FR2759389A1 - Production of absorbent material, used in nappies and sanitary towels - Google Patents

Production of absorbent material, used in nappies and sanitary towels Download PDF

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Publication number
FR2759389A1
FR2759389A1 FR9701780A FR9701780A FR2759389A1 FR 2759389 A1 FR2759389 A1 FR 2759389A1 FR 9701780 A FR9701780 A FR 9701780A FR 9701780 A FR9701780 A FR 9701780A FR 2759389 A1 FR2759389 A1 FR 2759389A1
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France
Prior art keywords
film
fibers
perforations
perforated
face
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Granted
Application number
FR9701780A
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French (fr)
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FR2759389B1 (en
Inventor
Bernard Bezier
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GUIAL
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GUIAL
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51474—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure
    • A61F13/51478—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure being a laminate, e.g. multi-layered or with several layers
    • A61F13/5148—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure being a laminate, e.g. multi-layered or with several layers having an impervious inner layer and a cloth-like outer layer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51456—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties
    • A61F13/51458—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties being air-pervious or breathable
    • A61F13/5146—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties being air-pervious or breathable having apertures of perforations
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/593—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives to layered webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/736—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged characterised by the apparatus for arranging fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00—Other non-woven fabrics

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Epidemiology (AREA)
  • Biomedical Technology (AREA)
  • Dermatology (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

To produce a flat material of a perforated film (1), covered by a fibre layer on at least one surface (1-a), the surface (1-a) is initially coated with an adhesive (3-a). The short fibres (9) are applied to the film surface (1-a) by an air stream through the film (1) so that the fibres lie on the film without blocking the perforations. Preferably the fibres (9) have a length of at most five times the smallest perforation diameter at the plane of the film contact surface (1-a). The adhesive is applied at a rate of 1-5 g/m<2>.

Description

PROCEDE DE FABRICATION D'UN MATERIAU PLAN COMPOSITE
COMPORTANT UNE COUCHE DE FIBRES LIEES AU MOYEN D'UN
ADHESIF A UN FILM PERFORE ET NE COUVRANT PAS LES
PERFORATIONS DU FILM
La présente invention a pour principal objet un procédé de fabrication d'un matériau plan composite comportant une couche de fibres liées à un film perforé, et ne couvrant pas les perforations du film. Elle concerne également le matériau plan composite en tant que tel ainsi que son utilisation comme film respirable dans la fabrication d'articles d'hygiène absorbants tels que par exemple les couches-culottes et les protections féminines.PROCESS FOR MANUFACTURING A COMPOSITE FLAT MATERIAL
CONTAINING A LAYER OF BOUND FIBERS BY MEANS OF A
ADHESIVE TO A PERFORATED FILM AND NOT COVERING THE
FILM PERFORATIONS
The main object of the present invention is a process for manufacturing a flat composite material comprising a layer of fibers bonded to a perforated film, and not covering the perforations of the film. It also relates to the flat composite material as such as well as its use as a breathable film in the manufacture of absorbent hygiene articles such as, for example, diapers and feminine protections.

Dans la demande de brevet internationale WO 94/24354, on a déjà proposé un matériau plan composite comportant un film perforé thermoplastique recouvert sur au moins une de ses faces d'une couche de fibres thermoplastiques. In international patent application WO 94/24354, a flat composite material has already been proposed comprising a perforated thermoplastic film covered on at least one of its faces with a layer of thermoplastic fibers.

Ce matériau plan composite est destiné à être utilisé comme support de coussin absorbant dans la fabrication de couches-culottes, ou encore comme film entourant le coussin absorbant dans la fabrication de protection féminine. Lorsqu'il est utilisé comme support de coussin absorbant dans le domaine des couches-culottes, ce matériau plan composite est imperméable aux liquides, et fait ainsi office de barrière pour l'urine, et perméable à l'air et à la vapeur d'eau, ce qui permet un échange gazeux entre l'article absorbant et l'extérieur de la couche-culotte. On obtient ainsi une évacuation progressive, sous forme de vapeur d'eau, de l'urine contenue dans le matelas absorbant, ce qui permet d'éviter l'apparition de rougeurs et voir même d'allergie, qui seraient provoquées par la macération de l'urine au contact de la peau de l'utilisateur. Lorsqu'il est utilisé comme film entourant le coussin absorbant d'un article de protection féminine, le matériau plan composite permet le passage des pertes sanguines, tout en évitant leur reflux. Dans cette application, la face textile, c'est-à-dire celle correspondant à la couche fibreuse est celle destinée à venir en contact avec l'usager, et présente avantageusement un toucher plus agréable comparativement au toucher d'un simple film thermoplastique perforé.This flat composite material is intended for use as an absorbent pad support in the manufacture of diapers, or as a film surrounding the absorbent pad in the manufacture of feminine protection. When used as an absorbent pad backing in the diaper field, this flat composite material is impermeable to liquids, and thus acts as a barrier for urine, and permeable to air and vapor. water, which allows gas exchange between the absorbent article and the exterior of the diaper. This results in a gradual evacuation, in the form of water vapor, of the urine contained in the absorbent mattress, which prevents the appearance of redness and even allergy, which would be caused by the maceration of urine in contact with the user's skin. When used as a film surrounding the absorbent pad of a feminine protective article, the flat composite material allows the passage of blood loss while preventing its backflow. In this application, the textile face, that is to say that corresponding to the fibrous layer, is that intended to come into contact with the user, and advantageously has a more pleasant feel compared to the feel of a simple perforated thermoplastic film. .

Dans la demande de brevet internationale WO 94/24354, le film perforé est un film thermoplastique, et les fibres sont nécessairement en majorité constituées de fibres thermoplastiques, la liaison entre les fibres et le film étant nécessairement réalisée par thermoliage, et éventuellement au moyen d'une colle en complément du thermoliage. Plus précisément, dans un premier procédé, on disperse une nappe de fibres majoritairement thermoplastiques sur un film thermoplastique non perforé, et on présente l'ensemble ainsi constitué sur une surface pourvue d'orifices, puis on chauffe cet ensemble à une température proche de la température de ramollissement des matières thermoplastiques, tout en créant une aspiration à travers les orifices en sorte d'obtenir le claquage du film. Dans un second procédé, on disperse une nappe de fibres thermoplastiques sur un film thermoplastique déjà perforé, alors que les fibres sont à une température suffisante pour qu'elles adhérent naturellement à la surface du film après refroidissement de celui-ci. Enfin, dans un troisième procédé, on extrude un film thermoplastique sur un non-tissé constitué de fibres majoritairement thermoplastiques, et on réalise le claquage du film de la même manière que pour le premier procédé. In international patent application WO 94/24354, the perforated film is a thermoplastic film, and the fibers necessarily consist mainly of thermoplastic fibers, the bond between the fibers and the film being necessarily carried out by thermobonding, and optionally by means of 'an adhesive in addition to thermobonding. More precisely, in a first process, a sheet of predominantly thermoplastic fibers is dispersed on a non-perforated thermoplastic film, and the assembly thus formed is presented on a surface provided with orifices, then this assembly is heated to a temperature close to softening temperature of the thermoplastics, while creating a suction through the orifices so as to obtain the breakdown of the film. In a second process, a web of thermoplastic fibers is dispersed on an already perforated thermoplastic film, while the fibers are at a temperature sufficient for them to adhere naturally to the surface of the film after cooling thereof. Finally, in a third process, a thermoplastic film is extruded on a nonwoven consisting of predominantly thermoplastic fibers, and the film is broken down in the same way as for the first process.

Le matériau plan composite obtenu par la mise en oeuvre des procédés ci-dessus a l'inconvénient de présenter des perforations qui sont recouvertes en tout ou partie par les fibres de la couche fibreuse. Les fibres au droit des perforations font donc obstacle à l'échange gazeux lorsque ce matériau est utilisé comme matériau support de coussin absorbant dans une couche-culotte, ou font obstacle au passage des pertes sanguines lorsque le matériau plan composite est utilisé comme film entourant le coussin absorbant d'une protection féminine. The flat composite material obtained by implementing the above processes has the drawback of having perforations which are covered in whole or in part by the fibers of the fibrous layer. The fibers in line with the perforations therefore obstruct gas exchange when this material is used as a support material for an absorbent pad in a diaper, or obstruct the passage of blood loss when the flat composite material is used as a film surrounding the diaper. absorbent cushion with feminine protection.

Le but principal de la présente invention est de proposer un nouveau procédé de fabrication d'un matériau plan composite comportant un film perforé recouvert d'une couche fibreuse sur au moins une face, dite face de contact, qui permet de pallier l'inconvénient ci-dessus, tout en conservant les avantages de l'utilisation d'un film perforé quant aux performances techniques et un toucher réellement textile lié à la couche fibreuse
Selon l'invention, ce procédé consiste à enduire préalablement la face de contact du film perforé avec une colle, et à projeter des fibres courtes sur la face de contact du film, en mettant en oeuvre une aspiration à travers le film perforé de telle sorte que les fibres projetées au droit des perforations du film sont aspirées à travers le film perforé et ne viennent pas obstruer les perforations.The main aim of the present invention is to provide a new method of manufacturing a flat composite material comprising a perforated film covered with a fibrous layer on at least one face, called the contact face, which makes it possible to overcome the disadvantage above. above, while retaining the advantages of using a perforated film in terms of technical performance and a truly textile feel linked to the fibrous layer
According to the invention, this method consists in coating the contact face of the perforated film beforehand with an adhesive, and in projecting short fibers on the contact face of the film, by implementing a suction through the perforated film in such a way. that the fibers projected in line with the perforations of the film are sucked through the perforated film and do not obstruct the perforations.

Pour la mise en oeuvre du procédé de l'invention, la longueur des fibres devra être suffisamment faible par rapport aux dimensions des perforations du film perforé pour éviter qu'une fibre arrivant au droit d'une perforation ne soit retenue par ses deux extrémités de par et d'autre de la perforation par l'adhésif enduit sur la face du film perforé. Cette longueur maximale des fibres utilisées dépendra non seulement de la dimension des perforations, mais également de la force d'aspiration mise en oeuvre ainsi que du type et de la quantité d'adhésif utilisés. Il a néanmoins été mis en évidence que pour une longueur de fibres supérieure à cinq fois la plus petite dimension de perforation dans le plan de la face de contact du film, il devenait difficile, même en augmentant la force d'aspiration, d'éviter que les fibres au droit d'une perforation ne restent attachées au film par leurs deux extrémités. For the implementation of the method of the invention, the length of the fibers must be sufficiently short compared to the dimensions of the perforations of the perforated film to prevent a fiber arriving at the level of a perforation from being retained by its two ends of the perforation. either side of the perforation by the adhesive coated on the face of the perforated film. This maximum length of fibers used will depend not only on the size of the perforations, but also on the suction force used as well as the type and amount of adhesive used. It was nevertheless demonstrated that for a length of fibers greater than five times the smallest dimension of perforation in the plane of the contact face of the film, it became difficult, even by increasing the suction force, to avoid that the fibers at the right of a perforation do not remain attached to the film by their two ends.

L'invention a pour autre objet un matériau plan composite comportant un film perforé recouvert d'une couche de fibres sur au moins une face de contact, et qui se caractérise en ce que les fibres sont liées à la face de contact du film perforé uniquement au moyen d'une colle, en ce que la longueur des fibres est inférieure ou égale à cinq fois la plus petite dimension des perforations dans le plan de la face de contact du film, et en ce que les perforations du film ne sont pas recouvertes de fibres. Another subject of the invention is a flat composite material comprising a perforated film covered with a layer of fibers on at least one contact face, and which is characterized in that the fibers are bonded to the contact face of the perforated film only. by means of an adhesive, in that the length of the fibers is less than or equal to five times the smallest dimension of the perforations in the plane of the contact face of the film, and in that the perforations of the film are not covered fiber.

D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante d'un exemple particulier de mise en oeuvre du procédé de l'invention, laquelle description est donnée à titre d'exemple non limitatif, et en référence aux dessins annexés sur lesquels - la figure l représente de manière schématique une installation pour la mise en oeuvre de procédé de l'invention, - la figure 2 est une représentation en coupe d'un exemple particulier de matériau plan composite à trois dimensions conforme à l'invention, - la figure 3 est une représentation schématique en coupe d'un matériau plan composite qui est obtenu lorsque l'on met en oeuvre le procédé de l'invention avec une longueur de fibres trop importante, - et la figure 4 est une vue schématique de dessus d'un film perforé pouvant être utilisé pour réaliser les matériaux plan composite de l'invention et comportant des perforations se présentant sous la forme de cratères avec un rétrécissement, ou sous la forme de cercles. Other characteristics and advantages of the invention will emerge more clearly on reading the following description of a particular example of implementation of the method of the invention, which description is given by way of non-limiting example, and in reference to the appended drawings in which - figure 1 shows schematically an installation for implementing the method of the invention, - figure 2 is a cross-sectional representation of a particular example of a three-dimensional composite plane material conforming to to the invention, - Figure 3 is a schematic sectional representation of a planar composite material which is obtained when the method of the invention is implemented with too great a length of fibers, - and Figure 4 is a schematic top view of a perforated film that can be used to make the composite planar materials of the invention and comprising perforations in the form of craters with a narrowing ement, or in the form of circles.

Si l'on se référe à l'installation de la figure 1, dans une variante particulière de réalisation le matériau plan composite de l'invention est obtenu à partir d'un film perforé 1, qui est déroulé en continu depuis un rouleau alimentaire 2a et enroulé sur un rouleau de stockage 2b. S'agissant d'un matériau composite destiné à être utilisé comme film respirable dans le domaine de fabrication des couches-culottes ou des protections féminines, le film perforé 1 sera de préférence un film thermoplastique, et par exemple un film en polyéthylène, polyamide ou polypropylène. Ce film 1 aura été préalablement perforé par tout moyen connu de l'homme du métier. Dans le cadre de l'invention, il pourra s'agir aussi bien d'un film perforé à deux dimensions, c'est-à-dire dont les perforations sont réalisées dans l'épaisseur du film et ne font pas saillie par rapport à l'une ou l'autre des deux faces, ou bien d'un film à trois dimensions c'est-à-dire d'un film présentant une face lisse, et une face rugueuse comportant des cratères. If we refer to the installation of Figure 1, in a particular variant embodiment the composite planar material of the invention is obtained from a perforated film 1, which is unwound continuously from a food roll 2a and wound up on a storage roll 2b. As regards a composite material intended to be used as a breathable film in the field of manufacturing diapers or feminine protections, the perforated film 1 will preferably be a thermoplastic film, and for example a film made of polyethylene, polyamide or polypropylene. This film 1 will have been perforated beforehand by any means known to those skilled in the art. In the context of the invention, it could equally well be a two-dimensional perforated film, that is to say the perforations of which are made in the thickness of the film and do not protrude from the film. one or the other of the two faces, or else of a three-dimensional film, that is to say of a film having a smooth face, and a rough face comprising craters.

Entre les deux rouleaux 2a et 26, le film perforé 1 passe sous une station d'enduction 3, et sous une station 4 de formation par aspiration de la couche fibreuse. Between the two rollers 2a and 26, the perforated film 1 passes under a coating station 3, and under a station 4 for forming the fibrous layer by suction.

La station d'enduction 3 permet d'enduire en continu la face la, dite par la suite face de contact du film perforé 1, sur toute la largeur du film, au moyen d'une colle 3a. Une telle station d'enduction est par ailleurs déjà connue. La colle sera par exemple une résine adhésive thermoplastique dont l'enduction est réalisée selon la technique MELT-BLOWN, ou au moyen d'une buse léchante s'étendant sur toute la largeur du film 1. The coating station 3 makes it possible to continuously coat the face 1a, hereinafter called the contact face of the perforated film 1, over the entire width of the film, by means of an adhesive 3a. Such a coating station is moreover already known. The glue will for example be a thermoplastic adhesive resin, the coating of which is carried out according to the MELT-BLOWN technique, or by means of a licking nozzle extending over the entire width of the film 1.

La station 4 de formation par aspiration de la couche fibreuse est une station qui est couramment utilisée pour la formation par voie sèche de non-tissés. The fibrous layer suction forming station 4 is a station which is commonly used for the dry forming of nonwovens.

Sa structure étant connue, elle ne sera pas décrite en détails. Cette station 4 comporte un transporteur 5 dont la bande 5a est perméable à l'air. Cette bande 5a présente une portion rectiligne 56 servant de support au film perforé l, la face lb du film l qui n'est pas enduite de colle étant tournée vers la bande 5a.Its structure being known, it will not be described in detail. This station 4 comprises a conveyor 5, the band 5a of which is permeable to air. This strip 5a has a rectilinear portion 56 serving as a support for the perforated film 1, the face lb of the film 1 which is not coated with adhesive being turned towards the strip 5a.

Un caisson d'aspiration 6 est disposé au dessous de la portion rectiligne 56 de la bande 5a du transporteur 5. Ce caisson permet de créer un flux d'aspiration à travers la partie rectiligne 5b de la bande 5 et le film perforé 1, selon une surface d'aspiration (S) qui s'étend sur une longueur (~) et sur une largeur correspondant à la largeur du film perforé 1. A suction box 6 is disposed below the rectilinear portion 56 of the strip 5a of the conveyor 5. This box makes it possible to create a suction flow through the rectilinear part 5b of the strip 5 and the perforated film 1, according to a suction surface (S) which extends over a length (~) and over a width corresponding to the width of the perforated film 1.

Au dessus de la surface d'aspiration (S) la station 4 comporte un caisson 7 d'alimentation en fibres, qui permet d'alimenter de manière homogène toute la surface d'aspiration (S1 en fibres 9. Ce caisson qui est par ailleurs déjà connu met par exemple en oeuvre deux tambours rotatifs perforés 7a, 7b de distribution des fibres. Ces deux tambours sont alimentés par voie pneumatique avec des fibres 9 issues d'une machine 8 de production de fibres coupées de faible longueur. La nature des fibres dépendra de l'application ultérieure du matériau plan composite. Above the suction surface (S), station 4 comprises a fiber supply box 7, which makes it possible to supply the entire suction surface (S1 with fibers 9) in a homogeneous manner. already known, for example, uses two perforated rotary drums 7a, 7b for distributing fibers These two drums are fed pneumatically with fibers 9 coming from a machine 8 for producing short cut fibers. will depend on the subsequent application of the flat composite material.

Il convient de noter que les fibres 9 n'étant pas thermoliées au film l, elles ne sont pas nécessairement majoritairement thermoplastiques, contrairement aux fibres du document WO 94/24354.It should be noted that the fibers 9 not being thermo-bonded to the film 1, they are not necessarily predominantly thermoplastic, unlike the fibers of document WO 94/24354.

Les fibres 9 qui sont distribuées sur toute la surface d'aspiration (S) par le caisson 7 sont plaquées par aspiration à la surface de contact la du film perforé 1 qui est pré-enduite de colle. Les fibres 9 qui arrivent au droit d'une perforation du film 1 sont aspirées à travers cette perforation et à travers la portion rectiligne 5b et de la bande 5 du transporteur. Ces fibres résiduelles sont ensuite récupérées par des filtres (non représentées) en sortie du caisson d'aspiration 6. The fibers 9 which are distributed over the entire suction surface (S) by the box 7 are applied by suction to the contact surface 1a of the perforated film 1 which is pre-coated with glue. The fibers 9 which arrive at a perforation in the film 1 are sucked through this perforation and through the rectilinear portion 5b and the belt 5 of the conveyor. These residual fibers are then recovered by filters (not shown) at the outlet of the suction box 6.

On obtient ainsi sur le rouleau de stockage 2t un matériau plan composite comportant un film perforé 1 dont la face de contact la est recouverte d'une couche de fibres 9 qui sont liées à cette face uniquement au moyen d'un adhésif 3a à l'exception des perforations lc qui ne sont pas obstruées par les fibres 9. On a représenté à la figure 2 un exemple de réalisation d'un matériau plan composite pour lequel le film perforé 1 est un film à trois dimensions avec une face de contact la lisse et une face opposée lb présentant des perforations lc sous la forme de cratères tronconiques. L'invention pourra bien entendu être appliquée à tout type de film perforé à deux ou trois dimensions et quelle que soit la forme des perforations. On the storage roll 2t, a flat composite material is thus obtained comprising a perforated film 1, the contact face of which is covered with a layer of fibers 9 which are bonded to this face only by means of an adhesive 3a to the. except for the perforations lc which are not obstructed by the fibers 9. FIG. 2 shows an exemplary embodiment of a flat composite material for which the perforated film 1 is a three-dimensional film with a smooth contact face. and an opposite face 1b having perforations 1c in the form of frustoconical craters. The invention can of course be applied to any type of perforated film in two or three dimensions and whatever the shape of the perforations.

Plus la longueur des fibres 9 projetées à la surface la du film perforé 1 est importante, plus il y a un risque qu'une fibre arrivant au droit d'une perforation, telle que la fibre 9' illustrée sur la figure 3 reste collée à la surface la du film perforé 1, par ses deux extrémités 9'a de part et d'autre de la perforation lc et ce malgrè l'aspiration mise en oeuvre à travers le film. De préférence, dans le cadre de l'invention, la longueur des fibres 9 utilisée sera au maximum égale à cinq fois la plus petite dimension des perforations lc du film 1 mesurée dans le plan (PP) de la face de contact la du film perforé afin d'éviter les risques de collage des fibres au droit des perforations du film 1. The greater the length of the fibers 9 projected onto the surface 1a of the perforated film 1, the greater the risk that a fiber arriving at the right of a perforation, such as the fiber 9 'illustrated in FIG. 3, remains stuck to the perforation. the surface 1a of the perforated film 1, by its two ends 9'a on either side of the perforation 1c, despite the suction carried out through the film. Preferably, in the context of the invention, the length of the fibers 9 used will be at most equal to five times the smallest dimension of the perforations lc of the film 1 measured in the plane (PP) of the contact face la of the perforated film. in order to avoid the risk of fibers sticking in line with the perforations of the film 1.

On a représenté à la figure 4 un exemple particulier de réalisation d'un film perforé 1 qui a été notamment décrit dans la demande de brevet internationale
WO 96/02215, et qui présente deux types de perforations. Un premier type de perforations 10 comporte une section circulaire dans le plan (PP) de la face de contact la du film perforé 1. Un second type de perforation il comporte en section dans le plan (PP) de la face de contact la, une première partie lla de forme circulaire recoupant une seconde partie 1 lb de forme elliptique, la jonction entre ces deux parties formant un rétrécissement lic de largeur (e).FIG. 4 shows a particular embodiment of a perforated film 1 which has been described in particular in the international patent application.
WO 96/02215, and which has two types of perforations. A first type of perforation 10 comprises a circular section in the plane (PP) of the contact face 1a of the perforated film 1. A second type of perforation comprises a section in the plane (PP) of the contact face 1a, a first part 11a of circular shape intersecting a second part 1 lb of elliptical shape, the junction between these two parts forming a narrowing lic of width (e).

Dans l'exemple illustré, le diamètre (d) des perforations 10 du premier type est égal au diamètre de la première partie 1 la des perforations 11. Ainsi, la plus petite dimension des perforations du film de la figure 3 dans le plan (PP) de la face de contact la du film perforé 1 correspond à la largeur (e) du rétrécissement 1 1 c des perforations 11. La longueur des fibres 9 sera donc de préférence choisie inférieure ou égale à cinq fois cette largeur (e) dans le cas du film perforé particulier de la figure 4. In the example illustrated, the diameter (d) of the perforations 10 of the first type is equal to the diameter of the first part 11a of the perforations 11. Thus, the smallest dimension of the perforations of the film of FIG. 3 in the plane (PP ) of the contact face 1a of the perforated film 1 corresponds to the width (e) of the narrowing 1 1 c of the perforations 11. The length of the fibers 9 will therefore preferably be chosen less than or equal to five times this width (e) in the case of the particular perforated film of figure 4.

Dans un exemple précis de réalisation donné à titre indicatif, le film perforé 1 utilisé était celui de la figure 4, avec une largeur (e) pouvant varier entre 0,6 mm et 3 mm ; le taux de perforation du film 1, c'est-à-dire le rapport entre la surface ouverte du film et la surface totale était compris entre 15 % et 40 %. La bande 5a était un tapis maillé, à mailles carrées de côté faisant environ 8 mm ; la surface ouverte de la bande 5a représentait environ 35 % de sa surface totale. La longueur (L) et la largeur de la surface d'aspiration valaient respectivement 1 000 mm et 1 200 mm La dépression mise en oeuvre dans le caisson d'aspiration 6 valait environ 15 105 Pa. L'enduction de colle était réalisée selon la technique buse léchante avec une quantité de résine adhésive très faible, afin de ne pas altérer la souplesse du matériau plan composite. De préférence, l'enduction était réalisée à raison de 1 à 5 g/m2 de colle, pour une quantité de fibres comprise entre 2g/m2 et 20 g/m2. Les fibres utilisées étaient des fibres en polypropylène ayant une longueur comprise entre 2 mm et 3 mm, et ayant un titrage de 2,2 dtex. In a specific exemplary embodiment given by way of indication, the perforated film 1 used was that of FIG. 4, with a width (e) which may vary between 0.6 mm and 3 mm; the perforation rate of the film 1, that is to say the ratio between the open area of the film and the total area, was between 15% and 40%. Strip 5a was a mesh mat, with square mesh sides approximately 8mm; the open area of the strip 5a was about 35% of its total area. The length (L) and the width of the suction surface were respectively 1000 mm and 1200 mm The depression implemented in the suction box 6 was equal to approximately 15 105 Pa. The adhesive coating was carried out according to the licking nozzle technique with a very small amount of adhesive resin, so as not to alter the flexibility of the flat composite material. Preferably, the coating was carried out at a rate of 1 to 5 g / m2 of glue, for a quantity of fibers of between 2 g / m2 and 20 g / m2. The fibers used were polypropylene fibers having a length between 2 mm and 3 mm, and having a count of 2.2 dtex.

Claims (5)

REVENDICATIONS 1. Procédé de fabrication d'un matériau plan composite comportant un film perforé (1) recouvert d'une couche fibreuse sur au moins une face (la), dite face de contact, caractérisé en ce qu'il consiste à enduire préalablement la face de contact (la) du film perforé avec une colle (3a) et à projeter des fibres courtes (9) sur la face de contact (la) du film, en mettant en oeuvre une aspiration à travers le film perforé (1) de telle sorte que les fibres projetées au droit des perforations du film sont aspirées à travers le film perforé, et ne viennent pas obstruer les perforations.1. A method of manufacturing a flat composite material comprising a perforated film (1) covered with a fibrous layer on at least one face (la), called the contact face, characterized in that it consists in coating the face beforehand. of contact (la) of the perforated film with an adhesive (3a) and to project short fibers (9) on the contact face (la) of the film, by implementing a suction through the perforated film (1) of such so that the fibers projected to the right of the perforations of the film are sucked through the perforated film, and do not obstruct the perforations. 2. Procédé selon la revendication 1 caractérisé en ce que la longueur des fibres (9) est inférieure ou égale à 5 fois la plus petite dimension des perforations dans le plan (PP) de la face de contact (la) du film.2. Method according to claim 1 characterized in that the length of the fibers (9) is less than or equal to 5 times the smallest dimension of the perforations in the plane (PP) of the contact face (la) of the film. 3. Procédé selon la revendication 1 ou 2 caractérisé en ce que la pré-enduction de colle est réalisée à raison de 1 à 5 g/m2.3. Method according to claim 1 or 2 characterized in that the pre-coating of adhesive is carried out at a rate of 1 to 5 g / m2. 4. Matériau plan composite comportant un film perforé (1) recouvert d'une couche de fibres sur au moins une face, dite face de contact, caractérisé en ce que les fibres (9) sont liées à la face de contact (10) du film perforé uniquement au moyen d'une colle, en ce que la longueur des fibres est inférieure ou égale à 5 fois la plus petite dimension des perforations dans le plan (PP) de la face de contact (la) du film, et en ce que les perforations du film ne sont pas recouvertes de fibres (9).4. Composite plane material comprising a perforated film (1) covered with a layer of fibers on at least one face, called the contact face, characterized in that the fibers (9) are bonded to the contact face (10) of the film perforated only by means of an adhesive, in that the length of the fibers is less than or equal to 5 times the smallest dimension of the perforations in the plane (PP) of the contact face (la) of the film, and in that that the perforations of the film are not covered with fibers (9). 5. Utilisation du matériau plan composite de la revendication 4 ou du matériau plan composite obtenu par la mise en oeuvre du procédé des revendications 1 à 3 comme film respirable dans la fabrication d'articles d'hygiène absorbants, et notamment de couches-culottes ou de protection féminines. 5. Use of the flat composite material of claim 4 or of the composite flat material obtained by implementing the process of claims 1 to 3 as a breathable film in the manufacture of absorbent hygiene articles, and in particular diapers or diapers. protection for women.
FR9701780A 1997-02-11 1997-02-11 METHOD FOR MANUFACTURING A COMPOSITE PLANAR MATERIAL COMPRISING A LAYER OF FIBERS BONDED BY AN ADHESIVE TO A PERFORATED FILM AND DOES NOT COVER THE PERFORATIONS OF THE FILM Expired - Fee Related FR2759389B1 (en)

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US10258517B1 (en) * 2018-05-25 2019-04-16 Tredegar Film Products Corporation Fluid distribution material for absorbent articles
US10617575B2 (en) * 2017-03-13 2020-04-14 Tredegar Film Products Corporation Activated composite web for absorptive devices

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US4741941A (en) * 1985-11-04 1988-05-03 Kimberly-Clark Corporation Nonwoven web with projections
EP0403187A1 (en) * 1989-06-12 1990-12-19 BP Chemicals PlasTec GmbH Flexible composite with a perforated plastics film bonded to a fibrous layer and method of making the same
WO1994024354A1 (en) * 1993-04-19 1994-10-27 Guial S.A. Plane composite material comprising a pierced film and thermoplastic fibres, its use and method of manufacture
WO1996002215A1 (en) * 1994-07-15 1996-02-01 Guial S.A. Perforated thermoplastic sheet

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GB1228877A (en) * 1967-12-27 1971-04-21
EP0214608A2 (en) * 1985-09-09 1987-03-18 Kimberly-Clark Corporation Apertured nonwoven web
US4741941A (en) * 1985-11-04 1988-05-03 Kimberly-Clark Corporation Nonwoven web with projections
EP0403187A1 (en) * 1989-06-12 1990-12-19 BP Chemicals PlasTec GmbH Flexible composite with a perforated plastics film bonded to a fibrous layer and method of making the same
WO1994024354A1 (en) * 1993-04-19 1994-10-27 Guial S.A. Plane composite material comprising a pierced film and thermoplastic fibres, its use and method of manufacture
WO1996002215A1 (en) * 1994-07-15 1996-02-01 Guial S.A. Perforated thermoplastic sheet

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10617575B2 (en) * 2017-03-13 2020-04-14 Tredegar Film Products Corporation Activated composite web for absorptive devices
US11083641B2 (en) 2017-03-13 2021-08-10 Fitesa Film Products Llc Method of manufacturing an activated composite web and an activated composite web for absorptive devices
US10258517B1 (en) * 2018-05-25 2019-04-16 Tredegar Film Products Corporation Fluid distribution material for absorbent articles
US10500108B1 (en) 2018-05-25 2019-12-10 Tredegar Film Products Corporation Fluid distribution material for absorbent articles
US11160697B2 (en) 2018-05-25 2021-11-02 Fitesa Film Products Llc Fluid distribution material for absorbent articles

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