EP0819059A1 - Method and device for continuously producing compact multilayer paperboard sheets - Google Patents

Method and device for continuously producing compact multilayer paperboard sheets

Info

Publication number
EP0819059A1
EP0819059A1 EP97902423A EP97902423A EP0819059A1 EP 0819059 A1 EP0819059 A1 EP 0819059A1 EP 97902423 A EP97902423 A EP 97902423A EP 97902423 A EP97902423 A EP 97902423A EP 0819059 A1 EP0819059 A1 EP 0819059A1
Authority
EP
European Patent Office
Prior art keywords
strips
paper
strip
impregnation
drying
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Withdrawn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
EP97902423A
Other languages
German (de)
French (fr)
Inventor
Donato Rufo
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0819059A1 publication Critical patent/EP0819059A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/08—Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/70—Automated, e.g. using a computer or microcomputer
    • B32B2309/72—For measuring or regulating, e.g. systems with feedback loops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles

Definitions

  • the present invention relates to a continuous manufacturing process for sheets of compact multilayer cardboard, by means of laminated paper strips coming from reels mounted on unwinders arranged in line, in which at least three strips are superimposed and glued. of paper, the first strip being glued on one of its faces, the second strip then being applied and pressed against the first strip, the strips thus laminated being glued on one of their faces and the following strip being applied and pressed against them.
  • It also relates to a device for the continuous production of sheets of compact multilayer cardboard, this device comprising at least three unwinders arranged in a line and each carrying a reel of a strip of paper, means for superimposing, gluing and applying the strips together. against the others and squeeze them.
  • a device of this type is already known, described in particular in European patent application EP-A-0 598 960.
  • This device is designed to manufacture sheets of compact cardboard continuously and at high speed from reels carried by unwinders.
  • the first and the last reel carry paper covered on one side with a film of food-grade plastic, the other reels carry for example recycled paper.
  • the glues used to glue together the different sheets of paper that will form the cardboard are relatively expensive glues because the continuous production and at high speed, involves rapid drying of these glues.
  • the use of less expensive adhesives could be envisaged, however, provided that heating ramps are fitted on the production line.
  • the present invention proposes to overcome the drawbacks mentioned above by providing a method and a device for the continuous production of multilayer cardboard sheets, which can be produced at very high production rates and at particularly competitive costs without the need for preparing the layers beforehand.
  • each strip of paper is preheated before gluing by means of a preheating device to reduce the residual moisture in the paper and thus reduce the setting time of the glue
  • the accelerated drying of the adhesive is carried out by generation of a thermal flux on the paper strips after each superposition and pressing of the strips following their gluing,
  • the residual rheumatism of the laminated strips is detected and the thermal flux is regulated as a function of this humidity in order to standardize the drying, and - an impregnation is carried out by means of at least a waterproofing substance on at least one face of said first and said last strip.
  • the impregnation is carried out before the strips are bonded against each other.
  • the impregnation is carried out at the end of the line after the strips have been glued against each other.
  • preheating is carried out on the laminated strips before gluing to receive a new strip of paper.
  • the heat flux can be generated by at least one ramp of infrared radiation, or a stream of hot air, but can also be generated by at least one ramp of infrared radiation combined with at least one stream of hot air.
  • the device according to the invention characterized in that it comprises:
  • said impregnation means are arranged to ensure re-impregnation of the strips prior to their bonding against each other.
  • these means are advantageously associated with a drying tunnel.
  • said impregnation means are arranged to ensure the impregnation of the strips after they have been bonded against each other.
  • the preheating means can be arranged to preheat the laminated strips before gluing to receive a new strip of paper.
  • said impregnation means comprise at least one roller for distributing said waterproofing substance and at least one impregnation roller, these rollers being arranged at a distance from each other and their distance corresponding to the thickness d '' a film of waterproofing substance to be transferred to the paper strips.
  • Said accelerated drying means can comprise at least one ramp of infrared radiation or a member generating a current of hot air or a combination of the two.
  • Each infrared radiation ramp advantageously comprises several ramp elements controlled by the humidity detection means which may consist of at least one optical sensor.
  • These detection means can be arranged before the accelerated drying means or at the end of the line after the strips have been glued together.
  • Said preheating means preferably comprise heating cylinders.
  • the device 10 comprises a first unwinder 11 comprising for example a first reel l ia carrying a first strip of paper 12 and a second reel 11b which is a reserve reel.
  • This first strip 12 is brought to a sizing station 13 which comprises a distributor roller 13a which dips in a container 13b containing glue, an impregnation roller 13c and a support roller 13d.
  • the impregnation roller 13c is placed at a distance from the distributor roller 13a such that the space between their peripheral surfaces corresponds substantially to the thickness of glue which it is desired to deposit on the lower surface of the paper strip 12.
  • the device comprises a second unwinder 21 identical to the unwinder 11 which comprises a coil 21a and a reserve coil 21b.
  • This unwinder delivers a second strip of paper 22 which is applied and pressed against the first strip of paper 12 by means of two pressure rollers 14 and 15.
  • the device advantageously comprises at least one, but preferably two heating ramps of infrared radiation 16 and 17 arranged respectively above and below the two strips of paper 12 and 22 laminated.
  • the device comprises two other unwinders, respectively 31 and 41 substantially identical to the unwinders 11 and 21 and which each deliver a strip of paper respectively 32 and 42.
  • a gluing station respectively 23 and 33 which have the function one of gluing the underside of the first two strips 12 and 22 laminated, and the other of gluing the underside of the first three strips 12, 22 and 32 previously laminated.
  • Pressing units comprising pressure rollers 24, 25 and 34, 35 are arranged after the gluing stations.
  • infrared radiation ramps 26, 27 on the one hand, 36, 37 on the other hand are mounted as a result of the pressing units.
  • Two impregnation units 43 and 44 are arranged, in the example described at the outlet of the line which follows the rollers 40a and 40b. These units each include a distribution roller 43a, 44a and an impregnation roller 43b, 44b, as well as a pressure roller 43c, 44c.
  • the impregnation unit 43 is arranged to ensure the impregnation of the lower layer of the cardboard sheet and the impregnation unit 44 is arranged to ensure the impregnation of the upper layer.
  • the impregnation can be carried out either on the glued cardboard sheet.
  • the units 43 and 44 are arranged at the location indicated in the figure. But this impregnation can also be done at the paper strips before gluing.
  • the impregnation units 43 ′ and 44 ′ shown in dashed lines, are respectively arranged between the unwinders 11 and 21 and after the unwinder 41.
  • drying tunnel 60 shown in dashed lines, at the outlet of the impregnation station 43 '.
  • the same equipment namely a drying tunnel 61 associated with an impregnation unit 44 ′, is placed after the unwinder 41.
  • the line described above comprises preheating devices 70 to 75 constituted by heated cylinders mounted after each unwinder 11, 21, 31 and 41 and before each gluing station 13, 23 and 33.
  • These preheating devices make it possible to bring back the residual value of the humidity of each strip of paper (for devices 70, 71, 73 and 75) and of strips in multiple layers (for subsequent devices 72 and 74) to less than 7%. Therefore, high speed bonding can be performed.
  • the infrared heating ramps 16 and 17, 26 and 27, 36 and 37 which each consist of several ramp elements, are associated with humidity detectors respectively 80, 81 and 82 which capture the rate residual humidity and transmit a signal which controls the switching on of one or more elements of each of the ramps as a function of this humidity.
  • the humidity detectors 80, 81 and 82 can, for example, be made up of optical sensors which supply an electrical signal dependent on the light reflection capacity of the paper strips. Indeed, the differences in residual moisture of the paper generate different powers of reflection. In the example shown, these humidity detectors are positioned before each heating ramp. Another possible solution is to provide a single humidity detector disposed at the end of the production line 10, for example, before the impregnation devices 43 and 44, this detector acting upstream.
  • This line makes it possible to produce strips of high quality multilayer cardboard, at particularly competitive prices. Therefore, the product can be used to produce quality packaging, very efficient, capable of replacing products made with other materials such as wood, polystyrene or other synthetic materials.
  • a first strip of paper 12 is unwound from a first unwinder 11, it is preheated in a first preheating device 70 to reduce its residual humidity and its underside is glued in a gluing station 13,
  • a second strip of paper 22 is unwound from a second unwinder 21, it is preheated in a second preheating device 71 then it is applied and pressed against the underside of the first strip of paper 12 glued between two rollers pressers 14 and 15, and the drying of the adhesive is accelerated between two heating ramps 16 and 17,
  • a fourth strip of paper 42 is unwound from a fourth unwinder 41, it is preheated in a sixth preheating device 75 then it is applied and it is pressed against the underside of the first three strips laminated and glued between two pressure rollers 34 and 35, and the drying of the adhesive is accelerated between two heating ramps 36 and 37,
  • the compact multilayer cardboard sheet 50 obtained is shaped by laminating the four sheets of paper 12, 22, 32 and 42 around two successive shaping rollers 40a and 40b,
  • the heating ramps 16, 17, 24, 25, 34 and 35 are regulated as a function of the residual humidity of the strips laminated by humidity detectors 80, 81 and 82 placed before each pair of ramps. heating, so as to standardize this residual humidity as much as possible.
  • the number of paper strips is not limited, the preheating devices can be provided either on each strip, or before each gluing station, the humidity detectors can be limited to one placed at the end of the production line, the impregnation units can be provided respectively on the first and the last strip before bonding and other modifications.

Landscapes

  • Laminated Bodies (AREA)

Abstract

A method and a device for continuously producing compact multilayer paperboard sheets at high production rates and at a particularly competitive cost. The production device (10) comprises at least three mutually aligned feed rollers (11, 21, 31, 41) that each support a roll (11a, 21a) of a paper web (12, 22, 32, 42), and means for stacking and coating (13, 23, 33) the webs with an adhesive, urging them together and pressing (14, 24, 34) them. Said device comprises preheating means (71-75) for preheating each paper web (12, 22, 32, 42) prior to coating, accelerated adhesive drying means (16, 17, 26, 27, 36, 37) for generating a heat flow after the webs have been stacked and pressed following the coating step, sensing means (80, 81, 82) for sensing the residual moisture content in the bonded webs, means for adjusting the heat flow depending on the moisture content so that uniform drying is achieved, and impregnating means (43, 44, 43', 44') for impregnating at least one side of the first (12) and last (42) paper webs with a waterproofing substance. The method and device are suitable for use with any kind of paperboard packaging, particularly for food, and for replacing products containing wood, polystyrene or other synthetic materials.

Description

PROCEDE ET DISPOSITIF DE FABRICATION EN CONTINU DE FEUILLES DE CARTON MULTICOUCHE COMPACTPROCESS AND DEVICE FOR THE CONTINUOUS MANUFACTURE OF SHEETS OF COMPACT MULTILAYER CARTON
La présente invention concerne un procédé de fabrication en continu de feuilles de carton multicouche compact, au moyen de bandes de papier contrecollées provenant de bobines montées sur des dérouleurs disposés en ligne, dans lequel l'on superpose et l'on colle au moins trois bandes de papier, la première bande étant encollée sur une de ses faces, la deuxième bande étant ensuite appliquée et pressée contre la première bande, les bandes ainsi contrecollées étant encollées sur une de leur faces et la bande suivante étant appliquée et pressée contre elles.The present invention relates to a continuous manufacturing process for sheets of compact multilayer cardboard, by means of laminated paper strips coming from reels mounted on unwinders arranged in line, in which at least three strips are superimposed and glued. of paper, the first strip being glued on one of its faces, the second strip then being applied and pressed against the first strip, the strips thus laminated being glued on one of their faces and the following strip being applied and pressed against them.
Elle concerne également un dispositif de fabrication en continu de feuilles de carton multicouche compact, ce dispositif comportant au moins trois dérouleurs disposés en ligne et portant chacun une bobine d'une bande de papier, des moyens pour superposer, encoller, appliquer les bandes les unes contre les autres et les presser.It also relates to a device for the continuous production of sheets of compact multilayer cardboard, this device comprising at least three unwinders arranged in a line and each carrying a reel of a strip of paper, means for superimposing, gluing and applying the strips together. against the others and squeeze them.
On connaît déjà un dispositif de ce type décrit notamment dans la demande de brevet européen EP-A-0 598 960. Ce dispositif est conçu pour fabriquer en continu et à grande vitesse des feuilles de carton compact à partir de bobines portées par des dérouleurs. La première et la dernière bobine portent du papier recouvert sur une face d'un film de matière plastique alimentaire, les autres bobines portent par exemple du papier recyclé.A device of this type is already known, described in particular in European patent application EP-A-0 598 960. This device is designed to manufacture sheets of compact cardboard continuously and at high speed from reels carried by unwinders. The first and the last reel carry paper covered on one side with a film of food-grade plastic, the other reels carry for example recycled paper.
La réalisation d'emballages alimentaires en papier recyclé n'est pas autorisée si les faces intérieures et extérieures des emballages, c'est-à-dire notamment les parties en contact avec les produits alimentaires ne sont pas protégées par un film en plastique alimentaire ou similaire.The production of food packaging in recycled paper is not authorized if the interior and exterior faces of the packaging, that is to say in particular the parts in contact with food products are not protected by a plastic film for food or similar.
En outre, pour ces emballages, se pose le problème de l'étanchéité. Qu'ils soient constitués de cageots ou de boîtes, destinés à contenir des fruits, des légumes, des produits surgelés ou autres, l'humidité ambiante ou celle dégagée par les produits eux- mêmes risque, si les emballages ne sont pas plastifiés, de subir des déformations ou de s'affaiblir suite à l'absorption de cette humidité. En conséquence, la plastification des feuilles de carton est nécessaire. Toutefois, la technique utilisée dans la publication européenne, illustrant l'art antérieur le plus proche, présente des inconvénients.In addition, for these packages, there is the problem of sealing. Whether they consist of crates or boxes, intended to contain fruit, vegetables, frozen or other products, ambient humidity or that released by the products themselves may, if the packaging is not plasticized, be deformed or weakened by the absorption of this moisture. Consequently, the laminating of the cardboard sheets is necessary. However, the technique used in the European publication, illustrating the closest prior art, has drawbacks.
Les colles employées pour coller entre elles les différentes feuilles de papier qui formeront le carton, sont des colles relativement coûteuses parce que la fabrication en contmu et à grande vitesse, implique un séchage rapide de ces colles. L'emploi de colles moins coûteuses pourrait être envisagé à condition toutefois de monter des rampes de chauffage sur la ligne de production.The glues used to glue together the different sheets of paper that will form the cardboard, are relatively expensive glues because the continuous production and at high speed, involves rapid drying of these glues. The use of less expensive adhesives could be envisaged, however, provided that heating ramps are fitted on the production line.
Malheureusement, l'emploi de ces rampes n'est pas compatible avec l'utilisation de feuilles de papier recouvertes d'un film de plastique qui subit des déformations, plisse et éventuellement se déchire lorsqu'il est soumis à un flux thermique intense délivré par lesdites rampes de chauffage.Unfortunately, the use of these ramps is not compatible with the use of sheets of paper covered with a plastic film which undergoes deformations, wrinkles and possibly tears when it is subjected to an intense thermal flux delivered by said heating rails.
De ce fait, l'utilisation de feuilles pourvues d'un film de matière plastique implique l'utilisation de colles coûteuses à temps d'ouverture faible et limite les cadences de production.Therefore, the use of sheets provided with a plastic film involves the use of expensive adhesives with short opening times and limits production rates.
Des dispositifs de chauffage sont décrits dans la publication allemande DE-A-22 19Heating devices are described in the German publication DE-A-22 19
265 et prévus dans une machine de production de feuilles multicouche qui est alimentée par plusieurs bandes préimprégnées de résine polyester par exemple. Ces bandes sont chauffées dans un four puis assemblées par superposition et pressées au moyen d'un tambour de presse également chauffé qui provoque une polymérisation des résines et par conséquent le contrecollage des bandes. Cette machine nécessite la préparation préalable des bandes, ce qui rend le coût de fabrication très élevé.265 and provided in a multi-layer sheet production machine which is fed by several pre-impregnated strips of polyester resin for example. These strips are heated in an oven then assembled by superposition and pressed by means of a press drum also heated which causes polymerization of the resins and therefore the laminating of the strips. This machine requires the prior preparation of the strips, which makes the manufacturing cost very high.
La présente invention se propose de pallier les inconvénients mentionnés ci-dessus en offrant un procédé et un dispositif de fabrication en continu de feuilles de carton multicouche, pouvant être produites à des cadences de production très élevées et à des coûts particulièrement compétitifs sans avoir besoin de préparation les couches préalablement.The present invention proposes to overcome the drawbacks mentioned above by providing a method and a device for the continuous production of multilayer cardboard sheets, which can be produced at very high production rates and at particularly competitive costs without the need for preparing the layers beforehand.
Ce but est atteint par le procédé selon l'invention, caractérisé en ce que : - l'on procède à un préchauffage de chaque bande de papier avant son encollage au moyen d'un dispositif de préchauffage pour réduire l'humidité résiduelle du papier et réduire ainsi le temps de prise de la colle,This object is achieved by the method according to the invention, characterized in that: - each strip of paper is preheated before gluing by means of a preheating device to reduce the residual moisture in the paper and thus reduce the setting time of the glue,
- l'on procède au séchage accéléré de la colle par génération d'un flux thermique sur les bandes de papier après chaque superposition et pressage des bandes suite à leur encollage,the accelerated drying of the adhesive is carried out by generation of a thermal flux on the paper strips after each superposition and pressing of the strips following their gluing,
- l'on procède à la détection de rhumidité résiduelle des bandes contrecollées et l'on procède à la régulation du flux thermique en fonction de cette humidité pour uniformiser le séchage, et - l'on procède à une imprégnation au moyen d'au moins une substance imperméabilisante d'au moins une face de ladite première et de ladite dernière bande.- the residual rheumatism of the laminated strips is detected and the thermal flux is regulated as a function of this humidity in order to standardize the drying, and - an impregnation is carried out by means of at least a waterproofing substance on at least one face of said first and said last strip.
Selon un premier mode de réalisation avantageux, l'on effectue l'imprégnation antérieurement au collage des bandes les unes contre les autres.According to a first advantageous embodiment, the impregnation is carried out before the strips are bonded against each other.
Selon un second mode de réalisation avantageux, l'on effectue l'imprégnation en bout de ligne après le collage des bandes les unes contre les autres.According to a second advantageous embodiment, the impregnation is carried out at the end of the line after the strips have been glued against each other.
De préférence, l'on effectue le préchauffage sur les bandes contrecollées avant leur encollage pour recevoir une nouvelle bande de papier.Preferably, preheating is carried out on the laminated strips before gluing to receive a new strip of paper.
Le flux thermique peut être généré par au moins une rampe de rayonnement infrarouge, ou un courant d'air chaud, mais peut aussi être généré par au moins une rampe de rayonnement infrarouge combinée à au moins un courant d'air chaud.The heat flux can be generated by at least one ramp of infrared radiation, or a stream of hot air, but can also be generated by at least one ramp of infrared radiation combined with at least one stream of hot air.
Ce but est également atteint par le dispositif selon l'invention, caractérisé en ce qu'il comporte :This object is also achieved by the device according to the invention, characterized in that it comprises:
- des moyens de préchauffage de chaque bande de papier avant son encollage pour réduire l'humidité résiduelle du papier et réduire ainsi le temps de prise de la colle, - des moyens de séchage accéléré de la colle par génération d'un flux thermique après chaque superposition et pressage des bandes suite à leur encollage,- means for preheating each strip of paper before gluing to reduce the residual moisture in the paper and thus reduce the setting time of the adhesive, - means for accelerated drying of the adhesive by generation of a heat flux after each superimposition and pressing of the strips following their gluing,
- des moyens de détection de l'humidité résiduelle des bandes contrecollées et des moyens de régulation du flux thermique en fonction de cette humidité pour uniformiser le séchage, et - des moyens pour imprégner avec une substance imperméabilisante au moins une face de la première et de la dernière bande de papier.means for detecting the residual humidity of the laminated strips and means for regulating the heat flow as a function of this humidity in order to standardize the drying, and - Means for impregnating with a waterproofing substance at least one face of the first and of the last strip of paper.
Selon un premier mode de réaUsation avantageux, lesdits moyens d'imprégnation sont agencés pour assurer rimprégnation des bandes antérieurement à leur collage les unes contre les autres. Dans ce cas, ces moyens sont avantageusement associés à un tunnel de séchage.According to a first advantageous embodiment, said impregnation means are arranged to ensure re-impregnation of the strips prior to their bonding against each other. In this case, these means are advantageously associated with a drying tunnel.
Selon un second moyen de réalisation avantageux, lesdits moyens d'imprégnation sont agencés pour assurer l'imprégnation des bandes postérieurement à leur collage les unes contre les autres.According to a second advantageous embodiment, said impregnation means are arranged to ensure the impregnation of the strips after they have been bonded against each other.
Les moyens de préchauffage peuvent être agencés pour assurer le préchauffage des bandes contrecollées avant leur encollage pour recevoir une nouvelle bande de papier.The preheating means can be arranged to preheat the laminated strips before gluing to receive a new strip of paper.
De façon préférentielle, lesdits moyens d'imprégnation comportent au moins un rouleau distributeur de ladite substance imperméabilisante et au moins un rouleau d'imprégnation, ces rouleaux étant disposés à distance l'un de l'autre et leur écart correspondant à l'épaisseur d'un film de substance imperméabilisante à reporter sur les bandes de papier.Preferably, said impregnation means comprise at least one roller for distributing said waterproofing substance and at least one impregnation roller, these rollers being arranged at a distance from each other and their distance corresponding to the thickness d '' a film of waterproofing substance to be transferred to the paper strips.
Lesdits moyens de séchage accéléré peuvent comporter au moins une rampe de rayonnement infrarouge ou un organe générateur d'un courant d'air chaud ou encore une combinaison des deux.Said accelerated drying means can comprise at least one ramp of infrared radiation or a member generating a current of hot air or a combination of the two.
Chaque rampe de rayonnement infrarouge comporte avantageusement plusieurs éléments de rampe commandés par les moyens de détection de l'humidité qui peuvent être constitués d'au moins un capteur optique.Each infrared radiation ramp advantageously comprises several ramp elements controlled by the humidity detection means which may consist of at least one optical sensor.
Ces moyens de détection peuvent être disposés avant les moyens de séchage accéléré ou en bout de ligne après le collage des bandes les unes contre les autres.These detection means can be arranged before the accelerated drying means or at the end of the line after the strips have been glued together.
Lesdits moyens de préchauffage comportent de préférence des cylindres chauffants. L'invention sera mieux comprise en référence au dessin annexé dont la figure unique représente à titre d'exemple non limitatif une forme de réahsation préférée du procédé et du dispositif selon l'invention.Said preheating means preferably comprise heating cylinders. The invention will be better understood with reference to the accompanying drawing, the single figure of which represents, by way of nonlimiting example, a preferred form of reahsation of the method and of the device according to the invention.
En référence à la figure, le dispositif 10 comporte un premier dérouleur 11 comprenant par exemple une première bobine l ia portant une première bande de papier 12 et une deuxième bobine 11b qui est une bobine de réserve. Cette première bande 12 est amenée vers une station d'encollage 13 qui comporte un rouleau distributeur 13a qui trempe dans un bac 13b contenant de la colle, un rouleau d'imprégnation 13c et un rouleau d'appui 13d.Referring to the figure, the device 10 comprises a first unwinder 11 comprising for example a first reel l ia carrying a first strip of paper 12 and a second reel 11b which is a reserve reel. This first strip 12 is brought to a sizing station 13 which comprises a distributor roller 13a which dips in a container 13b containing glue, an impregnation roller 13c and a support roller 13d.
Le rouleau d'imprégnation 13c est disposé à une distance du rouleau distributeur 13a telle que l'espace entre leurs surfaces périphériques correspond sensiblement à l'épaisseur de colle que l'on souhaite déposer sur la surface inférieure de la bande de papier 12.The impregnation roller 13c is placed at a distance from the distributor roller 13a such that the space between their peripheral surfaces corresponds substantially to the thickness of glue which it is desired to deposit on the lower surface of the paper strip 12.
Le dispositif comporte un deuxième dérouleur 21 identique au dérouleur 11 qui comporte une bobine 21a et une bobine de réserve 21b. Ce dérouleur délivre une deuxième bande de papier 22 qui est appliquée et pressée contre la première bande de papier 12 au moyen de deux rouleaux presseurs 14 et 15.The device comprises a second unwinder 21 identical to the unwinder 11 which comprises a coil 21a and a reserve coil 21b. This unwinder delivers a second strip of paper 22 which is applied and pressed against the first strip of paper 12 by means of two pressure rollers 14 and 15.
Pour accélérer le séchage de la colle et assurer la liaison des deux bandes de papier 12 et 22, le dispositif comporte avantageusement au moins une, mais de préférence deux rampes de chauffage de rayonnement infrarouge 16 et 17 disposées respectivement au-dessus et en dessous des deux bandes de papier 12 et 22 contrecollées.To accelerate the drying of the glue and to ensure the connection of the two strips of paper 12 and 22, the device advantageously comprises at least one, but preferably two heating ramps of infrared radiation 16 and 17 arranged respectively above and below the two strips of paper 12 and 22 laminated.
Dans l'exemple représenté, le dispositif comprend deux autres dérouleurs, respectivement 31 et 41 sensiblement identiques aux dérouleurs 11 et 21 et qui délivrent chacun une bande de papier respectivement 32 et 42. A chacun de ces dérouleurs est associée une station d'encollage respectivement 23 et 33 qui ont pour fonction l'une d'encoller la face inférieure des deux premières bandes 12 et 22 contrecollées, et l'autre d'encoller la face inférieure des trois premières bandes 12, 22 et 32 préalablement contrecollées. Des unités de pressage comportant des rouleaux presseurs 24, 25 et 34, 35 sont disposées à la suite des stations d'encollage. Enfin des rampes de rayonnement infrarouge 26, 27 d'une part, 36, 37 d'autre part sont montées à la suite des unités de pressage.In the example shown, the device comprises two other unwinders, respectively 31 and 41 substantially identical to the unwinders 11 and 21 and which each deliver a strip of paper respectively 32 and 42. To each of these unwinders is associated a gluing station respectively 23 and 33 which have the function one of gluing the underside of the first two strips 12 and 22 laminated, and the other of gluing the underside of the first three strips 12, 22 and 32 previously laminated. Pressing units comprising pressure rollers 24, 25 and 34, 35 are arranged after the gluing stations. Finally infrared radiation ramps 26, 27 on the one hand, 36, 37 on the other hand are mounted as a result of the pressing units.
A la sortie des composants décrits ci-dessus sont disposés deux rouleaux de mise en forme 40a, 40b de la feuille de carton compact 50 obtenue par contrecollage des quatre feuilles de papier 12, 22, 32 et 42.At the outlet of the components described above are arranged two shaping rollers 40a, 40b of the sheet of compact cardboard 50 obtained by laminating the four sheets of paper 12, 22, 32 and 42.
Deux unités d'imprégnation 43 et 44 sont disposées, dans l'exemple décrit à la sortie de la ligne qui suit les rouleaux 40a et 40b. Ces unités comportent chacune un rouleau de distribution 43a, 44a et un rouleau d'imprégnation 43b, 44b, ainsi qu'un rouleau presseur 43c, 44c.Two impregnation units 43 and 44 are arranged, in the example described at the outlet of the line which follows the rollers 40a and 40b. These units each include a distribution roller 43a, 44a and an impregnation roller 43b, 44b, as well as a pressure roller 43c, 44c.
On notera que l'unité d'imprégnation 43 est agencée pour assurer l'imprégnation de la couche inférieure de la feuille de carton et l'unité d'imprégnation 44 est agencée pour assurer l'imprégnation de la couche supérieure.It will be noted that the impregnation unit 43 is arranged to ensure the impregnation of the lower layer of the cardboard sheet and the impregnation unit 44 is arranged to ensure the impregnation of the upper layer.
Comme mentionné précédemment, rimprégnation peut être effectuée soit sur la feuille de carton collée. Dans ce cas, les unités 43 et 44 sont disposées à l'emplacement indiqué sur la figure. Mais cette imprégnation peut également se faire au niveau des bandes de papier avant encollage. Dans ce cas, les unités d'imprégnation 43' et 44', représentées en traits interrompus, sont respectivement disposées entre les dérouleurs 11 et 21 et après le dérouleur 41.As mentioned previously, the impregnation can be carried out either on the glued cardboard sheet. In this case, the units 43 and 44 are arranged at the location indicated in the figure. But this impregnation can also be done at the paper strips before gluing. In this case, the impregnation units 43 ′ and 44 ′, shown in dashed lines, are respectively arranged between the unwinders 11 and 21 and after the unwinder 41.
Dans ce dernier cas, il est avantageux de prévoir un tunnel de séchage 60, représenté en traits interrompus, à la sortie de la station d'imprégnation 43'. Le même équipement, à savoir un tunnel de séchage 61 associé à une unité d'imprégnation 44', est disposé après le dérouleur 41.In the latter case, it is advantageous to provide a drying tunnel 60, shown in dashed lines, at the outlet of the impregnation station 43 '. The same equipment, namely a drying tunnel 61 associated with an impregnation unit 44 ′, is placed after the unwinder 41.
Alors que dans les lignes connues de l'art antérieur, la vitesse de fabrication en continu de feuilles de carton multicouche n'atteint que 60 à 80 mètres par minute, la ligne décrite ci-dessus peut atteindre des vitesses de l'ordre de 200 à 250 mètres par minute. En conséquence, la productivité de cette ligne est triplée voire quadruplée par rapport aux lignes connues. Cette amélioration de performance est due à un perfectionnement au niveau de la préparation des bandes de papier avant leur encollage. Le papier a une humidité naturelle assez élevée. Cette humidité constitue un facteur de ralentissement du séchage de la colle. Or, tout le processus de fabrication est conditionné par la vitesse de séchage de la colle. En conséquence, si on parvient à réduire le temps de prise de la colle, on peut accélérer le processus de fabrication du carton multicouche.While in the lines known from the prior art, the continuous production speed of sheets of multilayer cardboard reaches only 60 to 80 meters per minute, the line described above can reach speeds of the order of 200 at 250 meters per minute. Consequently, the productivity of this line is tripled or even quadrupled compared to known lines. This improvement in performance is due to an improvement in the preparation of the paper strips before gluing. The paper has a fairly high natural humidity. This humidity is a slowing factor glue drying. However, the entire manufacturing process is conditioned by the speed of drying of the adhesive. Consequently, if the glue setting time can be reduced, the manufacturing process for multilayer cardboard can be accelerated.
La ligne décrite ci-dessus comporte des dispositifs de préchauffage 70 à 75 constitués par des cylindres chauffés montés après chaque dérouleur 11, 21, 31 et 41 et avant chaque station d'encollage 13, 23 et 33. Ces dispositifs de préchauffage permettent de ramener la valeur résiduelle de l'humidité de chaque bande de papier (pour les dispositifs 70, 71, 73 et 75) et des bandes en couches multiples (pour les dispositifs suivants 72 et 74) à moins de 7 %. De ce fait, le collage à grande vitesse peut être effectué. Par ailleurs, les rampes de chauffage par rayonnement infrarouge 16 et 17, 26 et 27, 36 et 37, qui sont constituées chacune de plusieurs éléments de rampes, sont associées à des détecteurs d'humidité respectivement 80, 81 et 82 qui captent le taux d'humidité résiduelle et transmettent un signal qui commande l'enclenchement d'un ou de plusieurs éléments de chacune des rampes en fonction de cette humidité. Par ce moyen, on parvient à maîtriser l'uniformité du séchage des bandes de carton qui influe sur la planéité du produit final. Les détecteurs d'humidité 80, 81 et 82 peuvent être, par exemple, constitués de capteurs optiques qui fournissent un signal électrique dépendant de la capacité de réflexion de la lumière des bandes de papier. En effet, les différences d'humidité résiduelle du papier engendrent des pouvoirs de réflexion différents. Dans l'exemple représenté, ces détecteurs d'humidité sont positionnés avant chaque rampe de chauffage. Une autre solution envisageable est de prévoir un seul détecteur d'humidité disposé à la fin de la chaîne de fabrication 10, par exemple, avant les dispositifs d'imprégnation 43 et 44, ce détecteur agissant en amont.The line described above comprises preheating devices 70 to 75 constituted by heated cylinders mounted after each unwinder 11, 21, 31 and 41 and before each gluing station 13, 23 and 33. These preheating devices make it possible to bring back the residual value of the humidity of each strip of paper (for devices 70, 71, 73 and 75) and of strips in multiple layers (for subsequent devices 72 and 74) to less than 7%. Therefore, high speed bonding can be performed. In addition, the infrared heating ramps 16 and 17, 26 and 27, 36 and 37, which each consist of several ramp elements, are associated with humidity detectors respectively 80, 81 and 82 which capture the rate residual humidity and transmit a signal which controls the switching on of one or more elements of each of the ramps as a function of this humidity. By this means, it is possible to control the uniformity of the drying of the cardboard strips which influences the flatness of the final product. The humidity detectors 80, 81 and 82 can, for example, be made up of optical sensors which supply an electrical signal dependent on the light reflection capacity of the paper strips. Indeed, the differences in residual moisture of the paper generate different powers of reflection. In the example shown, these humidity detectors are positioned before each heating ramp. Another possible solution is to provide a single humidity detector disposed at the end of the production line 10, for example, before the impregnation devices 43 and 44, this detector acting upstream.
Cette ligne permet de réaliser des bandes de carton multicouche de grande qualité, à des prix particulièrement compétitifs. De ce fait, le produit peut être utilisé pour réaliser des emballages de qualité, très performants, susceptibles de remplacer des produits réalisés avec d'autres matériaux tels que le bois, le polystyrène ou d'autres matières synthétiques.This line makes it possible to produce strips of high quality multilayer cardboard, at particularly competitive prices. Therefore, the product can be used to produce quality packaging, very efficient, capable of replacing products made with other materials such as wood, polystyrene or other synthetic materials.
Les autres éléments composant la ligne à savoir des installations de mise en forme et de coupe, sont conventionnels et ne font pas partie de l'invention. Le procédé de fabrication en continu de feuilles de carton multicouche destiné à la mise en oeuvre du dispositif de fabrication décrit ci-dessus comporte les différentes étapes suivantes :The other elements making up the line, namely shaping and cutting installations, are conventional and do not form part of the invention. The process for the continuous production of sheets of multilayer cardboard intended for the implementation of the manufacturing device described above comprises the following different stages:
- on déroule une première bande de papier 12 d'un premier dérouleur 11, on la préchauffe dans un premier dispositif de préchauffage 70 pour réduire son humidité résiduelle et on encolle sa face inférieure dans une station d'encollage 13,a first strip of paper 12 is unwound from a first unwinder 11, it is preheated in a first preheating device 70 to reduce its residual humidity and its underside is glued in a gluing station 13,
- on déroule une deuxième bande de papier 22 d'un deuxième dérouleur 21, on la préchauffe dans un deuxième dispositif de préchauffage 71 puis on l'applique et on la presse contre la face inférieure de la première bande de papier 12 encollée entre deux rouleaux presseurs 14 et 15, et on accélère le séchage de la colle entre deux rampes de chauffage 16 et 17,- a second strip of paper 22 is unwound from a second unwinder 21, it is preheated in a second preheating device 71 then it is applied and pressed against the underside of the first strip of paper 12 glued between two rollers pressers 14 and 15, and the drying of the adhesive is accelerated between two heating ramps 16 and 17,
- on préchauffe les deux premières bandes 12 et 22 contrecollées dans un troisième dispositif de préchauffage 72 et on encolle leur face inférieure dans une station d'encollage 23, - on déroule une troisième bande de papier 32 d'un troisième dérouleur 31, on la préchauffe dans un quatrième dispositif de préchauffage 73 puis on l'applique et on la presse contre la face inférieure des deux premières bandes contrecollées et encollées entre deux rouleaux presseurs 24 et 25, et on accélère le séchage de la colle entre deux rampes de chauffage 26 et 27, - on préchauffe les trois premières bandes 12, 22 et 32 contrecollées dans un cinquième dispositif de préchauffage 74 et on encolle leur face inférieure dans une station d'encollage 33,- Preheating the first two strips 12 and 22 laminated in a third preheating device 72 and gluing their underside in a gluing station 23, - we unroll a third strip of paper 32 from a third unwinder 31, we preheats in a fourth preheating device 73 then it is applied and pressed against the underside of the first two strips laminated and glued between two pressing rollers 24 and 25, and the drying of the adhesive is accelerated between two heating ramps 26 and 27, - the first three strips 12, 22 and 32 laminated in a fifth preheating device 74 are preheated and their underside is glued in a gluing station 33,
- on déroule une quatrième bande de papier 42 d'un quatrième dérouleur 41, on la préchauffe dans un sixième dispositif de préchauffage 75 puis on l'applique et on la presse contre la face inférieure des trois premières bandes contrecollées et encollées entre deux rouleaux presseurs 34 et 35, et on accélère le séchage de la colle entre deux rampes de chauffage 36 et 37,- a fourth strip of paper 42 is unwound from a fourth unwinder 41, it is preheated in a sixth preheating device 75 then it is applied and it is pressed against the underside of the first three strips laminated and glued between two pressure rollers 34 and 35, and the drying of the adhesive is accelerated between two heating ramps 36 and 37,
- on met en forme la feuille de carton multicouche compact 50 obtenue par contrecollage des quatre feuilles de papier 12, 22, 32 et 42 autour de deux rouleaux successifs de mise en forme 40a et 40b,the compact multilayer cardboard sheet 50 obtained is shaped by laminating the four sheets of paper 12, 22, 32 and 42 around two successive shaping rollers 40a and 40b,
- on imprègne ensuite les faces inférieure et supérieure de la feuille obtenue 50 respectivement dans une première unité d'imprégnation 43 puis une seconde unité d'imprégnation 44 disposées en ligne. Dans ce procédé de fabrication, on régule les rampes de chauffage 16, 17, 24, 25, 34 et 35 en fonction de l'humidité résiduelle des bandes contrecollées par des détecteurs d'humidité 80, 81 et 82 placés avant chaque paire de rampe de chauffage, de manière à uniformiser au maximum cette humidité résiduelle.- Then impregnated the lower and upper faces of the sheet obtained 50 respectively in a first impregnation unit 43 and then a second impregnation unit 44 arranged in line. In this manufacturing process, the heating ramps 16, 17, 24, 25, 34 and 35 are regulated as a function of the residual humidity of the strips laminated by humidity detectors 80, 81 and 82 placed before each pair of ramps. heating, so as to standardize this residual humidity as much as possible.
Les opérations ultérieures de mise en forme et de coupe sont conventionnelles et ne font pas partie de l'invention.The subsequent shaping and cutting operations are conventional and do not form part of the invention.
La présente invention n'est pas limitée à l'exemple de réahsation et de procédé décrit mais s'étend à toute modification et variante évidente pour l'homme de l'art.The present invention is not limited to the example of reahsation and method described but extends to any modification and variant obvious to those skilled in the art.
Notamment, le nombre de bandes de papier n'est pas limité, les dispositifs de préchauffage peuvent être prévus soit sur chaque bande, soit avant chaque station d'encollage, les détecteurs d'humidité peuvent être limités à un seul placé à la fin de la chaîne de fabrication, les unités d'imprégnation peuvent être prévues respectivement sur la première et la dernière bande avant collage et d'autres modifications. In particular, the number of paper strips is not limited, the preheating devices can be provided either on each strip, or before each gluing station, the humidity detectors can be limited to one placed at the end of the production line, the impregnation units can be provided respectively on the first and the last strip before bonding and other modifications.

Claims

Revendications claims
1. Procédé de fabrication en continu de feuilles de carton multicouche compact, au moyen de bandes de papier contrecollées provenant de bobines montées sur des dérouleurs disposés en hgne, dans lequel l'on superpose et l'on colle au moins trois bandes de papier (12, 22, 32, 42), la première bande (12) étant encollée sur une de ses faces, la deuxième bande (22) étant ensuite appliquée et pressée contre la première bande (12), les bandes ainsi contrecollées étant encollées sur une de leur faces et la bande suivante (32, 42) étant appliquée et pressée contre elles, caractérisé en ce que : - l'on procède à un préchauffage de chaque bande de papier (12, 22, 32, 42) avant son encollage au moyen d'un dispositif de préchauffage (70 à 75) pour réduire l'humidité résiduelle du papier et réduire ainsi le temps de prise de la colle,1. Process for the continuous production of sheets of compact multilayer cardboard, by means of laminated paper strips coming from reels mounted on unwinders arranged in hgne, in which at least three strips of paper are superimposed and glued ( 12, 22, 32, 42), the first strip (12) being glued on one of its faces, the second strip (22) then being applied and pressed against the first strip (12), the strips thus laminated being glued on a of their faces and the following strip (32, 42) being applied and pressed against them, characterized in that: - each strip of paper (12, 22, 32, 42) is preheated before gluing with means of a preheating device (70 to 75) to reduce the residual moisture of the paper and thus reduce the time for setting the glue,
- l'on procède au séchage accéléré de la colle par génération d'un flux thermique sur les bandes de papier après chaque superposition et pressage des bandes suite à leur encollage,the accelerated drying of the adhesive is carried out by generation of a thermal flux on the paper strips after each superposition and pressing of the strips following their gluing,
- l'on procède à la détection de l'humidité résiduelle des bandes contrecollées et l'on procède à la régulation du flux thermique en fonction de cette humidité pour uniformiser le séchage, etthe residual moisture of the laminated strips is detected and the heat flux is regulated as a function of this humidity in order to standardize the drying, and
- l'on procède à une imprégnation au moyen d'au moins une substance imperméabilisante d'au moins une face de ladite première (12) et de ladite dernière bande (42).- One impregnates with at least one waterproofing substance on at least one face of said first (12) and said last strip (42).
2. Procédé selon la revendication 1, caractérisé en ce que l'on effectue rimprégnation antérieurement au collage des bandes les unes contre les autres.2. Method according to claim 1, characterized in that the impregnation is carried out prior to the bonding of the strips against each other.
3. Procédé selon la revendication 1, caractérisé en ce que l'on effectue rimprégnation en bout de ligne après le collage des bandes les unes contre les autres.3. Method according to claim 1, characterized in that one impregnation is carried out at the end of the line after the gluing of the strips against each other.
4. Procédé selon la revendication 1, caractérisé en ce que l'on effectue le préchauffage sur les bandes contrecollées avant leur encollage pour recevoir une nouvelle bande de papier.4. Method according to claim 1, characterized in that one performs the preheating on the laminated strips before gluing to receive a new strip of paper.
5. Procédé selon la revendication 1, caractérisé en ce que le flux thermique est généré par au moins une rampe de rayonnement infrarouge (16, 17, 26, 27, 36, 37). 5. Method according to claim 1, characterized in that the heat flux is generated by at least one ramp of infrared radiation (16, 17, 26, 27, 36, 37).
6. Procédé selon la revendication 1, caractérisé en ce que le flux thermique est généré par au moins un courant d'air chaud.6. Method according to claim 1, characterized in that the heat flux is generated by at least one stream of hot air.
7. Procédé selon la revendication 1, caractérisé en ce que le flux thermique est généré par au moins une rampe de rayonnement infrarouge combinée à un courant d'air chaud.7. Method according to claim 1, characterized in that the heat flux is generated by at least one ramp of infrared radiation combined with a current of hot air.
8. Dispositif de fabrication en continu de feuilles de carton multicouche compact, ce dispositif (10) comportant au moins trois dérouleurs (11, 21, 31, 41) disposés en ligne et portant chacun une bobine (lia, 21a) d'une bande de papier (12, 22, 32, 42), des moyens pour encoller, superposer et apphquer les bandes les unes contre les autres et les presser, caractérisé en ce qu'il comporte :8. Device for continuously manufacturing sheets of compact multilayer cardboard, this device (10) comprising at least three unwinders (11, 21, 31, 41) arranged in line and each carrying a reel (11a, 21a) of a strip of paper (12, 22, 32, 42), means for gluing, superimposing and pressing the strips against each other and pressing them, characterized in that it comprises:
- des moyens de préchauffage (71 à 75) de chaque bande de papier (12, 22. 32, 42) avant son encollage et/ou son assemblage à d'autres bandes pour réduire l'humidité résiduelle du papier et réduire ainsi le temps de prise de la colle,- preheating means (71 to 75) of each strip of paper (12, 22, 32, 42) before it is glued and / or assembled with other strips to reduce the residual moisture of the paper and thus reduce the time glue,
- des moyens de séchage (16, 17, 26, 27, 36, 37) accéléré de la colle par génération d'un flux thermique après chaque superposition et pressage des bandes suite à leur encollage,- drying means (16, 17, 26, 27, 36, 37) accelerated by the adhesive by generation of a thermal flux after each superposition and pressing of the strips following their gluing,
- des moyens de détection (80, 81, 82) de l'humidité résiduelle des bandes contrecollées et des moyens de régulation du flux thermique en fonction de cette humidité pour uniformiser le séchage, etmeans for detecting (80, 81, 82) the residual humidity of the laminated strips and means for regulating the heat flow as a function of this humidity in order to standardize the drying, and
- des moyens pour imprégner (43, 44, 43', 44') avec une substance imperméabilisante au moins une face de la première (12) et de la dernière bande de papier (42).- Means for impregnating (43, 44, 43 ', 44') with a waterproofing substance on at least one face of the first (12) and the last strip of paper (42).
9. Dispositif selon la revendication 8, caractérisé en ce que lesdits moyens d'imprégnation (43', 44') sont agencés pour assurer rimprégnation des bandes antérieurement à leur collage les unes contre les autres.9. Device according to claim 8, characterized in that said impregnation means (43 ', 44') are arranged to ensure reimpregnation of the strips prior to their bonding against each other.
10. Dispositif selon la revendication 9, caractérisé en ce que lesdits moyens d'imprégnation (43', 44') sont associés à un tunnel de séchage (60, 61).10. Device according to claim 9, characterized in that said impregnation means (43 ', 44') are associated with a drying tunnel (60, 61).
11. Dispositif selon la revendication 8, caractérisé en ce que lesdits moyens d'imprégnation (43, 44) sont agencés pour assurer l'imprégnation des bandes postérieurement à leur collage les unes contre les autres. 11. Device according to claim 8, characterized in that said impregnation means (43, 44) are arranged to ensure the impregnation of the strips after they have been bonded against each other.
12. Dispositif selon la revendication 8, caractérisé en ce que les moyens de préchauffage sont agencés pour préchauffer les bandes contrecollées avant leur encollage pour recevoir une nouvelle bande de papier.12. Device according to claim 8, characterized in that the preheating means are arranged to preheat the laminated strips before gluing to receive a new strip of paper.
13. Dispositif selon la revendication 8, caractérisé en ce que lesdits moyens d'imprégnation (43, 44) comportent au moins un rouleau distributeur (43 a, 44b) de ladite substance imperméabilisante et au moins un rouleau d'imprégnation (43b, 44b), ces rouleaux étant disposés à distance l'un de l'autre et leur écart correspondant à l'épaisseur d'un film de substance imperméabihsante à reporter sur les bandes de papier.13. Device according to claim 8, characterized in that said impregnation means (43, 44) comprise at least one distributor roller (43a, 44b) of said waterproofing substance and at least one impregnation roller (43b, 44b ), these rollers being arranged at a distance from each other and their distance corresponding to the thickness of a film of waterproofing substance to be transferred to the paper strips.
14. Dispositif selon la revendication 8, caractérisé en ce que lesdits moyens de séchage accéléré comportent au moins une rampe de rayonnement infrarouge (16, 17, 26, 27, 36, 37).14. Device according to claim 8, characterized in that said accelerated drying means comprise at least one ramp of infrared radiation (16, 17, 26, 27, 36, 37).
15. Dispositif selon la revendication 8, caractérisé en ce que lesdits moyens de séchage accéléré comportent au moins un organe générateur d'un courant d'air chaud.15. Device according to claim 8, characterized in that said accelerated drying means comprise at least one member generating a current of hot air.
16. Dispositif selon la revendication 8, caractérisé en ce que lesdits moyens de séchage accéléré comportent au moins une rampe de rayonnement infrarouge (16, 17,16. Device according to claim 8, characterized in that said accelerated drying means comprise at least one ramp of infrared radiation (16, 17,
26, 27, 36, 37) combinée à au moins un organe générateur d'un courant d'air chaud.26, 27, 36, 37) combined with at least one member generating a current of hot air.
17. Dispositif selon les revendications 14 et 16, caractérisé en ce que chaque rampe de rayonnement infrarouge (16, 17, 26, 27, 36, 37) comporte plusieurs éléments de rampe commandés par les moyens de détection de l'humidité (80, 81, 82).17. Device according to claims 14 and 16, characterized in that each infrared radiation ramp (16, 17, 26, 27, 36, 37) comprises several ramp elements controlled by the humidity detection means (80, 81, 82).
18. Dispositif selon la revendication 17, caractérisé en ce que les moyens de détection d'humidité comportent au moins un capteur optique (80, 81, 82).18. Device according to claim 17, characterized in that the humidity detection means comprise at least one optical sensor (80, 81, 82).
19. Dispositif selon la revendication 18, caractérisé en ce que les moyens de détection19. Device according to claim 18, characterized in that the detection means
(80, 81, 82) sont disposés avant les moyens de séchage accéléré.(80, 81, 82) are arranged before the accelerated drying means.
20. Dispositif selon la revendication 18, caractérisé en ce que les moyens de détection (80, 81, 82) sont disposés en bout de hgne après le collage des bandes les unes contre les autres. 20. Device according to claim 18, characterized in that the detection means (80, 81, 82) are arranged at the end of the hgne after the strips are bonded against each other.
21. Dispositif selon la revendication 8, caractérisé en ce que lesdits moyens de préchauffage comportent des cylindres chauffants (70 à 75). 21. Device according to claim 8, characterized in that said preheating means comprise heating cylinders (70 to 75).
EP97902423A 1996-02-01 1997-01-31 Method and device for continuously producing compact multilayer paperboard sheets Withdrawn EP0819059A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9601454 1996-02-01
FR9601454A FR2744387B1 (en) 1996-02-01 1996-02-01 PROCESS AND DEVICE FOR THE CONTINUOUS MANUFACTURE OF SHEETS OF COMPACT MULTILAYER CARTON
PCT/FR1997/000199 WO1997027999A1 (en) 1996-02-01 1997-01-31 Method and device for continuously producing compact multilayer paperboard sheets

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EP0819059A1 true EP0819059A1 (en) 1998-01-21

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EP97902423A Withdrawn EP0819059A1 (en) 1996-02-01 1997-01-31 Method and device for continuously producing compact multilayer paperboard sheets

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EP (1) EP0819059A1 (en)
CA (1) CA2218403A1 (en)
FR (1) FR2744387B1 (en)
WO (1) WO1997027999A1 (en)

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CN113954330B (en) * 2021-09-27 2023-05-26 安徽百维新材料有限公司 Heat-resistant flame-retardant gel heat-insulating board

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Also Published As

Publication number Publication date
FR2744387B1 (en) 1998-04-17
WO1997027999A1 (en) 1997-08-07
FR2744387A1 (en) 1997-08-08
CA2218403A1 (en) 1997-08-07

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