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EP0446138A1 - Process for making paper for filterbags and product - Google Patents

Process for making paper for filterbags and product Download PDF

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Publication number
EP0446138A1
EP0446138A1 EP91400628A EP91400628A EP0446138A1 EP 0446138 A1 EP0446138 A1 EP 0446138A1 EP 91400628 A EP91400628 A EP 91400628A EP 91400628 A EP91400628 A EP 91400628A EP 0446138 A1 EP0446138 A1 EP 0446138A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
paper
support structure
heated
calendering
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.)
Withdrawn
Application number
EP91400628A
Other languages
German (de)
French (fr)
Inventor
Abel Dambreville
Roger Le Fol
Philippe Deleplanque
Yves Le Brech
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.)
Papeteries de Cascadec
Original Assignee
Papeteries de Cascadec
Bollore Technologies 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
Application filed by Papeteries de Cascadec, Bollore Technologies SA filed Critical Papeteries de Cascadec
Publication of EP0446138A1 publication Critical patent/EP0446138A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D21H27/08—Filter paper
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/005—Mechanical treatment
    • 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
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0738—Cross sectional profile of the embossments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0756—Characteristics of the incoming material, e.g. creped, embossed, corrugated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0758—Characteristics of the embossed product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0758—Characteristics of the embossed product
    • B31F2201/0761—Multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0771—Other aspects of the embossing operations
    • B31F2201/0776—Exchanging embossing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0784—Auxiliary operations
    • 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
    • Y10T428/24496—Foamed or cellular component

Definitions

  • the present invention relates to the preparation of paper for filter bags.
  • filter sachets means infusion sachets, in particular tea or medicinal plant sachets, and coffee or similar sachets.
  • sachet includes the packages delivered in a closed state and filled to the user, as well as the sachets delivered open, for example in the form of a cone, and filled by the consumer, before use.
  • bag is not limited to a particular geometry. It includes, for example, generally cylindrical packaging obtained in the case of products packaged in a compressed state, for example in the case of coffee sachets.
  • the present invention relates more precisely to the preparation of paper for filter bags, of the type formed by a nonwoven structure composed of a layer based on synthetic fibers and a layer of superimposed cellulosic fibers, and having a particular apparent texture, or a repeating pattern such as, for example, a semi-perforation at regular intervals.
  • the texturing operation by fluid jets is most often carried out by projecting the fluid jets 20 onto the paper 12 through a rotary perforated cylinder 22 or a movable perforated strip 120. During this operation, the paper 12 must of course be supported by support means which have not been shown in FIG. 1 to simplify the illustration.
  • the fluid used is generally water. This texturing technique by fluid jets well known to those skilled in the art has given rise to an abundant literature.
  • the hot fixing operation is generally carried out by passing the textured paper over a rotary cylinder 30 provided with heating means.
  • the cylinder 30 can for example be heated to a temperature of the order of 200 ° C. It may possibly be of the "through air" type providing for blowing hot air through the sheet. It can also be replaced by a hot air tunnel oven.
  • the present invention now aims to provide a new process for preparing paper for filter bags which improves the properties of the product obtained.
  • a process for preparing paper for filter bags which comprises, after production according to a technique known per se of a nonwoven paper composed of a layer based on synthetic fibers and a layer of superimposed cellulosic fibers, the step consisting in subjecting the nonwoven paper to a calendering operation between a support structure and a heated relief cylinder.
  • the heated cylinder is a metal cylinder.
  • the support structure is formed by a cylinder with a smooth surface.
  • the support structure is formed of a cylinder having in hollow the relief inverted from that of the metal cylinder.
  • the support structure is formed by a cylinder with an elastic flexible external surface, such as a rubberized cylinder.
  • the support pressure between the support structure and the heated relief cylinder is adjustable.
  • the invention also relates to the device for implementing the method and to the product obtained.
  • the heated relief cylinder 140 is a metal cylinder, while the support structure is formed from a rubberized roller, preferably smooth.
  • the support structure may be formed of a cylinder having in hollow the reverse relief of the cylinder 140.
  • the relief metal roller 140 and the support roller 130 are rotated in the direction of travel of the nonwoven paper 112, at the same speed as the latter.
  • cylinders 130 and 140 could be replaced by structures with equivalent endless belts.
  • the relief cylinder 140 can be heated using any conventional means known to those skilled in the art.
  • the contact pressure between the cylinders 130 and 140 is preferably adjustable.
  • the layer of synthetic fibers of the nonwoven paper 112 is preferably placed on the side of the heated relief cylinder 140.
  • the reverse arrangement can however be adopted, in particular to limit the adhesion between the paper and the heated cylinder, at high speed.
  • the reliefs of the cylinder 140 are found in the appearance of the calendered nonwoven 114.
  • the texturing technique by water jets can also risk perforating the cellulosic layer (as shown in dashes in FIG. 3A), thus creating privileged passages of dust.
  • This drawback is completely eliminated thanks to the process of the invention, which therefore makes it possible to manufacture a filter paper free from the usual drawback of textured papers, in other words a paper having an improved ability to retain the finest particles.
  • the patterns made in relief on the cylinder 140 and reproduced on the paper can be the subject of a very large number of variants.
  • the Applicant in particular has produced papers having patterns in the form of dashes, squares, and diamonds.
  • the width of the reliefs of the cylinder 140 that is to say the width 1 of the compressed areas 116 is of the order of 0.1mm to 5mm, preferably from 0.1mm to 2mm, very preferably of the order of 1mm.
  • the total surface of the compressed areas 116 is less than the 5th, very preferably the 10th of the total surface of the paper.
  • the speed of movement of the paper 112, 114 can be of the order of 200 m / min.
  • composition of the paper can be as follows, cellulosic fibers: wood pulp, hemp, flax, etc., synthetic fibers: polyethylene, PVC, polypropylene, etc.
  • the fibers advantageously have a length of a few mm and a diameter of a few ⁇ m.
  • the thickness of the cellulosic layer is typically of the order of 25 to 40 ⁇ m and the thickness of the synthetic layer is typically of the order of 10 to 15 ⁇ m.
  • the density of the paper can be about 0.3.
  • the raised roller 140 is made of steel. It can be heated by oil circulation, at a temperature of 140 to 300 ° C. The contact pressure between the cylinders can be adjusted between 15 to 45 N / mm in width.
  • an additional heating step similar to known step 30, can be carried out before or after calendering 120. This heating operation is however generally not necessary in the context of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Apparatus For Making Beverages (AREA)
  • Laminated Bodies (AREA)

Abstract

Process for the preparation of paper for filter bags of the type comprising the stage of producing, by a technique known per se, of a nonwoven paper consisting of a layer based on synthetic fibres and of a layer of superposed cellulose fibres, characterised in that it additionally comprises the subsequent stage consisting in subjecting the nonwoven paper (112) to a calendering operation between a supporting structure (130) and a heated embossed roll (140). The invention also relates to a device for using the process and the products thus obtained. <IMAGE>

Description

La présente invention concerne la préparation de papier pour sachets filtres.The present invention relates to the preparation of paper for filter bags.

On entend dans la présente demande par "sachets filtres", les sachets d'infusion, notamment les sachets de thé ou de plantes médicinales, et les sachets de café ou analogues.In the present application, the term “filter sachets” means infusion sachets, in particular tea or medicinal plant sachets, and coffee or similar sachets.

Dans le cadre de la présente demande, le terme "sachet" regroupe les conditionnements livrés à l'état fermé et rempli à l'utilisateur, ainsi que les sachets livrés ouverts, par exemple en forme de cône, et remplis par le consommateur, avant utilisation. Le terme "sachet" n'est pas limité à une géométrie particulière. Il englobe par exemple les conditionnements généralement cylindriques obtenus dans le cas de produits conditionnés à l'état comprimé, par exemple dans le cas de sachets pour café.In the context of this request, the term "sachet" includes the packages delivered in a closed state and filled to the user, as well as the sachets delivered open, for example in the form of a cone, and filled by the consumer, before use. The term "bag" is not limited to a particular geometry. It includes, for example, generally cylindrical packaging obtained in the case of products packaged in a compressed state, for example in the case of coffee sachets.

La présente invention concerne plus précisément la préparation de papier pour sachets filtres, du type formé d'une structure non tissée composée d'une couche à base de fibres synthétiques et d'une couche de fibres cellulosiques superposées, et présentant une texture apparente particulière, ou un motif répétitif tel que, par exemple, une semi-perforation à intervalles réguliers.The present invention relates more precisely to the preparation of paper for filter bags, of the type formed by a nonwoven structure composed of a layer based on synthetic fibers and a layer of superimposed cellulosic fibers, and having a particular apparent texture, or a repeating pattern such as, for example, a semi-perforation at regular intervals.

Comme représenté schématiquement sur la figure 1 annexée, le papier filtre texturé est généralement préparé selon un procédé classique consistant, à réaliser, selon une technique connue en soi à l'aide d'une machine 10, une structure non tissée 12 composée d'une couche à base de fibres synthétiques et d'une couche de fibres cellulosiques superposées, puis à :

  • a) appliquer une série de jets de fluide 20 sur la structure non tissée 12 pour texturer le papier selon une configuration choisie, puis
  • b) soumettre la structure non tissée texturée à une opération de chauffage afin de fixer les fibres synthétiques.
As shown diagrammatically in the appended FIG. 1, the textured filter paper is generally prepared according to a conventional method consisting in producing, according to a technique known per se using a machine 10, a nonwoven structure 12 composed of a layer based on synthetic fibers and a layer of superimposed cellulosic fibers, then to:
  • a) applying a series of jets of fluid 20 to the nonwoven structure 12 to texture the paper in a chosen configuration, then
  • b) subjecting the textured nonwoven structure to a heating operation in order to fix the synthetic fibers.

L'opération de texturage par jets de fluide est le plus souvent réalisée en projetant les jets de fluide 20 sur le papier 12 à travers un cylindre 22 ajouré rotatif ou une bande 120 ajourée mobile. Au cours de cette opération le papier 12 doit bien entendu être supporté par des moyens supports qui n'ont pas été représentés sur la figure 1 pour simplifier l'illustration. Le fluide utilisé est généralement de l'eau. Cette technique de texturation par jets de fluide bien connue de l'homme de l'art a donné lieu à une littérature abondante.The texturing operation by fluid jets is most often carried out by projecting the fluid jets 20 onto the paper 12 through a rotary perforated cylinder 22 or a movable perforated strip 120. During this operation, the paper 12 must of course be supported by support means which have not been shown in FIG. 1 to simplify the illustration. The fluid used is generally water. This texturing technique by fluid jets well known to those skilled in the art has given rise to an abundant literature.

L'opération de fixation à chaud est généralement réalisée par passage du papier texturé sur un cylindre rotatif 30 pourvu de moyens de chauffage. Le cylindre 30 peut par exemple être chauffé à une température de l'ordre de 200°C. Il peut éventuellement être du type "air traversant" prévoyant un soufflage d'air chaud à travers la feuille. Il peut aussi être remplacé par un four-tunnel à air chaud.The hot fixing operation is generally carried out by passing the textured paper over a rotary cylinder 30 provided with heating means. The cylinder 30 can for example be heated to a temperature of the order of 200 ° C. It may possibly be of the "through air" type providing for blowing hot air through the sheet. It can also be replaced by a hot air tunnel oven.

La présente invention a maintenant pour but de proposer un nouveau procédé de préparation de papier pour sachets filtres qui permet d'améliorer les propriétés du produit obtenu.The present invention now aims to provide a new process for preparing paper for filter bags which improves the properties of the product obtained.

Ce but est atteint selon la présente invention grâce à un procédé de préparation de papier pour sachets filtres qui comprend, après réalisation selon une technique connue en soi d'un papier non tissé composé d'une couche à base de fibres synthétiques et d'une couche de fibres cellulosiques superposées, l'étape consistant à soumettre le papier non tissé à une opération de calandrage entre une structure support et un cylindre chauffé à reliefs.This object is achieved according to the present invention by a process for preparing paper for filter bags which comprises, after production according to a technique known per se of a nonwoven paper composed of a layer based on synthetic fibers and a layer of superimposed cellulosic fibers, the step consisting in subjecting the nonwoven paper to a calendering operation between a support structure and a heated relief cylinder.

Selon une caractéristique avantageuse de la présente invention, le cylindre chauffé est un cylindre métallique.According to an advantageous characteristic of the present invention, the heated cylinder is a metal cylinder.

Selon une autre caractéristique avantageuse de l'invention, la structure support est formée d'un cylindre à surface lisse.According to another advantageous characteristic of the invention, the support structure is formed by a cylinder with a smooth surface.

Selon une autre caractéristique avantageuse de l'invention, la structure support est formée d'un cylindre présentant en creux le relief inversé de celui du cylindre métallique.According to another advantageous characteristic of the invention, the support structure is formed of a cylinder having in hollow the relief inverted from that of the metal cylinder.

Selon une autre caractéristique avantageuse de l'invention, la structure support est formée d'un cylindre à surface externe souple élastique, tel qu'un cylindre caoutchouté.According to another advantageous characteristic of the invention, the support structure is formed by a cylinder with an elastic flexible external surface, such as a rubberized cylinder.

Selon une autre caractéristique avantageuse de la présente invention, la pression d'appui entre la structure support et le cylindre chauffé à reliefs est réglable.According to another advantageous characteristic of the present invention, the support pressure between the support structure and the heated relief cylinder is adjustable.

L'invention concerne également le dispositif pour la mise en oeuvre du procédé et le produit obtenu.The invention also relates to the device for implementing the method and to the product obtained.

D'autres caractéristiques, buts et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui va suivre, et en regard des dessins annexés donnés à titre d'exemple non limitatif et sur lesquels :

  • la figure 1 représente une vue schématique d'un procédé classique de préparation de papier pour sachets filtres,
  • la figure 2 représente schématiquement le procédé conforme à la présente invention,
  • les figures 3A et 3B représentent schématiquement en coupe la structure de papier obtenu respectivement par mise en oeuvre du procédé classique représenté sur la figure 1 et du procédé conforme à la présente invention représenté sur la figure 2,
  • les figures 4A et 4B représentent schématiquement deux symboles obtenus respectivement selon la technique classique et selon la présente invention.
Other characteristics, aims and advantages of the present invention will appear on reading the detailed description which follows, and with reference to the appended drawings given by way of nonlimiting example and in which:
  • FIG. 1 represents a schematic view of a conventional process for preparing paper for filter bags,
  • FIG. 2 schematically represents the process according to the present invention,
  • FIGS. 3A and 3B schematically represent in section the structure of paper obtained respectively by implementing the conventional method represented in FIG. 1 and the method in accordance with the present invention represented in FIG. 2,
  • FIGS. 4A and 4B schematically represent two symbols obtained respectively according to the conventional technique and according to the present invention.

Comme représenté sur la figure 2 et indiqué précédemment le procédé conforme à la présente invention consiste :

  • i) à réaliser, selon une technique connue en soi, à l'aide d'une machine classique 100, un papier 112 non tissé composé d'une couche à base de fibres synthétiques et d'une couche de fibres cellulosiques superposées, puis
  • ii) soumettre le papier non tissé 112 à une opération de calandrage 120 entre une structure support 130 et un cylindre chauffé à reliefs 140.
As shown in FIG. 2 and indicated above, the method according to the present invention consists:
  • i) producing, according to a technique known per se, using a conventional machine 100, a nonwoven paper 112 composed of a layer based on synthetic fibers and a layer of superposed cellulosic fibers, then
  • ii) subjecting the nonwoven paper 112 to a calendering operation 120 between a support structure 130 and a heated cylinder with reliefs 140.

De préférence, le cylindre chauffé à reliefs 140 est un cylindre métallique, tandis que la structure support est formée d'un rouleau caoutchouté, lisse de préférence.Preferably, the heated relief cylinder 140 is a metal cylinder, while the support structure is formed from a rubberized roller, preferably smooth.

Le cas échéant, comme indiqué précédemment, la structure support peut être formée d'un cylindre présentant en creux le relief inverse du cylindre 140.Where appropriate, as indicated above, the support structure may be formed of a cylinder having in hollow the reverse relief of the cylinder 140.

Le rouleau métallique à reliefs 140 et le rouleau support 130 sont entraînés à rotation dans le sens de défilement du papier non tissé 112, à la même vitesse que celui-ci.The relief metal roller 140 and the support roller 130 are rotated in the direction of travel of the nonwoven paper 112, at the same speed as the latter.

Bien entendu, le cas échéant, les cylindres 130 et 140 pourraient être remplacés par des structures à bandes sans fin equivalentes.Of course, if necessary, the cylinders 130 and 140 could be replaced by structures with equivalent endless belts.

Le cylindre à reliefs 140 peut être chauffé à l'aide de tout moyen classique connu de l'homme de l'art.The relief cylinder 140 can be heated using any conventional means known to those skilled in the art.

La pression d'appui entre les cylindres 130 et 140 est de préférence réglable.The contact pressure between the cylinders 130 and 140 is preferably adjustable.

La couche de fibres synthétiques du papier non tissé 112 est de préférence placée du côté du cylindre chauffé à reliefs 140. La disposition inverse peut cependant être retenue, en particulier pour limiter l'adhérence entre le papier et le cylindre chauffé, à grande vitesse.The layer of synthetic fibers of the nonwoven paper 112 is preferably placed on the side of the heated relief cylinder 140. The reverse arrangement can however be adopted, in particular to limit the adhesion between the paper and the heated cylinder, at high speed.

Ainsi, lors du passage entre les rouleaux 130 et 140, les fibres synthétiques du non tissé 112 sont en partie fondues par l'action de calandrage qui s'exerce au niveau des reliefs du cylindre 140.Thus, during the passage between the rollers 130 and 140, the synthetic fibers of the nonwoven 112 are partly melted by the calendering action which is exerted at the level of the reliefs of the cylinder 140.

De ce fait on retrouve après passage entre les cylindres 130 et 140, dans l'aspect du non tissé calandré 114, les reliefs du cylindre 140.Therefore, after passing between the cylinders 130 and 140, the reliefs of the cylinder 140 are found in the appearance of the calendered nonwoven 114.

Le procédé proposé dans le cadre de la présente invention offre de nombreux avantages par rapport au procédé classique antérieur illustré sur la figure 1.The method proposed in the context of the present invention offers numerous advantages compared to the prior conventional method illustrated in FIG. 1.

Parmi les avantages on citera les suivants.

  • a) Le procédé conforme à la présente invention requiert un seul poste de traitement en aval de l'appareil 100 générant le papier non tissé bi-couche 112, alors que le procédé connu représenté sur la figure 1 requiert deux postes de traitement correspondant respectivement au poste de texturation par jets d'eau et au poste de chauffage pour la fixation des fibres synthétiques. Il en résulte que les chaînes de fabrication conformes à la présente invention présentent un encombrement plus faible et sont plus faciles à régler. En particulier, on supprime la nécessité de synchronisation de vitesse entre les deux postes de traitement séparés de la technique antérieure.
  • b) Le procédé conforme à la présente invention ne consomme plus d'eau pour la texturation du papier.
  • c) Le procédé conforme à la présente invention supprime le réglage du débit d'eau difficile à contrôler.
  • d) Les dessins correspondant aux reliefs du cylindre 140 obtenus selon l'invention, présentent une plus grande netteté que les dessins texturés par jets d'eau selon la technique classique antérieure.
  • e) Le procédé conforme à la présente invention permet une plus grande variété de motifs que la technique classique antérieure. La configuration et la dimension des motifs obtenus selon la technique antérieure sont limitées par le taux d'ouverture du cylindre perforé 22. Par ailleurs, la technique classique de texturation par jets d'eau à travers un cylindre ajouré 22 interdit la réalisation de figures fermées.
    Par exemple la technique classique ne permet pas de réaliser la lettre "O" sous forme d'un symbole fermé, continu. Selon la technique classique la lettre "O" devait être réalisée sous forme de différents segments séparés S1, S2, S3, S4 comme représenté schématiquement sur la figure 4A.
    La présente invention permet par contre sans difficulté de telles figures fermées, comme représenté sur la figure 4B.
  • f) La présente invention permet de transformer rapidement une chaîne de fabrication générant un motif donné sur le papier en une chaîne donnant un autre motif, par simple changement du cylindre en relief 140, alors que selon la technique classique antérieure, le changement d'un cylindre 22 exige des réglages délicats, en particulier quant au débit de fluide en fonction de la dimension des perforations du cylindre.
    De ce fait, le procédé conforme à la présente invention permet une meilleure régularité, ainsi qu'une meilleure reproductibilité du papier obtenu, d'une campagne de fabrication à une autre.
  • g) Enfin et surtout alors que comme représenté sur la figure 3A, la texturation par jets d'eau classique induit un déplacement des fibres donc des perforations localisées 16 dans la couche synthétique, le procédé de texturation par calandrage proposé par l'invention induit seulement des compressions localisées 116 dans la couche de fibres synthétiques.
Among the advantages are the following.
  • a) The method according to the present invention requires a single processing station downstream of the apparatus 100 generating the bi-layer nonwoven paper 112, while the known method shown in FIG. 1 requires two processing stations corresponding respectively to the texturing station with water jets and heating station for fixing synthetic fibers. As a result, the production lines according to the present invention have a smaller footprint and are easier to adjust. In particular, the need for speed synchronization between the two separate processing stations of the prior art is eliminated.
  • b) The process according to the present invention no longer consumes water for texturing the paper.
  • c) The method according to the present invention eliminates the adjustment of the water flow which is difficult to control.
  • d) The drawings corresponding to the reliefs of the cylinder 140 obtained according to the invention have greater clarity than the textured drawings by water jets according to the prior conventional technique.
  • e) The process according to the present invention allows a greater variety of patterns than the prior conventional technique. The configuration and dimension of the patterns obtained according to the prior art are limited by the opening rate of the perforated cylinder 22. Furthermore, the conventional technique of texturing by water jets through an openwork cylinder 22 prohibits the production of closed figures.
    For example, the conventional technique does not allow the letter "O" to be produced in the form of a closed, continuous symbol. According to the conventional technique, the letter "O" had to be produced in the form of different separate segments S1, S2, S3, S4 as shown diagrammatically in FIG. 4A.
    The present invention however allows without difficulty such closed figures, as shown in Figure 4B.
  • f) The present invention makes it possible to quickly transform a production line generating a given pattern on paper into a chain giving another pattern, by simple change of the relief cylinder 140, whereas according to the prior conventional technique, the change of a cylinder 22 requires delicate adjustments, in particular as regards the flow of fluid as a function of the size of the perforations of the cylinder.
    Therefore, the process according to the present invention allows better regularity, as well as better reproducibility of the paper obtained, from one production campaign to another.
  • g) Finally and above all while as shown in FIG. 3A, texturing by conventional water jets induces a displacement of the fibers, therefore localized perforations 16 in the synthetic layer, the calendering texturing process proposed by the invention only induces localized compressions 116 in the layer of synthetic fibers.

La technique de texturation par jets d'eau peut risquer de perforer également la couche cellulosique (comme représenté en tirets sur la figure 3A) donc de créer des passages privilégiés de poussière. Cet inconvénient est totalement éliminé grâce au procédé de l'invention, qui permet donc de fabriquer un papier filtre exempt de l'inconvénient habituel des papiers texturés, en d'autres termes un papier présentant une aptitude améliorée à retenir les particules les plus fines.The texturing technique by water jets can also risk perforating the cellulosic layer (as shown in dashes in FIG. 3A), thus creating privileged passages of dust. This drawback is completely eliminated thanks to the process of the invention, which therefore makes it possible to manufacture a filter paper free from the usual drawback of textured papers, in other words a paper having an improved ability to retain the finest particles.

Les motifs réalisés en relief sur le cylindre 140 et reproduits sur le papier peuvent faire l'objet d'un très grand nombre de variantes.The patterns made in relief on the cylinder 140 and reproduced on the paper can be the subject of a very large number of variants.

La demanderesse en particulier a réalisé des papiers présentant des motifs sous forme de tirets, de carrés, et de losanges.The Applicant in particular has produced papers having patterns in the form of dashes, squares, and diamonds.

Selon une caractéristique avantageuse de la présente invention la largeur des reliefs du cylindre 140, c'est-à-dire la largeur 1 des zones 116 comprimées est de l'ordre de 0,1mm à 5mm, préférentiellement de 0,1mm à 2mm, très préférentiellement de l'ordre de 1mm.According to an advantageous characteristic of the present invention, the width of the reliefs of the cylinder 140, that is to say the width 1 of the compressed areas 116 is of the order of 0.1mm to 5mm, preferably from 0.1mm to 2mm, very preferably of the order of 1mm.

Selon une autre caractéristique avantageuse de la présente invention, la surface totale des zones comprimées 116 est inférieure au 5ème, très préférentiellement au 10ème de la surface totale du papier.According to another advantageous characteristic of the present invention, the total surface of the compressed areas 116 is less than the 5th, very preferably the 10th of the total surface of the paper.

La vitesse de défilement du papier 112, 114 peut être de l'ordre de 200m/mn.The speed of movement of the paper 112, 114 can be of the order of 200 m / min.

La composition du papier peut être la suivante, fibres cellulosiques : pâte de bois, de chanvre, de lin, etc ..., fibres synthétiques : polyethylène, PVC, polypropylène, etc.The composition of the paper can be as follows, cellulosic fibers: wood pulp, hemp, flax, etc., synthetic fibers: polyethylene, PVC, polypropylene, etc.

Les fibres ont avantageusement une longueur de quelques mm et un diamètre de quelques µm.The fibers advantageously have a length of a few mm and a diameter of a few µm.

L'épaisseur de la couche cellulosique est typiquement de l'ordre de 25 à 40 µm et l'épaisseur de la couche synthétique est typiquement de l'ordre de 10 à 15 µm.The thickness of the cellulosic layer is typically of the order of 25 to 40 μm and the thickness of the synthetic layer is typically of the order of 10 to 15 μm.

La densité du papier peut être d'environ 0,3.The density of the paper can be about 0.3.

Selon un mode de réalisation particulier, le rouleau en relief 140 est en acier. Il peut être chauffé par circulation d'huile, à une température de 140 à 300°C. La pression d'appui entre les cylindres peut être réglée entre 15 à 45 N/mm de largeur.According to a particular embodiment, the raised roller 140 is made of steel. It can be heated by oil circulation, at a temperature of 140 to 300 ° C. The contact pressure between the cylinders can be adjusted between 15 to 45 N / mm in width.

Le cas échéant une étape supplémentaire de chauffage, similaire à l'étape 30 connue, peut être réalisée avant ou après le calandrage 120. Cette opération de chauffage n'est cependant généralement pas nécessaire dans le cadre de l'invention.If necessary, an additional heating step, similar to known step 30, can be carried out before or after calendering 120. This heating operation is however generally not necessary in the context of the invention.

Bien entendu la présente invention n'est pas limitée au mode de réalisation particulier qui vient d'être décrit mais s'étend à toutes variantes conformes à son esprit.Of course the present invention is not limited to the particular embodiment which has just been described but extends to all variants in accordance with its spirit.

Claims (17)

Procédé de préparation de papier pour sachets filtres du type comprenant l'étape de réalisation, selon une technique connue en soi, d'un papier non tissé composé d'une couche à base de fibres synthétiques et d'une couche de fibres cellulosiques superposées, caractérisé par le fait qu'il comprend en outre l'étape ultérieure consistant à soumettre le papier non tissé (112) à une opération de calandrage entre une structure support (130) et un cylindre chauffé à reliefs (140).Process for preparing paper for filter bags of the type comprising the step of producing, according to a technique known per se, a nonwoven paper composed of a layer based on synthetic fibers and a layer of superimposed cellulosic fibers characterized in that it further comprises the subsequent step of subjecting the nonwoven paper (112) to a calendering operation between a support structure (130) and a heated relief cylinder (140). Procédé selon la revendication 1, caractérisé par le fait qu'au cours de l'opération de calandrage, la couche de fibres synthétiques est adjacente au rouleau chauffé à reliefs (140).Method according to claim 1, characterized in that during the calendering operation, the layer of synthetic fibers is adjacent to the heated relief roller (140). Procédé selon l'une des revendications 1 à 2, caractérisé par le fait que le cylindre chauffé à reliefs (140) est métallique.Method according to one of claims 1 to 2, characterized in that the heated relief cylinder (140) is metallic. Procédé selon l'une des revendications 1 à 3, caractérisé par le fait que la structure support (130) est formée d'un cylindre lisse (130) de préférence d'un cylindre caoutchouté.Method according to one of claims 1 to 3, characterized in that the support structure (130) is formed by a smooth cylinder (130) preferably a rubberized cylinder. Dispositif pour la mise en oeuvre du procédé conforme à l'une des revendications 1 à 4, caractérisé par le fait qu'il comprend : - des moyens de réalisation, connus en eux-mêmes, d'un papier non tissé composé d'une couche à base de fibres synthétiques et d'une couche de fibres cellulosiques superposées (112), et - un poste de calandrage du papier non tissé ainsi formé, comprenant une structure support (130) et un cylindre chauffé à reliefs (140). Device for implementing the method according to one of claims 1 to 4, characterized in that it comprises: - means for making, known in themselves, a nonwoven paper composed of a layer based on synthetic fibers and a layer of superposed cellulosic fibers (112), and a station for calendering the nonwoven paper thus formed, comprising a support structure (130) and a heated cylinder with reliefs (140). Dispositif selon la revendication 5, caractérisé par le fait que le cylindre chauffé à reliefs (140) est un cylindre métallique.Device according to claim 5, characterized in that the heated relief cylinder (140) is a metal cylinder. Dispositif selon l'une des revendications 5 ou 6, caractérisé par le fait que la structure support (130) est formée d'un cylindre lisse.Device according to one of claims 5 or 6, characterized in that the support structure (130) is formed by a smooth cylinder. Dispositif selon l'une des revendications 5 ou 6, caractérisé par le fait que la structure support (130) est formée d'un cylindre présentant en creux le relief inversé de celui du cylindre chauffé.Device according to one of claims 5 or 6, characterized in that the support structure (130) is formed by a cylinder having in hollow the relief inverted from that of the heated cylinder. Dispositif selon l'une des revendications 5 à 8, caractérisé par le fait que la structure support (130) comprend une surface souple et élastique.Device according to one of claims 5 to 8, characterized in that the support structure (130) comprises a flexible and elastic surface. Dispositif selon l'une des revendications 5 à 9, caractérisé par le fait que la structure support (130) est formée d'un cylindre caoutchouté.Device according to one of Claims 5 to 9, characterized in that the support structure (130) is formed by a rubberized cylinder. Dispositif selon l'une des revendications 5 à 10, caractérisé par le fait que les moyens de calandrage comprennent des moyens de réglage de la pression entre la structure support (130) et le cylindre chauffé à reliefs (140).Device according to one of claims 5 to 10, characterized in that the calendering means comprise means for adjusting the pressure between the support structure (130) and the heated relief cylinder (140). Dispositif selon l'une des revendications 5 à 10, caractérisé par le fait que la pression entre la structure support (130) et le cylindre chauffé à reliefs (140) est réglable entre 15 et 45 N/mm de largeur.Device according to one of Claims 5 to 10, characterized in that the pressure between the support structure (130) and the heated relief cylinder (140) is adjustable between 15 and 45 N / mm in width. Dispositif selon l'une des revendications 5 à 12, caractérisé par le fait que la température du cylindre chauffé en reliefs (140) est de l'ordre de 140 à 300°C.Device according to one of Claims 5 to 12, characterized in that the temperature of the heated cylinder in reliefs (140) is of the order of 140 to 300 ° C. Papier non tissé obtenu par la mise en oeuvre du procédé conforme à l'une des revendications 1 à 4 et/ou à l'aide du dispositif conforme à l'une des revendications 5 à 13.Nonwoven paper obtained by implementing the method according to one of claims 1 to 4 and / or using the device according to one of claims 5 to 13. Papier conforme à la revendication 14, caractérisé par le fait que les reliefs formés par les moyens de calandrage sont de contour fermé.Paper according to claim 14, characterized in that the reliefs formed by the calendering means are of closed contour. Papier selon l'une des revendications 14 ou 15, caractérisé par le fait que la largeur des zones de fibres synthétiques comprimées au cours de l'opération de calandrage est comprise entre 0,1mm et 5mm préférentiellement entre 0,1mm et 2mm.Paper according to one of claims 14 or 15, characterized in that the width of the areas of synthetic fibers compressed during the calendering operation is between 0.1mm and 5mm, preferably between 0.1mm and 2mm. Papier selon l'une des revendications 14 à 16, caractérisé par le fait que la largeur des zones de fibres synthétiques comprimées au cours de l'opération de calandrage est de l'ordre de 1mm.Paper according to one of claims 14 to 16, characterized in that the width of the areas of synthetic fibers compressed during the calendering operation is of the order of 1mm.
EP91400628A 1990-03-08 1991-03-07 Process for making paper for filterbags and product Withdrawn EP0446138A1 (en)

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FR9002959A FR2659364B1 (en) 1990-03-08 1990-03-08 PROCESS FOR PREPARING PAPER FOR FILTERED BAGS, APPARATUS FOR IMPLEMENTING THE PROCESS AND PRODUCT OBTAINED.
FR9002959 1990-03-08

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EP1027499A1 (en) * 1997-10-31 2000-08-16 Dexter Corporation Heat seal infusion web material and method of manufacture
EP1229166A1 (en) * 2001-01-31 2002-08-07 MELITTA HAUSHALTSPRODUKTE GmbH & Co. Kommanditgesellschaft Process for making filter paper
US6824647B2 (en) * 2002-05-14 2004-11-30 Georgia-Pacific France Method for marking a sheet of paper and sheet with a watermark
EP1696076A1 (en) * 2005-02-23 2006-08-30 J R Crompton Ltd. Beverage package
CN104760334A (en) * 2015-04-22 2015-07-08 浙江中烟工业有限责任公司 Cellulosic paper groove compression roller drive and driven roller pair device

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EP2077353A1 (en) * 1997-10-31 2009-07-08 Ahlstrom Windsor Locks LLC Heat seal infusion web material
EP1229166A1 (en) * 2001-01-31 2002-08-07 MELITTA HAUSHALTSPRODUKTE GmbH & Co. Kommanditgesellschaft Process for making filter paper
US6824647B2 (en) * 2002-05-14 2004-11-30 Georgia-Pacific France Method for marking a sheet of paper and sheet with a watermark
EP1696076A1 (en) * 2005-02-23 2006-08-30 J R Crompton Ltd. Beverage package
CN104760334A (en) * 2015-04-22 2015-07-08 浙江中烟工业有限责任公司 Cellulosic paper groove compression roller drive and driven roller pair device

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JPH0754299A (en) 1995-02-28

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