    • la the figure 6 Figure 6 est une représentation photographique d'une feuille de l'invention. is a photographic representation of a foil of the invention.
  • On a représenté sur les There is shown in the figures 1 figures 1 et and 2 2 un exemple de réalisation d'une feuille multiple 10 de papier absorbant. an exemplary embodiment of a multiple sheet 10 of tissue paper. Cette feuille comprend deux plis disposés l'un sur l'autre : un premier pli dit supérieur 12 et un second pli 14 dit inférieur. This sheet comprises two plies arranged one above the other: a first fold said upper 12 and a second fold 14, said bottom. Cette feuille est destinée à l'essuyage sur un plan général, et à un usage comme essuie-tout ménager notamment. This sheet is for wiping on a general level, and to use as towel including household. Un tel produit se présente sous la forme de rouleau comprenant une cinquantaine de coupons prédécoupés. Such a product is in the form of a roll comprising fifty precut coupons. Le papier est de l'ouate de cellulose de grammage compris entre 12 et 35 g/m 2 . Paper is the weight of cellulose wadding between 12 and 35 g / m 2. Le pli supérieur 12 est, par exemple, du type obtenu selon un procédé avec pressage conventionnel humide, et connu dans le domaine sous le sigle « CWP ». The upper ply 12 is, for example, of the type obtainable by a process with conventional wet pressing, and known in the art as "CWP" symbol. Le pli 14 est lui de préférence du type obtenu selon un procédé avec séchage par air traversant et connu dans le domaine sous le sigle « TAD ». The fold 14 is it preferably obtained by a process type with through air drying and known in the art by the acronym "TAD". selon un autre mode de réalisation les deux plis sont de type « TAD » according to another embodiment the two plies are of type "TAD"
  • Selon le mode de réalisation représenté, le second pli n'est pas gaufré. According to the embodiment shown, the second ply is unembossed.
  • Un procédé de fabrication du papier, de type CWP consiste à déposer les fibres en suspension dans l'eau sur une toile pour former une feuille. A method of manufacturing the paper, type CWP consists in depositing the fibers suspended in water on a wire to form a sheet. On égoutte la feuille, puis on la transfère sur un feutre qui va permettre de l'appliquer avec une presse contre un cylindre de séchage. After draining the sheet, and then transferred on a felt which will allow to apply with a press against a drying cylinder. La feuille en est décollée et est crêpée au moyen d'une lame formant racle. The sheet is peeled off and is creped by means of a doctor blade. Elle est enfin mise en bobine en attente d'une transformation en produit fini. It is finally setting coil awaiting processing into finished articles. Une telle technique, présentée ici de façon sommaire, est dite conventionnelle. Such a technique, presented here in summary form, is called conventional. Il existe bien sûr des variantes. There are of course variations.
  • Une technique de type TAD consiste après égouttage à sécher la feuille sans exercer de pression, en partie au moins, jusqu'à une siccité suffisante pour figer les fibres au sein de la feuille. A TAD type technique involves dripping after drying the sheet without pressure, at least in part, to a sufficient dryness to freeze the fibers within the sheet. Le cas échéant, on termine le séchage par application de la feuille sur un cylindre chauffé. Where appropriate, it terminates the drying by application of the sheet onto a heated cylinder. Grâce à ce premier séchage, on peut presser la feuille sur le cylindre. With this first drying, it can press the sheet on the cylinder. Elle conserve une partie de son volume. It retains some of its volume. Ce cylindre permet en outre son crêpage. This cylinder also allows the crepe. On réalise le séchage sans pression en soufflant de l'air chaud au travers de la feuille après son égouttage. unpressurized drying is carried out by blowing hot air through the sheet after drainage. Cette technique, que l'on désigne dans le domaine sous le sigle TAD, permet d'obtenir une feuille plus épaisse, de plus grand volume massique que la technique conventionnelle. This technique, which is referred to in the field as TAD acronym provides a thicker sheet, greater specific volume than the conventional technique.
  • La feuille 10 est orientée selon deux directions, l'une longitudinale et l'autre transversale, représentées sur les The sheet 10 is oriented in two directions, the longitudinal and the other transverse, shown in figures 1 figures 1 et and 2 2 par les flèches L et T qui correspondent respectivement à la direction de défilement de la feuille lors de sa fabrication, sens marche, et la direction perpendiculaire à celle-ci, sens travers. by the arrows L and T which correspond to the running direction of the sheet during its manufacture, the machine direction, and the direction perpendicular thereto, the transverse direction.
  • Le premier motif de gaufrage 16 sur le pli supérieur apparaît globalement à la The first embossing pattern 16 of the upper ply generally appears at the figure 1 figure 1 et plus en détail sur la and more detail on the figure 2 Figure 2 . . Il est composé de premières protubérances 18 de forme générale tronconique faisant saillie à l'intérieur de la feuille. It is composed of first protrusions 18 of generally frustoconical shape protruding inside of the sheet. A chaque protubérance correspond un alvéole sur l'autre face du pli 12, tournée vers l'extérieur. Each protrusion has a corresponding recess on the other side of the fold 12, facing outwards. Les protubérances sont disposées selon des alignements, ici des cercles concentriques, à l'intérieur de premières zones. The protuberances are arranged in rows, here concentric circles, within first zones. Les protubérances 18 ont une première hauteur H1 qui est comprise entre 0,5 mm et 1,5 mm. The protrusions 18 have a first height H1 that is between 0.5 mm and 1.5 mm. Leur nombre à l'intérieur des premières zones est compris entre 6 par cm 2 et 20 par cm 2 , de préférence entre 9 et 12 par cm 2 . Their number within the first zones is between 6 per cm 2 to 20 per cm 2, preferably between 9 and 12 cm 2. Les sommets 19 des protubérances sont au contact du pli inférieur 14. The vertices 19 of the protrusions are in contact with the bottom fold 14.
  • Ces premières zones 16 sont donc ici en forme de disques. These first zones 16 are here so shaped discs. Ces derniers sont eux-mêmes ordonnés selon deux directions croisées d'un réseau à maille carrée, ici à 45° par rapport au sens marche L. A l'intérieur de chaque maille, formée par les disques des premières zones, on trouve des secondes protubérances 38 formant des secondes zones 36. Ces protubérances 38 ont une hauteur H2 plus faible que celle des premières protubérances 18. Elle est comprise entre 0,2 mm et 1,5 mm comme on le voit bien sur la The latter are themselves arranged according to two crossed directions of a square mesh network, here 45 ° to the machine direction L. Inside each cell, formed by the discs of the first areas, there are seconds protrusions 38 forming the second regions 36. These protuberances 38 have a lower height H2 than that of the first protrusions 18. it is between 0.2 mm and 1.5 mm as is well seen in figure 2 Figure 2 . . Les secondes protubérances forment un plateau d'épaisseur plus faible. The second protrusions form a thinner tray. Depuis la face externe, on voit un alvéole au droit de chaque protubérance 38. La répartition des protubérances 38 dans les secondes zones 36 est plus serrée que celles des premières zones 16. La densité du motif est comprise entre 30 par cm 2 et 80 par cm 2 , de préférence entre 40 et 60 par cm 2 . From the outer face, there is shown a cell to the right of each protrusion 38. The distribution of the protrusions 38 in the second regions 36 is closer than the first zones 16. The pattern density is between 30 and 80 per cm 2 by cm 2, preferably between 40 and 60 per cm 2. L'aspect en forme de plateau vient de la disposition relativement serrée des secondes protubérances qui sont réparties sensiblement uniformément dans cette zone. The plate-shaped part comes from the relatively dense packing of the second protrusions are substantially uniformly distributed in this zone. En bordure de cette zone qui est adjacente aux premières zones, on observe un rehaussement très net. The edge of this zone which is adjacent to the first regions, a clear enhancement is observed. Le sommet des secondes protubérances est en contact avec le pli 14. Au moins pour certains, et en particulier pour l'ensemble, une pellicule de colle forme une liaison entre le sommet 39 des protubérances et le pli 14. Il en est de même des sommets des protubérances 18 des premières zones. The top of the second protrusions is in contact with the crease 14. At least for some, and in particular for all, an adhesive film forms a bond between the top 39 of the protrusions and the bend 14. It is of even tops of the protuberances 18 of the first zones. On comprend que les sommets 19 et 39 sont dans le même plan que le pli 14. It is understood that the peaks 19 and 39 are in the same plane as the fold 14.
  • Le second pli 20 n'est pas gaufré. The second ply 20 is not embossed. L'écart de hauteur entre H1 et H2 est compris entre 0,3 mm et 1,3 mm. The height difference between H1 and H2 is between 0.3 mm and 1.3 mm.
  • Pour gaufrer le pli supérieur, on utilise un cylindre gravé comme on peut le voir sur les To emboss the upper ply, using an engraved cylinder as can be seen in figures 3 et 4 Figures 3 and 4 . . La The figure 3 Figure 3 montre l'aspect général de la surface du cylindre avec les lignes de picots 28 et 48 disposés selon le motif de la shows the general appearance of the surface of the cylinder with the pins of lines 28 and 48 arranged according to the pattern of the figure 1 figure 1 . . Le détail de la Details of the figure 4 Figure 4 , correspondant à la référence D4 sur la , Corresponding to the reference on the D4 figure 3 Figure 3 , montre des premiers picots de forme tronconique 28 avec un sommet 29 formant un méplat. Shows the first frustum-shaped pins 28 with a top 29 forming a flat. Les protubérances ont une pente assez raide, entre 70° et 75°. The protrusions have a steep slope between 70 ° and 75 °. La hauteur H'1 des picots entre les méplats 29 et le fond de la gravure 28 est au moins égale à H1 : H'1>=H1. H'1 the height of the pins between the flats 29 and the bottom of the engraving 28 is at least equal to H1: H'1> = H1. Les protubérances 48 ont aussi une forme tronconique, avec un sommet formant un méplat 49. Les méplats 49 sont à la même altitude par rapport à l'axe de rotation du cylindre que les sommets 29. En revanche, la profondeur de la gravure H'2 est moindre H'2<H'1. The protrusions 48 also have a frustoconical shape, with an apex forming a flat surface 49. The flat surfaces 49 are at the same elevation relative to the axis of rotation of the cylinder the peaks 29. In contrast, the depth of the engraving H ' 2 is less H'2 <H'1. Les protubérances 48 sont réparties de façon homogène dans les secondes zones. The protrusions 48 are homogeneously distributed in the second zones.
  • Dans l'exemple représenté, les picots ont une forme tronconique à base circulaire. In the example shown, the pins have a frustoconical shape with a circular base. D'autres formes sont possibles, losange notamment ou bien tronc de pyramide à base polygonale ou encore à base linéaire. Other shapes are possible, including diamond or trunk polygonal-based pyramid or linear basis.
  • Le procédé de fabrication d'une feuille 10 telle que revendiquée consiste à gaufrer un pli d'ouate de cellulose crêpée sur le cylindre en pressant le pli sur le cylindre au moyen d'un cylindre en caoutchouc ou en une autre matière résiliente. The method of manufacturing a sheet 10 as claimed consists of embossing a tissue paper ply creped on the cylinder by pressing the ply on the cylinder by means of a cylinder made of rubber or another resilient material. La pression de gaufrage doit être suffisante pour que l'ouate de cellulose pénètre dans l'espace entre les picots des premières zones. the embossing pressure should be sufficient so that the cellulose wadding enters the space between the pins of the first zones. En particulier, dans les premières zones, le papier doit descendre à une profondeur supérieure à H'2. In particular, in the first areas, the paper must descend to a depth greater than H'2. La forme en plateau, avec un motif serré, des secondes zones en revanche limite la pénétration du papier entre les picots des secondes zones. plateau in shape, with an interference pattern, the second regions on the other hand limits the penetration of the paper between the pins of the second regions. Le caoutchouc est plutôt refoulé vers la périphérie des secondes zones. Rubber is rather pushed to the periphery of the second regions. Il en résulte un effet de marquage accru dans cette partie frontière entre les premières zones et les secondes zones. This results in increased marking effect in the boundary portion between the first zones and the second zones.
  • Pour fabriquer une feuille à deux plis selon l'enseignement de l'invention, on dépose de la colle sur les méplats 29 et 49. Comme ils se trouvent à la même hauteur, on peut déposer simplement celle-ci au moyen d'un cylindre applicateur de colle. To make a sheet with two folds according to the teaching of the invention, depositing glue on the flat portions 29 and 49. As they are at the same height, one can simply drop it through a cylinder glue applicator. Ensuite, on approche un pli non gaufré et le presse sur les sommets pour former des liaisons entre les deux plis le long de ces sommets. Then, approach a non-embossed ply and the press on the tops to form bonds between the two plies along these peaks. Une fois assemblée, on découpe la feuille, et on l'enroule pour en faire un produit fini comme cela est courant. Once assembled, it cut the sheet, and wound into a finished product as is common.
  • Suivant ce procédé, on augmente la liaison des plis entre eux par rapport à un procédé de gaufrage à deux niveaux de l'art antérieur car tous les sommets des picots sont liés. According to this method, increasing the binding folds each other with respect to an embossing process with two levels of the prior art because all of the vertices of the spikes are connected.
  • Dans la description qui précède, la feuille est double. In the above description, the sheet is twofold. Il entre dans le cadre de l'invention de prévoir plus de deux plis. It is within the scope of the invention to provide more than two folds. Par exemple, le pli gaufré peut être lui-même double ; For example, the embossed ply itself can be double; le pli non gaufré également. the unembossed ply also. Bien entendu, le motif représenté n'est donné qu'à titre d'exemple. Of course, the pattern shown is given as an example. D'autres motifs sont envisageables dans la mesure où ils reprennent l'enseignement de l'invention. Other patterns are possible to the extent that they show the teaching of the invention. En particulier, un mode particulier de réalisation comprend un motif constitué au moins en partie de deuxièmes protubérances à profil linéaire, dessinant par exemple une fleur. In particular, a particular embodiment comprises a pattern consisting at least partly of second protrusions straight profile, for example drawing a flower.
  • La The figure 5 Figure 5 représente un autre mode de réalisation des premières zones qui permet d'améliorer encore le caractère visible du décor gaufré. shows another embodiment of the first zones which can further improve the visible character of the embossed design.
  • On a représenté une partie des picots de la première zone, en fait des picots sur un des alignements de cette zone. Shows a part of the pins of the first region, in fact the pins on one of the alignments of the area. Selon ce mode de réalisation on a disposé des reliefs en forme de murets 30 entre les picots adjacents 28 d'un alignement. According to this embodiment was arranged reliefs shaped walls 30 between adjacent pins 28 for alignment. Les picots 28 sont tronconiques ou en tronc de pyramide avec un méplat au sommet 29. Le sommet 31 des murets 30 est à un niveau inférieur par rapport aux sommets 29. L'écart choisi est compris entre 0,4 mm et 0,9 mm. The barbs 28 are frusto-conical or truncated pyramid with a flat at the top 29. The top 31 of the walls 30 is at a lower level than the peaks 29. The selected gap is between 0.4 mm and 0.9 mm . Autrement dit, c'est aussi la différence entre leur hauteur H'1 et H'3. That is also the difference between their height and H'1 H'3.
  • L'épaisseur « e » des murets 30 est inférieure à celle des picots 28. C'est à dire à même hauteur, elle est inférieure au diamètre des picots. The thickness "e" of the walls 30 is less than the pins 28. That is the same height, it is smaller than the diameter of the pins. L'épaisseur des murets est ainsi inférieure de 10 à 50% par rapport à celle des picots, de façon à notamment limiter la pression de gaufrage supplémentaire résultant de la présence des murets. The thickness of the walls is thus less than 10 to 50% relative to that of the pins, so as to notably limit the additional embossing pressure resulting from the presence of the walls. Leur pente est de préférence la même que celle des picots. Their slope is preferably the same as that of the pins.
  • L'écart entre les hauteurs H'1 et H'3 est suffisant pour que le caoutchouc vienne au contact de la surface supérieure 31 du muret au moment du gaufrage et ainsi conformer la feuille au muret au moins partiellement. The difference between the heights H'1 and H'3 is sufficient for the rubber comes into contact with the upper surface 31 of the wall at the time of embossing and thus conform the sheet to the wall at least partially.

Claims (9)

  1. A multi-ply sheet for wiping comprising a first ply (12) and a second ply (14) incorporating a wet strength resin, each ply being made of tissue paper and exhibiting a specific surface weight between 12 and 35 g/m2, the first ply comprising a first embossing pattern in first zones (16) including first protrusions (18) projecting from an inner surface of the first ply and having corresponding alveoles on an opposite side, said first protrusions having tops (19) of which at least more than one is connected to an opposite inner surface of the second ply (14), and wherein said first ply (12) further comprises a second embossing pattern (36) including second protrusions projecting (38) from the inner surface of the first ply (12), said second protrusions having a height (H2) which is less than a height (H1) of said first protrusions characterized by the fact that the density of said first protrusions is less than 20/cm2, said second protrusions (38) are configured in second zones (36) and have a density greater than 30 protusions/cm2, and at least more than one top (39) of said second protrusions situated in a plane also containing tops (19) of the first protrusions (18) and is connected to an inside surface of the second ply (14), third protrusions (30) wall shaped connect two first protuberances adjacent in line.
  2. Multi-ply sheet as claimed in claim 1, wherein the first protrusions have a density of less than 12/cm2.
  3. Multi-ply sheet according to any of the preceding claims, wherein the second protrusions have a density more than 40/cm2.
  4. Sheet as claimed in claim 2 or 3, wherein the first zones and the second zones are adjacent.
  5. Sheet according to any of the preceding claims, wherein the second ply (14) is made by a through-air-drying method.
  6. Sheet according to any of the preceding claims, wherein the second ply (14) is unembossed.
  7. An embossing cylinder engraved with a pattern corresponding to a pattern of the sheet according to any of the preceding claims, wherein the cylinder comprises first embossing tips (26) constituting arrays in first zones and second embossing tips (46) of a shallower height than said first embossing tips and exhibiting a greater density per unit area, tops of the first embossing tips and of the second embossing tips being situated in a same plane extending tangentially along generatrices of the cylinder.
  8. A method for manufacturing a sheet using an assembly including the embossing cylinder of the preceding claim, wherein said method comprises embossing a first creped tissue paper ply (12) on said cylinder, applying an adhesive film onto the tops of the first protrusions and the second protrusions using an adhesive depositing cylinder, and linking said first ply to said second ply.
  9. Manufacturing method as claimed in the preceding claim, wherein said second ply (14) is unembossed.
EP20010403221 2001-12-12 2001-12-12 Multiply sheet of absorbent paper Active EP1319748B9 (en)

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PT01403221T PT1319748E (en) 2001-12-12 2001-12-12 Multiply sheet of absorbent paper
ES01403221T ES2305043T5 (en) 2001-12-12 2001-12-12 Multiple sheet of absorbent paper.
DK01403221T DK1319748T4 (en) 2001-12-12 2001-12-12 Multi-layer sheet of absorbent paper
AT01403221T AT393856T (en) 2001-12-12 2001-12-12 Multi-layer web of an absorbent papiers
EP20010403221 EP1319748B9 (en) 2001-12-12 2001-12-12 Multiply sheet of absorbent paper
DE60133828T DE60133828T3 (en) 2001-12-12 2001-12-12 Multi-ply web of an absorbent paper
CA 2468208 CA2468208C (en) 2001-12-12 2002-12-06 Multi-layer sheet of absorbent paper
PCT/FR2002/004215 WO2003050353A2 (en) 2001-12-12 2002-12-06 Multi-layer sheet of absorbent paper
US10/498,218 US7413630B2 (en) 2001-12-12 2002-12-06 Multi-layer sheet of absorbent paper
MXPA04005261A MXPA04005261A (en) 2001-12-12 2002-12-06 Multi-layer sheet of absorbent paper.
NO20033551A NO334198B1 (en) 2001-12-12 2003-08-11 Multilayer sheet of absorbent paper

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EP1319748B1 EP1319748B1 (en) 2008-04-30
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AT (1) AT393856T (en)
CA (1) CA2468208C (en)
DE (1) DE60133828T3 (en)
DK (1) DK1319748T4 (en)
ES (1) ES2305043T5 (en)
MX (1) MXPA04005261A (en)
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NO334198B1 (en) 2014-01-13
ES2305043T5 (en) 2011-04-15
DE60133828T2 (en) 2009-05-20
DE60133828D1 (en) 2008-06-12
CA2468208C (en) 2010-08-24
NO20033551L (en) 2003-10-13
DK1319748T3 (en) 2008-09-01
WO2003050353A2 (en) 2003-06-19
EP1319748B2 (en) 2010-12-01
NO20033551D0 (en) 2003-08-11
MXPA04005261A (en) 2005-03-23
US20050034828A1 (en) 2005-02-17
CA2468208A1 (en) 2003-06-19
EP1319748B1 (en) 2008-04-30
EP1319748A1 (en) 2003-06-18
US7413630B2 (en) 2008-08-19
WO2003050353A3 (en) 2008-01-03
AT393856T (en) 2008-05-15
DE60133828T3 (en) 2011-06-22
DK1319748T4 (en) 2011-03-07
PT1319748E (en) 2008-07-29

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