EP0564319B1 - New embossed multiply papers, apparatus and process for making the same - Google Patents

New embossed multiply papers, apparatus and process for making the same Download PDF

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Publication number
EP0564319B1
EP0564319B1 EP93400721A EP93400721A EP0564319B1 EP 0564319 B1 EP0564319 B1 EP 0564319B1 EP 93400721 A EP93400721 A EP 93400721A EP 93400721 A EP93400721 A EP 93400721A EP 0564319 B1 EP0564319 B1 EP 0564319B1
Authority
EP
European Patent Office
Prior art keywords
protuberances
sheet
ply
embossed
complex
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
EP93400721A
Other languages
German (de)
French (fr)
Other versions
EP0564319A1 (en
Inventor
Rémy Ruppel
Pierre Laurent
Joel Hungler
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.)
Kaysersberg SA
Original Assignee
Kaysersberg SA
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Publication date
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Publication of EP0564319A1 publication Critical patent/EP0564319A1/en
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Publication of EP0564319B1 publication Critical patent/EP0564319B1/en
Anticipated expiration legal-status Critical
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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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K10/00—Body-drying implements; Toilet paper; Holders therefor
    • A47K10/16—Paper towels; Toilet paper; Holders therefor
    • 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
    • B31F2201/0738—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
    • B31F2201/0758—Characteristics of the embossed product
    • B31F2201/0761—Multi-layered
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1007—Running or continuous length work
    • Y10T156/1023—Surface deformation only [e.g., embossing]
    • 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
    • Y10T428/24562—Interlaminar spaces
    • 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
    • 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.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24661—Forming, or cooperating to form cells
    • 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.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31975—Of cellulosic next to another carbohydrate
    • Y10T428/31978—Cellulosic next to another cellulosic
    • Y10T428/31982—Wood or paper

Definitions

  • the present invention relates to new multilayer papers, a device and a method for manufacturing them.
  • the invention relates more particularly to papers usable in the household and domestic field, in particular embossed papers based on crepe paper of the cellulose wadding type.
  • papers are particularly sought after having good absorption qualities associated with great softness and good mechanical resistance properties.
  • a first type consists in making two identical embossings on two separate plies of paper so as to produce protuberances on the sheets, to form a laminate from these two sheets, the protuberances of the two sheets being directed towards the internal part of the laminate and glued together by their ends.
  • This system achieves what will be called a "tip-tip" assembly.
  • Such a process, as well as the laminates obtained, is described in patent US-A-3,414,459.
  • Such a system essentially makes it possible to make two-layer papers with the structure shown in FIG. 6 of patent US-A-3 414 459.
  • Another variant described in this patent consists, as appears in FIG. 7, of inserting before gluing the tips an unembossed sheet between the two embossed sheets.
  • Another method described in particular in US Pat. No. 3,867,225 consists in also producing a laminate between two embossed sheets also placed so that the protuberances are directed towards the interior of the laminate, by gluing the ends of the protrusions one of the two sheets and making the bonding in a position such that the protrusions of one of the sheets come to fit between two protrusions of the other sheet.
  • US Pat. No. 4,320,162 has proposed a method for producing sheets of multilayer paper having two series of embossings of different depths and in which the bonding between the two sheets is carried out only between the most embossing deep.
  • the goal sought with the product obtained is an improvement in softness, water retention, bulk and aesthetics.
  • GB-A-1382714 describes a multilayer sheet consisting of two sheets, the embossed areas are arranged so that they intersect with each other thus limiting the surface of the bonded areas.
  • Patent EP-B-265298 describes a multi-layer sheet composed of at least two embossed sheets, the protuberances of which are arranged in lines or combinations of lines to produce wide patterns.
  • the present invention proposes a new structure of embossed paper making it possible to produce multilayer complexes combining qualities hitherto never combined. It also proposes a method and a device for producing these multilayer complexes.
  • the present invention provides a new multilayer sheet structure of embossed paper comprising a first sheet and a second sheet having protrusions of different depths produced during their embossing, characterized in that the first sheet comprises deeper protrusions known as large protrusions alternating with shallower protrusions called small protrusions and the second sheet includes protrusions, and in that the ends of the small protrusions of the first sheet and the protrusions of the second sheet are glued in point-to-point position and the ends of the large protrusions of the first sheet come to fit between two protrusions of the second sheet.
  • the sum of the heights of the small protrusions of the first sheet and the protrusions of the second sheet is at least equal to the height of the large protrusions of the first sheet. According to a particular embodiment, said sum is equal to the height of the large protuberances.
  • the small protrusions of the first sheet have the same height as the protrusions of the second sheet.
  • the invention relates to complexes further comprising a third sheet having protuberances whose pitch corresponds to that of the large protuberances of the first sheet and which are bonded in point-to-point position relative to the large protuberances of the first leaf.
  • the invention also relates to complexes formed from four sheets in which the first two have the configuration described above and further comprising a third sheet having an embossing identical to that of the second sheet and a fourth sheet comprising an embossing identical to that of the first sheet with protuberances and large protuberances, the small protuberances of the fourth sheet being located in point-to-point position relative to the protuberances of the third sheet and the large protuberances of the fourth sheet coming to fit between the protuberances the third sheet, the bonding between the sheets being provided at least at the level of the large protuberances of the first and fourth sheets.
  • the invention relates to a device making it possible to produce the various multilayer complexes of the present invention or the implementation of the method of the invention.
  • FIG. 1 represents a laminate obtained in a conventional process of the prior art of embossing and gluing in point-to-point position where two sheets a, b were embossed simultaneously and glued in point-to-point position with a third sheet c embossed according to the same pattern.
  • bonding is carried out at the points e, all located at the same level.
  • FIG. 2 represents a laminate composed of three embossed sheets and glued in the "nested" position according to the prior art.
  • two sheets a ', b' have been embossed simultaneously, the ends e ′ of the protuberances of these two sheets are stuck in an interposed position between the protuberances produced in a third sheet c ′.
  • the association points between the three sheets are all at the same level.
  • FIG. 3 represents a complex according to the invention composed of three embossed sheets 1, 2 and 3: the first sheet 1 has protuberances of two different depths, protuberances 12 of shallow depth alternating regularly with deeper protuberances 11.
  • a third layer constitutes the complex in FIG. 3: this layer has an embossing with a pitch not identical to that of layer 1 with regard to the protuberances 11 and the ends of the protuberances 33 are glued at e2 to the layer 2 in the point-to-point position relative to the ends of the protrusions 11 of sheet 1.
  • the height of the protrusions 11 be at most equal to the sum of the heights of the protrusions 12 and 22.
  • the folds 1 and 3 will be made of a particularly soft material
  • the fold 2 which, for its part, is not in contact with the outside may consist of a sheet which is less soft to the touch, therefore more resistant without that it affects the touch of the whole.
  • the product in FIG. 3 has an exterior surface similar to that of a point-to-point product (with the embossing point situated inwards), therefore a good feeling of touching on the surface.
  • the invention also includes the embodiment where the third fold is omitted.
  • FIG. 4 schematically represents an embossing and bonding unit making it possible to produce the product of FIG. 3. It consists of three embossing groups (A1, C1), (A2, C2) and (A3, C3) each consisting of a cylinder of etched non-deformable material, for example of steel A1, A2, A3 and a cylinder of elastic material, for example of rubber C1, C2, C3 and two conventional gluing groups E1 and E2.
  • the engraving carried by the cylinder A1 has the particularity of being made up of alternating protrusions of different heights.
  • the cylinder A2 carries reliefs of the same pitch as the small protrusions of the cylinder A1 and the cylinder A3 reliefs of the same pitch as the large protrusions of the cylinder A1.
  • the device of FIG. 4 allows the production of a complex between a first fold of paper 1 and a second fold 2 and the production of a complex structure further comprising a third fold 3.
  • the device represented in FIG. 4 can be implemented by replacing one or more folds of paper with several superimposed layers of paper, which will lead to complexes similar to that of FIG. 3, but having four or more layers of paper.
  • FIG. 5 represents a complex composed of four sheets of embossed paper and glued together as in the case of FIG. 3 at two levels, e1 and e'2.
  • the layers 1 and 2 have a structure identical to that of the sheets 1 and 2 of FIG. 3.
  • the sheet 4 ' has an embossing with protrusions of different heights, identical to that of the layer 1.
  • the sheet 3' has an embossing with only one level of protuberances, identical to that of layer 2.
  • the protrusions 33 'of the layer 3' are located in the point-to-point position relative to the small protrusions 42 'of the layer 4' and the large protrusions 41 'of the layer 4' are located in the point-to-point position relative to the large protrusions 11 of layer 1.
  • the bonding is carried out at two levels in the complex: at the points of the protrusions 41 'and 11 and between the sheets 1 and 2 between the points of the protrusions 12 and 22.
  • FIG. 6 represents a device making it possible to produce a product consisting of 4 layers of embossed and glued paper as shown in FIG. 5.
  • This device consists of four embossing groups (A1, C1), (A2, C2), ( A'3, C'3) and (A'4, C'4) each consisting of a cylinder of non-deformable material, for example of engraved steel A1, A2, A'3, A'4 and a cylinder of elastic material, for example rubber, C1, C2, C'3, C'4.
  • the groups (A1, C1) and (A2, C2) are identical to those of FIG. 4.
  • the cylinder A'3 has protuberances of two different dimensions, similar to those of the cylinder A1.
  • the cylinder A'4 has protuberances similar to those of A2.
  • a second fold 2 is embossed between the two cylinders A2 and C2 and the protrusions formed on this fold then come into contact with a gluing device E1.
  • the small protrusions formed on the fold 1 are then glued in point-to-point position with the protrusions of the fold 2 by passing these two folds between the cylinders A1 and A2.
  • a third fold 3 ' is embossed by passage between the cylinders A'4 and C'4.
  • a fourth fold 4 ' is embossed by passage between the cylinder C'3 and the cylinder A'3.
  • the folds 3 'and 4' are then joined between the cylinders A'3 and A'4 to form a mattress in which the protuberances formed on the fold 3 'come in point-to-point position relative to the small protuberances formed on 4', while the large protrusions formed on 4 'are interposed between two protrusions of 3'.
  • the mattress thus formed is bonded between 3 'and 4' at the large protrusions of 4 '.
  • the two mattresses thus formed respectively between the folds 1 and 2 and 3 'and 4' are then glued together by passage between cylinders A1 and A3 to form a complex consisting of four embossed sheets having two levels of bonding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Paper (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Laminated Bodies (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

The invention relates to multi-ply embossed papers, more particularly multi-ply papers containing an embossed sheet (1) of paper exhibiting protuberances of different depths produced during its embossing, characterised in that deeper protuberances (11) called large protuberances alternate with protuberances so that the small protuberances (12) can be placed in a point-to-point position with the protuberances (22) of a second sheet of embossed paper (2) and in that the large protuberances (11) fit between the protuberances (22) of the second sheet (2). The invention also relates to a process and a device for the production of these multi-ply embossed papers. <IMAGE>

Description

La présente invention a pour objet de nouveaux papiers multicouches, un dispositif et un procédé pour les fabriquer.The present invention relates to new multilayer papers, a device and a method for manufacturing them.

L'invention concerne plus particulièrement les papiers utilisables dans le domaine ménager et domestique, en particulier les papiers gaufrés à base de papier crêpé de type ouate de cellulose. Dans ce domaine, on recherche tout particulièrement des papiers ayant de bonnes qualités d'absorption associées à une grande douceur et de bonnes propriétés de résistance mécanique.The invention relates more particularly to papers usable in the household and domestic field, in particular embossed papers based on crepe paper of the cellulose wadding type. In this area, papers are particularly sought after having good absorption qualities associated with great softness and good mechanical resistance properties.

On s'est orienté dans ce domaine, depuis de nombreuses années, vers des papiers présentant plusieurs couches, en général deux ou trois, préalablement gaufrées, puis collées légèrement entre elles, de la colle étant déposée sur les extrémités des protubérances réalisées au cours de l'opération de gaufrage.In this field, we have been oriented for many years towards papers having several layers, in general two or three, previously embossed, then glued slightly together, glue being deposited on the ends of the protuberances produced during the embossing operation.

Deux systèmes différents de gaufrage, d'assemblage et collage sont actuellement utilisées conduisant à deux types de structure différents. Un premier type consiste à réaliser deux gaufrages identiques sur deux plis séparés de papier de façon à réaliser des protubérances sur les feuilles, à former un stratifié à partir de ces deux feuilles, les protubérances des deux feuilles étant dirigées vers la partie interne du stratifié et collées entre elles par leurs extrémités. Ce système réalise ce que l'on conviendra d'appeler un assemblage "pointe-pointe". Un tel procédé, ainsi que les laminés obtenus, est décrit dans le brevet US-A-3 414 459. Un tel système permet essentiellement de faire des papiers à deux couches avec la structure représentée à la figure 6 du brevet US-A-3 414 459. Une autre variante décrite dans ce brevet consiste, comme cela apparaît à la figure 7, à insérer avant le collage des pointes une feuille non gaufrée entre les deux feuilles gaufrées.Two different systems of embossing, assembly and bonding are currently used leading to two different types of structure. A first type consists in making two identical embossings on two separate plies of paper so as to produce protuberances on the sheets, to form a laminate from these two sheets, the protuberances of the two sheets being directed towards the internal part of the laminate and glued together by their ends. This system achieves what will be called a "tip-tip" assembly. Such a process, as well as the laminates obtained, is described in patent US-A-3,414,459. Such a system essentially makes it possible to make two-layer papers with the structure shown in FIG. 6 of patent US-A-3 414 459. Another variant described in this patent consists, as appears in FIG. 7, of inserting before gluing the tips an unembossed sheet between the two embossed sheets.

Un autre procédé décrit en particulier dans le brevet US-A-3 867 225 consiste à réaliser également un stratifié entre deux feuilles gaufrées placées également de façon que les protubérances soient dirigées vers l'intérieur du stratifié, à encoller les extrémités des protubérances d'une des deux feuilles et à réaliser le collage dans une position telle que les protubérances d'une des feuilles viennent s'emboîter entre deux protubérances de l'autre feuille. On conviendra d'appeler structure "emboîtée" ou "nested" la structure obtenue.Another method described in particular in US Pat. No. 3,867,225 consists in also producing a laminate between two embossed sheets also placed so that the protuberances are directed towards the interior of the laminate, by gluing the ends of the protrusions one of the two sheets and making the bonding in a position such that the protrusions of one of the sheets come to fit between two protrusions of the other sheet. We will call the structure "nested" or "nested" the structure obtained.

Le brevet US-A-4 320 162 a proposé un procédé permettant de réaliser des feuilles de papiers multicouches présentant deux séries d'embossages de profondeurs différentes et dans lequel le collage entre les deux feuilles n'est effectué qu'entre les embossages les plus profonds. Le but recherché avec le produit obtenu est une amélioration de la douceur, de la rétention d'eau, du bouffant et de l'esthétique.US Pat. No. 4,320,162 has proposed a method for producing sheets of multilayer paper having two series of embossings of different depths and in which the bonding between the two sheets is carried out only between the most embossing deep. The goal sought with the product obtained is an improvement in softness, water retention, bulk and aesthetics.

Le brevet GB-A-1382714 décrit une feuille multicouche constituée de deux feuilles dont les zones gaufrées sont disposées de telle sorte qu'elles se croisent entre elles permettant ainsi de limiter la surface des zones collées.GB-A-1382714 describes a multilayer sheet consisting of two sheets, the embossed areas are arranged so that they intersect with each other thus limiting the surface of the bonded areas.

Le brevet EP-B-265298 décrit une feuille multicouche composée d'au moins deux feuilles gaufrées dont les protubérances sont disposées selon des traits ou des combinaisons de traits pour réaliser des motifs larges.Patent EP-B-265298 describes a multi-layer sheet composed of at least two embossed sheets, the protuberances of which are arranged in lines or combinations of lines to produce wide patterns.

Ainsi, d'une façon générale, on recherche des assemblages de feuilles de papier gaufré alliant essentiellement douceur, un toucher amélioré, de bonnes propriétés d'absorption avec une bonne résistance mécanique. La demanderesse a poursuivi des travaux dans ce sens et a maintenant trouvé une nouvelle structure gaufrée permettant de faire des stratifiés, par exemple des complexes à trois feuilles présentant à la fois des qualités de douceur amé liorée du fait qu'une plus grande quantité d'air se trouve enfermée entre les couches en même temps qu'une résistance mécanique accrue du fait, en particulier, d'une meilleure rigidité de la structure due en particulier ce que le collage est réalisé à différents niveaux.Thus, in general, we are looking for assemblies of sheets of embossed paper essentially combining softness, improved feel, good absorption properties with good mechanical resistance. The Applicant has continued work in this direction and has now found a new embossed structure making it possible to make laminates, for example three-sheet complexes having both improved qualities of softness because a greater amount of air is trapped between the layers at the same time as an increased mechanical resistance due, in particular, to a better rigidity of the structure due in particular to the fact that bonding is carried out at different levels.

La présente invention propose une nouvelle structure de papier gaufré permettant de réaliser des complexes multicouches associant des qualités jusque-là jamais réunies. Elle propose également un procédé et un dispositif pour réaliser ces complexes multicouches.The present invention proposes a new structure of embossed paper making it possible to produce multilayer complexes combining qualities hitherto never combined. It also proposes a method and a device for producing these multilayer complexes.

La présente invention fournit une nouvelle structure de feuille multicouche de papier gaufré comprenant une première feuille et une deuxième feuille présentant des protubérances de profondeurs différentes réalisées lors de leur gaufrage, caractérisée en ce que la première feuille comprend des protubérances plus profondes dites grandes protubérances alternant avec des protubérances moins profondes dites petites protubérances et la deuxième feuille comprend des protubérances, et en ce que les extrémités des petites protubérances de la première feuille et les protubérances de la deuxième feuille sont collées en position pointe-pointe et les extrémités des grandes protubérances de la première feuille viennent s'emboîter entre deux protubérances de la deuxième feuille.The present invention provides a new multilayer sheet structure of embossed paper comprising a first sheet and a second sheet having protrusions of different depths produced during their embossing, characterized in that the first sheet comprises deeper protrusions known as large protrusions alternating with shallower protrusions called small protrusions and the second sheet includes protrusions, and in that the ends of the small protrusions of the first sheet and the protrusions of the second sheet are glued in point-to-point position and the ends of the large protrusions of the first sheet come to fit between two protrusions of the second sheet.

Selon une autre caractéristique de l'invention, la somme des hauteurs des petites protubérances de la première feuille et des protubérances de la deuxième feuille est au moins égale à la hauteur des grandes protubérances de la première feuille. Selon un mode de réalisation particulier ladite somme est égale à la hauteur des grandes protubérances.According to another characteristic of the invention, the sum of the heights of the small protrusions of the first sheet and the protrusions of the second sheet is at least equal to the height of the large protrusions of the first sheet. According to a particular embodiment, said sum is equal to the height of the large protuberances.

Selon une autre caractéristique de l'invention, les petites protubérances de la première feuille ont la même hauteur que les protubérances de la deuxième feuille.According to another characteristic of the invention, the small protrusions of the first sheet have the same height as the protrusions of the second sheet.

Selon une autre caractéristique, l'invention concerne des complexes comportant en outre une troisième feuille présentant des protubérances dont le pas correspond à celui des grandes protubérances de la première feuille et qui sont collées en position pointe-pointe par rapport aux grandes protubérances de la première feuille.According to another characteristic, the invention relates to complexes further comprising a third sheet having protuberances whose pitch corresponds to that of the large protuberances of the first sheet and which are bonded in point-to-point position relative to the large protuberances of the first leaf.

L'invention concerne également des complexes formés de quatre feuilles dans lesquels les deux premières ont la configuration décrite précédemment et comprenant en outre une troisième feuille présentant un gaufrage identique à celui de la deuxième feuille et une quatrième feuille comportant un gaufrage identique à celui de la première feuille avec des protubérances et des grandes protu- bérances, les petites protubérances de la quatrième feuille étant situées en position pointe-pointe par rapport aux protubérances de la troisième feuille et les grandes protubérances de la quatrième feuille venant s'emboîter entre les protubérances de la troisième feuille, le collage entre les feuilles étant assuré au moins au niveau des grandes protubérances des première et quatrième feuilles.The invention also relates to complexes formed from four sheets in which the first two have the configuration described above and further comprising a third sheet having an embossing identical to that of the second sheet and a fourth sheet comprising an embossing identical to that of the first sheet with protuberances and large protuberances, the small protuberances of the fourth sheet being located in point-to-point position relative to the protuberances of the third sheet and the large protuberances of the fourth sheet coming to fit between the protuberances the third sheet, the bonding between the sheets being provided at least at the level of the large protuberances of the first and fourth sheets.

L'invention concerne également un procédé de préparation des complexes décrits précédemment, en particulier un procédé dans lequel :

  • on crée par gaufrage d'un premier pli des petites et des grandes protubérances sur ce pli.
  • on crée par gaufrage séparé d'un deuxième pli des protubérances sur ce pli, ces protubérances étant séparées entre elles par la même distance que les petites protubérances du premier pli et ayant une hauteur telle que la somme de leur hauteur et de la hauteur d'une petite protubérance du premier pli soit de préférence au moins égale à la hauteur d'une grande protubérance du premier pli,
  • on encolle les extrémités des protubérances du deuxième pli,
  • on réalise un matelas entre les premier et deuxième plis en collant les extrémités des petites protubérances du premier pli avec les extrémités des protubérances du deuxième pli en position pointe-pointe, les grandes protubérances du premier pli venant s'emboîter entre des protubérances du deuxième pli.
The invention also relates to a process for preparing the complexes described above, in particular a process in which:
  • small and large protuberances on this fold are created by embossing a first fold.
  • protrusions on this fold are created by separate embossing of a second ply, these protrusions being separated from one another by the same distance as the small protrusions of the first ply and having a height such that the sum of their height and the height of a small protrusion of the first fold is preferably at least equal to the height of a large protrusion of the first fold,
  • we glue the ends of the protrusions of the second fold,
  • a mattress is produced between the first and second plies by gluing the ends of the small protuberances of the first ply with the ends of the protuberances of the second ply in the point-to-point position, the large protuberances of the first ply interlocking between protuberances of the second ply .

Selon une autre variante de la présente invention, elle concerne un procédé dans lequel :

  • on réalise le gaufrage séparé d'un troisième pli, ce gaufrage présentant un pas identique à celui des grandes protubérances du premier pli,
  • on encolle les extrémités des protubérances réalisées sur ce troisième pli,
  • on réalise le collage du troisième pli et du matelas formé entre les deux premiers plis de façon que les extrémités des protubérances créées sur le troisième pli viennent se coller en position pointe-pointe sur le deuxième pli au niveau des grandes protubérances du premier pli.
According to another variant of the present invention, it relates to a method in which:
  • embossing is carried out separate from a third ply, this embossing having a pitch identical to that of the large protuberances of the first ply,
  • the ends of the protuberances made on this third fold are glued,
  • the third ply and the mattress formed between the first two plies are bonded so that the ends of the protuberances created on the third ply stick in the point-to-point position on the second ply at the level of the large protuberances of the first ply.

Selon une variante de l'invention, elle concerne un procédé pour préparer un complexe comprenant quatre plis dans lequel :

  • on réalise un matelas comme précédemment décrit entre les deux premiers plis,
  • un troisième pli est gaufré pour avoir une configuration identique à celle du deuxième pli,
  • un quatrième pli est gaufré pour avoir une configuration identique à celle du premier pli,
  • les troisième et quatrième plis sont réunis entre eux pour former un matelas dans lequel les protubérances formées sur le troisième pli viennent en position pointe/pointe par rapport aux petites protubérances formées sur le quatrième pli alors que les grandes protubérances du quatrième pli viennent s'intercaler entre deux protubérances du troisième pli,
  • puis on réalise un encollage du matelas, ainsi formé entre les troisième et quatrième plis, au niveau des grandes protubérances du quatrième pli,
  • les deux matelas constitués par les premier et deuxième plis respectivement et les troisième et quatrième plis sont collés entre eux pour former un complexe constitué de quatre feuilles gaufrées et à deux niveaux de collage.
According to a variant of the invention, it relates to a process for preparing a complex comprising four plies in which:
  • a mattress is produced as previously described between the first two folds,
  • a third fold is embossed to have a configuration identical to that of the second fold,
  • a fourth fold is embossed to have a configuration identical to that of the first fold,
  • the third and fourth plies are joined together to form a mattress in which the protuberances formed on the third ply come in point / tip position relative to the small protuberances formed on the fourth ply while the large protuberances of the fourth fold are inserted between two protrusions of the third fold,
  • then a gluing of the mattress, thus formed between the third and fourth plies, is made at the level of the large protuberances of the fourth ply,
  • the two mattresses formed by the first and second plies respectively and the third and fourth plies are glued together to form a complex consisting of four embossed sheets and with two levels of gluing.

Selon d'autres caractéristiques enfin, l'invention concerne un dispositif permettant de réaliser les différents complexes multicouches de la présente invention ou la mise en oeuvre du procédé de l'invention.According to other characteristics finally, the invention relates to a device making it possible to produce the various multilayer complexes of the present invention or the implementation of the method of the invention.

D'autres buts et caractéristiques de l'invention apparaîtront dans la description qui va suivre, faite en référence aux dessins :

  • la figure 1 représente un exemple de complexe formé de trois feuilles gaufrées obtenu dans un procédé de gaufrage et collage pointe-pointe de l'art antérieur ;
  • la figure 2 représente un autre exemple de complexe formé de trois couches gaufrées et collées selon un procédé "nested" de l'art antérieur ;
  • la figure 3 représente un exemple de papier multicouche composé de trois couches selon la présente invention ;
  • la figure 4 représente schématiquement un dispositif permettant de réaliser le papier à trois couches de la figure 3 ;
  • la figure 5 représente un exemple de papier à quatre couches selon la présente invention ;
  • la figure 6 représente schématiquement un dispositif pour réaliser le papier de la figure 5.
Other objects and characteristics of the invention will appear in the description which follows, given with reference to the drawings:
  • FIG. 1 represents an example of a complex formed from three embossed sheets obtained in an embossing and point-to-point bonding process of the prior art;
  • FIG. 2 represents another example of a complex formed from three embossed layers and bonded according to a "nested" method of the prior art;
  • FIG. 3 represents an example of multilayer paper composed of three layers according to the present invention;
  • Figure 4 schematically shows a device for making the three-layer paper of Figure 3;
  • Figure 5 shows an example of four-layer paper according to the present invention;
  • FIG. 6 schematically represents a device for producing the paper of FIG. 5.

La figure 1 représente un stratifié obtenu dans un procédé classique de l'art antérieur de gaufrage et collage en position pointe-pointe où deux feuilles a, b ont été gaufrées simultanément et collées en position pointe-pointe avec une troisième feuille c gaufrée selon le même motif. Dans ce complexe, le collage est réalisé au niveau des pointes e, toutes situées au même niveau.FIG. 1 represents a laminate obtained in a conventional process of the prior art of embossing and gluing in point-to-point position where two sheets a, b were embossed simultaneously and glued in point-to-point position with a third sheet c embossed according to the same pattern. In this complex, bonding is carried out at the points e, all located at the same level.

La figure 2 représente un stratifié composé de trois feuilles gaufrées et collées en position "nested" selon la technique antérieure. Dans cette réalisation, deux feuilles a', b' ont été gaufrées simultanément, les extrémités e' des protubérance de ces deux feuilles viennent se coller en position intercalée entre les protubérances réalisées dans une troisième feuille c'. Là encore, les points d'association entre les trois feuilles se trouvent tous au même niveau.FIG. 2 represents a laminate composed of three embossed sheets and glued in the "nested" position according to the prior art. In this embodiment, two sheets a ', b' have been embossed simultaneously, the ends e ′ of the protuberances of these two sheets are stuck in an interposed position between the protuberances produced in a third sheet c ′. Again, the association points between the three sheets are all at the same level.

La figure 3 représente un complexe selon l'invention composé de trois feuilles gaufrées 1, 2 et 3 : la première feuille 1 présente des protubérances de deux profondeurs différentes, des protubérances 12 de faible profondeur alternant régulièrement avec des protubérances 11 plus profondes.FIG. 3 represents a complex according to the invention composed of three embossed sheets 1, 2 and 3: the first sheet 1 has protuberances of two different depths, protuberances 12 of shallow depth alternating regularly with deeper protuberances 11.

Les extrémités des protubérances 12 sont collées en e1 aux extrémités des protubérances 22 d'une deuxième couche 2, elle aussi gaufrée, alors que les extrémités des protubérances 11 viennent s'intercaler entre deux protubérances de la feuille 2. Une troisième couche constitue le complexe de la figure 3 : cette couche présente un gaufrage de pas identique à celui de la couche 1 pour ce qui concerne les protubérances 11 et les extrémités des protubérances 33 sont collées en e2 sur la couche 2 en position pointe-pointe par rapport aux extrémités des protubérances 11 de la feuille 1.The ends of the protrusions 12 are glued at e1 to the ends of the protrusions 22 of a second layer 2, also embossed, while the ends of the protrusions 11 are interposed between two protrusions of the sheet 2. A third layer constitutes the complex in FIG. 3: this layer has an embossing with a pitch not identical to that of layer 1 with regard to the protuberances 11 and the ends of the protuberances 33 are glued at e2 to the layer 2 in the point-to-point position relative to the ends of the protrusions 11 of sheet 1.

Il est préférable, en ce qui concerne la hauteur des différentes protubérances, que la hauteur des protubérances 11 soit au plus égale à la somme des hauteurs des protubérances 12 et 22.It is preferable, with regard to the height of the different protrusions, that the height of the protrusions 11 be at most equal to the sum of the heights of the protrusions 12 and 22.

Avantageusement, les plis 1 et 3 seront constitués d'une matière particulièrement douce, le pli 2 qui, lui, n'est pas en contact avec l'extérieur, pourra être constitué d'une feuille moins douce au toucher, donc plus résistante sans que cela nuise au toucher de l'ensemble.Advantageously, the folds 1 and 3 will be made of a particularly soft material, the fold 2 which, for its part, is not in contact with the outside, may consist of a sheet which is less soft to the touch, therefore more resistant without that it affects the touch of the whole.

Si l'on compare la structure selon l'invention représentée à la figure 3 avec les structures représentées aux figures 1 et 2, on voit que le complexe selon l'invention présente l'avantage de présenter des points d'association situés sur deux niveaux distincts, ce qui permet une meilleure rigidification et un renforcement de la structure.If we compare the structure according to the invention shown in Figure 3 with the structures shown in Figures 1 and 2, we see that the complex according to the invention has the advantage of having points of association located on two levels distinct, which allows better stiffening and strengthening of the structure.

Par ailleurs, toujours en comparant les complexes selon l'invention de la figure 3 avec ceux de l'art antérieur représentés aux figures 1 et 2, on voit que dans les produits de l'invention on a une augmentation du volume enfermé par les trois feuilles, par rapport à un procédé classique, ce qui conduit à :

  • une augmentation de l'absorption (sachant que l'absorption d'un complexe en ouate de cellulose est due en partie aux fibres, et en partie au volume enfermé par les feuilles),
  • une augmentation du phénomène de moelleux,
  • une augmentation de l'épaisseur.
Furthermore, still by comparing the complexes according to the invention of FIG. 3 with those of the prior art represented in FIGS. 1 and 2, it can be seen that in the products of the invention, has an increase in the volume enclosed by the three sheets, compared to a conventional process, which leads to:
  • an increase in absorption (knowing that the absorption of a cellulose wadding complex is partly due to the fibers, and partly to the volume enclosed by the leaves),
  • an increase in the softness phenomenon,
  • an increase in thickness.

Par ailleurs, le produit de la figure 3 présente une surface extérieure similaire à celle d'un produit pointe-pointe (avec la pointe de gaufrage située vers l'intérieur), donc une bonne sensation de toucher en surface.Furthermore, the product in FIG. 3 has an exterior surface similar to that of a point-to-point product (with the embossing point situated inwards), therefore a good feeling of touching on the surface.

On a décrit un mode de réalisation où les petites protubérances alternent régulièrement avec les grandes protubérances et sont en nombre égal. L'invention comprend également les cas où des groupes d'au moins deux petites protubérances alternent avec les grandes protubérances.An embodiment has been described in which the small protrusions regularly alternate with the large protrusions and are in equal number. The invention also includes cases where groups of at least two small protrusions alternate with the large protrusions.

L'invention comprend également la réalisation où le troisième pli est omis.The invention also includes the embodiment where the third fold is omitted.

La figure 4 représente schématiquement une unité de gaufrage et collage permettant de réaliser le produit de la figure 3. Elle est constituée de trois groupes de gaufrage (A1, C1), (A2, C2) et (A3, C3) constitués chacun d'un cylindre en matériau indéformable gravé, par exemple en acier A1, A2, A3 et d'un cylindre en matériau élastique, par exemple en caoutchouc C1, C2, C3 et de deux groupes classiques d'encollage E1 et E2. La gravure portée par le cylindre A1 présente la particularité d'être constituée de protubérances de hauteurs différentes alternées.FIG. 4 schematically represents an embossing and bonding unit making it possible to produce the product of FIG. 3. It consists of three embossing groups (A1, C1), (A2, C2) and (A3, C3) each consisting of a cylinder of etched non-deformable material, for example of steel A1, A2, A3 and a cylinder of elastic material, for example of rubber C1, C2, C3 and two conventional gluing groups E1 and E2. The engraving carried by the cylinder A1 has the particularity of being made up of alternating protrusions of different heights.

Le cylindre A2 porte des reliefs de même pas que les petites protubérances du cylindre A1 et le cylindre A3 des reliefs de même pas que les grandes protubérances du cylindre A1.The cylinder A2 carries reliefs of the same pitch as the small protrusions of the cylinder A1 and the cylinder A3 reliefs of the same pitch as the large protrusions of the cylinder A1.

Le dispositif de la figure 4 permet la réalisation d'un complexe entre un premier pli de papier 1 et un deuxième pli 2 et la réalisation d'une structure complexe comprenant en outre un troisième pli 3.The device of FIG. 4 allows the production of a complex between a first fold of paper 1 and a second fold 2 and the production of a complex structure further comprising a third fold 3.

En cours de fonctionnement, les différents cylindres tournent dans le sens indiqué par les flèches :

  • le pli 1 en provenance du dévidoir D1 non représenté est gaufré entre A1 et C1 avec une gravure à deux niveaux,
  • le pli 2 en provenance du dévidoir D2 non représenté est gaufré entre A2 et C2, avec une gravure à un seul niveau, la pointe formée par la gravure sur le pli 2 vient au contact du cylindre encolleur E1, qui dépose une quantité de colle sur le pli 2,
  • les plis 1 et 2 sont ensuite associés en position pointe-pointe en appliquant A2 et C2 contre A1, de façon que la petite pointe de gaufrage de 1 soit en contact avec la pointe de 2, la pression de A2 sur A1 et la colle déposée sur la pointe de 2 assurent l'association des 2 plis, réalisant une sorte de matelas entre les plis 1 et 2,
  • le pli 3 en provenance du dévidoir D3 non représenté sera gaufré entre A3 et C3 et, comme 2, il recevra un dépôt de colle sur les pointes formées par le gaufrage,
  • le matelas formé par 1 et 2 pourra s'associer avec le pli 3, par pression de A3 sur A1 entre les pointes formées par A3 et la grande pointe de A1, la colle étant déposée sur les pointes de 3,
  • à la sortie de A3 et A1, le deuxième niveau est réalisé, ainsi que la structure complète.
During operation, the different cylinders rotate in the direction indicated by the arrows:
  • fold 1 coming from the reel D1 not shown is embossed between A1 and C1 with a two-level engraving,
  • the fold 2 coming from the reel D2 not shown is embossed between A2 and C2, with an engraving on a single level, the point formed by the engraving on the fold 2 comes into contact with the gluing cylinder E1, which deposits a quantity of glue on fold 2,
  • folds 1 and 2 are then associated in point-to-point position by applying A2 and C2 against A1, so that the small embossing point of 1 is in contact with the point of 2, the pressure of A2 on A1 and the glue deposited on the tip of 2 ensure the association of the 2 folds, making a sort of mattress between folds 1 and 2,
  • the fold 3 coming from the reel D3 not shown will be embossed between A3 and C3 and, like 2, it will receive a deposit of glue on the points formed by the embossing,
  • the mattress formed by 1 and 2 can be associated with the fold 3, by pressing A3 on A1 between the points formed by A3 and the large point of A1, the glue being deposited on the points of 3,
  • at the end of A3 and A1, the second level is completed, as well as the complete structure.

Le dispositif représenté à la figure 4 peut être mis en oeuvre en remplaçant un ou plusieurs plis de papier par plusieurs couches de papier superposées, ce qui conduira à des complexes analogues à celui de la figure 3, mais présentant quatre couches, voire plus, de papier.The device represented in FIG. 4 can be implemented by replacing one or more folds of paper with several superimposed layers of paper, which will lead to complexes similar to that of FIG. 3, but having four or more layers of paper.

La figure 5 représente un complexe composé de quatre feuilles de papier gaufré et collées entre elles comme dans le cas de la figure 3 à deux niveaux, e1 et e'2. Les couches 1 et 2 ont une structure identique à celle des feuilles 1 et 2 de la figure 3. La feuille 4' présente un gaufrage avec des protubérances de hauteurs différentes, identique à celui de la couche 1. La feuille 3' présente un gaufrage à un seul niveau de protubérances, identique à celui de la couche 2.FIG. 5 represents a complex composed of four sheets of embossed paper and glued together as in the case of FIG. 3 at two levels, e1 and e'2. The layers 1 and 2 have a structure identical to that of the sheets 1 and 2 of FIG. 3. The sheet 4 'has an embossing with protrusions of different heights, identical to that of the layer 1. The sheet 3' has an embossing with only one level of protuberances, identical to that of layer 2.

Les protubérances 33' de la couche 3' sont situées en position pointe-pointe par rapport aux petites protubérances 42' de la couche 4' et les grandes protubérances 41' de la couche 4' sont situées en position pointe-pointe par rapport aux grandes protubérances 11 de la couche 1.The protrusions 33 'of the layer 3' are located in the point-to-point position relative to the small protrusions 42 'of the layer 4' and the large protrusions 41 'of the layer 4' are located in the point-to-point position relative to the large protrusions 11 of layer 1.

Le collage est effectué à deux niveaux dans le complexe : au niveau des pointes des protubérances 41' et 11 et entre les feuilles 1 et 2 entre les pointes des protu- bérances 12 et 22.The bonding is carried out at two levels in the complex: at the points of the protrusions 41 'and 11 and between the sheets 1 and 2 between the points of the protrusions 12 and 22.

La figure 6 représente un dispositif permettant de réaliser un produit constitué de 4 couches de papier gaufré et collé tel que présenté sur la figure 5. Ce dispositif est constitué de quatre groupes de gaufrage (A1, C1), (A2, C2), (A'3, C'3) et (A'4, C'4) constitués chacun d'un cylindre en matériau indéformable, par exemple en acier gravé A1, A2, A'3, A'4 et d'un cylindre en matériau élastique, par exemple en caoutchouc, C1, C2, C'3, C'4. Les groupes (A1, C1) et (A2, C2) sont identiques à ceux de la figure 4. Le cylindre A'3 présente des protubérances de deux dimensions différentes, analogues à celles du cylindre A1. Le cylindre A'4 présente des protubérances analogues à celles de A2.FIG. 6 represents a device making it possible to produce a product consisting of 4 layers of embossed and glued paper as shown in FIG. 5. This device consists of four embossing groups (A1, C1), (A2, C2), ( A'3, C'3) and (A'4, C'4) each consisting of a cylinder of non-deformable material, for example of engraved steel A1, A2, A'3, A'4 and a cylinder of elastic material, for example rubber, C1, C2, C'3, C'4. The groups (A1, C1) and (A2, C2) are identical to those of FIG. 4. The cylinder A'3 has protuberances of two different dimensions, similar to those of the cylinder A1. The cylinder A'4 has protuberances similar to those of A2.

En fonctionnement, les différents cylindres tournent dans le sens indiqué par les flèches. Un premier pli 1 est gaufré entre les deux cylindres A1 et C1.In operation, the different cylinders rotate in the direction indicated by the arrows. A first fold 1 is embossed between the two cylinders A1 and C1.

Un deuxième pli 2 est gaufré entre les deux cylindres A2 et C2 et les protubérances formées sur ce pli viennent ensuite au contact d'un dispositif encolleur E1.A second fold 2 is embossed between the two cylinders A2 and C2 and the protrusions formed on this fold then come into contact with a gluing device E1.

Puis, les petites protubérances formées sur le pli 1 sont ensuite collées en position pointe-pointe avec les protubérances du pli 2 par passage de ces deux plis entre les cylindres A1 et A2.Then, the small protrusions formed on the fold 1 are then glued in point-to-point position with the protrusions of the fold 2 by passing these two folds between the cylinders A1 and A2.

Un troisième pli 3' est gaufré par passage entre les cylindres A'4 et C'4.A third fold 3 'is embossed by passage between the cylinders A'4 and C'4.

Un quatrième pli 4' est gaufré par passage entre le cylindre C'3 et le cylindre A'3.A fourth fold 4 'is embossed by passage between the cylinder C'3 and the cylinder A'3.

Les plis 3' et 4' sont ensuite réunis entre les cylindres A'3 et A'4 pour former un matelas dans lequel les protubérances formées sur le pli 3' viennent en position pointe-pointe par rapport aux petites protubérances formées sur 4', alors que les grandes protubérances formées sur 4' viennent s'intercaler entre deux protubérances de 3'.The folds 3 'and 4' are then joined between the cylinders A'3 and A'4 to form a mattress in which the protuberances formed on the fold 3 'come in point-to-point position relative to the small protuberances formed on 4', while the large protrusions formed on 4 'are interposed between two protrusions of 3'.

Puis on réalise un encollage du matelas ainsi formé entre 3' et 4' au niveau des grandes protubérances de 4'.Then, the mattress thus formed is bonded between 3 'and 4' at the large protrusions of 4 '.

Les deux matelas ainsi constitués respectivement entre les plis 1 et 2 et 3' et 4' sont ensuite collés entre eux par passage entre les cylindres A1 et A3 pour former un complexe constitué de quatre feuilles gaufrées présentant deux niveaux de collage.The two mattresses thus formed respectively between the folds 1 and 2 and 3 'and 4' are then glued together by passage between cylinders A1 and A3 to form a complex consisting of four embossed sheets having two levels of bonding.

Claims (10)

  1. Complex multilayer sheet comprising at least one first embossed sheet (1) and a second embossed sheet (2) of absorbent paper having protuberances of different depths made when they are embossed, characterized in that the sheet (1) comprises deeper, so-called large protuberances (11), alternating regularly with shallower, so-called small protuberances (12) and the sheet (2) comprises protuberances (22), and in that the ends of the small protuberances (12) of the first sheet (1) and the protuberances (22) of the second sheet (2) are glued in a point-to-point position and the ends of the large protuberances (11) of the first sheet (1) nest in between two protuberances of the second sheet (2).
  2. Complex sheet according to claim 1, characterised in that the sum of the heights of the small protuberances (12) of the first sheet (1) and the protuberances (22) of the second sheet (2) is at least equal to the height of the large protuberances (11) of the first sheet (1).
  3. Complex sheet according to claim 2, characterised in that the small protuberances (12) of the first sheet (1) have the same height as the protuberances (22) of the second sheet (2).
  4. Complex sheet according to one of claims 1 to 3,
    characterised in that it comprises in addition a third sheet (3) having protuberances (33), the pitch of which corresponds to that of the large protuberances of the first sheet (1) and which are glued in a point-to-point position in relation to the said large protuberances (11) of the first sheet (1).
  5. Complex sheet according to one of claims 1 to 3,
    characterised in that it comprises in addition a third sheet (3') have an embossing with protuberances (33') identical to that of the second sheet (2) and a fourth sheet comprising an embossing identical to that of the first sheet (1) with small protuberances (42') and large protuberances (41'), the small protuberances of the fourth sheet (4') being situated in a point-to-point position in relation to the protuberances (33') of the third sheet (3') and the large protuberances (41') of the fourth sheet (4') nesting between the protuberances (33') of the third sheet and gluing being carried out at least at the level of the large protuberances (11) and (41') of the first and fourth sheets (1) and (4').
  6. Process for preparing the complex sheet according to one of claims 1 to 3, characterized in that :
    - by embossing a first ply (1), small (12) and large (11) protuberances are created on this ply,
    - by separately embossing a second ply (2) protuberances (22) are created on this ply, these protuberances being separated from each other by the same distance as the small protuberances of the first ply (1) and having a height such that the sum of their height and the height of a small protuberance of the first ply (1) is at least equal to the height of a large protuberance of the first ply (1),
    - the ends of the protuberances of the second ply (2) are glued,
    - a mat is made between the first and second plies (1) and (2) by gluing the ends of the small protuberances of the first ply (1) to the ends of the protuberances of the second ply (2) in a point-to-point position, the large protuberances of the ply (1) nesting between the protuberances of the second ply (2).
  7. Process according to claim 6 for the preparation of the complex according to claim 4 characterized in that :
    - a third ply (3) is embossed separately, the embossing having a pitch corresponding to that of the large protuberances of the first ply (1),
    - the ends of the protuberances produced on this third ply (3) are glued,
    - the third ply (3) and the mat formed between the first two plies (1) and (2) are glued so that the ends of the protuberances created between the third ply (3) are glued in a point-to-point position on the second ply (2) at the level of the large protuberances of the first ply (1).
  8. Process according to claim 6 for the preparation of a complex according to claim 5, characterized in that :
    - a third ply (3') is embossed to have an identical configuration to that of the second ply (2),
    - a fourth ply (4') is embossed to have an identical configuration to that of the first ply (1),
    - the third and fourth plies (3') and (4') are brought together to form a mat in which the protuberances formed on the third ply (3') come into a point-to-point position relative to the small protuberances formed on the fourth ply (4') while the large protuberances of the fourth ply (4') are interposed between two protuberances of the third ply (3'),
    - the two mats consisting of the first and second plies (1) and (2) respectively and the third and fourth plies (3') and (4') are glued together to form a complex consisting of four embossed sheets, with two gluing levels.
  9. Device for producing a complex according to one of claims 1 to 4 or the application of the process according to claim 7, characterized in that it comprises :
    - three embossing units (A1,C1), (A2, C2) and (A3, C3) each consisting of two cylinders, a first cylinder being made of engraved, dimensionally stable material (A1, A2, A3) and a second cylinder made of elastic material (C1, C2, C3), the first cylinder (A1) having alternate protuberances of two dimensions,
    - two gluing units (E1, E2)
  10. Device enabling the complex according to claim 5 to be produced or the process according to claim 8 to be put into practice, characterized in that it comprises four embossing units (A1, C1), (A2, C2). (A'3, C'3), (A'4, C'4) each consisting of two cylinders, one of which (A1, A2, A'3, A'4) is made of an engraved dimensionally stable material and the other (C1, C2, C'3, C'4) is made of elastic material, two of the cylinders (A1) and (A'3) having two different engraving levels, and at least two gluing units (E1 and E2).
EP93400721A 1992-03-31 1993-03-22 New embossed multiply papers, apparatus and process for making the same Expired - Lifetime EP0564319B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9203903A FR2689149B1 (en) 1992-03-31 1992-03-31 NEW MULTILAYER EMBOSSED PAPERS. DEVICE AND METHOD FOR THEIR PREPARATION.
FR9203903 1992-03-31

Publications (2)

Publication Number Publication Date
EP0564319A1 EP0564319A1 (en) 1993-10-06
EP0564319B1 true EP0564319B1 (en) 1996-08-28

Family

ID=9428307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93400721A Expired - Lifetime EP0564319B1 (en) 1992-03-31 1993-03-22 New embossed multiply papers, apparatus and process for making the same

Country Status (9)

Country Link
US (1) US5382464A (en)
EP (1) EP0564319B1 (en)
AT (1) ATE141976T1 (en)
DE (1) DE69304237T2 (en)
DK (1) DK0564319T3 (en)
ES (1) ES2093374T3 (en)
FI (1) FI98395C (en)
FR (1) FR2689149B1 (en)
GR (1) GR3021350T3 (en)

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Also Published As

Publication number Publication date
DK0564319T3 (en) 1996-09-16
FI98395B (en) 1997-02-28
EP0564319A1 (en) 1993-10-06
FR2689149A1 (en) 1993-10-01
GR3021350T3 (en) 1997-01-31
FI931453A (en) 1993-10-01
FR2689149B1 (en) 1994-05-13
ES2093374T3 (en) 1996-12-16
US5382464A (en) 1995-01-17
FI98395C (en) 1997-06-10
DE69304237T2 (en) 1997-01-16
ATE141976T1 (en) 1996-09-15
DE69304237D1 (en) 1996-10-02
FI931453A0 (en) 1993-03-31

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