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EP0440575B1 - Method for applying adhesive to a paper web in the tobacco industry and cigarette filter rod obtained by this method - Google Patents

Method for applying adhesive to a paper web in the tobacco industry and cigarette filter rod obtained by this method Download PDF

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Publication number
EP0440575B1
EP0440575B1 EP19910810017 EP91810017A EP0440575B1 EP 0440575 B1 EP0440575 B1 EP 0440575B1 EP 19910810017 EP19910810017 EP 19910810017 EP 91810017 A EP91810017 A EP 91810017A EP 0440575 B1 EP0440575 B1 EP 0440575B1
Authority
EP
European Patent Office
Prior art keywords
adhesive
paper
projection means
web
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19910810017
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German (de)
French (fr)
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EP0440575A1 (en
Inventor
Michel Grossmann
Eduard Ringgenberg
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.)
Philip Morris Products SA
Original Assignee
Fabriques de Tabac Reunies 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 Fabriques de Tabac Reunies SA filed Critical Fabriques de Tabac Reunies SA
Publication of EP0440575A1 publication Critical patent/EP0440575A1/en
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/14—Machines of the continuous-rod type
    • A24C5/24—Pasting the seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device

Definitions

  • the present invention relates to a method of gluing one or more longitudinal zones of a strip of paper intended to form the envelope of a sausage, in particular in the tobacco industry. It also relates to a cigarette filter rod obtained according to the above method.
  • the gluing of the paper strips intended to form the cylindrical casing envelopes, in particular in the tobacco industry, is an operation which must satisfy multiple requirements.
  • the simplest and most widespread solution up to now consists in using a glue liquid at room temperature, for example polyvinyl acetate, and in gluing the bonding zones which will later form the joints, by transfer of this glue liquid on the strip of paper, for example by means of a thin disc driven in rotation of which a part of the periphery is immersed in a container of glue.
  • the patent application document DE-A-34 01 588 describes for example an improvement made to applicators of this kind. Instead of the disc applicators, glue applicators have also been proposed for the deposition of polyvinyl acetate, provided with a nozzle which opens into contact with the paper (US Pat. No. 3,619,328).
  • the aim of the present invention is to propose a simple sizing process making it possible to carry out the sizing operation at high speed on all kinds of paper, in particular highly porous papers, and the costs of which are used are as small as possible.
  • a particularly advantageous application of this process relates to the manufacture of the strands of cigarette filter.
  • Another object of the invention is therefore a cigarette filter rod comprising the characteristics mentioned in claims 8 and 9.
  • a strip of paper l which scrolls at high speed in an installation so as to constitute the envelope of a cigarette filter rod designated by 2.
  • the band l constitutes a cylindrical envelope which surrounds a filtering mass 3 of cellulose acetate and the two edges of which are folded over one another and kept fixed by a glue joint 4.
  • This glue joint is called the seam joint.
  • a second adhesive joint 5 is located in the center of the strip and provides the connection between the filtering mass 3 and the strip l.
  • the strip l permanently receives on its central zone 6 a jet of liquid glue forming the inner seal in the form of a median thread.
  • a jet of liquid glue forming the inner seal in the form of a median thread.
  • a second jet of glue which forms a marginal thread 7 and constitutes the sewing thread.
  • the threads 6 and 7 are approximately 2 mm wide.
  • the strip 1 After having received the glue threads 6 and 7, projected horizontally, the strip 1 is led into a device for forming the flange, which is known per se and is only shown diagrammatically in FIG. l.
  • Guide means lift the edges of the strip to give it the shape of a U in which a continuous bar 3 of cellulose acetate, forming the material of the filter is engaged.
  • the assembly of the strip l and of the filling 3 then passes through a closing guide 27 in which the two edges of the strip l are folded over the mass 3 and pressed against one another, thus ensuring the adhesion of the connecting zones 6 and 7.
  • the sausage is then dried and cut into segments which are incorporated into cigarettes during subsequent operations.
  • the means used to deposit the two adhesive threads 6 and 7 are shown in more detail in FIGS. 2 and 3.
  • Fig. 2 shows the entire planned installation.
  • This installation includes a fully closed glue tank 8.
  • Tubing 9 comes out and leads the liquid adhesive to the two projectors 10 and 11 which are placed in front of the strip l at locations fixed so as to project the adhesive joints 6 and 7 thereon.
  • a tube 12 compressed air is admitted into the upper part of the container 8 in order to pressurize the liquid adhesive contained in this reservoir.
  • a valve 13 and a connector on the pipe 9 make it possible to supply the container 8 with adhesive, if necessary.
  • the installation requires a compressed air supply and adjustment and control means acting on this supply.
  • the control panel 14 comprises, in addition to the control switch 15, regulators 16, 17 and 18 adjustable and consequently making it possible to adjust the pressures of the air going, on the one hand, to the container 8 by the tube 12, d on the other hand, to the projector 10 by a pipe 19 into which a heating device 20 is introduced and finally into a duct 21 which supplies the projector 11.
  • the projection devices 10 and 11 are also supplied with compressed air at unregulated pressure, from a pipe 22, through a control valve 23. This control makes it possible to maneuver the needle of the projectors, as will be seen below.
  • the general supply of table 14 is carried out from a source of compressed air through a presetting regulator 24.
  • the device 10 comprises a nozzle 25 provided with an opening calibrated at its anterior end.
  • a movable needle, visible at 26, is biased by a spring so as to be held in a position where it closes the opening of the nozzle.
  • the air pressure arriving through the conduit 22 causes the needle to retreat and consequently the opening of the nozzle.
  • a mixture of air and liquid coming from the two conduits 9 and 19 is then brought behind the opening of the nozzle and projects a jet of fine droplets of liquid on the strip l which passes at high speed in front of this nozzle, at a certain distance, for example of the order of 4 mm. It has been found that different features make it possible to obtain results which fully satisfy the conditions.
  • the dosage of the adhesive with regard to the degree of fluidity and its capillarity characteristics must be adjusted by means of preliminary tests as a function of the desired running speed and the type of paper to be bonded.
  • the compressed air pressures must be determined from case to case with accuracy, as mentioned above.
  • the diameter of the droplets and the spraying rate depend on the characteristics of the opening of the nozzle as well as the dimensions and the shape of the interior chamber in which the mixing takes place. .
  • the glue which is deposited by projection, in very fine droplets, on the fibers of the paper does not penetrate the thickness of the latter. A reliable connection is thus obtained, in particular at the so-called “sewing” joint, preventing any fouling of the machines, even with highly porous paper.

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  • Manufacturing Of Cigar And Cigarette Tobacco (AREA)
  • Paper (AREA)

Description

La présente invention a pour objet un procédé d'encollage d'une ou plusieurs zones longitudinales d'une bande de papier destinée à former l'enveloppe d'un boudin, notamment dans l'industrie du tabac. Elle a également pour objet un boudin de filtre à cigarette obtenu selon le procédé précité.The present invention relates to a method of gluing one or more longitudinal zones of a strip of paper intended to form the envelope of a sausage, in particular in the tobacco industry. It also relates to a cigarette filter rod obtained according to the above method.

L'encollage des bandes de papier destinées à former les enveloppes cylindriques de boudin, notamment dans l'industrie du tabac, est une opération qui doit satisfaire à de multiples exigences. La solution la plus simple et la plus répandue jusqu'à maintenant, consiste à utiliser une colle liquide à la température ambiante, par exemple le polyvinyle-acétate, et à encoller les zones de liaison qui formeront ultérieurement les joints, par transfert de cette colle liquide sur la bande de papier, par exemple au moyen d'un disque mince entraîné en rotation dont une partie de la périphérie plonge dans un récipient de colle. Le document de demande de brevet DE-A-34 01 588 décrit par exemple un perfectionnement apporté aux applicateurs de ce genre. Au lieu des applicateurs à disques, on a également proposé, pour le dépôt de colle de polyvinyle-acétate, des encolleurs munis d'une buse qui débouche au contact du papier (US-A-3,619,328).The gluing of the paper strips intended to form the cylindrical casing envelopes, in particular in the tobacco industry, is an operation which must satisfy multiple requirements. The simplest and most widespread solution up to now consists in using a glue liquid at room temperature, for example polyvinyl acetate, and in gluing the bonding zones which will later form the joints, by transfer of this glue liquid on the strip of paper, for example by means of a thin disc driven in rotation of which a part of the periphery is immersed in a container of glue. The patent application document DE-A-34 01 588 describes for example an improvement made to applicators of this kind. Instead of the disc applicators, glue applicators have also been proposed for the deposition of polyvinyl acetate, provided with a nozzle which opens into contact with the paper (US Pat. No. 3,619,328).

Toutefois, un inconvénient majeur de ces dispositifs est qu'ils sont inutilisables avec les papiers hautement poreux dont l'utilisation se répand de plus en plus, notamment dans la fabrication des boudins de filtre. Ces dispositifs ont par ailleurs d'autres inconvénients notamment la vitesse d'application est limitée.However, a major drawback of these devices is that they cannot be used with highly porous papers, the use of which is becoming more and more widespread, in particular in the manufacture of filter tubes. These devices also have other drawbacks, in particular the speed of application is limited.

On a proposé plus récemment d'utiliser, pour l'opération d'encollage, des colles à haute température de fusion, qui se solidifient à la température ambiante et qui doivent par conséquent être appliquées à chaud. On peut, pour cela utiliser des dispositifs qui projettent la colle liquide sur la bande de papier et le brevet allemand DE-A-35 25 889 par exemple, décrit la construction d'une buse de projection adaptée à cette technique. Celle-ci est avantageuse dans certains cas, notamment lorsque les exigences en ce qui concerne la résistance du joint de colle sont élevées, mais elle est d'une application délicate. Le procédé est coûteux. La vitesse d'application est également relativement limitée. Enfin, l'utilisation de colle liquide à chaud ne convient pas pour les papiers hautement poreux dont on a parlé plus haut.More recently, it has been proposed to use, for the sizing operation, adhesives with a high melting temperature, which solidify at ambient temperature and which must therefore be applied hot. For this, it is possible to use devices which project the liquid glue onto the paper strip and the German patent DE-A-35 25 889 for example, describes the construction of a spray nozzle adapted to this technique. This is advantageous in certain cases, in particular when the requirements as regards the strength of the adhesive joint are high, but it is difficult to apply. The process is expensive. The application speed is also relatively limited. Finally, the use of hot liquid glue is not suitable for the highly porous papers mentioned above.

L'emploi d'applicateurs à pulvérisateurs est également connu pour le dépôt d'adhésifs dits "structuraux" ou des colles de polychloroprène et acryliques (FR-A-26 23 108). Le contenu de ce dernier document ne permet toutefois pas d'arriver à une solution fiable au problème de l'encollage des enveloppes des boudins dans l'industrie du tabac, tel qu'il se présente actuellement.The use of spray applicators is also known for depositing so-called "structural" adhesives or polychloroprene and acrylic adhesives (FR-A-26 23 108). The content of this latter document does not, however, allow a reliable solution to be found to the problem of the sizing of the casing envelopes in the tobacco industry, as it currently stands.

Ainsi, le but de la présente invention est de proposer un procédé d'encollage simple permettant de réaliser l'opération d'encollage à grande vitesse sur tous les genres de papier, notamment les papiers hautement poreux, et dont les coûts de mise en oeuvre soient aussi réduits que possible.Thus, the aim of the present invention is to propose a simple sizing process making it possible to carry out the sizing operation at high speed on all kinds of paper, in particular highly porous papers, and the costs of which are used are as small as possible.

Dans ce but, le procédé d'encollage a été développé, comportant les opérations mentionnées dans les revendications 1 à 7.For this purpose, the sizing process has been developed, comprising the operations mentioned in claims 1 to 7.

Une application particulièrement avantageuse de ce procédé concerne la fabrication des boudins de filtre à cigarettes. Un autre objet de l'invention est donc un boudin de filtre à cigarettes comportant les caractéristiques mentionnées dans les revendications 8 et 9.A particularly advantageous application of this process relates to the manufacture of the strands of cigarette filter. Another object of the invention is therefore a cigarette filter rod comprising the characteristics mentioned in claims 8 and 9.

On va décrire ci-après, à titre d'exemple et en se référant au dessin annexé, une forme de mise en oeuvre du procédé selon l'invention.

  • La fig. 1 est une vue en perspective schématique et éclatée montrant le déplacement d'une bande de papier au cours de la formation d'un boudin de filtre à cigarette,
  • la fig. 2 est un schéma de divers composants d'une installation d'encollage permettant l'encollage de la bande de papier visible à la fig. 1 et
  • la fig. 3 est une vue en élévation d'un projecteur de colle utilisable dans l'installation de la fig. 2.
An embodiment of the method according to the invention will be described below, by way of example and with reference to the appended drawing.
  • Fig. 1 is a schematic and exploded perspective view showing the displacement of a strip of paper during the formation of a cigarette filter rod,
  • fig. 2 is a diagram of various components of a sizing installation allowing the sizing of the strip of paper visible in FIG. 1 and
  • fig. 3 is an elevational view of an adhesive projector usable in the installation of FIG. 2.

A la fig. l, on voit une bande de papier l qui défile à grande vitesse dans une installation de manière à constituer l'enveloppe d'un boudin de filtre de cigarette désigné par 2. Lorsque le boudin est formé, la bande l constitue une enveloppe cylindrique qui entoure une masse filtrante 3 d'acétate de cellulose et dont les deux bords sont rabattus l'un sur l'autre et maintenus fixés par un joint de colle 4. Ce joint de colle est appelé le joint de couture. Un second joint de colle 5 est situé au centre de la bande et assure la liaison entre la masse filtrante 3 et la bande l.In fig. l, we see a strip of paper l which scrolls at high speed in an installation so as to constitute the envelope of a cigarette filter rod designated by 2. When the rod is formed, the band l constitutes a cylindrical envelope which surrounds a filtering mass 3 of cellulose acetate and the two edges of which are folded over one another and kept fixed by a glue joint 4. This glue joint is called the seam joint. A second adhesive joint 5 is located in the center of the strip and provides the connection between the filtering mass 3 and the strip l.

Pour permettre un encollage à grande vitesse, la bande l reçoit en permanence sur sa zone centrale 6 un jet de colle liquide formant le joint intérieur sous forme d'un filet médian. D'autre part, le long d'un de ses bords, elle reçoit un second jet de colle qui forme un filet marginal 7 et constitue le filet de couture. Les filets 6 et 7 ont une largeur d'environ 2 mm.To allow gluing at high speed, the strip l permanently receives on its central zone 6 a jet of liquid glue forming the inner seal in the form of a median thread. On the other hand, along one of its edges, it receives a second jet of glue which forms a marginal thread 7 and constitutes the sewing thread. The threads 6 and 7 are approximately 2 mm wide.

Après avoir reçu les filets de colle 6 et 7, projetés horizontalement, la bande l est conduite dans un dispositif de formation du boudin, qui est connu en soi et n'est représenté que schématiquement à la fig. l. Des moyens de guidage relèvent les bords de la bande pour lui donner la forme d'un U dans lequel une barre continue 3 d'acétate de cellulose, formant la matière du filtre est engagée. L'ensemble de la bande l et du remplissage 3 passe ensuite dans un guide de fermeture 27 dans lequel les deux bords de la bande l sont rabattus sur la masse 3 et pressés l'un contre l'autre, assurant ainsi l'adhérence des zones de liaison 6 et 7.After having received the glue threads 6 and 7, projected horizontally, the strip 1 is led into a device for forming the flange, which is known per se and is only shown diagrammatically in FIG. l. Guide means lift the edges of the strip to give it the shape of a U in which a continuous bar 3 of cellulose acetate, forming the material of the filter is engaged. The assembly of the strip l and of the filling 3 then passes through a closing guide 27 in which the two edges of the strip l are folded over the mass 3 and pressed against one another, thus ensuring the adhesion of the connecting zones 6 and 7.

Le boudin est ensuite séché puis découpé en segments qui sont incorporés aux cigarettes au cours d'opérations ultérieures.The sausage is then dried and cut into segments which are incorporated into cigarettes during subsequent operations.

Les moyens utilisés pour déposer les deux filets de colle 6 et 7 sont représentés plus en détail aux fig. 2 et 3.The means used to deposit the two adhesive threads 6 and 7 are shown in more detail in FIGS. 2 and 3.

La fig. 2 montre l'ensemble de l'installation prévue. Cette installation comporte un réservoir de colle 8 entièrement fermé. Une tubulure 9 en sort et conduit la colle liquide aux deux projecteurs 10 et 11 qui sont placés devant la bande l à des emplacements fixes de façon à projeter sur elle les joints de colle 6 et 7. Par une tubulure 12, de l'air comprimé est admis dans la partie supérieure du récipient 8 afin de mettre en pression la colle liquide contenue dans ce réservoir. Une vanne 13 et un raccord sur la conduite 9 permettent de procéder à l'alimentation du récipient 8 en colle, en cas de besoin.Fig. 2 shows the entire planned installation. This installation includes a fully closed glue tank 8. Tubing 9 comes out and leads the liquid adhesive to the two projectors 10 and 11 which are placed in front of the strip l at locations fixed so as to project the adhesive joints 6 and 7 thereon. Through a tube 12, compressed air is admitted into the upper part of the container 8 in order to pressurize the liquid adhesive contained in this reservoir. A valve 13 and a connector on the pipe 9 make it possible to supply the container 8 with adhesive, if necessary.

L'installation nécessite une alimentation en air comprimé et des moyens de réglage et de commande agissant sur cette alimentation. Le tableau de commande 14 comporte, outre le commutateur de commande 15, des détendeurs 16, 17 et 18 ajustables et permettant par conséquent de régler les pressions de l'air allant, d'une part, au récipient 8 par la tubulure 12, d'autre part, au projecteur 10 par une canalisation 19 dans laquelle est introduit un dispositif de réchauffage 20 et enfin dans un conduit 21 qui alimente le projecteur 11. Les dispositifs de projection 10 et 11 sont également alimentés en air comprimé à pression non réglée, à partir d'une canalisation 22, à travers une vanne de commande 23. Cette commande permet de manoeuvrer le pointeau des projecteurs, comme on le verra plus loin. L'alimentation générale du tableau 14 s'effectue à partir d'une source d'air comprimé à travers un détendeur à pré-réglage 24.The installation requires a compressed air supply and adjustment and control means acting on this supply. The control panel 14 comprises, in addition to the control switch 15, regulators 16, 17 and 18 adjustable and consequently making it possible to adjust the pressures of the air going, on the one hand, to the container 8 by the tube 12, d on the other hand, to the projector 10 by a pipe 19 into which a heating device 20 is introduced and finally into a duct 21 which supplies the projector 11. The projection devices 10 and 11 are also supplied with compressed air at unregulated pressure, from a pipe 22, through a control valve 23. This control makes it possible to maneuver the needle of the projectors, as will be seen below. The general supply of table 14 is carried out from a source of compressed air through a presetting regulator 24.

On a constaté que l'on pouvait obtenir une installation fonctionnant parfaitement et répondant aux exigences les plus sévères en utilisant des dispositifs de projection de construction très simple et courante comme le dispositif 10 représenté à la fig. 3. Ce dispositif comprend trois raccords d'entrée situés à sa partie arrière et qui sont raccordés respectivement aux conduits 9, 19 et 22. Dans le cas du dispositif ll, la tubulure d'amenée d'air de pulvérisation sera la tubulure 21 et non pas la tubulure 19.It has been found that an installation which functions perfectly and meets the most stringent requirements can be obtained by using projection devices of very simple and common construction such as the device 10 shown in FIG. 3. This device comprises three inlet fittings situated at its rear part and which are connected respectively to the conduits 9, 19 and 22. In the case of the device ll, the spray air supply pipe will be the pipe 21 and not tubing 19.

Le dispositif 10 comporte une buse 25 munie d'une ouverture calibrée à son extrémité antérieure. Un pointeau mobile, visible en 26, est sollicité par un ressort de façon à être maintenu dans une position où il obture l'ouverture de la buse. La pression d'air arrivant par le conduit 22 provoque le recul du pointeau et par conséquent l'ouverture de la buse. Un mélange d'air et de liquide provenant des deux conduits 9 et 19 est alors amené derrière l'ouverture de la buse et projette un jet de fines gouttelettes de liquide sur la bande l qui défile à grande vitesse devant cette buse, à une certaine distance, par exemple de l'ordre de 4 mm. On a constaté que différentes particularités permettaient d'obtenir des résultats qui satisfont pleinement aux conditions.The device 10 comprises a nozzle 25 provided with an opening calibrated at its anterior end. A movable needle, visible at 26, is biased by a spring so as to be held in a position where it closes the opening of the nozzle. The air pressure arriving through the conduit 22 causes the needle to retreat and consequently the opening of the nozzle. A mixture of air and liquid coming from the two conduits 9 and 19 is then brought behind the opening of the nozzle and projects a jet of fine droplets of liquid on the strip l which passes at high speed in front of this nozzle, at a certain distance, for example of the order of 4 mm. It has been found that different features make it possible to obtain results which fully satisfy the conditions.

Ainsi, il est avantageux de préchauffer l'air de projection du mélange destiné à former le joint de couture 7.Thus, it is advantageous to preheat the air for spraying the mixture intended to form the seam joint 7.

De toute manière, le dosage de la colle en ce qui concerne le degré de fluidité et ses caractéristiques de capillarité doit être ajusté au moyen d'essais préalables en fonction de la vitesse de défilement désirée et du type de papier à encoller. De même, les pressions d'air comprimé doivent être déterminées de cas en cas avec exactitude, comme on l'a dit plus haut.In any case, the dosage of the adhesive with regard to the degree of fluidity and its capillarity characteristics must be adjusted by means of preliminary tests as a function of the desired running speed and the type of paper to be bonded. Likewise, the compressed air pressures must be determined from case to case with accuracy, as mentioned above.

Comme dans tout dispositif de projection sous flux d'air comprimé, le diamètre des gouttelettes et le débit de projection dépendent des caractéristiques de l'ouverture de la buse ainsi que des dimensions et de la forme de la chambre intérieure dans laquelle se fait le mélange.As in any spraying device under compressed air flow, the diameter of the droplets and the spraying rate depend on the characteristics of the opening of the nozzle as well as the dimensions and the shape of the interior chamber in which the mixing takes place. .

On a constaté que le dispositif de projection décrit, qui est extrêmement simple, permet de réaliser un encollage fiable même sur des papiers hautement poreux à des vitesses encore inatteignables jusqu'à maintenant, par exemple des vitesses de l'ordre de 400 m/min.It has been found that the projection device described, which is extremely simple, makes it possible to carry out a reliable sizing even on highly porous papers at speeds that are still unattainable up to now, for example, speeds of the order of 400 m / min.

Des essais ont même montré qu'il était possible d'envisager une augmentation des vitesses de défilement jusqu'à un ordre de 600 m/min.Tests have even shown that it is possible to envisage an increase in running speeds up to an order of 600 m / min.

La colle qui se dépose par projection, en très fines gouttelettes, sur les fibres du papier ne pénètre pas dans l'épaisseur de ce dernier. On obtient ainsi, notamment au joint dit "de couture" une liaison fiable, évitant tout encrassement des machines, même avec un papier hautement poreux.The glue which is deposited by projection, in very fine droplets, on the fibers of the paper does not penetrate the thickness of the latter. A reliable connection is thus obtained, in particular at the so-called "sewing" joint, preventing any fouling of the machines, even with highly porous paper.

Claims (9)

  1. A method for applying adhesive to one or more longitudinal zones (6, 7) of a web of paper (1) intended to form the wrapper (2) of a rod (3), especially in the tobacco industry, using one or more projection means (10, 11) disposed at a fixed location, in front of which the web of paper passes, the said projection means being in part fed with a liquid adhesive (9) at room temperature and with a first supply of compressed air (22) serving to aactuate the one or more projection means so as to project onto each longitudinal zone to be applied with adhesive (6, 7) a jet of fine droplets of adhesive, characterized in that the web of paper (1) runs in front of the one or more projection means (10, 11) at a predetermined distance, different from zero, and in that the said projection means are supplied in addition with a second supply of air (19, 21) in order to make a mixture of liquid adhesive - air.
  2. The method according to claim 1, characterized in that one or more projection means (10, 11) are fed from a reservoir (8) in which the adhesive is kept under a regulated pressure.
  3. The method according to claim 2, characterized in that the adhesive is kept under pressure by means of compressed air (12).
  4. The method according to one of the preceding claims, characterized in that for at least one of the projection means (10) the second supply of compresssed air (19) is pre-heated (20).
  5. The method according to one of the preceding claims, characterized in that a polyvinyl acetate adhesive is used.
  6. The method according to one of the preceding claims, characterized in that a paper of high porosity is used.
  7. The method according to one of the preceding claims, characterized in that the web of paper (1) runs in front of the one or more projection means (10, 11) at a distance of about 4 mm.
  8. A cigarette filter-tip rod (2) obtained according to the method of one of the preceding claims, composed of a filtering mass (3) preferably of cellulose acetate covered by a cylindrical wrapper coming from a web of highly porous paper (1) the two edges of which overlap and are fixed to one another by an adhesive seam (4), characterized in that the said filtering mass is moreover fixed to the said cylindrical wrapper by an adhesive seam (5) on one of its generating lines.
  9. The cigarette rod according to claim 8, characterized in that the adhesive of the said seams (4, 5) is a polyvinyl acetate adhesive.
EP19910810017 1990-01-31 1991-01-11 Method for applying adhesive to a paper web in the tobacco industry and cigarette filter rod obtained by this method Expired - Lifetime EP0440575B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH315/90 1990-01-31
CH31590 1990-01-31

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EP0440575A1 EP0440575A1 (en) 1991-08-07
EP0440575B1 true EP0440575B1 (en) 1994-09-21

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EP0440575A1 (en) 1991-08-07
DE69104078T2 (en) 1995-04-20

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