EP0567580B1 - Method for fabricating a tube by rolling a metal strip glued to a cardboard band - Google Patents
Method for fabricating a tube by rolling a metal strip glued to a cardboard band Download PDFInfo
- Publication number
- EP0567580B1 EP0567580B1 EP92904851A EP92904851A EP0567580B1 EP 0567580 B1 EP0567580 B1 EP 0567580B1 EP 92904851 A EP92904851 A EP 92904851A EP 92904851 A EP92904851 A EP 92904851A EP 0567580 B1 EP0567580 B1 EP 0567580B1
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- EP
- European Patent Office
- Prior art keywords
- cardboard
- metal
- tube
- complex
- web
- 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
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- 239000011111 cardboard Substances 0.000 title claims abstract description 89
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 40
- 239000002184 metal Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 title abstract description 22
- 150000004696 coordination complex Chemical class 0.000 claims description 24
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 8
- 230000009172 bursting Effects 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 238000005034 decoration Methods 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 239000000123 paper Substances 0.000 description 6
- 235000012431 wafers Nutrition 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000760 Hardened steel Inorganic materials 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 208000031968 Cadaver Diseases 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 229940082150 encore Drugs 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
- B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31C3/00—Making tubes or pipes by feeding obliquely to the winding mandrel centre line
Definitions
- the present invention relates to a method of manufacturing a tube by rolling a metal strip laminated onto a cardboard strip.
- the tubes produced according to this process can in particular be used in all pyrotechnic applications, but are also used for the production of mandrels, cylindrical casings, colonnades with or without external decorations, various pieces of furniture, shelves, chests, or else of cans.
- Document US 3716435 corresponds to an application very similar to that of patent FR 1316315.
- the originality of this patent lies in the bevelling on both sides of the strip and in the discharge of these two sides in order to obtain a collar.
- the advantage of the technique developed in this document is that the tubes obtained are more leaktight and have improved internal and external flatness.
- the material used can be an aluminum film forming a sealing barrier which is laminated to a strip of cardboard.
- firing mortars are generally in the form of tubes produced by parallel or spiral rolling of cardboard strips.
- These cardboard tubes which must withstand high pressures and temperatures due to their use in the form of mortar, have notable drawbacks, namely poor resistance to humidity, very low burst strength, as well as an unsatisfactory fire resistance. It is known to remedy these various drawbacks by the use of adhesives and / or water-repellent and flame-retardant coatings impregnating the strips of cardboard or rolled paper to form the tube, a possible addition of an aluminum or material covering. synthetic, of the type of a polyethylene, allowing, in addition, to further increase the resistance to humidity. The burst strength is improved by simply thickening the tube by rolling several strips of high quality cardboard.
- the tubes obtained in this way are complex to manufacture, relatively expensive, and being nevertheless made only of cardboard, they are naturally fragile and therefore unreliable.
- tubes made of steel are known, and in particular those described in French patent FR-2 578 810 which relates to a method of manufacturing a metal container intended to receive ammunition.
- the container body is made from spiral rolling of a sheet metal sheet whose contiguous edges are stapled to each other to form a bead; this patent also proposes to provide in the length of the strip a continuous spiral rib projecting in the same direction as said bead and having the same pitch as the latter, so as to stiffen the strip, thereby increasing its mechanical strength and allowing use fairly small strip thicknesses.
- the metal body of a container manufactured in this way is unusable in the field of pyrotechnics; in fact, the metal tube thus formed necessarily has discontinuities which do not make it possible to obtain smooth and calibrated walls, desirable for a correct ejection of the pyrotechnic charges after explosion of the primer in the mortar; in addition, the manufacture of such tubes can only be done, in an industrial manner, by means of a specific machine very different from those which are commonly used for the parallel or spiral rolling of cardboard tubes.
- the present invention aims to remedy these drawbacks by proposing a method of manufacturing a reinforced cardboard and metal tube, characterized in that said tube is obtained by convolute or spiral rolling of at least one thick metal strip previously laminated on to the minus a strip of cardboard.
- the thick metal strip laminated to the cardboard strip constitutes a mechanical barrier providing excellent resistance to fire and humidity, as well as a particularly high resistance to bursting and crushing.
- the thick metallic strip used according to the invention is very different from thin and ductile metallic films, in particular aluminum, which are normally used, alone or in combination with polyethylene or paper, to improve the sealing of the tubes.
- cardboard-based the thickness of the thin films used as a sealing barrier does not exceed a few tens of micrometers, such an aluminum film can not contribute in any way to the rigidity of the assembly.
- the first step namely the bonding of a metal strip on at least one sheet of cardboard is delicate and must be carried out under well-controlled conditions; in particular, it is advisable to use hot glues reactivated when laminating the two materials, for example polymerizable resins, dextrins, or holt-melts.
- the choice of bonding temperature is made according to the glue used, which mainly depends on the type of cardboard rather than the nature of the metal strip; it is also advisable to exert a strong pressure on each face of the cardboard / metal complex during bonding, this pressure being supplied by cylinders superposed which pass the complex and whose spacing is adjustable.
- An essential advantage of this first variant of the invention is that the strips produced by slitting sheets of cardboard / metal complex, presented in rolls under traditional circular shears, can be fairly easily mounted on existing rolling machines without much modification of the latter; in this regard, it is only necessary to modify, on a spiraling machine, the system for transferring the reels to the machine magazine, the system for tensioning the belts, the continuous cutting members for the tubes, and in particular the circular knives and their cutting pressure.
- steps a) to c) of the previous variant are omitted and replaced by direct lamination of the two strips of cardboard and metal on the rolling machine; in this case, cardboard wafers and wafers of a metal strip are installed separately on the reels of the machine, then the strips are coated with an appropriate glue and finally laminated by hot pressing.
- the strip of the cardboard / metal complex which has just been produced is wound on the mandrel of the rolling machine under conditions identical to those of steps d) to f) of the first variant.
- a reinforced tube according to the invention can comprise a strip 1 of cardboard / metal complex, the metal face 2 of which faces towards the inside of said tube.
- This strip 1 is spiraled from edge to edge to form a continuous tube, practically smooth on its internal face. It is held by one or more external strips 3 of cardboard, the same width as that of the strip 1 of cardboard / metal complex.
- the outer strip (s) 3 are spiraled into contiguous turns around the strip 1 with an axial offset preferably equal to half of said width.
- the bonding takes place dynamically in a conventional manner by means of adhesives such as those already mentioned; the bonding conditions are perfectly known to those skilled in the art and the viscosity of the adhesives, the bonding temperature and the pressure exerted on the two strips 1 and 3 must in particular be adjusted.
- a first cardboard strip is rolled on the mandrel of a rolling machine while gluing on this first strip a strip of cardboard / metal complex, the cardboard face being turned towards the mandrel; in this way, tubes are obtained with an external metallic face and an internal cardboard face.
- the rolling of the internal and external strips is carried out with a preferential offset of half a width.
- a reinforced tube is made having its internal and external metallic faces.
- tubes in accordance with the process of the invention other than by spiral rolling, for example by combining a spiral rolling of the strip of the cardboard / metal complex and a parallel rolling of the holding strip of cardboard. It is also possible to provide several internal or external cardboard holding bands.
- a reinforced tube according to the invention for example from a strip 1 of the complex consisting of a metal strip 2 of work hardened steel of 15 hundredths of a millimeter laminated to a strip of cardboard 4 of 40 hundredths of a millimeter, this strip 1 of cardboard / metal complex being held by an external strip 3 of cardboard also 40 hundredths, has a final thickness of about 1.25 millimeters (the difference coming from the thicknesses of glues) and has a resistance to the burst greater than that of a cardboard tube only, the thickness of which would be 5 millimeters (for a diameter of 50 millimeters).
- the weight of the tube according to the invention is then divided by a factor ranging from 2 to 4 compared to that of the cardboard tube; this also provides an important advantage in the transportation of said tubes.
- the thickness of the metal strip 2 of the strip 1 of the cardboard / metal complex can be chosen, for a more or less hardened steel, in a range between 15 and 200 hundredths of a millimeter (fig. 1).
- a strip of cardboard 4 of 40 hundredths is sufficient in most cases; however, it is always possible to adapt this thickness by doubling or even tripling the layer of retaining cardboard, that is to say by rolling several external strips 3 of cardboard.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Making Paper Articles (AREA)
- Laminated Bodies (AREA)
Abstract
Description
La présente invention concerne un procédé de fabrication d'un tube par roulage d'une bande métallique contrecollée sur une bande de carton. Les tubes réalisés selon ce procédé peuvent notamment servir dans toutes les applications pyrotechniques, mais sont également utilisés pour la réalisation de mandrins, de boîtages cylindriques, de colonnades avec ou sans décorations extérieures, de mobiliers divers, d'étagères, de coffres, ou encore de boîtes de conserve.The present invention relates to a method of manufacturing a tube by rolling a metal strip laminated onto a cardboard strip. The tubes produced according to this process can in particular be used in all pyrotechnic applications, but are also used for the production of mandrels, cylindrical casings, colonnades with or without external decorations, various pieces of furniture, shelves, chests, or else of cans.
Des procédés de fabrication de tels tubes sont connus des documents FR-A-1.316.315 et US-A-3.716.435.
- 2.1. Le document FR 1 316 315 concerne un perfectionnement aux procédés de fabrication de tubes par roulage dont l'originalité réside dans l'enroulement spiralé avec chevauchement des bandes servant à constituer les tubes. Les bandes employées peuvent être en carton, en fibre, en résine synthétique ou encore en papier doublé d'une feuille ou d'un clinquant métallique, par exemple en aluminium. L'utilisation de ce dernier matériau correspond à la nécessité d'obtenir un tube étanche aux liquides, aux graisses, voire aux vapeurs. En outre, même si la bande double peut présenter une résistance mécanique suffisante pour l'application envisagée (normalement alimentaire), il est normal d'enrouler plusieurs bandes de renfort autour de cette double bande de manière à obtenir un corps tubulaire étanche.
- 2.1. The document FR 1 316 315 relates to an improvement in the methods of manufacturing tubes by rolling, the originality of which resides in the spiral winding with overlapping of the bands used to constitute the tubes. The strips used can be made of cardboard, fiber, synthetic resin or paper lined with a sheet or a metal foil, for example aluminum. The use of the latter material corresponds to the need to obtain a tube which is impermeable to liquids, greases or even vapors. In addition, even if the double strip can have sufficient mechanical strength for the intended application (normally food), it is normal to wrap several reinforcing strips around this double strip so as to obtain a sealed tubular body.
Le document US 3716435 correspond à une application très similaire à celle du brevet FR 1316315. L'originalité de ce brevet réside dans le biseautage des deux côtés de la bande et dans le refoulement de ces deux côtés en vue d'obtenir un collet. L'avantage de la technique développée dans ce document consiste en ce que les tubes obtenus sont plus étanches et présentent une planéité intérieure et extérieure améliorée. Ici encore, le matériau employé peut être un film d'aluminium formant barrière d'étanchéité qui est contrecollé sur une bande de carton.Document US 3716435 corresponds to an application very similar to that of patent FR 1316315. The originality of this patent lies in the bevelling on both sides of the strip and in the discharge of these two sides in order to obtain a collar. The advantage of the technique developed in this document is that the tubes obtained are more leaktight and have improved internal and external flatness. Here again, the material used can be an aluminum film forming a sealing barrier which is laminated to a strip of cardboard.
Dans le domaine de la pyrotechnie, les mortiers de tir se présentent généralement sous la forme de tubes fabriqués par roulage parallèle ou spiralé de bandes de carton. Ces tubes en carton, qui doivent résister à des pressions et à des températures élevées du fait de leur usage sous forme de mortier, présentent des inconvénients notables, à savoir une résistance à l'humidité médiocre, une résistance à l'éclatement très faible, ainsi qu'une résistance au feu peu satisfaisante. Il est connu de remédier à ces divers inconvénients par l'utilisation de colles et/ou d'enduits hydrofuges et ignifuges imprégnant les bandes de carton ou de papier roulées pour constituer le tube, un apport éventuel d'un habillage en aluminium ou en matière synthétique, du type d'un polyéthylène, permettant, en outre, d'augmenter encore la résistance à l'humidité. La résistance à l'éclatement est, quant à elle, améliorée tout simplement en épaississant le tube par le biais d'un roulage de plusieurs bandes d'un carton de qualité supérieure. Les tubes obtenus de cette façon sont complexes à fabriquer, relativement coûteux, et n'étant malgré tout faits que de carton, il sont naturellement fragiles et par conséquent peu fiables.In the field of pyrotechnics, firing mortars are generally in the form of tubes produced by parallel or spiral rolling of cardboard strips. These cardboard tubes, which must withstand high pressures and temperatures due to their use in the form of mortar, have notable drawbacks, namely poor resistance to humidity, very low burst strength, as well as an unsatisfactory fire resistance. It is known to remedy these various drawbacks by the use of adhesives and / or water-repellent and flame-retardant coatings impregnating the strips of cardboard or rolled paper to form the tube, a possible addition of an aluminum or material covering. synthetic, of the type of a polyethylene, allowing, in addition, to further increase the resistance to humidity. The burst strength is improved by simply thickening the tube by rolling several strips of high quality cardboard. The tubes obtained in this way are complex to manufacture, relatively expensive, and being nevertheless made only of cardboard, they are naturally fragile and therefore unreliable.
Par ailleurs, on connaît les tubes réalisés en acier, et notamment ceux décrits dans le brevet français FR-2 578 810 qui concerne un procédé de fabrication d'un conteneur métallique destiné à recevoir des munitions. Dans ce brevet, le corps du conteneur est réalisé à partir du roulage spiralé d'un feuillard de tôle dont les bords jointifs sont agrafés les uns aux autres pour constituer un bourrelet ; ce brevet propose également de ménager dans la longueur du feuillard une nervure spiralée continue faisant saillie dans le même sens que ledit bourrelet et ayant le même pas que celui-ci, de manière à réaliser un raidissage du feuillard, accroissant ainsi sa résistance mécanique et permettant d'utiliser des épaisseurs de feuillard assez faibles. Du fait de sa constitution, le corps métallique d'un conteneur fabriqué de cette façon est inutilisable dans le domaine de la pyrotechnie ; en effet, le tube métallique ainsi constitué présente nécessairement des discontinuités ne permettant pas d'obtenir des parois lisses et calibrées, souhaitables pour une éjection correcte des charges pyrotechniques après explosion de l'amorce dans le mortier ; en outre, la fabrication de tels tubes ne peut se faire, d'une manière industrielle, qu'au moyen d'une machine spécifique très différente de celles qui sont couramment utilisées pour le roulage parallèle ou spiralé de tubes en carton.Furthermore, tubes made of steel are known, and in particular those described in French patent FR-2 578 810 which relates to a method of manufacturing a metal container intended to receive ammunition. In this patent, the container body is made from spiral rolling of a sheet metal sheet whose contiguous edges are stapled to each other to form a bead; this patent also proposes to provide in the length of the strip a continuous spiral rib projecting in the same direction as said bead and having the same pitch as the latter, so as to stiffen the strip, thereby increasing its mechanical strength and allowing use fairly small strip thicknesses. Because of its constitution, the metal body of a container manufactured in this way is unusable in the field of pyrotechnics; in fact, the metal tube thus formed necessarily has discontinuities which do not make it possible to obtain smooth and calibrated walls, desirable for a correct ejection of the pyrotechnic charges after explosion of the primer in the mortar; in addition, the manufacture of such tubes can only be done, in an industrial manner, by means of a specific machine very different from those which are commonly used for the parallel or spiral rolling of cardboard tubes.
La présente invention vise à remédier à ces inconvénients en proposant un procédé de fabrication d'un tube renforcé en carton et métal, caractérisé en ce que ledit tube est obtenu par roulage convolute ou spiralé d'au moins une bande métallique épaisse préalablement contrecollée sur au moins une bande de carton.The present invention aims to remedy these drawbacks by proposing a method of manufacturing a reinforced cardboard and metal tube, characterized in that said tube is obtained by convolute or spiral rolling of at least one thick metal strip previously laminated on to the minus a strip of cardboard.
La bande métallique épaisse contrecollée sur la bande de carton constitue une barrière mécanique procurant une excellente résistance au feu et à l'humidité, ainsi qu'une résistance à l'éclatement et à l'écrasement particulièrement élevée. On notera que la bande métallique épaisse utilisée selon l'invention est très différente des films métalliques minces et ductiles, notamment d'aluminium, qui sont normalement employés, seuls ou en combinaison avec du polyéthylène ou du papier, pour améliorer l'étanchéité des tubes en carton ; en effet, l'épaisseur des films minces utilisés comme barrière d'étanchéité ne dépasse pas quelques dizaines de micromètres, un tel film d'aluminium ne pouvant ainsi contribuer en aucune manière à la rigidité de l'ensemble.The thick metal strip laminated to the cardboard strip constitutes a mechanical barrier providing excellent resistance to fire and humidity, as well as a particularly high resistance to bursting and crushing. It will be noted that the thick metallic strip used according to the invention is very different from thin and ductile metallic films, in particular aluminum, which are normally used, alone or in combination with polyethylene or paper, to improve the sealing of the tubes. cardboard-based ; the thickness of the thin films used as a sealing barrier does not exceed a few tens of micrometers, such an aluminum film can not contribute in any way to the rigidity of the assembly.
Selon l'invention, le collage préalable d'une bande de carton sur une bande métallique peut être effectuée juste avant leur roulage ou pas. Ainsi, dans une première variante, la fabrication d'un tube renforcé nécessite d'effectuer les opérations successives suivantes :
- a) collage d'un feuillard métallique, tel que de l'acier plus ou moins écroui, sur une feuille de carton de mêmes dimensions,
- b) refente du complexe métal/carton obtenu, par exemple après constitution de rouleaux dans lesquels sont découpées radialement des galettes selon une inclinaison et une largeur adaptées aux conditions du roulage,
- c) installation des galettes ou bobines d'au moins une bande d'un complexe métal/carton sur les dévidoirs d'une machine de roulage de tubes, par exemple une spiraleuse,
- d) installation des galettes ou bobines d'au moins une bande externe de maintien en carton,
- e) roulage desdites bandes en bord à bord ou à recouvrement partiel suivant l'utilisation finale des tubes,
- f) éventuellement, tronçonnage des tubes en continu.
- a) bonding of a metal strip, such as more or less work hardened steel, onto a sheet of cardboard of the same dimensions,
- b) slitting of the metal / cardboard complex obtained, for example after constitution of rolls from which wafers are cut radially at an inclination and a width adapted to the rolling conditions,
- c) installation of wafers or coils of at least one strip of a metal / cardboard complex on the reels of a tube rolling machine, for example a spiraling machine,
- d) installation of wafers or coils of at least one external cardboard retaining strip,
- e) rolling said strips edge to edge or partially overlapping depending on the end use of the tubes,
- f) optionally, continuous cutting of the tubes.
La première étape, à savoir le collage d'un feuillard métallique sur au moins une feuille de carton est délicate et doit être effectuée dans des conditions bien contrôlées ; en particulier, il convient d'utiliser des colles à chaud réactivées au moment du contrecollage des deux matériaux, par exemple des résines polymérisables, des dextrines, ou encore des holt-melts. Le choix de la température de collage se fait en fonction de la colle utilisée qui dépend surtout du type de carton plutôt que de la nature du feuillard métallique ; il convient également d'exercer une forte pression sur chaque face du complexe carton/métal pendant le collage, cette pression étant fournie par des cylindres superposés entre lesquels passe le complexe et dont l'écartement est réglable.The first step, namely the bonding of a metal strip on at least one sheet of cardboard is delicate and must be carried out under well-controlled conditions; in particular, it is advisable to use hot glues reactivated when laminating the two materials, for example polymerizable resins, dextrins, or holt-melts. The choice of bonding temperature is made according to the glue used, which mainly depends on the type of cardboard rather than the nature of the metal strip; it is also advisable to exert a strong pressure on each face of the cardboard / metal complex during bonding, this pressure being supplied by cylinders superposed which pass the complex and whose spacing is adjustable.
Un avantage essentiel de cette première variante de l'invention consiste en ce que les bandes réalisées par refente des feuilles de complexe carton/métal, présentées en rouleaux sous des cisailles circulaires traditionnelles, peuvent être assez facilement montées sur les machines de roulage existantes sans grande modification de ces dernières ; à cet égard, il convient uniquement de modifier, sur une spiraleuse, le système de transfert des bobines sur le magasin de la machine, le système de tension des bandes, les organes de tronçonnage des tubes en continu, et en particulier les couteaux circulaires et leur pression de coupe.An essential advantage of this first variant of the invention is that the strips produced by slitting sheets of cardboard / metal complex, presented in rolls under traditional circular shears, can be fairly easily mounted on existing rolling machines without much modification of the latter; in this regard, it is only necessary to modify, on a spiraling machine, the system for transferring the reels to the machine magazine, the system for tensioning the belts, the continuous cutting members for the tubes, and in particular the circular knives and their cutting pressure.
Dans une seconde variante plus traditionnelle, les étapes a) à c) de la variante précédente sont supprimées et remplacées par un contrecollage direct des deux bandes de carton et de métal sur la machine de roulage ; dans ce cas, des galettes de carton et des galettes d'une bande métallique sont installées séparément sur les dévidoirs de la machine, puis les bandes sont enduites d'une colle appropriée et enfin contrecollées par pressage à chaud. A la sortie des rouleaux presseurs, la bande du complexe carton/métal qui vient juste d'être réalisée s'enroule sur le mandrin de la machine de roulage dans des conditions identiques à celles des étapes d) à f) de la première variante.In a second more traditional variant, steps a) to c) of the previous variant are omitted and replaced by direct lamination of the two strips of cardboard and metal on the rolling machine; in this case, cardboard wafers and wafers of a metal strip are installed separately on the reels of the machine, then the strips are coated with an appropriate glue and finally laminated by hot pressing. At the outlet of the pressure rollers, the strip of the cardboard / metal complex which has just been produced is wound on the mandrel of the rolling machine under conditions identical to those of steps d) to f) of the first variant.
D'autres caractéristiques du procédé de fabrication de tube renforcé en carton et métal conforme à l'invention ressortiront mieux de la description qui va suivre de plusieurs modes d'exécution dudit procédé donnés à titre d'exemples non limitatifs en référence aux dessins annexés sur lesquels :
- la figure 1 est une vue en perspective d'un tube spiralé à partir d'une bande carton extérieure et d'une bande carton/métal intérieure conformément à l'invention,
- la figure 2 est une coupe transversale du tube ainsi réalisé.
- FIG. 1 is a perspective view of a spiral tube from an outer cardboard strip and an inner cardboard / metal strip in accordance with the invention,
- Figure 2 is a cross section of the tube thus produced.
Par la suite, on ne décrira pas à nouveau les techniques de collage employées pour contrecoller un feuillard métallique sur une feuille de carton, ou une bande de carton sur une bande de métal, mais on se placera directement à l'étape du roulage de bandes de complexe carton/métal préalablement obtenues, que ce soit juste avant ce roulage ou longtemps auparavant.Subsequently, we will not describe again the bonding techniques used to laminate a metal strip on a sheet of cardboard, or a cardboard strip on a metal strip, but we will go directly to the tape rolling step. of cardboard / metal complex previously obtained, either just before this rolling or a long time before.
Suivant une première variante d'exécution représentée en figure 1, un tube renforcé selon l'invention peut comporter une bande 1 de complexe carton/métal dont la face métallique 2 soit tournée vers l'intérieur dudit tube. Cette bande 1 est spiralée en bord à bord pour constituer un tube continu, pratiquement lisse sur sa face interne. Elle est maintenue par une ou plusieurs bandes externes 3 en carton, de même largeur que celle de la bande 1 de complexe carton/métal. La ou les bandes externes 3 sont spiralées à spires jointives autour de la bande 1 avec un décalage axial préférentiellement égal à la moitié de ladite largeur. Entre la face cartonnée 4 du complexe carton/acier, ici tournée vers l'extérieur, et la face interne 5 de la bande externe 3 constituée de carton uniquement, le collage s'effectue dynamiquement d'une manière classique au moyen de colles telles que celles déjà mentionnées ; les conditions de collage sont parfaitement connues de l'homme de métier et on doit notamment régler la viscosité des colles, la température de collage ainsi que la pression s'exerçant sur les deux bandes 1 et 3.According to a first alternative embodiment shown in FIG. 1, a reinforced tube according to the invention can comprise a strip 1 of cardboard / metal complex, the
Sur la coupe de la figure 2, on a représenté le feuillard métallique interne 2 à l'extérieur duquel sont collées, d'une part, la bande de carton 4 du complexe et, d'autre part, la bande externe 3 en carton qui sert à maintenir l'ensemble du tube.In the section of Figure 2, there is shown the
Selon une autre variante de la présente invention, non représentée sur les figures, on roule une première bande en carton sur le mandrin d'une machine de roulage tout en collant sur cette première bande une bande de complexe carton/métal, la face en carton étant tournée vers le mandrin ; de cette façon, on obtient des tubes avec une face externe métallique et une face interne en carton. Ici encore, le roulage des bandes interne et externe s'effectue avec un décalage préférentiel d'une demie largeur.According to another variant of the present invention, not shown in the figures, a first cardboard strip is rolled on the mandrel of a rolling machine while gluing on this first strip a strip of cardboard / metal complex, the cardboard face being turned towards the mandrel; in this way, tubes are obtained with an external metallic face and an internal cardboard face. Here again, the rolling of the internal and external strips is carried out with a preferential offset of half a width.
Selon encore une autre variante de l'invention, on présente sur le mandrin de la spiraleuse une première bande du complexe carton/métal avec sa face métallique tournée vers l'intérieur, sur laquelle on vient coller, avec un décalage d'une demie largeur, une seconde bande du complexe carton/métal, la face métallique étant cette fois tournée vers l'extérieur. Par cette technique, on réalise un tube renforcé ayant ses faces interne et externe métalliques.According to yet another variant of the invention, there is presented on the mandrel of the spiraling machine a first strip of the cardboard / metal complex with its metal face facing inwards, on which one has just stuck, with an offset of half a width. , a second strip of the cardboard / metal complex, the metal face this time facing outwards. By this technique, a reinforced tube is made having its internal and external metallic faces.
Bien entendu, on peut fabriquer des tubes carton/métal dont Tes spires successives se chevauchent avec la même facilité que pour fabriquer des tubes lisses. Toutes les combinaisons entre une bande interne à chevauchement, en carton ou en complexe carton/métal, et une bande externe, en carton ou en complexe carton/métal, sont également envisageables et leur mise en oeuvre dépend de l'application visée.Of course, it is possible to manufacture cardboard / metal tubes whose successive turns overlap with the same ease as for manufacturing smooth tubes. All the combinations between an internal overlapping strip, made of cardboard or a cardboard / metal complex, and an external strip, made of cardboard or a cardboard / metal complex, are also conceivable and their implementation depends on the intended application.
On peut tout aussi bien réaliser des tubes conformes au procédé de l'invention autrement que par roulage spiralé, en combinant par exemple un roulage spiralé de la bande du complexe carton/métal et un roulage parallèle de la bande de maintien en carton. Il est également possible de prévoir plusieurs bandes internes ou externes de maintien en carton.It is just as possible to produce tubes in accordance with the process of the invention other than by spiral rolling, for example by combining a spiral rolling of the strip of the cardboard / metal complex and a parallel rolling of the holding strip of cardboard. It is also possible to provide several internal or external cardboard holding bands.
Un tube renforcé selon l'invention, par exemple à partir d'une bande 1 du complexe constituée d'une bande métallique 2 en acier écroui de 15 centièmes de millimètres contrecollée sur une bande de carton 4 de 40 centièmes de millimètres, cette bande 1 de complexe carton/métal étant maintenue par une bande externe 3 de carton de 40 centièmes également, présente une épaisseur finale d'environ 1,25 millimètres (la différence venant des épaisseurs de colles) et possède une résistance à l'éclatement supérieure à celle d'un tube en carton uniquement dont l'épaisseur serait de 5 millimètres (pour un diamètre de 50 millimètres). Le poids du tube selon l'invention est alors divisé par un facteur allant de 2 à 4 par rapport à celui du tube en carton ; ceci procure, en outre, un avantage important quant au transport desdits tubes.A reinforced tube according to the invention, for example from a strip 1 of the complex consisting of a
L'épaisseur de la bande métallique 2 de la bande 1 du complexe carton/métal peut être choisie, pour un acier plus ou moins écroui, dans un intervalle compris entre 15 et 200 centièmes de millimètres (fig.1). Une bande de carton 4 de 40 centièmes est suffisante dans la plupart des cas ; toutefois, il est toujours possible d'adapter cette épaisseur par le biais d'un doublement, voire d'un triplement de la couche de carton de maintien, c'est-à-dire par le roulage de plusieurs bandes externes 3 en carton.The thickness of the
Bien entendu, lorsqu'on constitue un tube carton/métal avec une face externe en carton, il est possible de procéder à son habillage d'une manière conventionnelle, par exemple par un papier d'emballage contrecollé avant refente du complexe en feuille, ou au moment du roulage. On peut également compléter le complexe formé en additionnant, sur le parement de la ou des couches de carton de maintien, voire de la bande de carton du complexe, des ensembles aluminium/papier, aluminium/papier/polyéthylène, etc..., ceci permettant de renforcer spécifiquement les propriétés décoratives ou de résistance au feu, à l'humidité ou encore aux gaz ; en particulier, un tel habillage pourrait être nécessaire lorsqu'on veut garantir la longévité du collage métal/carton dans des conditions d'utilisation très oxydantes et/ou corrosives.Of course, when a cardboard / metal tube is formed with an outer cardboard face, it is possible to dress it in a conventional manner, for example with laminated wrapping paper before slitting the sheet complex, or when driving. One can also complete the complex formed by adding, on the facing of the layer or layers of cardboard holding, or even the cardboard strip of the complex, aluminum / paper, aluminum / paper / polyethylene, etc. assemblies, this allowing specific reinforcement of decorative properties or resistance to fire, humidity or even gases; in particular, such a covering could be necessary when it is wished to guarantee the longevity of the metal / cardboard bonding under very oxidizing and / or corrosive conditions of use.
Claims (7)
- Process for manufacturing a reinforced tube, particularly for pyrotechnical applications requiring a totally smooth inner wall resistant to high pressures and temperatures, obtained by spirally winding a complex (1) formed by a stack of at least one web of cardboard (4) and at least one band of metal (2), normally adhering to one another, characterized in that the thickness of the band of metal (2) being sufficient to resist bursting, spiral winding of the cardboard/metal complex (1) is effected edge to edge to obtain a continuous tube maintained by adhesion, inside or outside said tube, of at least one web (3) preferably of cardboard, spirally wound with contiguous turns, said turns being offset axially with respect to the turns of the complex (1).
- Process for manufacturing a reinforced tube according to Claim 1, characterized in that it is obtained by winding a web (1) of cardboard/metal complex of which the metal face (2) is turned towards the inside of said tube, said complex web (1) being maintained by one or more outer webs (3) of cardboard which are wound and glued on the cardboard face (4) of said complex.
- Process for manufacturing a reinforced tube according to Claim 1, characterized in that it is obtained by winding at least one inner web of cardboard on which is wound and glued the cardboard face of a web of cardboard/metal complex.
- Process for manufacturing a reinforced tube according to Claim 1, characterized in that it is obtained by winding a first web of cardboard/metal complex with its cardboard face turned towards the outside, on which is wound and glued the cardboard face of a second web of cardboard/metal complex.
- Reinforced tube of cardboard and metal, particularly for pyrotechnical applications requiring a totally smooth inner wall resistant to high pressures and temperatures, said tube being obtained by spirally winding a complex (1) formed by a stack of at least one web of cardboard (4) and at least one band of metal (2) normally adhering to one another, in accordance with the process according to any one of the preceding Claims, characterized in that the thickness of the band of metal (2) being sufficient to resist bursting, the tube is obtained by spirally winding the cardboard/metal complex (1) edge to edge so that said continuous tube thus obtained is maintained by gluing, inside or outside said tube, at least one web (3) preferably of cardboard, spirally wound with contiguous turns, said turns being offset axially with respect to the turns of the complex (1).
- Reinforced tube according to Claim 5, characterized in that the thickness of the band of metal (2) of the cardboard/metal complex (1) is greater than 0.15 millimeters.
- Reinforced tube according to either one of Claim 5 or 6, characterized in that the thickness of the band of cardboard (4) of the complex (1) is of the order of 0.40 millimeters, an additional reinforcement being able to be obtained by successive addition of an adequate number of glued webs (3).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9100512 | 1991-01-17 | ||
| FR9100512A FR2671780B1 (en) | 1991-01-17 | 1991-01-17 | PROCESS FOR THE MANUFACTURE OF A TUBE BY ROLLING A METAL STRIP LAMINATED ON A CARTON STRIP. |
| PCT/FR1992/000040 WO1992012902A1 (en) | 1991-01-17 | 1992-01-16 | Method for fabricating a tube by rolling a metal strip glued to a cardboard band |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0567580A1 EP0567580A1 (en) | 1993-11-03 |
| EP0567580B1 true EP0567580B1 (en) | 1994-10-12 |
Family
ID=9408790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92904851A Expired - Lifetime EP0567580B1 (en) | 1991-01-17 | 1992-01-16 | Method for fabricating a tube by rolling a metal strip glued to a cardboard band |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0567580B1 (en) |
| DE (1) | DE69200525D1 (en) |
| FR (1) | FR2671780B1 (en) |
| WO (1) | WO1992012902A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004039570A1 (en) * | 2002-10-30 | 2004-05-13 | Sanchez Renasco Jesus | Machine for the production of tubular bodies |
| ES2208106B1 (en) * | 2002-10-30 | 2005-10-01 | Jesus Sanchez Reñasco | MACHINE FOR THE MANUFACTURE OF TUBULAR BODIES. |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2948200A (en) * | 1958-01-13 | 1960-08-09 | Westerbarkey Lorenz | Method and apparatus for winding and cementing tubes or hose |
| FR1316315A (en) * | 1962-02-28 | 1963-01-25 | Robinson & Sons Ltd | Process for manufacturing coiled tubes and new industrial products, in particular cylindrical box bodies, obtained by its implementation |
| US3716435A (en) * | 1970-11-16 | 1973-02-13 | American Can Co | Method of making a container body |
| FR2427847A2 (en) * | 1978-06-08 | 1980-01-04 | Sireix Georges | DEVICE FOR BONDING MATERIALS IN STRIPS |
| DE3413619A1 (en) * | 1984-04-11 | 1985-10-24 | DVG Deutsche Verpackungsmittel GmbH, 8505 Röthenbach | Process for producing a packaging sleeve and packaging sleeve |
-
1991
- 1991-01-17 FR FR9100512A patent/FR2671780B1/en not_active Expired - Fee Related
-
1992
- 1992-01-16 WO PCT/FR1992/000040 patent/WO1992012902A1/en active IP Right Grant
- 1992-01-16 EP EP92904851A patent/EP0567580B1/en not_active Expired - Lifetime
- 1992-01-16 DE DE69200525T patent/DE69200525D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69200525D1 (en) | 1994-11-17 |
| FR2671780B1 (en) | 1994-10-28 |
| WO1992012902A1 (en) | 1992-08-06 |
| EP0567580A1 (en) | 1993-11-03 |
| FR2671780A1 (en) | 1992-07-24 |
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