EP1239079B1 - Paper sheet with small cushions - Google Patents

Paper sheet with small cushions Download PDF

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Publication number
EP1239079B1
EP1239079B1 EP01400629A EP01400629A EP1239079B1 EP 1239079 B1 EP1239079 B1 EP 1239079B1 EP 01400629 A EP01400629 A EP 01400629A EP 01400629 A EP01400629 A EP 01400629A EP 1239079 B1 EP1239079 B1 EP 1239079B1
Authority
EP
European Patent Office
Prior art keywords
protuberances
plies
paper sheet
cells
sheet according
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.)
Expired - Lifetime
Application number
EP01400629A
Other languages
German (de)
French (fr)
Other versions
EP1239079A1 (en
Inventor
Michel Résidence Les Plaiades Basler
Sébastien Jeannot
Pierre Laurent
Rémy Ruppel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Essity Operations France SAS
Original Assignee
Georgia Pacific France SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8182650&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1239079(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Georgia Pacific France SAS filed Critical Georgia Pacific France SAS
Priority to DK01400629T priority Critical patent/DK1239079T3/en
Priority to AT01400629T priority patent/ATE364751T1/en
Priority to DE60128890T priority patent/DE60128890T2/en
Priority to ES01400629T priority patent/ES2287087T3/en
Priority to PT01400629T priority patent/PT1239079E/en
Priority to EP01400629A priority patent/EP1239079B1/en
Priority to PCT/FR2002/000770 priority patent/WO2002072956A1/en
Priority to US10/275,487 priority patent/US7846531B2/en
Priority to CA002406480A priority patent/CA2406480C/en
Priority to RU2002129596/12A priority patent/RU2295600C2/en
Publication of EP1239079A1 publication Critical patent/EP1239079A1/en
Priority to NO20025389A priority patent/NO333379B1/en
Publication of EP1239079B1 publication Critical patent/EP1239079B1/en
Application granted granted Critical
Priority to CY20071101162T priority patent/CY1106854T1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
    • 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
    • B31F2201/0733—Pattern
    • 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
    • B31F2201/0738—Cross sectional profile of the embossments
    • 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
    • B31F2201/0756—Characteristics of the incoming material, e.g. creped, embossed, corrugated
    • 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
    • B31F2201/0758—Characteristics of the embossed product
    • B31F2201/0761—Multi-layered
    • 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
    • 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
    • B31F2201/0787—Applying adhesive
    • 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
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • Y10T428/24446—Wrinkled, creased, crinkled or creped
    • Y10T428/24455—Paper
    • Y10T428/24463—Plural paper components
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24612—Composite web or sheet

Definitions

  • the invention relates to a paper sheet consisting of at least two plies of cellulose wadding forming pads.
  • the field of the invention is that of papers for sanitary or domestic use. It includes absorbent paper products whose shape, composition and structure are determined by their application. Thus, non-limiting examples include toilet paper, facial tissue, facial tissue, napkins, tablecloths, household paper towels, industrial wiping cloths, and the like.
  • the toilet paper for example, is in the form of pre-cut coupons in a continuous strip wound around a mandrel. Coupons can also be in individual form and entangled.
  • the sheet may be simple, but most often it is composed of two or more layers, also called folds, of cellulose wadding. In one sheet the folds can be simply juxtaposed, free from each other but, most often, they are embossed and bonded together by gluing or mechanically by knurling.
  • Cellulose wadding is a light weight paper: 10 to 40 g / m 2 , consisting essentially or exclusively of paper fibers and optionally comprising one or more additives to reinforce one or other of its characteristics.
  • a light weight paper 10 to 40 g / m 2
  • the incorporation of resins serves to improve the tear strength when the sheet is wet.
  • the cellulose wadding may be creped, that is to say comprise corrugations that give it a certain capacity of elongation in the running direction.
  • the creping can be obtained, for example, at the time of drying the sheet. This is applied still wet on a cylinder heated to a temperature sufficient to extract the moisture.
  • the sheet is peeled off by means of a doctor blade placed between it and the surface of the cylinder. This operation, properly conducted, causes the formation of corrugations arranged perpendicularly to the direction of travel of the sheet, said running direction.
  • the crepe of the sheet is characterized by the number of crests counted in the walking direction reduced to one unit of length.
  • the patent is known US 3,673,060 ; it describes a product, a napkin for example, formed of two folds of creped cellulose wadding bonded together by adhesive.
  • the latter is distributed in a pattern consisting of point surfaces close to each other and leaving substantial portions of the two unbound plies. From 4 to Only 8% of the surface is bound and the two plies, whose crepe lines are parallel, are not stretched in the same way. This voltage difference is obtained by stretching the two plies differently before they are bonded to each other along the said pattern.
  • Such tension control allows, after the adhesive has been fixed, that one of the folds contracts more than the other. This results in a tendency to separate the folds in the unbonded portions between the adhesive areas.
  • the patent teaches applying the adhesive to a fold by means of a suitably etched applicator roll.
  • the second ply is then deposited on the first and the two plies are drawn between two calendering rolls, one of which is etched and in phase with the applicator roll.
  • the sheet is driven between two engraved steel cylinders, to be embossed along the edges of what will be the towel after cutting. This process thus appears to be limited to the manufacture of a wafer-type product with an embossed periphery.
  • the recommended area of the unbonded portion between two adjacent bonded areas is of the order of 0.65 cm 2 . It is relatively weak. According to the example given, the area of the connecting point areas is of the order of 2 mm 2 with a spacing of 4.75 mm. It is mentioned in the patent that the sheet thus mimics the appearance and texture of a textile product. Preferably, the spikes are evenly distributed on the sheet.
  • the patent French FR 2 105 116 discloses a method of manufacturing a multi-ply sheet of flexible material, paper or plastic, wherein is printed an adhesive material on one of the folds along a pattern, said open device, representing diamonds or squares.
  • the two plies were previously embossed in a uniform pattern of protuberances and one of the two is tensioned longitudinally so as to give the sheet, after cutting into towels, a "padded" appearance. It is observed that the diamonds are very wide otherwise the glue deposited along continuous lines would create a relatively rigid product.
  • This patent thus applies to products of the napkins type or tablecloths.
  • the patent US 3,650,882 discloses a paper, consisting of three plies of cellulose wadding, wherein the central ply is extensible and elastic and the outer plies are embossed and less extensible.
  • the folds are bound along spaced areas so as to leave unrelated portions together.
  • the inner ply can thus relax and occupy the space of the unbound parts. It is expected to bind the central fold to the outer folds while it is extended relative to them.
  • the central fold retracts and the other folds become visible in the unbound parts.
  • Linked and unrelated areas appear to be of equal extent.
  • the patent US 4,469,735 also discloses a multi-ply product of cellulose wadding of different elongation characteristics to allow the formation of pockets and an increase in their wet absorption volume.
  • the object of the present invention is to provide a product consisting of at least two folds of creped cellulose wadding, having an attractive appearance for the consumer, in particular an appearance similar to that of a textile product and which is improved compared to the state of the art.
  • the subject of the invention is thus a product composed of at least two plies, an upper ply and a lower ply, of creped cellulose wadding, each weighting between 10 and 40 g / m 2 , the upper ply of which comprises first protuberances on the face turned to the lower fold, from the top of which they are linked. Said first protuberances are distributed in alignments which delimit between them surface cells of between 1 and 20 cm 2 , the upper fold being longer in the direction than the lower fold of 0.6 to 2% and being connected to the lower fold by the tops of said first protuberances, so that pads are formed inside the cells.
  • pad By pad, according to the patent, it includes a zone whose two folds are not interconnected, and which is delimited by alignments of first protuberances forming a closed contour.
  • the pad is characterized by the fact that the upper fold seems detached from the lower fold and creates a convex effect.
  • the effect of relief pads is particularly visible when unrolling the latter.
  • said alignments consist of first protuberances spaced from each other by a distance of less than 3 mm. Indeed beyond this spacing the pads are not formed properly.
  • the undulations tend to extend in the cross direction.
  • the first protuberances constituting the contours of the pads are preferably of frustoconical shape with a circular or oval base.
  • this base can also be of polygonal shape. It can also have a very elongated shape giving imprints in continuous or discontinuous lines.
  • the protuberances have a frustoconical shape, in particular of circular section, and their spacing along the alignments is very small. It is preferably smaller than the diameter of the section of the protuberance.
  • the alignments can be rectilinear or corrugated. According to a particular embodiment, they form a network, whose said cells are defined by their intersections. In particular they have a substantially diamond-shaped shape and the sides of the latter are corrugated. Such an example of a pattern is described in the patent US 5,436,057 .
  • the upper fold is embossed in a pattern consisting of the second protuberances.
  • These are frustoconical or have a vertex of linear form.
  • the top of the second protuberances is free, ie it is not glued or otherwise bound to the second fold.
  • the second fold is embossed or not.
  • the present invention also relates to a process for producing a product with at least two folds of creped cellulose wadding, weight of between 10 and 40 g / m 2 .
  • the length of the folds is different from more than 0.6%, preferably from 0.6 to 2 %.
  • the resulting band is then wrapped around a mandrel and said roll is cut into smaller rolls.
  • the two bands differ from each other by one or the other of the following characteristics taken alone or in combination: the unwinding speed, the tension in the running direction, the level or the depth of the embossing, and elasticity.
  • the sheet shown in Figures 1 and 2, is composed of two folds of creped cellulose wadding.
  • the cellulose wadding may be of the type obtained according to a method by conventional wet pressing of the sheet, and designated in the field by CWP or according to a method comprising a step of TAD type through air blowing drying.
  • the grammage for each of the plies is between 10 and 40 g / m 2 .
  • a weight of between 15 and 24 g / m 2 is preferably chosen.
  • the cellulose wadding is creped with the corrugations, as is known, oriented all, perpendicular to the direction of travel of the machine.
  • the number of crepe lines is between 40 and 80 lines per cm.
  • the plies exhibit a degree of elongation at break of at least 25%. Preferably it is not less than 20%.
  • the upper fold comprises protuberances (12) on the face of the fold which is turned towards the lower fold.
  • These protuberances being formed by embossing, a cavity corresponds to them on the side facing the outside of the sheet. They have a section in the plane of the leaf that can be circular, oval or polygonal.
  • a film of adhesive applied between the top of these first protuberances and the lower fold makes the two plies integral with one another.
  • the protuberances form alignments (14).
  • An alignment can be defined as a succession of protuberances having consecutively the smallest spacings.
  • the alignments are arranged in two directions substantially at 90 ° to each other so that they intersect forming a network and regular cells (16).
  • the cells (16) have a preferably parallelogram shape of a diamond.
  • the ratio of the length, its largest dimension, to the width, the largest dimension measured transversely to the first, is not greater than 5, preferably not more than 1.5.
  • the sides of the parallelogram are rectilinear or of corrugated shape as shown in FIG.
  • the upper fold remains detached from the lower fold at the level of the cells. This means that its dimension in the running direction is greater than that of the lower fold.
  • the analysis shows that the length of the upper fold must at least be greater than that of the lower fold by at least 0.6% for the formation of bearings on the upper fold.
  • Another necessary condition is the distance separating two adjacent protuberances along an alignment. Indeed if the spacing exceeds a certain threshold, the pads are not formed. Certain undulations exist because of the difference in length between the two folds, but they are irregular. It has been found that the pads are formed only if this distance between the protuberances remains less than 3 mm.
  • These protuberances (18) have a lower embossing height than that of the first protuberances (12). They do not form binding zones of the upper fold with the lower fold.
  • a method of manufacturing a sheet according to the invention and corresponding to an embodiment as shown in Figure 3 is described below.
  • a first continuous web of cellulose wadding (10) is unrolled from a reel (100) which is mounted on a rotatable support.
  • This strip is driven at a certain speed through an embossing group comprising a cylinder (102) with a rigid and etched surface and a cylinder (104) with a surface of resilient material such as rubber.
  • the pattern of the engraving of the rigid cylinder is for example that of FIG. 1, with first elements in relief or pins at a first etching level for producing the first protuberances and second elements in relief at a level lower than the first for the realization of the second protuberances.
  • Engravings of two-level embossing rolls are known to those skilled in the art.
  • the strip after embossing receives a film of adhesive which is deposited on the raised surfaces, that is to say those of the embossing pattern, by a cylinder (106) applicator known per se.
  • the etching pattern of the rigid cylinder corresponds to the first protuberances. It may also consist of protuberances of different depths. In this case, the adhesive film is deposited only on the protuberances with the highest relief.
  • the adhesive is a water-based adhesive, for example a polyvinyl glue common in the field of the invention.
  • the binding of the folds is obtained mechanically or in any other manner known to those skilled in the art.
  • the second fold (20) comes from a mother coil (200) which is unwound at a determined speed.
  • the pressure exerted by the marrying cylinder ensures the binding of the folds to one another.
  • the double sheet is then driven while being kept under tension to the "log" production station.
  • a "log” is an intermediate roll to the diameter of the product after it has been finished and of width equal to the width of the mother reel. Once formed, the log is driven to a sawing station where it is cut. Finally, the rolls obtained are guided to the packaging, packaging and storage stations.
  • the tension of one of the two cellulose wadding strips is adjusted with respect to the other upstream of the station where the plies are bonded to one another. This is to allow the lower fold to retract more than the other when the tensions are released.
  • a draw group located upstream of the station where the two folds are linked to each other.
  • the products were manufactured according to the method described above.
  • the upper fold was embossed in the pattern shown in Figure 1, the lower fold was not embossed.
  • a first product was manufactured by applying a difference in tension between the plies, so that the final product has a pronounced pad effect.
  • a second product was manufactured by reducing the tension gap between the two folds so that the final product had no cushioning effect.
  • a third product was produced by embossing two plies together according to the pattern of FIG. 1.
  • the cellulose wadding had the following characteristics: grammage 40.3 g / m 2 ; MD strength, 215 N / m; CD resistance, 75 N / m; with an elongation rate at break of 16%.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Laminated Bodies (AREA)
  • Bedding Items (AREA)

Abstract

The paper consists of at least two layers of crepe cellulose wadding weighing 10 - 40 g/sq m, the upper layer being between 0.6 and 2 per cent longer than the lower one and embossed to form protuberances (12) in rows (14) that are joined to the lower layer to make cushions (16) of 1 - 20 sq cm in area. The cushions have a length to width ratio of preferably 1 - 1.5 : 1, and the protuberances are truncated conical in shape with bases of 1 - 1.5 mm diameter and preferably not more than 1.5 mm apart. The two-layer paper is made from two separate rolls of paper, with the upper layer taken round an embossing roller and past an adhesive application roller before the two layers are joined together and made into rolls of smaller diameter.

Description

L'invention porte sur une feuille de papier constituée de deux plis au moins d'ouate de cellulose formant des coussinets.The invention relates to a paper sheet consisting of at least two plies of cellulose wadding forming pads.

Le domaine de l'invention est celui des papiers à usage sanitaire ou domestique. Il comprend notamment les produits en papier absorbant dont la forme, la composition et la structure sont déterminées en fonction de leur application. Ainsi on peut citer à titre d'exemples non limitatifs, les papiers hygiéniques, les mouchoirs, les mouchoirs à démaquiller, les serviettes de table, nappes, les essuie-tout ménagers, les ouates d'essuyage industriel, etc.The field of the invention is that of papers for sanitary or domestic use. It includes absorbent paper products whose shape, composition and structure are determined by their application. Thus, non-limiting examples include toilet paper, facial tissue, facial tissue, napkins, tablecloths, household paper towels, industrial wiping cloths, and the like.

Le papier toilette par exemple se présente sous la forme de coupons prédécoupés dans une bande continue enroulée autour d'un mandrin. Les coupons peuvent aussi se présenter sous une forme individuelle et être enchevêtrés. La feuille peut être simple, mais le plus souvent elle est composée de deux ou plusieurs épaisseurs, appelées aussi plis, d'ouate de cellulose. Dans une feuille les plis peuvent être simplement juxtaposés, libres les uns par rapport aux autres mais, le plus souvent, ils sont gaufrés et liés entre eux par collage ou bien mécaniquement par moletage.The toilet paper, for example, is in the form of pre-cut coupons in a continuous strip wound around a mandrel. Coupons can also be in individual form and entangled. The sheet may be simple, but most often it is composed of two or more layers, also called folds, of cellulose wadding. In one sheet the folds can be simply juxtaposed, free from each other but, most often, they are embossed and bonded together by gluing or mechanically by knurling.

L'ouate de cellulose est un papier de faible grammage : 10 à 40 g/m2, constitué essentiellement ou exclusivement de fibres papetières et comportant le cas échéant un ou plusieurs additifs pour renforcer l'une ou l'autre de ses caractéristiques. Selon les applications, on peut mettre l'accent sur l'une ou l'autre de ses propriétés et faire en sorte qu'elle présente plus de douceur, d'absorption, de résistance ou bien un aspect textile plus marqué pour la rendre plus attrayante. Par exemple, l'incorporation de résines sert à améliorer la résistance à la déchirure quand la feuille est humide.Cellulose wadding is a light weight paper: 10 to 40 g / m 2 , consisting essentially or exclusively of paper fibers and optionally comprising one or more additives to reinforce one or other of its characteristics. Depending on the application, we can focus on one or the other of its properties and make it more soft, absorbent, resistant or a more pronounced textile aspect to make it more attractive. For example, the incorporation of resins serves to improve the tear strength when the sheet is wet.

Par ailleurs l'ouate de cellulose peut être crêpée, c'est à dire comporter des ondulations qui lui confèrent une certaine capacité d'allongement dans le sens marche. Le crêpage peut être obtenu, par exemple, au moment du séchage de la feuille. Celle ci est appliquée encore humide sur un cylindre chauffé à une température suffisante pour en extraire l'humidité. On décolle la feuille au moyen d'une lame formant racle placée entre celle-ci et la surface du cylindre. Cette opération, convenablement menée, entraîne la formation d'ondulations disposées perpendiculairement au sens de défilement de la feuille, dit sens marche. On caractérise le crêpage de la feuille par le nombre de crêtes comptées dans le sens marche ramené à une unité de longueur.In addition, the cellulose wadding may be creped, that is to say comprise corrugations that give it a certain capacity of elongation in the running direction. The creping can be obtained, for example, at the time of drying the sheet. This is applied still wet on a cylinder heated to a temperature sufficient to extract the moisture. The sheet is peeled off by means of a doctor blade placed between it and the surface of the cylinder. This operation, properly conducted, causes the formation of corrugations arranged perpendicularly to the direction of travel of the sheet, said running direction. The crepe of the sheet is characterized by the number of crests counted in the walking direction reduced to one unit of length.

On connaît le brevet US 3 673 060 ; il décrit un produit, une serviette de table par exemple, formé de deux plis d'ouate de cellulose crêpée liés entre eux par adhésif. Ce dernier est réparti selon un motif constitué de surfaces ponctuelles rapprochées les unes des autres et laissant des parties substantielles des deux plis non liées. De 4 à 8 % de la surface seulement est liée et les deux plis, dont les lignes de crêpage sont parallèles, ne sont pas tendus de la même façon. On obtient cet écart de tension en étirant différemment les deux plis avant qu'ils ne soient liés l'un à l'autre le long du dit motif. Un tel contrôle des tensions permet, après que l'adhésif a été fixé, que l'un des plis se contracte plus que l'autre. Il en résulte une tendance à la séparation des plis dans les parties non liées entre les zones avec adhésif.The patent is known US 3,673,060 ; it describes a product, a napkin for example, formed of two folds of creped cellulose wadding bonded together by adhesive. The latter is distributed in a pattern consisting of point surfaces close to each other and leaving substantial portions of the two unbound plies. From 4 to Only 8% of the surface is bound and the two plies, whose crepe lines are parallel, are not stretched in the same way. This voltage difference is obtained by stretching the two plies differently before they are bonded to each other along the said pattern. Such tension control allows, after the adhesive has been fixed, that one of the folds contracts more than the other. This results in a tendency to separate the folds in the unbonded portions between the adhesive areas.

Le brevet enseigne d'appliquer l'adhésif sur un pli au moyen d'un rouleau applicateur convenablement gravé. On dépose ensuite le second pli sur le premier puis on entraîne les deux plis entre deux cylindres de calandrage dont l'un est gravé et en phase avec le rouleau applicateur. Enfin la feuille est entraînée entre deux cylindres en acier gravés, pour y être gaufrée le long des bords de ce qui sera la serviette après découpage. Ce procédé paraît ainsi d'application limitée à la fabrication d'un produit de type serviette au pourtour gaufré.The patent teaches applying the adhesive to a fold by means of a suitably etched applicator roll. The second ply is then deposited on the first and the two plies are drawn between two calendering rolls, one of which is etched and in phase with the applicator roll. Finally the sheet is driven between two engraved steel cylinders, to be embossed along the edges of what will be the towel after cutting. This process thus appears to be limited to the manufacture of a wafer-type product with an embossed periphery.

En outre la surface recommandée de la partie non liée entre deux zones liées adjacentes est de l'ordre 0,65 cm2. Elle est relativement faible. Selon l'exemple donné, la surface des zones ponctuelles de liaison est de l'ordre de 2 mm2 avec un espacement de 4,75 mm. Il est mentionné dans le brevet que la feuille imite ainsi l'aspect et la texture d'un produit textile. De préférence, les picots sont répartis uniformément sur la feuille.In addition, the recommended area of the unbonded portion between two adjacent bonded areas is of the order of 0.65 cm 2 . It is relatively weak. According to the example given, the area of the connecting point areas is of the order of 2 mm 2 with a spacing of 4.75 mm. It is mentioned in the patent that the sheet thus mimics the appearance and texture of a textile product. Preferably, the spikes are evenly distributed on the sheet.

Le brevet français FR 2 105 116 décrit un procédé de fabrication d'une nappe à plusieurs épaisseurs de matière flexible, en papier ou en plastique, selon lequel on imprime une matière adhésive sur l'un des plis le long d'un motif, dit périphérique ouvert, représentant des losanges ou des carrés. Les deux plis ont été préalablement gaufrés selon un motif uniforme de protubérances et l'un des deux est mis sous tension longitudinalement de manière à donner à la feuille, après la découpe en serviettes, un aspect « capitonné ». On observe que les losanges sont très larges sinon sans doute la colle déposée le long de lignes continues créerait un produit relativement rigide. Ce brevet s'applique ainsi à des produits de types serviettes ou nappes de table.The patent French FR 2 105 116 discloses a method of manufacturing a multi-ply sheet of flexible material, paper or plastic, wherein is printed an adhesive material on one of the folds along a pattern, said open device, representing diamonds or squares. The two plies were previously embossed in a uniform pattern of protuberances and one of the two is tensioned longitudinally so as to give the sheet, after cutting into towels, a "padded" appearance. It is observed that the diamonds are very wide otherwise the glue deposited along continuous lines would create a relatively rigid product. This patent thus applies to products of the napkins type or tablecloths.

Le brevet US 3 650 882 décrit un papier, composé de trois plis d'ouate de cellulose, dans lequel le pli central est extensible et élastique et les plis extérieurs sont gaufrés et moins extensibles. Les plis sont liés le long de zones espacées de façon à laisser des parties non liées entre elles. A l'état humide le pli interne peut ainsi se détendre et occuper l'espace des parties non liées. On prévoit de lier le pli central aux plis externes alors qu'il est en extension par rapport à ces derniers. Lors du relâchement des tensions auxquelles la feuille est soumise, le pli central se rétracte et les autres plis se mettent en volume dans les parties non liées. Les zones liées et les parties non liées paraissent être de même étendue.The patent US 3,650,882 discloses a paper, consisting of three plies of cellulose wadding, wherein the central ply is extensible and elastic and the outer plies are embossed and less extensible. The folds are bound along spaced areas so as to leave unrelated portions together. In the wet state, the inner ply can thus relax and occupy the space of the unbound parts. It is expected to bind the central fold to the outer folds while it is extended relative to them. When the tensions to which the sheet is subjected are released, the central fold retracts and the other folds become visible in the unbound parts. Linked and unrelated areas appear to be of equal extent.

Le brevet US 4 469 735 décrit également un produit à plusieurs plis d'ouate de cellulose de caractéristiques d'allongement différentes pour permettre la formation de poches et une augmentation de leur volume d'absorption à l'état humide.The patent US 4,469,735 also discloses a multi-ply product of cellulose wadding of different elongation characteristics to allow the formation of pockets and an increase in their wet absorption volume.

La présente invention a pour objectif la réalisation d'un produit, constitué d'au moins deux plis d'ouate de cellulose crêpée, présentant un aspect attractif pour le consommateur, en particulier un aspect s'apparentant à celui d'un produit textile et qui est amélioré par rapport à l'état de la technique.The object of the present invention is to provide a product consisting of at least two folds of creped cellulose wadding, having an attractive appearance for the consumer, in particular an appearance similar to that of a textile product and which is improved compared to the state of the art.

L'invention a ainsi pour objet un produit composé d'au moins deux plis, un pli supérieur et un pli inférieur, d'ouate de cellulose crêpée, chacun de grammage compris entre 10 et 40 g/m2, dont le pli supérieur comprend des premières protubérances sur la face tournée vers le pli inférieur, par le sommet desquelles ils sont liés. Les dites premières protubérances sont réparties selon des alignements qui délimitent entre eux des cellules de surface comprise entre 1 et 20 cm2, le pli supérieur étant plus long dans le sens marche que le pli inférieur de 0,6 à 2% et étant lié au pli inférieur par les sommets des dites premières protubérances, de telle façon qu'il se forme des coussinets à l'intérieur des cellules.The subject of the invention is thus a product composed of at least two plies, an upper ply and a lower ply, of creped cellulose wadding, each weighting between 10 and 40 g / m 2 , the upper ply of which comprises first protuberances on the face turned to the lower fold, from the top of which they are linked. Said first protuberances are distributed in alignments which delimit between them surface cells of between 1 and 20 cm 2 , the upper fold being longer in the direction than the lower fold of 0.6 to 2% and being connected to the lower fold by the tops of said first protuberances, so that pads are formed inside the cells.

Par coussinet, selon le brevet, on comprend une zone dont les deux plis ne sont pas liés entre eux, et qui est délimitée par des alignements de premières protubérances formant un contour fermé. Le coussinet se caractérise par le fait que le pli supérieur paraît détaché du pli inférieur et crée un effet bombé.By pad, according to the patent, it includes a zone whose two folds are not interconnected, and which is delimited by alignments of first protuberances forming a closed contour. The pad is characterized by the fact that the upper fold seems detached from the lower fold and creates a convex effect.

Grâce à l'invention, on obtient un produit présentant une surface en relief avec des coussinets à l'intérieur des cellules définies par les alignements de protubérances, et dont l'aspect se rapproche de celui de produits textiles, molletonnés notamment. De manière avantageuse lorsque le produit se présente sous forme de rouleau, l'effet de coussinets en relief est particulièrement visible lorsqu'on déroule ce dernier.Thanks to the invention, there is obtained a product having a raised surface with pads inside the cells defined by the rows of protuberances, and whose appearance is similar to that of textile products, including fleeces. Advantageously when the product is in the form of a roll, the effect of relief pads is particularly visible when unrolling the latter.

Conformément à une autre caractéristique, les dits alignements sont constitués de premières protubérances espacées les unes des autres d'une distance inférieure à 3 mm. En effet au-delà de cet écartement les coussinets ne se forment pas convenablement. Les ondulations ont tendance à s'étendre dans le sens travers. Les premières protubérances constituant les contours des coussinets sont de préférence de forme tronconique avec une base circulaire ou ovale. Toutefois cette base peut aussi être de forme polygonale. Elle peut aussi présenter une forme très allongée donnant des empreintes selon des traits continus ou discontinus.According to another characteristic, said alignments consist of first protuberances spaced from each other by a distance of less than 3 mm. Indeed beyond this spacing the pads are not formed properly. The undulations tend to extend in the cross direction. The first protuberances constituting the contours of the pads are preferably of frustoconical shape with a circular or oval base. However, this base can also be of polygonal shape. It can also have a very elongated shape giving imprints in continuous or discontinuous lines.

Selon un mode de réalisation préféré, les protubérances ont une forme tronconique, notamment de section circulaire, et leur espacement le long des alignements est très faible. Il est, de préférence, inférieur au diamètre de la section de la protubérance.According to a preferred embodiment, the protuberances have a frustoconical shape, in particular of circular section, and their spacing along the alignments is very small. It is preferably smaller than the diameter of the section of the protuberance.

Les alignements peuvent être rectilignes ou ondulés. Selon un mode de réalisation particulier ils forment un réseau, dont les dites cellules sont définies par leurs intersections. En particulier elles ont une forme sensiblement en losange et les côtés des derniers sont ondulés. Un tel exemple de motif est décrit dans le brevet US 5 436 057 .The alignments can be rectilinear or corrugated. According to a particular embodiment, they form a network, whose said cells are defined by their intersections. In particular they have a substantially diamond-shaped shape and the sides of the latter are corrugated. Such an example of a pattern is described in the patent US 5,436,057 .

Selon un autre mode de réalisation, à l'intérieur des dites cellules, le pli supérieur est gaufré selon un motif constitué des secondes protubérances. Celles-ci sont tronconiques ou bien présentent un sommet de forme linéaire. Le sommet des deuxièmes protubérances est libre, c'est à dire qu'il n'est pas collé ou autrement lié au second pli.According to another embodiment, inside said cells, the upper fold is embossed in a pattern consisting of the second protuberances. These are frustoconical or have a vertex of linear form. The top of the second protuberances is free, ie it is not glued or otherwise bound to the second fold.

Le deuxième pli est gaufré ou non.The second fold is embossed or not.

La présente invention a également pour objet un procédé permettant de réaliser un produit à au moins deux plis d'ouate de cellulose crêpée, de grammage compris entre 10 et 40 g/m2.The present invention also relates to a process for producing a product with at least two folds of creped cellulose wadding, weight of between 10 and 40 g / m 2 .

Le procédé de l'invention est caractérisé en ce qu'il comprend au moins les étapes suivantes :

  • on déroule une première bande d'ouate de cellulose depuis une bobine mère et on la gaufre sur un cylindre de gaufrage gravé selon un motif constitué au moins de premières protubérances formant des alignements qui définissent entre eux des cellules fermées,
  • on déroule une deuxième bande d'ouate de cellulose depuis une bobine mère, on applique la deuxième bande sur la première, et
  • on lie les deux bandes en mettant en contact les deux bandes par les sommets des premières protubérances.
The method of the invention is characterized in that it comprises at least the following steps:
  • a first strip of cellulose wadding is unwound from a mother roll and embossed on an embossing roll engraved in a pattern consisting of at least first protuberances forming alignments which define between them closed cells,
  • a second strip of cellulose wadding is unwound from a reel, the second band is applied to the first, and
  • the two bands are connected by contacting the two bands by the tops of the first protuberances.

Conformément à l'invention, au moment de la liaison des plis, ceux-ci sont différenciés de manière à ce que, au repos, la longueur des plis soit différente de plus de 0,6%, de préférence de 0,6 à 2%. On enroule ensuite la bande obtenue autour d'un mandrin -et on tronçonne le dit rouleau en rouleaux plus petits.According to the invention, at the time of binding of the folds, these are differentiated so that, at rest, the length of the folds is different from more than 0.6%, preferably from 0.6 to 2 %. The resulting band is then wrapped around a mandrel and said roll is cut into smaller rolls.

Les deux bandes se différencient l'une de l'autre par l'une ou l'autre des caractéristiques suivantes prises seules ou en combinaison : la vitesse de déroulement, la tension dans le sens marche, le niveau ou la profondeur du gaufrage, et l'élasticité.The two bands differ from each other by one or the other of the following characteristics taken alone or in combination: the unwinding speed, the tension in the running direction, the level or the depth of the embossing, and elasticity.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui suit, à titre d'exemple non limitatif, d'un mode de réalisation en référence aux dessins annexés sur lesquels

  • La figure 1 représente une vue de dessus d'une feuille conforme à l'invention
  • La figure 2 est une vue en coupe selon II-II de la figure 1
  • La figure 3 représente de façon schématique une installation permettant de réaliser une feuille conforme à l'invention.
Other characteristics and advantages of the invention will emerge from the description which follows, by way of non-limiting example, of an embodiment with reference to the appended drawings in which:
  • FIG. 1 represents a view from above of a sheet according to the invention
  • Figure 2 is a sectional view along II-II of Figure 1
  • Figure 3 schematically shows an installation for producing a sheet according to the invention.

La feuille, représentée sur les figures 1 et 2, est composée de deux plis d'ouate de cellulose crêpée. L'ouate de cellulose peut être du type obtenu selon un procédé par pressage humide conventionnel de la feuille, et désigné dans le domaine par CWP ou bien selon un procédé comprenant une étape de séchage par soufflage d'air traversant de type TAD. Le grammage pour chacun des plis est compris entre 10 et 40g/m2. Pour une application comme papier toilette, on choisit de préférence un grammage compris entre 15 et 24 g/m2. On distingue un pli supérieur (10) et un pli dit inférieur (20). L'ouate de cellulose est crêpée avec les ondulations, comme cela est connu, orientées toutes, perpendiculairement à la direction du défilement de la machine. Le nombre de lignes de crêpage est compris entre 40 et 80 lignes par cm.The sheet, shown in Figures 1 and 2, is composed of two folds of creped cellulose wadding. The cellulose wadding may be of the type obtained according to a method by conventional wet pressing of the sheet, and designated in the field by CWP or according to a method comprising a step of TAD type through air blowing drying. The grammage for each of the plies is between 10 and 40 g / m 2 . For an application as a toilet paper, a weight of between 15 and 24 g / m 2 is preferably chosen. There is an upper fold (10) and a lower fold (20). The cellulose wadding is creped with the corrugations, as is known, oriented all, perpendicular to the direction of travel of the machine. The number of crepe lines is between 40 and 80 lines per cm.

Ainsi les plis présentent un taux d'allongement à la rupture d'au moins 25%. De préférence il n'est pas inférieur à 20%.Thus, the plies exhibit a degree of elongation at break of at least 25%. Preferably it is not less than 20%.

Conformément à l'invention, le pli supérieur comprend des protubérances (12) sur la face du pli qui est tournée vers le pli inférieur. Ces protubérances étant formées par gaufrage, une cavité leur correspond sur la face tournée vers l'extérieur de la feuille. Elles ont une section dans le plan de la feuille qui peut être circulaire, ovale ou bien polygonale. Une pellicule de colle appliquée entre le sommet de ces premières protubérances et le pli inférieur rend les deux plis solidaires l'un de l'autre.According to the invention, the upper fold comprises protuberances (12) on the face of the fold which is turned towards the lower fold. These protuberances being formed by embossing, a cavity corresponds to them on the side facing the outside of the sheet. They have a section in the plane of the leaf that can be circular, oval or polygonal. A film of adhesive applied between the top of these first protuberances and the lower fold makes the two plies integral with one another.

Les protubérances forment des alignements (14). On peut définir un alignement comme une succession de protubérances présentant consécutivement les plus faibles écartements. Dans le mode de réalisation représenté, les alignements sont ménagés selon deux directions sensiblement à 90° l'une de l'autre de telle façon qu'ils se croisent en formant un réseau et des cellules régulières (16).The protuberances form alignments (14). An alignment can be defined as a succession of protuberances having consecutively the smallest spacings. In the embodiment shown, the alignments are arranged in two directions substantially at 90 ° to each other so that they intersect forming a network and regular cells (16).

Conformément à un mode préféré de l'invention, les cellules (16) ont une forme de parallélogramme de préférence de losange. Le rapport de la longueur, sa plus grande dimension, sur la largeur, la plus grande dimension mesurée transversalement à la première, n'est pas supérieur à 5, de préférence il n'est pas supérieur à 1,5. Les côtés du parallélogramme sont rectilignes ou bien de forme ondulée comme cela est représenté sur la figure 1.According to a preferred embodiment of the invention, the cells (16) have a preferably parallelogram shape of a diamond. The ratio of the length, its largest dimension, to the width, the largest dimension measured transversely to the first, is not greater than 5, preferably not more than 1.5. The sides of the parallelogram are rectilinear or of corrugated shape as shown in FIG.

Le pli supérieur reste décollé du pli inférieur au niveau des cellules. Cela signifie que sa dimension dans le sens marche est supérieure à celle du pli inférieur. L'analyse montre que la longueur du pli supérieur doit au moins être plus grande que celle du pli inférieur de 0,6 % au moins pour que l'on constate la formation de coussinets sur le pli supérieur.The upper fold remains detached from the lower fold at the level of the cells. This means that its dimension in the running direction is greater than that of the lower fold. The analysis shows that the length of the upper fold must at least be greater than that of the lower fold by at least 0.6% for the formation of bearings on the upper fold.

Une autre condition nécessaire est la distance séparant deux protubérances adjacentes le long d'un alignement. En effet si l'écartement dépasse un certain seuil, les coussinets ne se forment pas. Certes des ondulations existent, en raison de la différence de longueur entre les deux plis, mais elles sont irrégulières. On a constaté que les coussinets ne se forment que si cette distance entre les protubérances reste inférieure à 3 mm.Another necessary condition is the distance separating two adjacent protuberances along an alignment. Indeed if the spacing exceeds a certain threshold, the pads are not formed. Certain undulations exist because of the difference in length between the two folds, but they are irregular. It has been found that the pads are formed only if this distance between the protuberances remains less than 3 mm.

A l'intérieur des cellules (16), on peut prévoir comme cela est représenté sur les figures, un gaufrage secondaire formé de secondes protubérances (18). Ces protubérances (18) ont une hauteur de gaufrage inférieure à celle des premières protubérances (12). Elles ne forment pas de zones de liaison du pli supérieur avec le pli inférieur.Inside the cells (16), it can be provided as shown in the figures, a secondary embossing formed of second protuberances (18). These protuberances (18) have a lower embossing height than that of the first protuberances (12). They do not form binding zones of the upper fold with the lower fold.

Un procédé de fabrication d'une feuille conforme à l'invention et correspondant à un mode de réalisation tel que représenté sur la figure 3 est décrit ci-après. On déroule une première bande continue d'ouate de cellulose (10) depuis une bobine mère (100) qui est montée sur un support rotatif. On entraîne cette bande à une certaine vitesse à travers un groupe de gaufrage comprenant un cylindre (102) à surface rigide et gravée et un cylindre (104) à surface en matière résiliante telle que le caoutchouc. Le motif de la gravure du cylindre rigide est par exemple celui de la figure 1, avec des premiers éléments en relief ou picots à un premier niveau de gravure pour la réalisation des premières protubérances et des seconds éléments en relief à un niveau inférieur au premier pour la réalisation des secondes protubérances. Les gravures de cylindres de gaufrage à deux niveaux sont connues de l'homme de l'art.A method of manufacturing a sheet according to the invention and corresponding to an embodiment as shown in Figure 3 is described below. A first continuous web of cellulose wadding (10) is unrolled from a reel (100) which is mounted on a rotatable support. This strip is driven at a certain speed through an embossing group comprising a cylinder (102) with a rigid and etched surface and a cylinder (104) with a surface of resilient material such as rubber. The pattern of the engraving of the rigid cylinder is for example that of FIG. 1, with first elements in relief or pins at a first etching level for producing the first protuberances and second elements in relief at a level lower than the first for the realization of the second protuberances. Engravings of two-level embossing rolls are known to those skilled in the art.

La bande après gaufrage, reçoit une pellicule de colle qui est déposée sur les surfaces en relief, c'est à dire celles du motif de gaufrage, par un cylindre (106) applicateur connu en soi. Le motif de la gravure du cylindre rigide correspond aux premières protubérances. Il peut également être constitué de protubérances de profondeurs différentes. Dans ce cas, la pellicule de colle est déposée uniquement sur les protubérances au relief le plus haut. L'adhésif est une colle à l'eau, par exemple une colle polyvinylique courante dans le domaine de l'invention.The strip after embossing, receives a film of adhesive which is deposited on the raised surfaces, that is to say those of the embossing pattern, by a cylinder (106) applicator known per se. The etching pattern of the rigid cylinder corresponds to the first protuberances. It may also consist of protuberances of different depths. In this case, the adhesive film is deposited only on the protuberances with the highest relief. The adhesive is a water-based adhesive, for example a polyvinyl glue common in the field of the invention.

Selon un autre mode de réalisation, la liaison des plis est obtenue de façon mécanique ou de toute autre façon connue de l'homme de l'art.According to another embodiment, the binding of the folds is obtained mechanically or in any other manner known to those skilled in the art.

On applique ensuite le deuxième pli sur le premier au moyen d'un cylindre marieur (108). Le deuxième pli (20) vient d'une bobine mère (200) que l'on déroule à une vitesse déterminée. La pression exercée par le cylindre marieur assure la liaison des plis l'un à l'autre. La feuille double est ensuite entraînée en étant maintenue sous tension vers le poste de fabrication des « logs ». Un « log » est un rouleau intermédiaire au diamètre du produit après qu'il a été fini et de largeur égale à la laize de la bobine mère. Une fois formé, le log est entraîné vers un poste de sciage où il est tronçonné. Enfin les rouleaux obtenus sont guidés vers les postes d'emballage, de conditionnement et de stockage.Then apply the second fold on the first by means of a marrying cylinder (108). The second fold (20) comes from a mother coil (200) which is unwound at a determined speed. The pressure exerted by the marrying cylinder ensures the binding of the folds to one another. The double sheet is then driven while being kept under tension to the "log" production station. A "log" is an intermediate roll to the diameter of the product after it has been finished and of width equal to the width of the mother reel. Once formed, the log is driven to a sawing station where it is cut. Finally, the rolls obtained are guided to the packaging, packaging and storage stations.

Conformément à l'invention, on règle la tension de l'une des deux bandes d'ouate de cellulose par rapport à l'autre en amont de la station où les plis sont liés l'un à l'autre. Il s'agit de permettre au pli inférieur de se rétracter plus que l'autre lorsque les tensions sont relâchées. A cette fin, on peut prévoir un groupe de tirage (disposé en amont de la station où les deux plis sont liés l'un à l'autre). En ralentissant par exemple la vitesse du pli inférieur de 0,6% à 2% par rapport à la vitesse du gaufreur, on reste dans la plage de déformation élastique et on augmente le niveau de tension du pli. Lorsque l'on relâche ultérieurement cette tension, le pli inférieur se rétracte proportionnellement et les coussinets se forment à la surface du pli supérieur. En particulier, lorsque le pli inférieur est non gaufré comme cela est représenté sur la figure 3. La différence de tension entre le pli inférieur et le pli supérieur est alors créée par le gaufrage qui modifie les caractéristiques physiques du pli supérieur. Le pli inférieur conservant quant à lui son élasticité, il se rétractera davantage.According to the invention, the tension of one of the two cellulose wadding strips is adjusted with respect to the other upstream of the station where the plies are bonded to one another. This is to allow the lower fold to retract more than the other when the tensions are released. For this purpose, it is possible to provide a draw group (located upstream of the station where the two folds are linked to each other). By slowing down, for example, the speed of the lower ply by 0.6% to 2% with respect to the speed of the embosser, one remains in the elastic deformation range and the level of tension of the ply is increased. When this tension is released later, the lower fold retracts proportionally and the pads form on the surface of the upper fold. In particular, when the lower ply is unembossed as shown in Fig. 3. The difference in tension between the lower ply and the upper ply is then created by the embossing which modifies the physical characteristics of the upper ply. The lower fold maintaining its elasticity, it will retract more.

On a réalisé des produits selon ce procédé, et mesuré les différences de longueur entre les deux plis.Products were made according to this method, and length differences between the two plies were measured.

La méthode de mesure a consisté à :

  • mesurer la longueur de 10 coupons consécutifs sur un rouleau,
  • séparer les deux en faisant attention à ne pas déchirer le papier aux points de collage ni l'étirer au-delà de sa limite de déformation élastique, et
  • étaler les deux plis sous une règle métallique et mesurer l'écart de longueur en sens marche.
The measurement method consisted of:
  • measure the length of 10 consecutive coupons on a roll,
  • separate the two, being careful not to tear the paper at the bonding points or stretch it beyond its limit of elastic deformation, and
  • spread the two folds under a metal ruler and measure the length difference in the running direction.

Pour calculer le pourcentage relatif d'écart (ER) de longueur entre les plis, on a tenu compte du fait qu'à l'enroulement le pli extérieur est plus long.To calculate the relative percentage of difference (ER) in length between the folds, it has been taken into account that in winding the outer fold is longer.

On applique la formule :

  • ER=(100/L1x{L2-L1x(D12-Din2)/(D1+D2)x2xNxL]}, où les paramètres sont définis ci-dessous :
  • L1 est la longueur de 10 coupons, et D1 le diamètre initial du rouleau.
  • L2 est l'écart de longueur mesuré entre les deux plis, D2 le diamètre après avoir enlevé 10 coupons.
  • Din est le diamètre du mandrin, N le nombre de feuilles initial, et L la longueur unitaire d'un coupon.
We apply the formula:
  • ER = (100 / L1x {L2-L1x (D1 2 -Din 2 ) / (D1 + D2) x2xNxL]}, where the parameters are defined below:
  • L1 is the length of 10 coupons, and D1 is the initial diameter of the roll.
  • L2 is the difference in length measured between the two folds, D2 the diameter after removing 10 coupons.
  • Din is the diameter of the mandrel, N is the initial number of sheets, and L is the unit length of a coupon.

Exemple 1Example 1

On a fabriqué deux produits avec la même ouate de cellulose dont les caractéristiques sont les suivantes (mesures effectuées sur 2 plis) :

  • Grammage 40.3 g/m2.
  • Résistance sens marche : 215 N/m. Il s'agit de la valeur de la force nécessaire pour rompre une éprouvette découpée dans le sens marche de la feuille, ramenée à un mètre de largeur.
  • Résistance sens travers : 75 N/m. idem ci-dessus, mais l'éprouvette a été découpée dans le sens perpendiculaire au précédent.
  • Taux d'allongement à la rupture : 16 %.(mesuré dans le sens marche)
Two products were manufactured with the same cellulose wadding, the characteristics of which are as follows (measurements made on 2 plies):
  • Weight 40.3 g / m 2 .
  • Resistance in the direction of operation: 215 N / m. This is the value of the force required to break a specimen cut in the direction of the sheet, reduced to one meter in width.
  • Cross-directional resistance: 75 N / m. same as above, but the specimen was cut in the direction perpendicular to the previous one.
  • Elongation at break: 16% (measured in the direction of travel)

Les produits ont été fabriqués selon le procédé décrit plus haut. Le pli supérieur était gaufré selon le motif représenté à la figure 1, le pli inférieur n'était pas gaufré.The products were manufactured according to the method described above. The upper fold was embossed in the pattern shown in Figure 1, the lower fold was not embossed.

On a fabriqué un premier produit en appliquant une différence de tension entre les plis, de telle manière que le produit final présente un effet coussinet marqué. On a fabriqué un second produit en réduisant l'écart de tension entre les deux plis de telle façon que le produit final ne présente pas d'effet coussinet.A first product was manufactured by applying a difference in tension between the plies, so that the final product has a pronounced pad effect. A second product was manufactured by reducing the tension gap between the two folds so that the final product had no cushioning effect.

On a procédé à dix mesures sur chacun des produits. Les écarts moyens relatifs mesurés sont les suivants :

  • Premier produit : 1.12%
  • Second produit : 0.23%
Ten measurements were made on each product. The relative average differences measured are as follows:
  • First product: 1.12%
  • Second product: 0.23%

Exemple 2 Example 2

Afin d'évaluer la méthode d'analyse précédente et de vérifier si le résultat obtenu est significatif, on a réalisé un troisième produit en gaufrant ensemble deux plis selon le motif de la figure 1. L'ouate de cellulose présentait les caractéristiques suivantes : grammage, 40.3 g/m2 ; résistance MD, 215 N/m ; résistance CD, 75 N/m ; avec un taux d'allongement à la rupture de 16%.In order to evaluate the previous method of analysis and to verify whether the result obtained is significant, a third product was produced by embossing two plies together according to the pattern of FIG. 1. The cellulose wadding had the following characteristics: grammage 40.3 g / m 2 ; MD strength, 215 N / m; CD resistance, 75 N / m; with an elongation rate at break of 16%.

Dix mesures ont été effectuées sur le produit. Les écarts moyens relatifs mesurés ont été de 0.15%. Cela permet de conclure que la différence de longueur mesurée entre deux produits dont l'un présente un effet coussinet et l'autre pas est significative.Ten measurements were made on the product. The relative average differences measured were 0.15%. This makes it possible to conclude that the difference in length measured between two products, one of which has a cushioning effect and the other is not significant.

Claims (10)

  1. Paper sheet consisting of at least two plies (10, 20) of creped cellulose wadding, namely an upper ply (10) and a lower ply (20), each having a substance in the range from 10 to 40 g/m2, the upper ply (10) being embossed and provided with first protuberances (12) formed by embossing and distributed along alignments (14) which delimit cells (16) between them, characterized in that the cells (16) have surface areas in the range from 1 to 20 cm2, and in that the upper ply (10) is longer in the machine direction than the lower ply (20) by at least 0.6%, preferably from 0.6% to 2%, and is joined to it by the tips of the first protuberances (12) in such a way that pads are formed within the cells (16).
  2. Paper sheet according to the preceding claim, characterized in that the cells (16) have a length/width ratio in the range from 1 to 5, and preferably from 1 to 1.5.
  3. Paper sheet according to any one of the preceding claims, characterized in that the distance between two adjacent protuberances (12) along an alignment (14) is not more than 3 mm, and preferably not more than 1.5 mm.
  4. Paper sheet according to the preceding claim, characterized in that the protuberances (12) are of truncated conical shape, with a base diameter in the range from 1 to 3 mm, and preferably from 1 to 1.5 mm.
  5. Paper sheet according to any one of the preceding claims, characterized in that the alignments (14) are arranged in two different directions forming the said cells (16) between them.
  6. Paper sheet according to any one of the preceding claims, characterized in that it takes the form of a roll.
  7. Method for making a sheet according to any one of the preceding claims, comprising the following steps:
    - a first strip (10) of cellulose wadding is unwound from a parent reel, and is embossed on an engraved embossing cylinder (102) with a pattern having at least first protuberances forming alignments which delimit closed cells between them,
    - a second strip (20) of cellulose wadding is unwound from a parent reel,
    - the second strip is applied to the first, and the two strips are joined by the tips of the first protuberances (12), characterized in that the two strips (10, 20) are differentiated at the time of the joining of the plies in such a way that, at rest, the lengths of the plies differ by at least 0.6% and preferably 0.6% to 2%,
    - the resulting double strip is wound around a core while tension is applied, and
    - the said roll is cut into smaller rolls.
  8. Method according to the preceding claim, characterized in that the plies differ from each other in respect of the following characteristics, considered individually or in combination: the unwinding speed, the tension in the machine direction, the embossing depth, and the elasticity.
  9. Method according to either one of Claims 7 and 8, characterized in that the two plies are joined by applying adhesive (106) to the tips of the first protuberances.
  10. Method according to either one of Claims 7 and 8, characterized in that the two plies are joined by mechanical pressure on the tips of the first protuberances.
EP01400629A 2001-03-09 2001-03-09 Paper sheet with small cushions Expired - Lifetime EP1239079B1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
DK01400629T DK1239079T3 (en) 2001-03-09 2001-03-09 Path of paper with small pillows
AT01400629T ATE364751T1 (en) 2001-03-09 2001-03-09 PAPER TRACK WITH SMALL CUSHIONS
DE60128890T DE60128890T2 (en) 2001-03-09 2001-03-09 Paper web with small pillows
ES01400629T ES2287087T3 (en) 2001-03-09 2001-03-09 PAPER SHEET WITH SMALL CUSHIONS.
PT01400629T PT1239079E (en) 2001-03-09 2001-03-09 Paper sheet with small cushions
EP01400629A EP1239079B1 (en) 2001-03-09 2001-03-09 Paper sheet with small cushions
PCT/FR2002/000770 WO2002072956A1 (en) 2001-03-09 2002-03-04 Paper sheet with pillows
US10/275,487 US7846531B2 (en) 2001-03-09 2002-03-04 Padded paper sheet
CA002406480A CA2406480C (en) 2001-03-09 2002-03-04 Paper sheet with pillows
RU2002129596/12A RU2295600C2 (en) 2001-03-09 2002-03-04 Paper sheet with pads and method for producing the same
NO20025389A NO333379B1 (en) 2001-03-09 2002-11-11 Sheets of pillows
CY20071101162T CY1106854T1 (en) 2001-03-09 2007-09-10 PAPER SHEET WITH PILLOW

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01400629A EP1239079B1 (en) 2001-03-09 2001-03-09 Paper sheet with small cushions

Publications (2)

Publication Number Publication Date
EP1239079A1 EP1239079A1 (en) 2002-09-11
EP1239079B1 true EP1239079B1 (en) 2007-06-13

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EP01400629A Expired - Lifetime EP1239079B1 (en) 2001-03-09 2001-03-09 Paper sheet with small cushions

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US (1) US7846531B2 (en)
EP (1) EP1239079B1 (en)
AT (1) ATE364751T1 (en)
CA (1) CA2406480C (en)
CY (1) CY1106854T1 (en)
DE (1) DE60128890T2 (en)
DK (1) DK1239079T3 (en)
ES (1) ES2287087T3 (en)
NO (1) NO333379B1 (en)
PT (1) PT1239079E (en)
RU (1) RU2295600C2 (en)
WO (1) WO2002072956A1 (en)

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WO2009117794A1 (en) * 2008-03-24 2009-10-01 Wagner Do Brasil Ltda Process of manufacturing a multilayer absorbent product and product obtained
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IT202100017675A1 (en) 2021-07-05 2023-01-05 Koerber Tissue S P A EMBOSSING DEVICE WITH AT LEAST ONE HEATED EMBOSSING ROLLER, AND METHOD
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Also Published As

Publication number Publication date
DK1239079T3 (en) 2007-10-08
ES2287087T3 (en) 2007-12-16
DE60128890T2 (en) 2008-02-07
EP1239079A1 (en) 2002-09-11
WO2002072956A1 (en) 2002-09-19
CA2406480C (en) 2010-01-12
RU2295600C2 (en) 2007-03-20
CA2406480A1 (en) 2002-09-19
NO333379B1 (en) 2013-05-21
PT1239079E (en) 2007-09-14
DE60128890D1 (en) 2007-07-26
NO20025389L (en) 2003-01-09
ATE364751T1 (en) 2007-07-15
US20040023003A1 (en) 2004-02-05
US7846531B2 (en) 2010-12-07
NO20025389D0 (en) 2002-11-11
CY1106854T1 (en) 2012-05-23

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