EP1362953A1 - Process for marking a paperweb, paperweb having a watermark pattern - Google Patents

Process for marking a paperweb, paperweb having a watermark pattern Download PDF

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Publication number
EP1362953A1
EP1362953A1 EP02010746A EP02010746A EP1362953A1 EP 1362953 A1 EP1362953 A1 EP 1362953A1 EP 02010746 A EP02010746 A EP 02010746A EP 02010746 A EP02010746 A EP 02010746A EP 1362953 A1 EP1362953 A1 EP 1362953A1
Authority
EP
European Patent Office
Prior art keywords
additive
sheet
roll
watermark
marking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02010746A
Other languages
German (de)
French (fr)
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EP1362953B1 (en
Inventor
Jean-Louis Neveu
Nicolas Pommier
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
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Publication date
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Priority to EP02010746A priority Critical patent/EP1362953B1/en
Priority to DK02010746T priority patent/DK1362953T3/en
Priority to PT02010746T priority patent/PT1362953E/en
Priority to AT02010746T priority patent/ATE295448T1/en
Priority to ES02010746T priority patent/ES2241925T3/en
Application filed by Georgia Pacific France SAS filed Critical Georgia Pacific France SAS
Priority to DE60204120T priority patent/DE60204120T2/en
Priority to US10/435,559 priority patent/US6824647B2/en
Priority to CA2428583A priority patent/CA2428583C/en
Publication of EP1362953A1 publication Critical patent/EP1362953A1/en
Publication of EP1362953B1 publication Critical patent/EP1362953B1/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/24Pressing or stamping ornamental designs on surfaces
    • 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
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/10Watermarks
    • 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
    • D21H25/00After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/005Mechanical treatment
    • 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
    • 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
    • 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
    • D21H21/00Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/26Agents rendering paper transparent or translucent
    • 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
    • D21H27/02Patterned paper

Definitions

  • the present invention relates to the field of papers for sanitary purposes or domesticated. Examples include toilet paper, hand towels or any wiping paper, napkins, etc.
  • cellulose wadding also known as tissue paper
  • tissue paper is generally used. It is a low weight absorbent paper, between 10 and 45 g / m 2 , obtained wet from paper fibers. It includes, possibly, chemical additives in small proportions, according to the use for which it is intended. It can be obtained by pressing the still wet sheet on a heated cylinder of large diameter, on which it is dried and from which it is then detached by means of a metal blade applied against it, transversely to its direction of rotation. This operation is intended to crepe the sheet which then has transverse corrugations to its direction walk. The crepe gives the sheet a certain elasticity at the same time as it increases its thickness and gives it tactile properties.
  • Another known method of manufacture comprises a first step of drying the sheet, at least in part, by means of a stream of hot air therethrough. This can then be creped or not.
  • the subject of the invention is a method of marking a sheet consisting of a or several plies of cellulose wadding to obtain a pattern simulating a watermark.
  • marking refers to the compression of certain parts on one side of the sheet to form compacted areas and significantly reduce its thickness in these areas, without formation of a corresponding relief on the opposite side of leaf.
  • a watermark is the impression of a drawing in the thickness or body of the paper, which is visible by transparency.
  • the watermark is called a "wet” watermark or “True” when it is produced during paper making, in the wet phase of the process before drying. It is produced, for example, by the imprint of a motif arranged on a rotating cylinder in contact with the still wet sheet.
  • a dry or simulated watermark is an impression of appearance similar to a true watermark, produced on paper after its manufacture.
  • the applicant in its patent EP-B-0 864 014, proposed the application of a motive pattern simulating a watermark to a sheet of absorbent paper made of cellulose wadding.
  • the method consists in deforming the sheet under stress by passing between a hard etched roll and a receiving roll having a surface hardness greater than 40 Shore D under a specific pressure of at least 150 kg / cm 2 with a marking speed of less 50m / min.
  • the engraved cylinder is made of steel and heated to a temperature of from 50 ° C to 100 ° C. Small quantities of water may be added.
  • the method makes it possible to obtain a product with a pattern simulating a watermark, the marked surface being smooth, shiny and translucent with a thin relative to its extent.
  • the applicant has sought to improve this process, and in particular to obtain a strongly contrasting filigree pattern without having to use means of heater.
  • the method of the invention achieves this objective.
  • the method of the invention for marking a pattern simulating a watermark on a sheet composed of at least one ply of cellulose wadding, consisting of deforming constrains the sheet between a first smooth surface rigid roll and at least one second rigid roller provided with elements in relief, is characterized by the fact that cold apply a film of an additive, favoring the formation of the watermark, on to least one of the surfaces of the sheet during the marking operation.
  • the additive is based on mineral oil.
  • the additive is applied on the surface and penetrates into the thickness of the leaf at the same time that it is distorted. It is applied cold, that is to say without external heat input, to ambient temperature. This gives an optimum result with simple means.
  • the additive is applied to the first roll, to the elements relief of the second roll or on both rolls.
  • the decoration is perfectly clear, both on the marked side and on the opposite side.
  • the additive may be applied directly on the roll or rollers during the marking operation.
  • the additive is applied by coating.
  • the coating can be carried out by means of a device comprising a screen cylinder.
  • the additive is applied by contact with the surface to be coated, here the roll or rolls, with an absorbent means impregnated with the additive.
  • the additive is then transferred from the surface of the roll or rolls onto the surfaces of the sheet, during the marking operation.
  • the finished product contains less than 1% by weight, preferably between 0.2 and 1% and preferentially still between 0.2 and 0.5% of additive in mass relative to the mass of the leaf.
  • the additive is a white mineral oil, suitable for medicinal or food applications. Its dynamic viscosity at temperature ambient temperature, of the order of 25 ° C, is between 15 and 80, preferably between 20 and 30 mPa.s, according to the NFT60-100 standard.
  • the elements in relief on the second roll form units unitary surface area of between 20 and 50 mm 2 and preferably between 30 and 40 mm 2 .
  • the raised elements comprise portions of continuous shape, preferably linear.
  • the ratio of the marked area to the total area of the sheet is less than 20%.
  • a force is exerted on the second roller corresponding to a linear pressure on the sheet of between about 20 and about 100 kg / cm 2, preferably between 40 and 90 kg / cml.
  • the sheet is deformed between a first roll extending across the width of the width of the sheet and at least a second roll of width between 15 and 90 mm.
  • each roll can be formed of an assembly of several discs.
  • the sheet obtained comprising at least one ply of cellulose wadding weighing between 10 and 45 g / m 2 , having a marked zone simulating a watermark, is characterized in that it is impregnated with additive, in particular with mineral oil.
  • additive in particular with mineral oil.
  • the amount of additive is less than 1% by weight relative to the mass of the sheet.
  • a sheet 8 composed of at least one fold cellulose wadding, here two, is unwound from at least one coil. She is guided, via at least one detour or guide roll (not referenced) up to pass between a first roll 1 whose surface is smooth and a plurality of second rollers 2 provided with relief elements.
  • the first roll presents a rotation axis YY '.
  • the rollers 2 are etched and are for example mounted on a common axis XX ', which is parallel to YY'. It is also part of the the invention to have the second rollers 2 on two or more axes parallel.
  • the second rollers 2 may each have a width between 15 and 90 mm, for example 80 mm. They can be spaced apart others to form decorated strips on the sheet to be treated.
  • the elements in relief on the engraved wheels 2 are of complex shape, continuous or formed of continuous assemblies (open or closed). Without leaving the framework of the invention, it is possible to wedge the knurls 2 so as to obtain a pattern which extends over all or part of the surface of the sheet. Between rolls 1 and 2, there is compression of the sheet 8. Means for exerting force on the second rolls corresponding to a linear pressure between about 20 and 100 kg / cm 2, preferably between 40 and 90 kg / cm 2.
  • the sheet 8 is covered on at least one of its surfaces of an additive based on mineral oil, such as petroleum jelly.
  • mineral oil such as petroleum jelly.
  • using a white mineral oil, medicinal or food in any case suitable for use in direct, indirect or indirect food contact occasional.
  • an oil marketed under the trade name Primol is used. or Marcol by ESSO SAF. It is a colorless liquid whose viscosity dynamic at 25 ° C is advantageously between 20 and 25 mPa.s.
  • Means 3 and 4 for applying the additive are provided. These means may coat either the engraved rollers 2, the smooth roll 1, or the two types of rollers. Depending on the case, they are in contact with one and / or the other of said rolls.
  • the means 3 and 4 may be of any type known per se, with a reserve 5 for the additive and an absorbent material which makes it possible to transfer the additive from the reserve 5 to the associated roller 1 or 2.
  • the absorbent material may be based on textile fibers with a density of between 200 and 450 g / m 2 / mm, for example 225 g / m 2 / mm.
  • the additive is preferentially applied to its entire contact surface and oriented along the generator.
  • the vertices of the relief patterns are coated with additive.
  • the process of the invention is particularly advantageous in installations which mark downtime after winding a log or rolls, known in the art as "Stop & go”.
  • the visual contrast effect is really accentuated when the quantity of additive deposited and measurable on the sheet, is less than 1% by weight relative to the total mass of the sheet.
  • the application pressure of the means 2 against the means 1 is at least 60 kg / cml (kg per linear cm measured along the generator of contact).
  • the elements in relief on the rollers 2 have surfaces of the order of 20 to 50 mm 2 , and preferably 30 to 40 mm 2 . They are arranged on the second roller 2 so that it remains in continuous support on the smooth roller 1 so as to avoid vibrations.
  • the patterns are of any shape, linear or not; an example is given on the Figure 3 where 9 feather patterns appear in dark on a light background. In made on a sheet of cellulose wadding, the patterns form a contrast with the bottom of the sheet 8.
  • the sheet 8 may be formed of one or more plies. In the latter case, notes an association of the folds between them in the zones containing the decor. of the wide sheets can be decorated by the method according to the invention.
  • a example of decor is given in Figure 3.
  • An appropriate implementation of the invention then consists in providing at least a first set of etched means 2 arranged along a first axis XX ', and that a second set of engraved means arranged along a second axis different and parallel to the first (XX '), the axes being parallel to the axis YY' of the smooth roll 1.
  • the first and second axes of the second engraved means can for example, to be arranged diametrically opposed with respect to the smooth roll.
  • each of the first axes (XX '), the engraved means such as knurled wheels, are placed at a certain distance from each other. So, in case of damage or wear, the replacement of a wheel is easy. If they are arranged along two axes, the engraved rollers 2 are preferably placed in staggered rows.
  • the products covered by the invention are, for example, rolls of paper hygienic, napkins, towels or rolls for industrial wiping.
  • a localized decoration for example at the edge of the product can be provided.
  • a decoration distributed over the entire surface of the product may, however, be provided for hygienic paper or industrial wiping applications.
  • the quantity of additive impregnated on the sheet that is to say the percentages by mass of additive present in the sheet thus obtained by the device described.
  • the measure consisted in extracting the additive by chloroform gravimetrically. This method is recalled below.
  • a control sample with additive and a sample without additive are made.
  • the rate of additive corresponds to the rate of extract of the sample with additive reduced by Sample extract without additive.
  • the quantities thus measured of additive are indicated in% in the table below.
  • the thickness of a sheet is determined according to ENV 12625-3 and is not increased by the process according to the invention.
  • the thickness of the unlabelled base sheet is about 0.224 mm.
  • Linear pressure Kg / cml Sheet speed m / min Thickness of the sheet mm Differences in gray levels Additive% face (6) face (7) 43.75 100 0.226 + - 0.01 34 36 0.37 65.62 100 0.237 + - 0.01 56 54 0.45 87.5 100 0.239 + - 0.01 60 54 0.35
  • the method described in patent EP 864014 consists in illuminating the sheet means of an optical fiber and a light diffuser, and to measure the level of gray using a CCD camera and a Leica Quantilet 600S image analyzer.
  • the average gray level of a marked surface is measured in delimiting a small closed area. We delimit an unmarked area of surface corresponding to this marked area and measure the average level of Grey.

Abstract

The marking procedure, for use on paper with at least one layer of cellulose wadding, consists of deforming the paper under pressure between a first rigid roller (1) with a smooth surface, and at least one secondary rigid roller (2) with relief elements, and includes the cold application of an additive coating that promotes the formation of a watermark on at least one surface of the paper or rollers during the marking operation. The additive is based on mineral oil, e.g. a white mineral oil with a dynamic viscosity of 15 - 80 mPa.s. at about 25 deg C, and can be applied by spraying, atomisation or coating at a preferable rate of 0.2 and 0.5 per cent by weight in relation to the paper. The motifs formed by the roller relifs are preferably between 30 and 40 sq mm in area each.

Description

La présente invention concerne le domaine des papiers à usage sanitaire ou domestique. On vise par exemple le papier hygiénique, les essuie-mains ou tout papier d'essuyage, les serviettes de table, etc.The present invention relates to the field of papers for sanitary purposes or domesticated. Examples include toilet paper, hand towels or any wiping paper, napkins, etc.

Pour la réalisation de tels produits, on utilise généralement l'ouate de cellulose appelée également papier tissue. Il s'agit d'un papier absorbant de faible grammage, compris entre 10 et 45 g/m2, obtenu par voie humide à partir de fibres papetières. Il comprend, éventuellement, des additifs chimiques dans de faibles proportions, selon l'usage auquel il est destiné. Il peut être obtenu par pressage de la feuille encore humide sur un cylindre chauffé de grand diamètre, sur lequel elle est séchée et dont elle est détachée ensuite au moyen d'une lame métallique appliquée contre celui-ci, transversalement à son sens de rotation. Cette opération a pour but de crêper la feuille qui présente alors des ondulations transversales à son sens marche. Le crêpage confère une certaine élasticité à la feuille en même temps qu'il en augmente l'épaisseur et lui procure des propriétés tactiles. Un autre mode de fabrication connu comprend une première étape de séchage de la feuille, au moins en partie, au moyen d'un courant d'air chaud la traversant. Celle-ci peut ensuite être crêpée ou non.For the production of such products, cellulose wadding, also known as tissue paper, is generally used. It is a low weight absorbent paper, between 10 and 45 g / m 2 , obtained wet from paper fibers. It includes, possibly, chemical additives in small proportions, according to the use for which it is intended. It can be obtained by pressing the still wet sheet on a heated cylinder of large diameter, on which it is dried and from which it is then detached by means of a metal blade applied against it, transversely to its direction of rotation. This operation is intended to crepe the sheet which then has transverse corrugations to its direction walk. The crepe gives the sheet a certain elasticity at the same time as it increases its thickness and gives it tactile properties. Another known method of manufacture comprises a first step of drying the sheet, at least in part, by means of a stream of hot air therethrough. This can then be creped or not.

L'invention a pour objet un procédé de marquage d'une feuille constituée d'un ou plusieurs plis d'ouate de cellulose pour obtenir un motif simulant un filigrane.The subject of the invention is a method of marking a sheet consisting of a or several plies of cellulose wadding to obtain a pattern simulating a watermark.

Le terme marquage désigne la compression de certaines parties d'un côté de la feuille pour former ainsi des zones compactées, et réduire significativement son épaisseur dans ces zones, sans formation d'un relief correspondant du côté opposé de la feuille.The term marking refers to the compression of certain parts on one side of the sheet to form compacted areas and significantly reduce its thickness in these areas, without formation of a corresponding relief on the opposite side of leaf.

Un filigrane est l'impression d'un dessin dans l'épaisseur ou corps du papier, qui est visible par transparence. Le filigrane est appelé filigrane « humide » ou « véritable » quand il est produit durant la fabrication du papier, dans la phase humide du procédé avant son séchage. Il est produit, par exemple, par l'empreinte d'un motif ménagé sur un cylindre tournant au contact de la feuille encore humide.A watermark is the impression of a drawing in the thickness or body of the paper, which is visible by transparency. The watermark is called a "wet" watermark or "True" when it is produced during paper making, in the wet phase of the process before drying. It is produced, for example, by the imprint of a motif arranged on a rotating cylinder in contact with the still wet sheet.

Un filigrane sec ou simulé est une impression d'apparence similaire à un filigrane véritable, produite sur le papier après sa fabrication. On en a déjà proposé divers modes de réalisation, mais convenant généralement à des applications différentes des papiers à usage sanitaire ou domestique.A dry or simulated watermark is an impression of appearance similar to a true watermark, produced on paper after its manufacture. We have already proposed various embodiments, but generally suitable for applications different from sanitary or domestic papers.

La Demanderesse, dans son brevet EP-B-0 864 014, a proposé l'application d'un motif simulant un filigrane à une feuille de papier absorbant en ouate de cellulose. Le procédé consiste à déformer la feuille sous contrainte par passage entre un rouleau gravé dur et un rouleau récepteur ayant une dureté de surface supérieure à 40 Shore D sous une pression spécifique d'au moins 150kg/cm2 avec une vitesse de marquage d'au moins 50m/min. De préférence, le cylindre gravé est en acier et chauffé à une température allant de 50°C à 100°C. Un apport d'eau en faible quantité est éventuellement prévu.The applicant, in its patent EP-B-0 864 014, proposed the application of a motive pattern simulating a watermark to a sheet of absorbent paper made of cellulose wadding. The method consists in deforming the sheet under stress by passing between a hard etched roll and a receiving roll having a surface hardness greater than 40 Shore D under a specific pressure of at least 150 kg / cm 2 with a marking speed of less 50m / min. Preferably, the engraved cylinder is made of steel and heated to a temperature of from 50 ° C to 100 ° C. Small quantities of water may be added.

Le procédé permet d'obtenir un produit avec un motif simulant un filigrane, la surface marquée étant lisse, brillante et translucide avec une faible épaisseur par rapport à son étendue.The method makes it possible to obtain a product with a pattern simulating a watermark, the marked surface being smooth, shiny and translucent with a thin relative to its extent.

La demanderesse a cherché à améliorer ce procédé, et en particulier à obtenir un motif en filigrane fortement contrasté sans avoir à mettre en oeuvre des moyens de chauffage.The applicant has sought to improve this process, and in particular to obtain a strongly contrasting filigree pattern without having to use means of heater.

Le procédé de l'invention parvient à cet objectif. The method of the invention achieves this objective.

Le procédé de l'invention pour marquer un motif simulant un filigrane sur une feuille composée d'au moins un pli d'ouate de cellulose, consistant à déformer sous contrainte la feuille entre un premier rouleau rigide à surface lisse et au moins un second rouleau rigide pourvu d'éléments en relief, est caractérisé par le fait que l'on applique à froid une pellicule d'un additif, favorisant la formation du filigrane, sur au moins l'une des surfaces de la feuille lors de l'opération de marquage..The method of the invention for marking a pattern simulating a watermark on a sheet composed of at least one ply of cellulose wadding, consisting of deforming constrains the sheet between a first smooth surface rigid roll and at least one second rigid roller provided with elements in relief, is characterized by the fact that cold apply a film of an additive, favoring the formation of the watermark, on to least one of the surfaces of the sheet during the marking operation.

Préférentiellement, l'additif est à base d'huile minérale. L'additif est appliqué en surface et pénètre dans l'épaisseur de la feuille en même temps qu'elle est déformée. Il est appliqué à froid, c'est à dire sans apport de chaleur extérieure, à température ambiante. On obtient ainsi un résultat optimum avec des moyens simples.Preferably, the additive is based on mineral oil. The additive is applied on the surface and penetrates into the thickness of the leaf at the same time that it is distorted. It is applied cold, that is to say without external heat input, to ambient temperature. This gives an optimum result with simple means.

De préférence, on applique l'additif sur le premier rouleau, sur les éléments en relief du second rouleau ou bien sur les deux rouleaux. Dans ce dernier cas, on constate que le décor ressort parfaitement, aussi bien sur la face marquée que sur la face opposée.Preferably, the additive is applied to the first roll, to the elements relief of the second roll or on both rolls. In the latter case, notes that the decoration is perfectly clear, both on the marked side and on the opposite side.

Différents moyens d'application de l'additif sont envisageables : enduction, pulvérisation, atomisation notamment. Dans le cas d'une pulvérisation, l'additif peut être appliqué directement sur le ou les rouleaux lors de l'opération de marquage. Cependant selon un mode de réalisation avantageux, on applique l'additif par enduction. L'enduction peut être effectuée au moyen d'un dispositif comprenant un cylindre tramé. Dans la description qui suit, on applique l'additif par contact de la surface à enduire, ici le ou les rouleaux, avec un moyen absorbant imprégné de l'additif. L'additif est ensuite transféré de la surface du ou des rouleaux sur la ou les surfaces de la feuille, lors de l'opération de marquage.Different means of application of the additive can be envisaged: coating, spraying, atomization in particular. In the case of spraying, the additive may be applied directly on the roll or rollers during the marking operation. However, according to an advantageous embodiment, the additive is applied by coating. The coating can be carried out by means of a device comprising a screen cylinder. In the description which follows, the additive is applied by contact with the surface to be coated, here the roll or rolls, with an absorbent means impregnated with the additive. The additive is then transferred from the surface of the roll or rolls onto the surfaces of the sheet, during the marking operation.

Il suffit d'appliquer une quantité d'additif assez faible, de telle sorte que le produit fini contienne moins de 1% en masse, de préférence entre 0,2 et 1 % et préférentiellement encore entre 0,2 et 0,5% d'additif en masse par rapport à la masse de la feuille.It suffices to apply a rather small quantity of additive, so that the finished product contains less than 1% by weight, preferably between 0.2 and 1% and preferentially still between 0.2 and 0.5% of additive in mass relative to the mass of the leaf.

De préférence, l'additif est une huile minérale blanche, convenant aux applications médicinales ou alimentaires. Sa viscosité dynamique à température ambiante, de l'ordre de 25°C, est comprise entre 15 et 80, de préférence entre 20 et 30 mPa.s, selon la norme NFT60-100.Preferably, the additive is a white mineral oil, suitable for medicinal or food applications. Its dynamic viscosity at temperature ambient temperature, of the order of 25 ° C, is between 15 and 80, preferably between 20 and 30 mPa.s, according to the NFT60-100 standard.

Ce procédé permet de créer des motifs aux formes variées. En particulier, les éléments en relief sur le second rouleau forment des motifs unitaires de surface comprise entre 20 et 50 mm2 et de préférence comprise entre 30 et 40mm2. Notamment, les éléments en relief comprennent des portions de forme continue, de préférence linéaire. Préférentiellement, le ratio de la surface marquée à la surface totale de la feuille est inférieur à 20%.This process makes it possible to create patterns with various shapes. In particular, the elements in relief on the second roll form units unitary surface area of between 20 and 50 mm 2 and preferably between 30 and 40 mm 2 . In particular, the raised elements comprise portions of continuous shape, preferably linear. Preferably, the ratio of the marked area to the total area of the sheet is less than 20%.

Par ailleurs, on exerce une force sur le second rouleau correspondant à une pression linéaire sur la feuille comprise entre environ 20 et environ 100 kg/cml, de préférence entre 40 et 90 kg/cml.On the other hand, a force is exerted on the second roller corresponding to a linear pressure on the sheet of between about 20 and about 100 kg / cm 2, preferably between 40 and 90 kg / cml.

Conformément à un mode de réalisation avantageux, pour le marquage d'une feuille de laize comprise notamment entre 250 et 3200 mm, on déforme la feuille entre un premier rouleau s'étendant sur la largeur de la laize de la feuille et au moins un second rouleau de largeur comprise entre 15 et 90 mm.According to an advantageous embodiment, for the marking of a sheet of width included between 250 and 3200 mm, the sheet is deformed between a first roll extending across the width of the width of the sheet and at least a second roll of width between 15 and 90 mm.

En particulier, on dispose une pluralité de seconds rouleaux répartis sur la longueur du premier rouleau. Chaque rouleau peut être formé d'un assemblage de plusieurs disques.In particular, a plurality of second rollers distributed over the length of the first roll. Each roll can be formed of an assembly of several discs.

La feuille obtenue comprenant au moins un pli d'ouate de cellulose de grammage compris entre 10 et 45 g/m2, présentant une zone marquée simulant un filigrane, est caractérisée par le fait qu'elle est imprégnée d'additif, notamment d'huile minérale. Avantageusement, la quantité d'additif est inférieure à 1 % en masse par rapport à la masse de la feuille.The sheet obtained comprising at least one ply of cellulose wadding weighing between 10 and 45 g / m 2 , having a marked zone simulating a watermark, is characterized in that it is impregnated with additive, in particular with mineral oil. Advantageously, the amount of additive is less than 1% by weight relative to the mass of the sheet.

L'invention sera mieux comprise à la lecture de la description qui va suivre, faite à titre illustratif et nullement limitatif, en référence aux dessins annexés sur lesquels :

  • La figure 1 est une vue en perspective schématique d'un mode de réalisation de l'invention,
  • La figure 2 est une coupe d'une feuille réalisée selon l'invention,
  • La figure 3 est une illustration d'un décor sur une feuille selon l'invention.
The invention will be better understood on reading the following description, given by way of illustration and in no way limiting, with reference to the appended drawings in which:
  • FIG. 1 is a schematic perspective view of an embodiment of the invention,
  • FIG. 2 is a section of a sheet made according to the invention,
  • Figure 3 is an illustration of a decor on a sheet according to the invention.

Comme on le voit sur la figure 1, une feuille 8 composée d'au moins un pli d'ouate de cellulose, ici deux, est dévidée depuis au moins une bobine. Elle est guidée, via au moins un rouleau de détour ou de guidage (non référencé) jusqu'à passer entre un premier rouleau 1 dont la surface est lisse et une pluralité de deuxièmes rouleaux 2 pourvus d'éléments en relief. Le premier rouleau présente un axe de rotation YY'. Les rouleaux 2 sont gravés et sont par exemple montés sur un axe commun XX', qui est parallèle à YY'. Il entre également dans le cadre de l'invention de disposer les deuxièmes rouleaux 2 sur deux ou plusieurs axes parallèles. Ils peuvent ainsi être disposés le long de deux axes diamétralement opposés, avec l'avantage d'assurer un meilleur équilibrage des efforts exercés sur le premier rouleau 1. Les deuxièmes rouleaux 2 peuvent avoir chacun une largeur comprise entre 15 et 90 mm, par exemple 80 mm. Ils peuvent être espacés les uns des autres pour former des bandes décorées sur la feuille à traiter.As seen in FIG. 1, a sheet 8 composed of at least one fold cellulose wadding, here two, is unwound from at least one coil. She is guided, via at least one detour or guide roll (not referenced) up to pass between a first roll 1 whose surface is smooth and a plurality of second rollers 2 provided with relief elements. The first roll presents a rotation axis YY '. The rollers 2 are etched and are for example mounted on a common axis XX ', which is parallel to YY'. It is also part of the the invention to have the second rollers 2 on two or more axes parallel. They can thus be arranged along two axes diametrically opposed, with the advantage of ensuring a better balancing of efforts exerted on the first roll 1. The second rollers 2 may each have a width between 15 and 90 mm, for example 80 mm. They can be spaced apart others to form decorated strips on the sheet to be treated.

Les éléments en relief sur les roues gravées 2 sont de forme complexe, continue ou formés d'ensembles continus (ouverts ou fermés). Sans sortir du cadre de l'invention, il est possible de caler les molettes 2 de façon à obtenir un motif qui s'étend sur tout ou partie de la surface de la feuille. Entre les rouleaux 1 et 2, il y a compression de la feuille 8. On a prévu des moyens permettant d'exercer une force sur les deuxièmes rouleaux correspondant à une pression linéaire comprise entre environ 20 et 100 kg/cml, de préférence entre 40 et 90 kg/cml.The elements in relief on the engraved wheels 2 are of complex shape, continuous or formed of continuous assemblies (open or closed). Without leaving the framework of the invention, it is possible to wedge the knurls 2 so as to obtain a pattern which extends over all or part of the surface of the sheet. Between rolls 1 and 2, there is compression of the sheet 8. Means for exerting force on the second rolls corresponding to a linear pressure between about 20 and 100 kg / cm 2, preferably between 40 and 90 kg / cm 2.

Par ailleurs, à ce niveau, la feuille 8 est recouverte sur l'une au moins de ses surfaces d'un additif à base d'huile minérale, telle que la vaseline. Selon un mode de réalisation préféré, on utilise une huile blanche minérale, médicinale ou alimentaire, de toute façon adaptée aux utilisations en contact alimentaire direct, indirect ou occasionnel. Par exemple, on utilise une huile commercialisée sous la marque Primol ou Marcol par la société ESSO SAF . Il s'agit d'un liquide incolore dont la viscosité dynamique à 25°C est avantageusement comprise entre 20 et 25 mPa.s.Moreover, at this level, the sheet 8 is covered on at least one of its surfaces of an additive based on mineral oil, such as petroleum jelly. According to a mode of preferred embodiment, using a white mineral oil, medicinal or food, in any case suitable for use in direct, indirect or indirect food contact occasional. For example, an oil marketed under the trade name Primol is used. or Marcol by ESSO SAF. It is a colorless liquid whose viscosity dynamic at 25 ° C is advantageously between 20 and 25 mPa.s.

Des moyens 3 et 4 destinés à l'application de l'additif sont prévus. Ces moyens peuvent enduire soit les rouleaux gravés 2, soit le rouleau lisse 1, soit les deux types de rouleaux. Selon le cas, ils sont en contact avec l'un et/ou l'autre desdits rouleaux.Means 3 and 4 for applying the additive are provided. These means may coat either the engraved rollers 2, the smooth roll 1, or the two types of rollers. Depending on the case, they are in contact with one and / or the other of said rolls.

Les moyens 3 et 4 peuvent être de tout type connu en soi, avec une réserve 5 pour l'additif et une matière absorbante qui permet de transférer l'additif depuis la réserve 5 jusque sur le rouleau associé 1 ou 2. La matière absorbante peut être à base de fibres textiles avec une densité comprise entre 200 et 450 g/m2/mm, par exemple 225 g/m2/mm.The means 3 and 4 may be of any type known per se, with a reserve 5 for the additive and an absorbent material which makes it possible to transfer the additive from the reserve 5 to the associated roller 1 or 2. The absorbent material may be based on textile fibers with a density of between 200 and 450 g / m 2 / mm, for example 225 g / m 2 / mm.

Concernant le rouleau lisse 1, l'additif est préférentiellement appliqué sur toute sa surface de contact et orienté selon la génératrice.With regard to the smooth roll 1, the additive is preferentially applied to its entire contact surface and oriented along the generator.

Pour les rouleaux gravés 2, en utilisant le moyen d'enduction ci-dessus, les sommets des motifs en relief sont enduits d'additif. Le procédé de l'invention est particulièrement avantageux dans des installations qui marquent un temps d'arrêt après le bobinage d'un log ou de rouleaux, connues dans le domaine sous le nom de « stop & go ».For the engraved rolls 2, using the coating means above, the vertices of the relief patterns are coated with additive. The process of the invention is particularly advantageous in installations which mark downtime after winding a log or rolls, known in the art as "Stop & go".

Lorsque les deux surfaces d'une feuille 8 sont totalement ou partiellement imprégnées d'additif, on peut obtenir par exemple un produit tel que schématisé en coupe sur la figure 2 avec deux couches 6 et 7 d'additif. De façon avantageuse, cette double application d'additif permet de renforcer le contraste visuel des motifs marqués. Les aspects visuels et l'esthétique sont renforcés par l'action mécanique de compression du deuxième moyen 2 contre la feuille à traiter qui, lors de cette étape, est imprégnée de l'additif à base d'huile minérale, et est en appui sur le premier moyen (rouleau 1 lisse).When the two surfaces of a sheet 8 are totally or partially impregnated with an additive, it is possible to obtain, for example, a product as schematized in section in Figure 2 with two layers 6 and 7 of additive. Advantageously, this double application of additive helps to reinforce the visual contrast of the patterns marked. Visual aspects and aesthetics are reinforced by the mechanical action of compressing the second means 2 against the sheet to be treated which, during this step, is impregnated with the additive based on mineral oil, and bears on the first medium (roll 1 smooth).

Par ailleurs, de façon nouvelle et inattendue, l'effet de contraste visuel est réellement accentué lorsque la quantité d'additif déposé et mesurable sur la feuille, est inférieure à 1 % en masse par rapport à la masse totale de la feuille.On the other hand, in a new and unexpected way, the visual contrast effect is really accentuated when the quantity of additive deposited and measurable on the sheet, is less than 1% by weight relative to the total mass of the sheet.

Cette quantité permet non seulement d'avoir un effet de contraste visuel renforcé mais également de ne pas créer de traces ou taches autour des limites du motif. On obtient un produit dont le motif est d'excellente qualité.This quantity not only allows to have a visual contrast effect reinforced but also not to create traces or spots around the boundaries of the pattern. We obtain a product whose pattern is of excellent quality.

A titre d'illustration, la pression d'application du moyen 2 contre le moyen 1 est d'au moins 60 kg/cml (kg par cm linéaire mesuré le long de la génératrice de contact).By way of illustration, the application pressure of the means 2 against the means 1 is at least 60 kg / cml (kg per linear cm measured along the generator of contact).

De manière avantageuse, les éléments en relief sur les rouleaux 2 présentent des surfaces de l'ordre de 20 à 50 mm2, et préférentiellement de 30 à 40 mm2. Ils sont disposés sur le second rouleau 2 de façon que celui-ci reste en appui continu sur le rouleau lisse 1 de manière à éviter les vibrations.Advantageously, the elements in relief on the rollers 2 have surfaces of the order of 20 to 50 mm 2 , and preferably 30 to 40 mm 2 . They are arranged on the second roller 2 so that it remains in continuous support on the smooth roller 1 so as to avoid vibrations.

Les motifs sont de toute forme, linéaire ou non ; un exemple est donné sur la figure 3 où des motifs 9 de type plume apparaissent en sombre sur un fond clair. En fait, sur une feuille en ouate de cellulose, les motifs forment un contraste vis à vis du fond de la feuille 8.The patterns are of any shape, linear or not; an example is given on the Figure 3 where 9 feather patterns appear in dark on a light background. In made on a sheet of cellulose wadding, the patterns form a contrast with the bottom of the sheet 8.

La feuille 8 peut être formée d'un ou de plusieurs plis. Dans ce dernier cas, on constate une association des plis entre eux dans les zones comportant le décor. Des feuilles de grande largeur peuvent être décorées par le procédé selon l'invention. Un exemple de décor est donné sur la figure 3.The sheet 8 may be formed of one or more plies. In the latter case, notes an association of the folds between them in the zones containing the decor. of the wide sheets can be decorated by the method according to the invention. A example of decor is given in Figure 3.

Une mise en oeuvre appropriée de l'invention consiste alors à prévoir au moins un premier ensemble de moyens gravés 2 disposés selon un premier axe XX', ainsi qu'un deuxième ensemble de moyens gravés disposés selon un deuxième axe différent et parallèle au premier (XX'), les axes étant parallèles à l'axe YY' du rouleau lisse 1. Les premier et deuxième axes des deuxièmes moyens gravés peuvent par exemple être disposés diamétralement opposés vis à vis du rouleau lisse 1. Sur chacun des premiers axes (XX'), les moyens gravés tels que des roues moletées, sont placées à une certaine distance les unes des autres. Ainsi, en cas de dommages ou d'usure, le remplacement d'une roue est aisé. S'ils sont disposés selon deux axes, les rouleaux gravés 2 sont préférentiellement placés en quinconce.An appropriate implementation of the invention then consists in providing at least a first set of etched means 2 arranged along a first axis XX ', and that a second set of engraved means arranged along a second axis different and parallel to the first (XX '), the axes being parallel to the axis YY' of the smooth roll 1. The first and second axes of the second engraved means can for example, to be arranged diametrically opposed with respect to the smooth roll. each of the first axes (XX '), the engraved means such as knurled wheels, are placed at a certain distance from each other. So, in case of damage or wear, the replacement of a wheel is easy. If they are arranged along two axes, the engraved rollers 2 are preferably placed in staggered rows.

Les produits visés par l'invention sont par exemple des rouleaux de papier hygiénique, des serviettes de table, des essuie-mains ou encore des rouleaux pour l'essuyage industriel. Dans le cas de produits tels que des essuie-mains ou serviettes de table, un décor localisé par exemple en bordure de produit peut être prévu.The products covered by the invention are, for example, rolls of paper hygienic, napkins, towels or rolls for industrial wiping. In the case of products such as towels or towels table, a localized decoration for example at the edge of the product can be provided.

Un décor réparti sur toute la surface du produit peut en revanche être prévu pour des applications de type papier hygiénique ou essuyage industriel.A decoration distributed over the entire surface of the product may, however, be provided for hygienic paper or industrial wiping applications.

On a procédé à des essais d'application d'un additif, huile Marcol 82, sur une installation telle que représentée sur la figure 1 avec enduction sur les rouleaux 1 et 2. La pression de marquage était de 60 kg/cml. La vitesse de défilement de la feuille était de 100 m/min.Application tests of an additive, Marcol 82 oil, were carried out on a installation as shown in Figure 1 with coating on the rollers 1 and 2. The marking pressure was 60 kg / cml. The scroll speed of the sheet was 100 m / min.

On a procédé à une analyse d'image du papier dans les zones marquées et les zones non marquées. On peut ainsi évaluer le contraste et la visibilité du filigrane en déterminant la différence entre les niveaux de gris mesurés. Cette méthode est reprise du brevet EP 0864014 B1 de la Demanderesse. Des résultats sont rapportés dans le tableau ci-dessous.Paper image analysis was carried out in the marked areas and the unmarked areas. It is thus possible to evaluate the contrast and the visibility of the watermark in determining the difference between the gray levels measured. This method is repeated patent EP 0864014 B1 of the Applicant. Results are reported in the table below.

Enfin, on a mesuré la quantité d'additif imprégné sur la feuille, c'est à dire les pourcentages en masse d'additif présent dans la feuille ainsi obtenue par le dispositif décrit. La mesure a consisté à extraire au chloroforme l'additif par la technique de gravimétrie. On rappelle cette méthode ci-après.Finally, the quantity of additive impregnated on the sheet, that is to say the percentages by mass of additive present in the sheet thus obtained by the device described. The measure consisted in extracting the additive by chloroform gravimetrically. This method is recalled below.

On réalise un échantillon témoin avec additif et un échantillon sans additif. On prélève 4 g de papier que l'on introduit dans une cartouche d'extraction. On extrait l'additif par solvant au moyen de 50 ml de chloroforme dans un appareil « Soxlhet » automatique. Après une étape de trempage d'une demi-heure et un rinçage d'une heure, l'évaporation du solvant a lieu, et on quantifie le taux d'extrait. Le taux d'additif correspond au taux d'extrait de l'échantillon avec additif diminué du taux d'extrait de l'échantillon sans additif. Les quantités ainsi mesurées d'additif sont indiquées en % dans le tableau ci-dessous.A control sample with additive and a sample without additive are made. We take 4 g of paper which is introduced into an extraction cartridge. We extract the additive by solvent with 50 ml of chloroform in a "Soxlhet" apparatus automatic. After a soaking step of half an hour and a rinse of a hour, the evaporation of the solvent takes place, and the rate of extract is quantified. The rate of additive corresponds to the rate of extract of the sample with additive reduced by Sample extract without additive. The quantities thus measured of additive are indicated in% in the table below.

L'épaisseur d'une feuille est déterminée selon la norme ENV 12625-3 et elle n'est pas augmentée par le procédé selon l'invention. L'épaisseur de la feuille de base, non marquée est d'environ 0,224 mm. Pression linéaire Kg/cml Vitesse de la feuille m/min Epaisseur de la feuille mm Différences des niveaux de gris Additif % face(6) face(7) 43,75 100 0,226+- 0,01 34 36 0,37 65,62 100 0,237+- 0,01 56 54 0,45 87,5 100 0,239+- 0,01 60 54 0,35 The thickness of a sheet is determined according to ENV 12625-3 and is not increased by the process according to the invention. The thickness of the unlabelled base sheet is about 0.224 mm. Linear pressure Kg / cml Sheet speed m / min Thickness of the sheet mm Differences in gray levels Additive% face (6) face (7) 43.75 100 0.226 + - 0.01 34 36 0.37 65.62 100 0.237 + - 0.01 56 54 0.45 87.5 100 0.239 + - 0.01 60 54 0.35

Les différences de niveaux de gris mesurées sur chacune des faces illustrent la bonne visibilité du motif simulant un filigrane. On observe, en outre, la formation d'un filigrane aussi bien sur la face venant au contact du rouleau lisse que des rouleaux gravés.The differences in gray levels measured on each of the faces illustrate the good visibility of the pattern simulating a watermark. In addition, training of a watermark both on the face coming into contact with the smooth roller and the engraved rolls.

La méthode décrite dans le brevet EP864014 consiste à éclairer la feuille au moyen d'une fibre optique et d'un diffuseur de lumière, et à mesurer le niveau de gris au moyen d'une caméra CCD et d'un analyseur d'image Quantilet 600S Leica. On ajuste les paramètres tels que la luminosité et le contraste. On délimite une surface pour obtenir une image. L'image est divisée en pixels. Chaque pixel de cette surface a un niveau de gris. La valeur moyenne de tous les pixels de l'image donne une valeur moyenne de niveau de gris de la surface. Dans l'échelle de gris, le blanc a un niveau 256 et le noir 0. On mesure la moyenne de niveau de gris d'une surface marquée en délimitant une petite zone fermée. On délimite une zone non marquée de surface correspondante près de cette zone marquée et on en mesure la moyenne de niveau de gris. On calcule la différence entre les moyennes des deux images que l'on reporte dans le tableau. De façon courante, un filigrane est obtenu dès lors que la valeur de la différence des niveaux de gris est supérieure à 20.The method described in patent EP 864014 consists in illuminating the sheet means of an optical fiber and a light diffuser, and to measure the level of gray using a CCD camera and a Leica Quantilet 600S image analyzer. We adjusts settings such as brightness and contrast. We delimit a surface to get an image. The image is divided into pixels. Each pixel of this surface has a gray level. The average value of all pixels in the image gives a value average gray level of the surface. In the gray scale, the white has a level 256 and black 0. The average gray level of a marked surface is measured in delimiting a small closed area. We delimit an unmarked area of surface corresponding to this marked area and measure the average level of Grey. We calculate the difference between the averages of the two images that we postpone In the picture. In common, a watermark is obtained when the value of the difference in gray levels is greater than 20.

Claims (18)

Procédé pour marquer un motif simulant un filigrane sur une feuille (8) composée d'au moins un pli d'ouate de cellulose, consistant à déformer sous contrainte la feuille entre un premier rouleau (1) rigide à surface lisse et au moins un second rouleau (2) rigide pourvu d'éléments en relief, caractérisé par le fait que l'on applique à froid une pellicule d'additif, favorisant la formation du filigrane, sur au moins l'une des surfaces de la feuille lors de l'opération de marquage.A method of marking a pattern simulating a watermark on a sheet (8) of at least one ply of cellulose wadding, comprising stress-deforming the sheet between a first smooth surface rigid roll (1) and at least one second rigid roller (2) provided with elements in relief, characterized in that a film of additive, favoring the formation of the watermark, is applied to at least one of the surfaces of the sheet during cold weathering. marking operation. Procédé selon la revendication 1, dans lequel l'additif est à base d'huile minérale.Process according to claim 1, wherein the additive is oil-based mineral. Procédé selon la revendication 1, dans lequel on applique l'additif sur le premier rouleau (1).A process according to claim 1, wherein the additive is applied to the first roll (1). Procédé selon l'une quelconque des revendications précédentes, dans lequel on applique l'additif sur les éléments en relief du deuxième rouleau (2).The method of any one of the preceding claims, wherein the additive is applied to the raised elements of the second roll (2). Procédé selon la revendication 1, dans lequel on applique l'additif sur les deux rouleaux (1 et 2).The process according to claim 1, wherein the additive is applied to both rolls (1 and 2). Procédé selon l'une quelconque des revendications précédentes, dans lequel on applique l'additif par pulvérisation ou atomisation ou enduction et de préférence par contact avec un moyen absorbant imprégné du dit additif.The method of any one of the preceding claims, wherein the additive is applied by spraying or atomizing or coating and preferably by contact with an absorbent means impregnated with said additive. Procédé selon l'une des revendications précédentes, dans lequel on applique moins de 1 %, de préférence entre 0,2 et 1 % d'additif en masse par rapport à la feuille, et plus particulièrement entre 0,2 et 0,5 % en masse par rapport à la masse de la feuille.Method according to one of the preceding claims, in which one applies less than 1%, preferably between 0.2 and 1% of additive by weight relative to the sheet, and more particularly between 0.2 and 0.5% by weight with respect to the mass of the leaf. Procédé selon l'une des revendications précédentes, dans lequel l'additif est une huile blanche minérale de viscosité dynamique à environ 25°C comprise entre 15 et 80 mPa.s, et de préférence comprise entre 20 et 30 mPa.s.Process according to one of the preceding claims, in which the additive is a mineral white oil with a dynamic viscosity at around 25 ° C included between 15 and 80 mPa.s, and preferably between 20 and 30 mPa.s. Procédé selon l'une des revendications précédentes, dans lequel les éléments en relief sur le second rouleau forment des motifs unitaires de surface comprise entre 20 et 50 mm2, de préférence comprise entre 30 et 40 mm2.Method according to one of the preceding claims, wherein the raised elements on the second roll form unitary units of surface area between 20 and 50 mm 2 , preferably between 30 and 40 mm 2 . Procédé selon la revendication précédente, dans lequel les éléments en relief comprennent des portions de forme continue.Method according to the preceding claim, in which the elements in relief include continuously shaped portions. Procédé selon l'une des revendications précédentes, dans lequel on exerce une force sur le second rouleau (2) correspondant à une pression linéaire comprise entre environ 20 et 100 kg/cml, et de préférence entre 40 et 90 kg/cml.Method according to one of the preceding claims, in which one exercises a force on the second roller (2) corresponding to a linear pressure included between about 20 and 100 kg / cm 2, and preferably between 40 and 90 kg / cm 2. Procédé selon l'une des revendications précédentes pour le marquage d'une feuille de laize comprise entre 250 et 3200 mm, selon lequel on déforme la feuille entre un premier rouleau s'étendant sur la largeur de la laize de la feuille et au moins un deuxième rouleau de largeur comprise entre 15 et 90 mm.Method according to one of the preceding claims for the marking of a sheet of width between 250 and 3200 mm, according to which the sheet between a first roll extending over the width of the width of the sheet and at least one second roll of width between 15 and 90 mm. Procédé selon la revendication précédente, dans lequel on déforme la feuille entre un premier rouleau et une pluralité de seconds rouleaux répartis sur la longueur du premier rouleau.Method according to the preceding claim, in which the sheet is deformed between a first roll and a plurality of second rolls distributed over the length of the first roll. Feuille comprenant au moins un pli d'ouate de cellulose de grammage compris entre 10 et 45 g/m2, obtenue par le procédé selon l'une des revendications précédentes, présentant une zone marquée simulant un filigrane, caractérisée par le fait qu'elle est imprégnée d'additifSheet comprising at least one ply of cellulose wadding of grammage between 10 and 45 g / m 2 , obtained by the method according to one of the preceding claims, having a marked zone simulating a watermark, characterized in that it is impregnated with additive Feuille selon la revendication précédente, dans laquelle l'additif est à base d'huile minérale. Sheet according to the preceding claim, in which the additive is based mineral oil. Feuille selon l'une des revendications 14 et 15, dans laquelle l'additif est présent au niveau des surfaces marquées.Sheet according to one of Claims 14 and 15, in which the additive is present at marked surfaces. Feuille selon l'une des revendications 14 à 16, dont la quantité d'additif à base d'huile minérale est inférieure à 1% en masse par rapport à la masse totale de la feuille.Sheet according to one of claims 14 to 16, the amount of additive based mineral oil is less than 1% by mass in relation to the total mass of leaf. Feuille selon l'une quelconque des revendications 14 à 17, dont le pourcentage de la surface marquée à la surface totale de la feuille est inférieur à 20%.Sheet according to any one of Claims 14 to 17, the percentage of the area marked on the total surface of the leaf is less at 20%.
EP02010746A 2002-05-14 2002-05-14 Process for marking a paperweb, paperweb having a watermark pattern Expired - Lifetime EP1362953B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DK02010746T DK1362953T3 (en) 2002-05-14 2002-05-14 Method of marking a sheet of paper, sheet with a pattern of the watermark type
PT02010746T PT1362953E (en) 2002-05-14 2002-05-14 PROCESS OF MARKING OF A SHEET OF PAPER SHEET CONTAINING A REASON OF THE FILIGRAN TYPE
AT02010746T ATE295448T1 (en) 2002-05-14 2002-05-14 METHOD FOR MARKING A PAPER SHEET, PAPER SHEET WITH A WATERMARK PATTERN
ES02010746T ES2241925T3 (en) 2002-05-14 2002-05-14 MARKET PROCEDURE OF A PAPER SHEET THAT HAS A FILIGRAN TYPE REASON.
EP02010746A EP1362953B1 (en) 2002-05-14 2002-05-14 Process for marking a paperweb, paperweb having a watermark pattern
DE60204120T DE60204120T2 (en) 2002-05-14 2002-05-14 Method of marking a paper web, paper web with a watermark pattern
US10/435,559 US6824647B2 (en) 2002-05-14 2003-05-12 Method for marking a sheet of paper and sheet with a watermark
CA2428583A CA2428583C (en) 2002-05-14 2003-05-13 Procedure for imprinting a filigree pattern on sheet of paper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02010746A EP1362953B1 (en) 2002-05-14 2002-05-14 Process for marking a paperweb, paperweb having a watermark pattern

Publications (2)

Publication Number Publication Date
EP1362953A1 true EP1362953A1 (en) 2003-11-19
EP1362953B1 EP1362953B1 (en) 2005-05-11

Family

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EP02010746A Expired - Lifetime EP1362953B1 (en) 2002-05-14 2002-05-14 Process for marking a paperweb, paperweb having a watermark pattern

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Country Link
US (1) US6824647B2 (en)
EP (1) EP1362953B1 (en)
AT (1) ATE295448T1 (en)
CA (1) CA2428583C (en)
DE (1) DE60204120T2 (en)
DK (1) DK1362953T3 (en)
ES (1) ES2241925T3 (en)
PT (1) PT1362953E (en)

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US8323453B2 (en) 2006-09-27 2012-12-04 Georgia-Pacific France Method and installation for the combination of plies forming an absorbent sheet
CN104416955A (en) * 2013-08-30 2015-03-18 大王制纸株式会社 Manufacturing method of toilet paper, manufacturing method of toilet rolls and toilet roll

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US20070137814A1 (en) * 2005-12-15 2007-06-21 Kimberly-Clark Worldwide, Inc. Tissue sheet molded with elevated elements and methods of making the same
FR2906183B1 (en) 2006-09-27 2009-06-12 Georgia Pacific France Soc Par METHOD AND ASSEMBLY FOR MANUFACTURING AN ABSORBENT SHEET AND ABSORBENT SHEET OBTAINED
FR2929962B1 (en) * 2008-04-11 2021-06-25 Arjowiggins Licensing Sas METHOD OF MANUFACTURING A SHEET INCLUDING AN UNDERTHICKNESS OR AN EXCESS THICKNESS AT THE LEVEL OF A RIBBON AND ASSOCIATED SHEET.
DE102008024941A1 (en) 2008-05-23 2009-12-17 Anja Schulz Brewing bag, particularly tea bag, has bag which is made up of filter paper and contains filter material, where brewed substance is included in bag such that liquid comes in contact with substance during brewing
AU2017264499B2 (en) * 2016-05-09 2021-04-01 Kimberly-Clark Worldwide, Inc. Topically treated patterned tissue product
BR112018072620B1 (en) * 2016-05-09 2022-09-20 Kimberly-Clark Worldwide, Inc MANUFACTURING METHOD OF A STANDARDIZED TISSUE PAPER PRODUCT
WO2017196516A1 (en) * 2016-05-09 2017-11-16 Kimberly-Clark Worldwide, Inc. Patterned tissue product

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CN104416955A (en) * 2013-08-30 2015-03-18 大王制纸株式会社 Manufacturing method of toilet paper, manufacturing method of toilet rolls and toilet roll

Also Published As

Publication number Publication date
CA2428583C (en) 2013-04-09
DE60204120D1 (en) 2005-06-16
US6824647B2 (en) 2004-11-30
US20040007338A1 (en) 2004-01-15
DE60204120T2 (en) 2006-02-02
PT1362953E (en) 2005-09-30
CA2428583A1 (en) 2003-11-14
ES2241925T3 (en) 2005-11-01
ATE295448T1 (en) 2005-05-15
DK1362953T3 (en) 2005-08-29
EP1362953B1 (en) 2005-05-11

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