EP0570579A1 - Complex sheets of absorbent paper - Google Patents

Complex sheets of absorbent paper

Info

Publication number
EP0570579A1
EP0570579A1 EP93902304A EP93902304A EP0570579A1 EP 0570579 A1 EP0570579 A1 EP 0570579A1 EP 93902304 A EP93902304 A EP 93902304A EP 93902304 A EP93902304 A EP 93902304A EP 0570579 A1 EP0570579 A1 EP 0570579A1
Authority
EP
European Patent Office
Prior art keywords
bosses
pattern
sheet
sheets
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.)
Granted
Application number
EP93902304A
Other languages
German (de)
French (fr)
Other versions
EP0570579B1 (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.)
Essity Operations France SAS
Original Assignee
Kaysersberg SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Kaysersberg SA filed Critical Kaysersberg SA
Publication of EP0570579A1 publication Critical patent/EP0570579A1/en
Application granted granted Critical
Publication of EP0570579B1 publication Critical patent/EP0570579B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/07—Embossing, i.e. producing impressions formed by locally deep-drawing, e.g. using rolls provided with complementary profiles
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0738—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
    • B31F2201/0764—Multi-layered the layers being nested
    • 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
    • B31F2201/0766—Multi-layered the layers being superposed tip to tip
    • 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.]
    • Y10T428/24752—Laterally noncoextensive components
    • Y10T428/24769—Cellulosic
    • 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.]
    • Y10T428/24777—Edge feature
    • Y10T428/24785—Edge feature including layer embodying mechanically interengaged strands, strand portions or strand-like strips [e.g., weave, knit, etc.]
    • 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
    • Y10T428/24—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
    • Y10T428/24992—Density or compression of components

Definitions

  • the present invention relates to new complex sheets of absorbent paper.
  • 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.
  • a first type consists in making two identical embossings on two separate folds of paper, so as to produce protuberances on the sheets, and in forming a laminate from these two sheets, the protuberances of the two sheets being directed towards the internal part of the laminated and glued together by their vertices.
  • 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. It 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 it appears in FIG.
  • the object of the present invention is to improve the feel, flexibility and visual appearance of the complex sheets of absorbent paper known in the prior art and in particular of the products assembled according to the tip-tip technique or the "nested" technique mentioned. above, each fold of which has an embossing pattern with bosses of height between approximately 0.5 mm and 2.5 mm, density between 3 and 20 bosses per cm 2 , and representing 5 to 60% of the total from the surface.
  • this result is achieved with a complex sheet of paper of the type described above, characterized in that said embossed sheet comprises a second embossing pattern with bosses 0.1 to 0.30 mm high surrounding the bosses of the first motif.
  • This embossing which can be described as micro-embossing, by occupying the spaces between the bosses of greater depth, gives the sheet a more textile appearance, pleasant to the eye. In addition, it improves the feel and flexibility of it.
  • the density of the second pattern is between 20 and 300 bosses by c ⁇ r (Beyond 300, it is no longer possible to discern the bosses; the sheet appears smooth) and in particular between 40 and 100.
  • the ratio between the density of the second pattern and that of the first pattern is greater than 2 so that at least one micro-boss is included between any two bosses of the first pattern.
  • US Pat. No. 4,320,162 which has proposed a structure with two sheets of paper each having two embossing patterns: a first relatively spaced pattern with wide and deep bosses of 1 to 2.3 mm, and a second pattern more clamped with thin bosses, surrounding the former, only 0.38 to 1.27 mm deep.
  • the two sheets are glued together by the top of the bosses of the first pattern. It is specified that the relatively wide spacing of the bosses of the first pattern allows the bosses of the second pattern to come into contact through their top, due to the flexing of the sheet. This second pattern thus gives softness, absorption and volume to the double sheet, and improves its appearance.
  • the complex sheet of the present invention is distinguished, from that proposed by this patent, by the first pattern which is of density greater than 3 bosses per cm 2 with a covered area of 5 to 60%, whereas in the patent this one consists of relatively large bosses, each reproducing the design of a flower according to the example presented, and widely spaced from each other.
  • the bosses of the second pattern have a maximum depth of 0.30 mm (the depth chosen depends essentially on the grammage: 0.1 mm for a low grammage and 0.30 mm for a grammage heavier)
  • the bosses of the second pattern according to patent 4 320 162 have a depth of 0.38 to 1.27 mm, determined according to the weight of the embossed sheet, and their function is to come into contact by their top precisely because the wide spacing of the bosses of the first pattern.
  • FIG. 1 shows a complex sheet according to the invention assembled according to the tip-tip mode.
  • FIG. 2 shows a complex sheet according to the invention assembled according to the "nested" mode.
  • FIG. 3 shows an installation for producing sheets according to the invention.
  • FIG. 1 there is shown, in enlarged section, a complex sheet according to the invention.
  • This complex sheet is made up of two sheets (1) and (2) of crepe absorbent paper, the characteristics of which are commonly dependent on the desired application: toilet paper, paper towel, napkin, tablecloth, etc.
  • This paper is in grammage between 12 and 30g / m 2 . also according to the envisaged application, and its creping rate is preferably between 10 and 30%.
  • the thickness of such a creped sheet, before any embossing, is between 0.07 and 0.2 mm.
  • each sheet (1) and (2) comprises a first relatively deep embossing pattern (3). The two sheets are linked together and glued by the tops of the bosses of this first pattern. This assembly is known as point-pointes.
  • the bosses have a height H of between 0.5 mm and 2.5 mm (the height is measured between the plane of the plane face and the plane defined by the top of the bosses). They are distributed in a pattern, generally regular, any with a density of 3 to 19 bosses per cm 2 and occupy 5 to 60% of the surface.
  • the boss section can be any: circular, oval or other.
  • At least one sheet, both in the example shown, of the complex sheet comprises a second embossing pattern (4) consisting of thinner bosses and of small height h, between 0.1 and 0 , 30 mm, distributed between the bosses of the first pattern.
  • the choice of height depends on the grammage and the creping rate of the paper; for example, for a paper of 30g / mm 2 with a coarse creping, the height of the bosses will be chosen at 0.25 or 0.30 mm. For a light weight paper, this height may be between 0.1 and 0.2 mm.
  • the density of the bosses of this pattern is greater than that of the first pattern, preferably it must be in a ratio at least greater than 2. It is possible to provide a third sheet interposed between the two embossed sheets without thereby leaving the frame of the invention.
  • FIG 2 there is shown an assembly of sheets (1) and (2) according to the so-called "nested" mode where the bosses (3) of the sheet (1) corresponding to the first pattern are nested between the bosses (3) from the second sheet (2).
  • the connection between the two plies is ensured by a layer of glue deposited on the top of the bosses of the first pattern of one of the two sheets.
  • FIG 3 there is shown a first pair of cylinders (101, 103) having an engraved metal cylinder (101) on the surface of which are embossed according to the pattern wish.
  • the metal cylinder is rotated about a horizontal axis and is associated with a rubber cylinder (103) which is parallel to it, and with which it provides a tightening interval (101, 103). While passing in this interval, a sheet of absorbent paper in cellulose wadding undergoes permanent mechanical deformations by the pressure exerted by the reliefs of the metal cylinder.
  • the reliefs of the cylinder are distributed in two patterns: a first pattern with protrusions of height at least equal to 2 mm and a second pattern with protrusions of height equal to 0.6 mm for example.
  • the installation comprises a second pair of embossing cylinders with a metal cylinder (105) of the same diameter and rotating in the same horizontal plane as the cylinder (101), it cooperates with a rubber cylinder (107) for embossing.
  • the cylinders (101) and (105) provide a tightening interval between them (101, 105) and are driven at opposite, synchronous speeds of rotation, so as to roll over one another without sliding.
  • the installation also includes a gluing system (110) with an applicator cylinder (111) (made of rubber or other equivalent material) bearing on the cylinder (101) upstream of the tightening interval (101, 105).
  • a transfer cylinder (113) transfers the adhesive from a plunger cylinder (115) to the applicator cylinder (111).
  • the plunger cylinder (115) collects the glue in a container.
  • the sheets (1, 2) of absorbent paper to be associated are fed from reels (21, 22).
  • the sheet (1) is guided around the rubber cylinder (103) and passes through the tightening interval (101, 103) from which it emerges embossed, following the raised surface of the metal cylinder (101).
  • the applicator cylinder (111) then deposits adhesive, in metered quantity, on the surface of the protuberances of the sheet, forming flats.
  • the second sheet (2) also undergoes a mechanical embossing treatment, by passing through the tightening interval

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Sanitary Thin Papers (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Cartons (AREA)

Abstract

The compound sheet made of absorbent paper consists of at least two crepe paper sheets with a specific weight between 12 and 30 g/m2. At least one sheet includes a first embossing pattern with bosses pointing inward the compound sheet and having a height of between 0.5 and 2.5 mm, a density of between 3 and 20 bosses per cm2 and covering 5 to 60% of the surface. The compound sheet is characterized in that the embossed sheet comprises a second embossing pattern with bosses 0.1 to 0.30 mm high.

Description

FEUILLES COMPLEXES DE PAPIER ABSORBANT COMPLEX SHEETS OF ABSORBENT PAPER
La présente invention a pour objet de nouvelles feuilles complexes de papier absorbant. 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 present invention relates to new complex sheets of absorbent paper. 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 le sommet 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 top of the protuberances produced during the embossing operation.
Deux systèmes différents de gaufrage, d'assemblage et collage sont actuellement utilisés 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, et 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 sommets. Ce système réalise ce que l'on conviendra d'appeler un assemblage "pointe-pointe". Un tel procédé, ainsi que les stratifiés obtenus, est décrit dans le brevet US-A-3 414 459. Il permet essentiellement de confectionner 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. Un autre procédé décrit en particulier dans le brevet US-A-3 867 225 consiste à réaliser un stratifié entre deux feuilles gaufrées placées également de façon que les protubérances soient dirigées vers 1'intérieur du stratifié : on encolle les sommets des protubérances de l'une des deux feuilles et on réalise le collage dans une position telle que les protubérances de l'une des feuilles viennent s'emboîter entre deux protubérances de l'autre feuille. On conviendra d'appeler structure "emboîtée" ou "nested" la struc¬ ture obtenue.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 folds of paper, so as to produce protuberances on the sheets, and in forming a laminate from these two sheets, the protuberances of the two sheets being directed towards the internal part of the laminated and glued together by their vertices. 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. It 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 it 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 producing a laminate between two embossed sheets also placed so that the protuberances are directed towards the interior of the laminate: the tops of the protuberances of the laminate are glued. one of the two sheets and bonding is carried out in a position such that the protuberances of one of the sheets come to fit between two protuberances of the other sheet. We will call the structure "nested" or "nested" the structure obtained.
La présente invention a pour objet d'améliorer le toucher, la souplesse et l'aspect visuel des feuilles complexes de papier absorbant connues dans l'art antérieur et en particulier des produits assemblés selon la technique pointe-pointe ou la technique "nested" mentionnées ci-dessus dont chaque pli présente un motif de gaufrage avec des bossages de hauteur comprise entre environ 0,5 mm et 2,5 mm, de densité comprise entre 3 et 20 bossages par cm2, et représentant 5 à 60 % de la totalité de la surface.The object of the present invention is to improve the feel, flexibility and visual appearance of the complex sheets of absorbent paper known in the prior art and in particular of the products assembled according to the tip-tip technique or the "nested" technique mentioned. above, each fold of which has an embossing pattern with bosses of height between approximately 0.5 mm and 2.5 mm, density between 3 and 20 bosses per cm 2 , and representing 5 to 60% of the total from the surface.
Conformément à l'invention on parvient à ce résultat avec une feuille complexe de papier de type décrit ci-dessus caractérisée en ce que ladite feuille gaufrée comprend un deuxième motif de gaufrage avec des bossages de 0,1 à 0,30 mm de haut entourant les bossages du premier motif.In accordance with the invention, this result is achieved with a complex sheet of paper of the type described above, characterized in that said embossed sheet comprises a second embossing pattern with bosses 0.1 to 0.30 mm high surrounding the bosses of the first motif.
Ce gaufrage, que l'on peut qualifier de micro-gaufrage, en occupant les espaces entre les bossages de profondeur plus importante, confère à la feuille un aspect plus textile, agréable à la vue. En outre, il améliore le toucher et la souplesse de celle-ci.This embossing, which can be described as micro-embossing, by occupying the spaces between the bosses of greater depth, gives the sheet a more textile appearance, pleasant to the eye. In addition, it improves the feel and flexibility of it.
De préférence, la densité du deuxième motif est comprise entre 20 et 300 bossages par cπr (Au delà de 300, il n'est plus possible de discerner les bossages ; la feuille paraît lisse) et en particulier entre 40 et 100. Avantageusement, le rapport entre la densité du deuxième motif et celle du premier motif est supérieur à 2 de telle sorte qu'au moins un micro-bossage soit compris entre deux bossages quelconques du premier motif.Preferably, the density of the second pattern is between 20 and 300 bosses by cπr (Beyond 300, it is no longer possible to discern the bosses; the sheet appears smooth) and in particular between 40 and 100. Advantageously, the ratio between the density of the second pattern and that of the first pattern is greater than 2 so that at least one micro-boss is included between any two bosses of the first pattern.
La Demanderesse connaît le brevet US 4 320 162 qui a proposé une structure à deux feuilles de papier présentant chacune deux motifs de gaufrage : un premier motif relativement espacé avec des bossages larges et profonds de 1 à 2,3 mm, et un deuxième motif plus serré avec des bossages minces, entourant les premiers, profonds de 0,38 à 1,27 mm seulement. Les deux feuilles sont collées entre elles par le sommet des bossages du premier motif. Il est précisé que l'espacement relativement large des bossages du premier motif permet aux bossages du deuxième motif de venir en contact par leur sommet, du fait de la flexion de la feuille. Ce deuxième motif confère ainsi douceur, absorption et volume à la double feuille, et améliore son aspect.The Applicant knows US Pat. No. 4,320,162 which has proposed a structure with two sheets of paper each having two embossing patterns: a first relatively spaced pattern with wide and deep bosses of 1 to 2.3 mm, and a second pattern more clamped with thin bosses, surrounding the former, only 0.38 to 1.27 mm deep. The two sheets are glued together by the top of the bosses of the first pattern. It is specified that the relatively wide spacing of the bosses of the first pattern allows the bosses of the second pattern to come into contact through their top, due to the flexing of the sheet. This second pattern thus gives softness, absorption and volume to the double sheet, and improves its appearance.
La feuille complexe de la présente invention se distingue, de celle proposée par ce brevet, par le premier motif qui est de densité supérieure à 3 bossages par cm2 avec une surface couverte de 5 à 60 %, alors que dans le brevet celui-ci est constitué de bossages relativement larges, chacun reproduisant le dessin d'une fleur selon l'exemple présenté, et largement espacés les uns des autres. En outre, alors que, selon l'invention, les bossages du deuxième motif ont une profondeur maximale de 0,30 mm (la profondeur choisie dépendant essentiellement du grammage : 0,1 mm pour un faible grammage et 0,30 mm pour un grammage plus lourd) les bossages du deuxième motif selon le brevet 4 320 162 ont une profondeur de 0,38 à 1,27 mm, déterminée selon le poids de la feuille gaufrée, et leur fonction est de venir en contact par leur sommet du fait précisément du large espacement des bossages du premier motif.The complex sheet of the present invention is distinguished, from that proposed by this patent, by the first pattern which is of density greater than 3 bosses per cm 2 with a covered area of 5 to 60%, whereas in the patent this one consists of relatively large bosses, each reproducing the design of a flower according to the example presented, and widely spaced from each other. In addition, while, according to the invention, the bosses of the second pattern have a maximum depth of 0.30 mm (the depth chosen depends essentially on the grammage: 0.1 mm for a low grammage and 0.30 mm for a grammage heavier) the bosses of the second pattern according to patent 4 320 162 have a depth of 0.38 to 1.27 mm, determined according to the weight of the embossed sheet, and their function is to come into contact by their top precisely because the wide spacing of the bosses of the first pattern.
D'autres caractéristiques et avantages de la feuille complexe conforme à l'invention apparaîtront à la lecture de la description _ui suit de deux modes de réalisation accompagnée des dessins annexés sur lesquelsOther characteristics and advantages of the complex sheet in accordance with the invention will appear on reading the following description of two embodiments accompanied by the accompanying drawings in which
- la figure 1 représente une feuille complexe conforme à l'invention assemblée selon le mode pointe-pointe.- Figure 1 shows a complex sheet according to the invention assembled according to the tip-tip mode.
- la figure 2 représente une feuille complexe conforme à l'invention assemblée selon le mode "nested".- Figure 2 shows a complex sheet according to the invention assembled according to the "nested" mode.
- la figure 3 représente une installation permettant la réalisation de feuilles selon l'invention.- Figure 3 shows an installation for producing sheets according to the invention.
Sur la figure 1 on a représenté, en coupe agrandie, une feuille complexe selon l'invention. Cette feuille complexe est constituée de deux feuilles (1) et (2) de papier absorbant crêpé dont les caractéristiques sont communément fonction de l'application souhaitée : papier toilette, essuie-tout, serviette de table, nappe, etc... Ce papier est de grammage compris entre 12 et 30g/m2. également selon l'application envisagée, et son taux de crêpage est de préférence compris entre 10 et 30 %. L'épaisseur d'une telle feuille crêpée, avant tout gaufrage, est comprise entre 0,07 et 0,2 mm. Comme on peut la voir sur la figure chaque feuille (1) et (2) comprend un premier motif de gaufrage (3) relativement profond. Les deux feuilles sont liées entre elles et collées par les sommets des bossages de ce premier motif. Cet assemblage est connu sous le nom pointes-pointes.In Figure 1 there is shown, in enlarged section, a complex sheet according to the invention. This complex sheet is made up of two sheets (1) and (2) of crepe absorbent paper, the characteristics of which are commonly dependent on the desired application: toilet paper, paper towel, napkin, tablecloth, etc. This paper is in grammage between 12 and 30g / m 2 . also according to the envisaged application, and its creping rate is preferably between 10 and 30%. The thickness of such a creped sheet, before any embossing, is between 0.07 and 0.2 mm. As can be seen in the figure, each sheet (1) and (2) comprises a first relatively deep embossing pattern (3). The two sheets are linked together and glued by the tops of the bosses of this first pattern. This assembly is known as point-pointes.
Dans ce type de produit, les bossages ont une hauteur H comprise entre 0,5 mm et 2,5 mm (la hauteur est mesurée entre le plan de la face plane et le plan défini par le sommet des bossages). Ils sont répartis selon un motif, généralement régulier, quelconque avec une densité de 3 à 19 bossages au cm2 et occupent 5 à 60 % de la surface. La section des bossages peut être quelconque : circulaire, ovale ou autre.In this type of product, the bosses have a height H of between 0.5 mm and 2.5 mm (the height is measured between the plane of the plane face and the plane defined by the top of the bosses). They are distributed in a pattern, generally regular, any with a density of 3 to 19 bosses per cm 2 and occupy 5 to 60% of the surface. The boss section can be any: circular, oval or other.
Conformément à l'invention, au moins une feuille, les deux dans l'exemple représenté, de la feuille complexe comprend un deuxième motif de gaufrage (4) constitué de bossages plus fins et de faible hauteur h, comprise entre 0,1 et 0,30 mm, repartis entre les bossages du premier motif. Le choix de la hauteur dépend du grammage et du taux de crêpage du papier ; par exemple, pour un papier de 30g/mm2 avec un crêpage grossier, la hauteur des bossages sera choisie à 0,25 ou 0,30 mm. Pour un papier de grammage léger, cette hauteur pourra être comprise entre 0,1 et 0,2 mm. La densité des bossages de ce motif est supérieure à celle du premier motif, de préférence elle devra être dans un rapport au moins supérieur à 2. II est possible de prévoir une troisième feuille intercalée entre les deux feuilles gaufrées sans sortir pour autant du cadre de l'invention.According to the invention, at least one sheet, both in the example shown, of the complex sheet comprises a second embossing pattern (4) consisting of thinner bosses and of small height h, between 0.1 and 0 , 30 mm, distributed between the bosses of the first pattern. The choice of height depends on the grammage and the creping rate of the paper; for example, for a paper of 30g / mm 2 with a coarse creping, the height of the bosses will be chosen at 0.25 or 0.30 mm. For a light weight paper, this height may be between 0.1 and 0.2 mm. The density of the bosses of this pattern is greater than that of the first pattern, preferably it must be in a ratio at least greater than 2. It is possible to provide a third sheet interposed between the two embossed sheets without thereby leaving the frame of the invention.
Sur la figure 2, on a représenté un assemblage de feuilles (1) et (2) selon le mode dit "nested" où les bossages (3) de la feuille (1) correspondant au premier motif sont emboîtés entre les bossages (3) de la deuxième feuille (2). La liaison entre les deux plis est assurée par une couche de colle déposée sur le sommet des bossages du premier motif de l'une des deux feuilles.In Figure 2, there is shown an assembly of sheets (1) and (2) according to the so-called "nested" mode where the bosses (3) of the sheet (1) corresponding to the first pattern are nested between the bosses (3) from the second sheet (2). The connection between the two plies is ensured by a layer of glue deposited on the top of the bosses of the first pattern of one of the two sheets.
On décrit ci-après une installation connue en soi, permettant de réaliser la feuille de l'invention.An installation known per se is described below, making it possible to produce the sheet of the invention.
Sur la figure 3, on a représenté une première paire de cylindres (101, 103) comportant un cylindre métallique gravé (101) à la surface duquel sont implantés des reliefs selon le motif souhaité. Le cylindre métallique est entraîné en rotation autour d'un axe horizontal et est associé à un cylindre en caoutchouc (103) qui lui est parallèle, et avec lequel il ménage un intervalle de serrage (101, 103). En passant dans cet intervalle, une feuille de papier absorbant en ouate de cellulose subit des déformations mécaniques permanentes par la pression exercée par les reliefs du cylindre métallique.In Figure 3, there is shown a first pair of cylinders (101, 103) having an engraved metal cylinder (101) on the surface of which are embossed according to the pattern wish. The metal cylinder is rotated about a horizontal axis and is associated with a rubber cylinder (103) which is parallel to it, and with which it provides a tightening interval (101, 103). While passing in this interval, a sheet of absorbent paper in cellulose wadding undergoes permanent mechanical deformations by the pressure exerted by the reliefs of the metal cylinder.
Pour la réalisation du gaufrage souhaité, les reliefs du cylindre sont répartis selon deux motifs : un premier motif avec des protubérances de hauteur au moins égale à 2 mm et un deuxième motif avec des protubérances de hauteur égale à 0,6 mm par exemple.To achieve the desired embossing, the reliefs of the cylinder are distributed in two patterns: a first pattern with protrusions of height at least equal to 2 mm and a second pattern with protrusions of height equal to 0.6 mm for example.
L'installation comporte une deuxième paire de cylindres de gaufrage avec un cylindre métallique (105) de même diamètre et tournant dans le même plan horizontal que le cylindre (101), il coopère avec un cylindre en caoutchouc (107) pour le gaufrage.The installation comprises a second pair of embossing cylinders with a metal cylinder (105) of the same diameter and rotating in the same horizontal plane as the cylinder (101), it cooperates with a rubber cylinder (107) for embossing.
Les cylindres (101) et (105) ménagent entre eux un intervalle de serrage (101, 105) et sont entraînés à des vitesses de rotation, opposées, synchrones, de manière à rouler l'un sur l'autre sans glissement. L'installation comprend également un système d'encollage (110) avec cylindre applicateur (111) (en caoutchouc ou autre matériau équivalent) venant en appui sur le cylindre (101) en amont de l'intervalle de serrage (101, 105). Un cylindre de transfert (113), transfère l'adhésif depuis un cylindre plongeur (115) sur le cylindre applicateur (111). Le cylindre plongeur (115) prélève la colle dans un bac.The cylinders (101) and (105) provide a tightening interval between them (101, 105) and are driven at opposite, synchronous speeds of rotation, so as to roll over one another without sliding. The installation also includes a gluing system (110) with an applicator cylinder (111) (made of rubber or other equivalent material) bearing on the cylinder (101) upstream of the tightening interval (101, 105). A transfer cylinder (113) transfers the adhesive from a plunger cylinder (115) to the applicator cylinder (111). The plunger cylinder (115) collects the glue in a container.
Les feuilles (1, 2) de papier absorbant à associer sont alimentées depuis des bobines (21, 22). La feuille (1) est guidée autour du cylindre en caoutchouc (103) et passe dans l'intervalle de serrage (101, 103) dont elle ressort gaufrée, en épousant la surface en relief du cylindre métallique (101). Le cylindre applicateur (111) dépose ensuite de la colle, en quantité dosée, sur la surface des protubérances de la feuille, formant méplats.The sheets (1, 2) of absorbent paper to be associated are fed from reels (21, 22). The sheet (1) is guided around the rubber cylinder (103) and passes through the tightening interval (101, 103) from which it emerges embossed, following the raised surface of the metal cylinder (101). The applicator cylinder (111) then deposits adhesive, in metered quantity, on the surface of the protuberances of the sheet, forming flats.
La deuxième feuille (2) subit également un traitement mécanique de gaufrage, par passage dans l'intervalle de serrageThe second sheet (2) also undergoes a mechanical embossing treatment, by passing through the tightening interval
(105, 107), puis est associée à la feuille (1) dans l'intervalle de serrage (101, 105). La feuille complexe qui en résulte est mise en bobine en attendant d'être transformée ultérieurement. Il est possible de réaliser les feuilles de l'invention en deux étapes. C'est à dire gaufrer préalablement l'une et/ou les deux feuilles avec le second motif puis gaufrer à nouveau selon le premier motif. Le mode de réalisation de la figure 3 s'applique prêférentiellement à une association de type pointe/pointe.(105, 107), then is associated with the sheet (1) in the tightening interval (101, 105). The resulting complex sheet is rolled up until further processing. It is possible to produce the sheets of the invention in two stages. In other words, emboss one and / or both sheets beforehand with the second pattern, then emboss again according to the first pattern. The embodiment of FIG. 3 preferably applies to a tip / tip type association.
Pour l'association "nested", on utilisera prêférentiellement des installations connues de l'art antérieur.For the “nested” association, use will preferably be made of installations known from the prior art.
L'invention n'est pas limitée au mode de réalisation décrit, elle s'étend à toutes les variations à la portée de l'homme de l'art. The invention is not limited to the embodiment described, it extends to all variations within the reach of ordinary skill in the art.

Claims

REVENDICATIONS
1) Feuille complexe de papier absorbant composée d'au moins deux feuilles (1,2) de papier crêpé de grammage compris entre 12 et 30g/mm, l'une au moins présentant un premier motif de gaufrage (3) avec des bossages dirigés vers l'intérieur du complexe, de hauteur comprise entre 0,5 et 2,5 mm, de densité comprise entre 3 et 20 bossage par cm2, et représentant de 5 à 60 % de la surface caractérisée en ce que ladite feuille gaufrée comprend un deuxième motif de gaufrage (4) avec des bossages de 0,1 à 0,30 mm de haut.1) Complex sheet of absorbent paper composed of at least two sheets (1,2) of crepe paper with a grammage of between 12 and 30 g / mm, at least one having a first embossing pattern (3) with directed bosses towards the inside of the complex, of height between 0.5 and 2.5 mm, of density between 3 and 20 boss per cm 2 , and representing from 5 to 60% of the surface characterized in that said embossed sheet comprises a second embossing pattern (4) with bosses 0.1 to 0.30 mm high.
2) Feuille complexe selon la revendication 1 caractérisée en ce que la hauteur des bossages du second motif (4) est comprise entre 0,1 et 0,2 mm.2) Complex sheet according to claim 1 characterized in that the height of the bosses of the second pattern (4) is between 0.1 and 0.2 mm.
3) Feuille complexe selon la revendication caractérisée en ce que la densité du deuxième motif (4) est comprise entre 20 et 300 bossages au cm2.3) Complex sheet according to claim characterized in that the density of the second pattern (4) is between 20 and 300 bosses per cm 2 .
4) Feuille complexe selon la revendication 2 caractérisée en ce que la densité du deuxième motif (4) est comprise entre 40 et 100 bossage au cm2. 5) Feuille complexe selon la revendication 1, 2 ou 3 caractérisée en ce que le rapport de la densité de deuxième motif (4) à celle du premier motif (3) est supérieur à 2.4) Complex sheet according to claim 2 characterized in that the density of the second pattern (4) is between 40 and 100 boss per cm 2 . 5) Complex sheet according to claim 1, 2 or 3 characterized in that the ratio of the density of the second pattern (4) to that of the first pattern (3) is greater than 2.
6) Feuille complexe selon l'une des revendications précédentes caractérisée en ce que les deux feuilles sont gaufrées et sont liées par les bossages du premier motif (3) selon le mode dit6) Complex sheet according to one of the preceding claims characterized in that the two sheets are embossed and are linked by the bosses of the first pattern (3) according to the said mode
"pointe/pointe"."tip / tip".
7) Feuille complexe selon l'une des revendications 1 à 3 caractérisée en ce que les deux feuilles sont gaufrées et sont liées par les bossages du premier motif sur l'une et les bossages du deuxième motif sur l'autre selon le mode dit "emboîté". 7) Complex sheet according to one of claims 1 to 3 characterized in that the two sheets are embossed and are linked by the bosses of the first pattern on one and the bosses of the second pattern on the other according to the so-called mode " nested ".
EP93902304A 1991-12-09 1992-12-07 Complex sheets of absorbent paper Expired - Lifetime EP0570579B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9115209 1991-12-09
FR9115209A FR2684599B1 (en) 1991-12-09 1991-12-09 COMPLEX SHEET OF ABSORBENT PAPER.
PCT/FR1992/001156 WO1993012293A1 (en) 1991-12-09 1992-12-07 Complex sheets of absorbent paper

Publications (2)

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EP0570579A1 true EP0570579A1 (en) 1993-11-24
EP0570579B1 EP0570579B1 (en) 1998-03-04

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EP93902304A Expired - Lifetime EP0570579B1 (en) 1991-12-09 1992-12-07 Complex sheets of absorbent paper

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US (1) US6287676B1 (en)
EP (1) EP0570579B1 (en)
AT (1) ATE163701T1 (en)
DE (1) DE69224628T2 (en)
DK (1) DK0570579T3 (en)
ES (1) ES2114033T3 (en)
FI (1) FI98946C (en)
FR (1) FR2684599B1 (en)
NO (1) NO301895B1 (en)
WO (1) WO1993012293A1 (en)

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Also Published As

Publication number Publication date
FI933496A (en) 1993-08-06
NO932807D0 (en) 1993-08-06
FI933496A0 (en) 1993-08-06
FI98946B (en) 1997-05-30
FI98946C (en) 1997-09-10
NO301895B1 (en) 1997-12-22
NO932807L (en) 1993-08-06
EP0570579B1 (en) 1998-03-04
WO1993012293A1 (en) 1993-06-24
ES2114033T3 (en) 1998-05-16
FR2684599B1 (en) 1994-01-28
DE69224628D1 (en) 1998-04-09
US6287676B1 (en) 2001-09-11
DE69224628T2 (en) 1998-07-16
ATE163701T1 (en) 1998-03-15
FR2684599A1 (en) 1993-06-11
DK0570579T3 (en) 1998-03-30

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