EP0930964A1 - Rigid corrugated cardboard - Google Patents

Rigid corrugated cardboard

Info

Publication number
EP0930964A1
EP0930964A1 EP98924384A EP98924384A EP0930964A1 EP 0930964 A1 EP0930964 A1 EP 0930964A1 EP 98924384 A EP98924384 A EP 98924384A EP 98924384 A EP98924384 A EP 98924384A EP 0930964 A1 EP0930964 A1 EP 0930964A1
Authority
EP
European Patent Office
Prior art keywords
sided
ply
corrugated cardboard
double
cover
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Withdrawn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
EP98924384A
Other languages
German (de)
French (fr)
Inventor
Michel Harribey
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.)
Smurfit Worldwide Research Europe
Original Assignee
Smurfit Worldwide Research Europe
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 Smurfit Worldwide Research Europe filed Critical Smurfit Worldwide Research Europe
Publication of EP0930964A1 publication Critical patent/EP0930964A1/en
Withdrawn legal-status Critical Current

Links

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
    • B65D3/02—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 characterised by shape
    • B65D3/04—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 characterised by shape essentially cylindrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1007—Running or continuous length work
    • Y10T156/1016—Transverse corrugating

Definitions

  • the present invention relates to a method for manufacturing a rigid corrugated cardboard, a device for implementing the method and a corrugated cardboard obtained according to this method.
  • Corrugated cardboard is a complex material composed of two to seven sheets of paper. The leaves are called covers when they are outside and medians when they are inside.
  • grooves The grooved sheets which form the spacers and which are glued to the sheets mentioned above are called grooves.
  • a type of corrugated cardboard can be likened to a flexible structure.
  • This type of corrugated cardboard is single-sided corrugated cardboard called a single-sided sheet. This consists of a single-sided cover and a groove joined by dots of glue on the ridges of grooves in contact with the cover.
  • This cardboard has the advantage of being able to be curved at will, in particular rolled up, without being folded. It is also stored in rolls and used in particular as wedging, support for various panels.
  • a disadvantage of this cardboard is that it is not resistant since, by definition, it is not a profiled sandwich structure. It cannot therefore be directly used as part of a package and is limited in its applications.
  • all the other corrugated cardboard can be assimilated to a rigid structure. Mention may be made, for example, of double-sided corrugated cardboard made up of a glued groove inserted between a single-sided cover and a double-sided cover, or double-sided corrugated cardboard made up of two glued flutes inserted between two single-sided covers and a cover double sided. From their manufacture, they are cut into plates and are therefore, by definition flat.
  • corrugated cardboard They are resistant and can be used as part of a package, such as a box, the edges of which are the result of the fold lines of said cartons.
  • a disadvantage of this type of corrugated cardboard is that before it can be used as part of a package it must undergo one or more creasing, operation which consists in partially crushing along a line the entire thickness of the corrugated cardboard facilitate subsequent folding of the flaps.
  • the object of the present invention is then to overcome this drawback and therefore to propose a new method for manufacturing rigid corrugated cardboard which in particular makes it possible to obtain new curved shapes.
  • the invention relates to a method of manufacturing a rigid corrugated cardboard comprising, beforehand, a step of producing at least one single-sided sheet of given width by gluing a groove to a single-sided cover.
  • the following steps are carried out: a) the single-sided ply is bent to a desired shape, b) the edges of the groove of the curved single-sided ply are glued, c) at least one double-sided cover is glued same width as the single-sided ply on said single-sided ply so that it matches the curved shape of said ply.
  • the term “given width” should be understood to mean the dimension of the sheet in the cross direction.
  • curved shape should be understood to mean a shape which, seen in section perpendicular to the tops of the groove, defines a curved surface.
  • Such a method is of very simple implementation since it is directly applicable from all known types of cover, for example made of kraft-liner paper, test-liner and, this, whatever the grammage envisaged . It is also applicable from all kinds of known grooves (semi-chemical, wood, standard, ordinary) and this regardless of the profile considered (micro, small, medium, large groove). Finally, the bonding can be carried out using conventional glues of the starch or vinyl type.
  • this process makes it possible to offer packaging, in particular of small dimensions, which is both light and aesthetic.
  • these packages have a very advantageous mechanical strength / weight ratio compared to existing ones which include compact cardboard and / or parts of rigid corrugated corrugated cardboard.
  • step a) is carried out by closing the aforementioned single-face ply on itself.
  • the single-sided ply has a closed and curved shape.
  • a first variant of the invention consists, in a discontinuous manner, in cutting out a predetermined length of the single-face ply before bending it.
  • a ratio of the length of the double-sided cover to the length of the single-sided cover is determined so as to best adjust the superposition of the two covers between they.
  • an overlap may or may not be provided, the choice of such an overlap being guided by technical considerations (reinforcement of the curved assembly) and / or by aesthetic considerations.
  • the double-sided cover is advantageously cut before or after being bonded to the curved single-side sheet.
  • the whole of the rigid corrugated cardboard is cut continuously when bent.
  • an assembly of the closed rigid corrugated cardboard according to the invention is advantageously carried out with a flat part, in particular a compact or corrugated cardboard, intended to serve as the bottom.
  • the assembly is preferably carried out by mechanical means adaptable as a function of the size of the container and of the material of the attached flat part.
  • the mechanical means can be crimping, gluing or stapling in the case of corrugated or compact cardboard, plastic or wooden bottoms.
  • the invention also proposes a device for implementing the method.
  • This device includes:
  • the means for bending the single-sided sheet further comprise means for closing said sheet on itself.
  • the device comprises a device for cutting out a predetermined length of the single-sided sheet and advantageously comprises a device for cutting out the bonded double-sided cover.
  • the device comprises a device for cutting the curved rigid corrugated cardboard.
  • the curving means comprise a mold, the surface of which is advantageously depressed.
  • the single-sided sheet is easily applied against the mold which can be of relatively complex shape.
  • the means for applying the double-sided covering on the single-sided ply may comprise at least one counter-mold of complementary shape in a bending zone.
  • curvature zone it is necessary to understand here and in the rest of the text an zone where the concavity is turned towards the interior of the mold.
  • the device may advantageously include an assembly device with a flat piece intended to serve as the bottom.
  • the invention finally relates to a rigid corrugated cardboard obtained according to the preceding process.
  • This cardboard is characterized by the fact that the radius of curvature of the minimum single-sided ply is approximately equal to H - 0, 5 p, where H and p represent respectively the height and the pitch of the groove.
  • the invention uses as components all the usual known components and makes it possible to obtain new curved shapes of rigid corrugated cardboard. These have a structural rigidity quite comparable, if not greater, than that of known flat corrugated cardboard such as double-sided corrugated cardboard or double-sided cardboard.
  • the corrugated cardboard according to the invention can be used in particular as a barrel, crate, box, envelope.
  • FIG. 1 a perspective view of the lower part of a packaging box according to the invention
  • FIG. 2a and 2b a general elevational view of a first device according to the invention and a half view -cut along line AA of this same device
  • the box 1 has a side wall 2 with a rosette-shaped section 2.9 cm in height and below which is pasted a bottom 3 made of double-sided corrugated cardboard, the cover of which single-sided grammage equal to 1 40 g / m 2 is white top paper, type E flute and grammage equal to 1 40 g / m 2 is bleached kraft paper and double-sided cover grammage equal to 230 g / m 2 is printed white coated writing paper.
  • the side wall 2 is produced from a single-sided corrugated cardboard 21 curved in the shape of a rosette and on the groove of which a double-sided cover 22 is glued.
  • the covers and the groove of the side wall 2 have the same characteristics as those of the covers and the groove of the bottom 3.
  • the rosette comprises twelve concavities turned alternately inwards and outwards from the box 1.
  • box 1 One possible use of box 1 is the packaging of food products such as cheeses.
  • This device 4 which allowed the manufacture of the side wall 2 of the box 1.
  • This device 4 comprises a frame 5 on which is embedded a mold 6 in the form of a sleeve 1 m high with rosette section, the distance separating two opposite "external" concavities d being equal to 0.1 cm.
  • This mold 6 is pierced with orifices 7 which open into a groove interior 8 which extends to the frame 5 and which is connected to a vacuum device not shown.
  • the shaping of the single-sided sheet can thus be facilitated by this vacuum device.
  • Each bracket 1 1 is fixed to the circular plate 9 by means of two screws 1 2 and has in its lower part an axis 1 3 around which a hollow cylinder 1 4 of length substantially equal to the height of the sleeve 6 can pivot d 'a horizontal position to a vertical position in the extension of the bracket 1 1.
  • the device 4 also includes guide pads opposite the plate 9 (six in number in the case of FIGS. 2a and 2b) not shown, distributed uniformly over a circumference around the sleeve 6.
  • These guide pads are intended to engage simultaneously in the extension of the stirrups 1 1 to a distance equal to 1.5 mm from the sleeve 6 when the cylinders 1 4 are in the horizontal position.
  • a single-sided ply 21 of predetermined length exactly equal to the circumference of the sleeve 6 and of given width chosen substantially equal to the difference between the height of the sleeve 6 and the height of the stirrup 1 1, is positioned around this same sleeve 6.
  • the device for putting the interior groove under vacuum 8 can be started, which can cause the vacuum to be put under vacuum. the outer surface of the sleeve 6 through the openings 7.
  • the single-sided ply is, therefore, "pressed” against the sleeve 6 and therefore perfectly matches the shape of the latter.
  • the guide pads are then released and a gluing device, not shown, applies a dry vinyl or starch-based glue to the periphery of the curved single-sided sheet.
  • the vacuum device being always active.
  • the guide pads are reengaged, which makes it possible to run along the sleeve 6 on which the single-sided ply 21 is bent, a double-sided cover 22 of dimensions identical to the latter.
  • the cylinders 1 4 are lowered into a vertical position which, in contact with the double-sided cover 22, give it the corresponding internal concavities (C).
  • the vacuum device is then deactivated, the cylinders 1 4 are kept in the vertical position, the time required for bonding.
  • drying devices can be provided, for example by heating, along the sleeve 6.
  • the cardboard complex is now dry, it suffices to cut by cutting strips the number of side walls 2 necessary for the manufacture of the box 1.
  • This operation can be carried out for example using an arm equipped with a sharp blade and which “sweeps” the external surface at a speed such that the blade penetrates tangentially into each bending zone without risk of tearing the complex hardcover. It can also be performed using a laser. It is obvious that in this embodiment, the single-sided ply
  • Figures 3a and 3b which must be connected by making the lines B -B and CC coincide, show a general elevation view of a second device according to the invention capable of being used continuously with part of a device for manufacture of double-sided corrugated cardboard.
  • FIG. 3b For the sake of clarity and to facilitate understanding, the part of the device in FIG. 3b corresponding to the device according to the invention is shown on a larger scale than that of Figure 3a.
  • This part comprises a coil 30 of a single-sided sheet of corrugated cardboard 21 and a reel 40 of double-sided cover 22.
  • the single-sided sheet 21 and the double-sided cover 22 are of the same width.
  • the essential difference which exists between this part and an upstream part of a known machine for manufacturing double-sided corrugated cardboard lies in the fact that the two above-mentioned coils 30, 40 are offset relative to each other by approximately half of the width transversely to the respective travel axes 31, 41 of the single-sided sheet and of the double-sided cover.
  • the single-sided ply 21 is driven by a crenellated drum 32, controlled by a motor-variator and having the axial grooves in which fit the grooves of the corrugated cardboard.
  • a counter-roller 33 keeps the sheet in contact with the crenellated cardboard.
  • the sheet is then wound on a roller 34 arranged in such a way that the sheet only applies over a fraction of a turn of the drum.
  • the double-sided ply for its part, is introduced between two drive rollers 42, 43 also controlled by a motor-variator.
  • the bar feeder 35 comprises two fixed rollers 36, 37 around which the single-sided ply passes, forming a vertical loop, the end of which is wound on a freely suspended drum 38.
  • the drum 38 moves vertically between a low position and a high position illustrated respectively in solid lines and in dashed lines in FIG. 3a.
  • the single-sided ply 21 is then wound up on a servo drum whose role will be explained below, then it passes through a gluing device 50 controlled by a drive motor , not shown.
  • This drum should be as light as possible so that its inertia does not generate excessive acceleration or deceleration effects. It takes glue by bubbling into a tank 51, the surplus being removed by a wringing roller 52 A pressing counter-roller 53 applies the single-sided ply 21 against the sizing drum 53. The grooves of the single ply face are thus glued.
  • the servo drum 39 drives the motor of the sizing drum 53 so as to drive it at the same speed as that of travel of the single-sided sheet.
  • the tablecloth would slide on the sizing drum and "wipe" the glue without impregnating it.
  • Different known control systems 39 can be used.
  • the servo-drum can be provided on its periphery with a notched disc of small width, which meshes in the grooves of the sheet and which is therefore driven at a speed perfectly synchronous with that of the sheet.
  • This disc drives an optical encoder providing the servo frequency for controlling the drive motor of the sizing drum.
  • FIG. 3b it can be seen that the single-sided sheet thus glued and the double-sided cover engage in an offset manner on the sleeve 6 with rosette section identical to that shown in FIGS. 2a and 2b.
  • the axis of this sleeve 6 is inclined and forms an angle ⁇ with the axis of travel of the single-sided ply and of the double-sided cover and is in rotation at a speed corresponding to the linear drive speeds V, and V 2 mentioned above, using a variable speed motor not shown and located on the side of the reader.
  • the angle ⁇ is in any case sufficiently small so as to allow the edge-to-edge positioning of the single-sided ply 21 at each rotation rotation carried out by the sleeve 6.
  • the angle of inclination ⁇ of the sleeve 6 can obviously be different, knowing that it must remain within limits such that the extensibility limit of the single-sided ply 21 is not reached. In addition, it depends also the value of the transverse offset chosen between the two coils of components of the corrugated board.
  • this angle of inclination which is therefore equal to the angle formed by the line of the tops of the groove and the axis of revolution of the sleeve 6, must be less than or equal to 45 °.
  • This sleeve 6 is further provided throughout its range with a multitude of orifices not shown, identical to the orifices 1 1 in FIG. 2a.
  • the orifices open into a groove of the cylindrical type, itself connected to a vacuum device of the vacuum pump type located on the side of the reader and not shown, which therefore "plates" the single-sided sheet 21 against the sleeve 6.
  • the vacuum is in any case sufficiently low to allow the single-sided ply 21 to "run through” the sleeve 6 by forming a helix 60.
  • This propeller 60 is covered with the double-sided cover 22 which is therefore pressed against it and adhered thereto, once the "offset" has been caught up by means not shown.
  • These means are mechanical of the roller type whose shape is exactly complementary to that of the concavities of the sleeve 6 and / or of the pneumatic means of the pressurized enclosure type.
  • Drying devices for example by electric heating, not shown are provided along the sleeve and therefore facilitate the drying of this cardboard complex thus formed.
  • the complex passes through a rotary shearing device 70 of shape exactly complementary to the sleeve and consisting for example of a hard steel blade intended to shear the cardboard complex into several straight lateral bands 23 each having an equal width to the side wall 2 of the box 1 to be manufactured, such as that shown in FIG. 1.
  • the axis of the shearing device must itself be exactly parallel to the axis of rotation of the sleeve 6 and have the same linear speed as the speed of movement of the single web. face.
  • the cardboard lateral strips 23 thus cut out from the sleeve 6 and are stacked in boxes 80 with a movable bottom 81 located at the rear.
  • the manufacture of a box 2 according to the invention ends with an operation of gluing a side strip on a bottom.
  • the sleeves of the two devices according to the invention which have just been described can obviously take various forms such as a cylindrical sleeve or a sleeve with an ellipsoidal base, the length of the sleeve necessarily being greater than the width of the single-sided ply .
  • the synchronization between the rotation speed and the respective linear speeds of travel of the single-sided sheet and of the double-sided cover is an important element which it is essential to control, otherwise the cardboard complex does not have the desired shape and, worse still, its manufacture is doomed to failure.
  • the manufacturing devices described above make it possible to have access to packaging, in particular of small size, which is at the same time aesthetic, light and robust. This last characteristic is particularly highlighted using the comparative curves of FIG. 4. These are obtained from a crushing test which makes it possible to measure the compressive strength on edge, parallel to the edge of the groove and therefore allows to appreciate the dynamic compression.
  • the tests were carried out using a device of the compressometer type from the company L&W which comprises two plates approaching at constant speed perpendicular to the groove.
  • the resistance to crushing measurement then consists in recording the force measured in daN supplied by the plates as a function of the deformation of the test piece placed between these plates measured in millimeters.
  • the curve in dotted lines in FIG. 4 relates to a wall 1 30 mm high with rectangular section, 1 80 mm long and 75 mm wide made from a double flat corrugated cardboard which has been grooved and then glued with vinyl glue, as a comparative example.
  • This double-sided flat corrugated cardboard has a single-sided sheet whose single-sided cover of grammage equal to 1 50 g / m 2 in kraft paper is associated with a type C groove of grammage equal to 1 20 g / m 2 in VP paper and a double-sided cover of grammage equal to 200 g / m 2 in kraft paper.
  • the curve in solid line in FIG. 4 relates to a cylinder of corrugated cardboard produced according to the invention of 1 30 mm in height and with a diameter equal to 1 65 mm, the bonding having also been carried out using a vinyl adhesive. .
  • the characteristics of the components of this carton are strictly identical to those defined above
  • the weight of the two boxes is substantially identical and is equal to 38.2 g.
  • the elastic limits are substantially identical, the buckling rupture of the cardboard is absolutely avoided in the case of the specific structure according to the invention and there is therefore a certain "damping" effect in addition to a much better toughness. It can therefore be concluded that, for an identical weight, the resistance to longevity under stress provides a package with a given capacity with superior performance in the case where it is manufactured according to the invention.
  • the packaging according to the invention will tend, in the event of too high a load, to gradually collapse instead of giving way suddenly, which is advantageous when the fragile and expensive contents are to be recovered. , for example, perishable goods, before crushing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Laminated Bodies (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Abstract

The invention concerns a method for making a rigid corrugated cardboard, comprising, a preliminary step of producing at least a single faced ply (21) of given length by gluing a flute to a single faced cover. The invention is characterised in that it consists in the following steps: a) bending the single faced ply (21) according to a desired shape; b) gluing the bent single faced ply flute tops; c) gluing at least a double faced cover (22) of the same width as the single faced ply on the single faced ply (21) such that it matches the said ply bent shape. The invention also concerns a device for implementing the method and the rigid corrugated cardboard obtained by the method.

Description

CARTON ONDULE RIGIDE RIGID CORRUGATED BOARD
La présente invention concerne un procédé de fabrication d'un carton ondulé rigide, un dispositif de mise en oeuvre du procédé et un carton ondulé obtenu selon ce procédé.The present invention relates to a method for manufacturing a rigid corrugated cardboard, a device for implementing the method and a corrugated cardboard obtained according to this method.
Elle s'applique plus particulièrement aux cartons nécessaires à la fabrication d'emballages ou de conditionnements. Le carton ondulé, bien connu de l'homme de l'art, est un matériau complexe composé de deux à sept feuilles de papier. Les feuilles sont dénommées couvertures lorsqu'elles sont extérieures et médianes lorsqu'elles sont intérieures.It applies more particularly to the boxes necessary for the manufacture of packaging or packaging. Corrugated cardboard, well known to those skilled in the art, is a complex material composed of two to seven sheets of paper. The leaves are called covers when they are outside and medians when they are inside.
Les feuilles cannelées qui forment les entretoises et qui sont collées aux feuilles mentionnées ci-dessus sont dénommées cannelures.The grooved sheets which form the spacers and which are glued to the sheets mentioned above are called grooves.
On peut, en fait, de manière non limitative, classer les cartons ondulés connus en deux catégories :We can, in fact, without limitation, classify known corrugated cardboard into two categories:
- d'une part, un type de carton ondulé peut être assimilé à une structure souple. Ce type de carton ondulé est le carton ondulé simple face appelé nappe simple face. Celle-ci est constituée d'une couverture simple face et d'une cannelure solidarisées par des points de colle sur les crêtes de cannelures en contact avec la couverture.- on the one hand, a type of corrugated cardboard can be likened to a flexible structure. This type of corrugated cardboard is single-sided corrugated cardboard called a single-sided sheet. This consists of a single-sided cover and a groove joined by dots of glue on the ridges of grooves in contact with the cover.
Ce carton présente l'avantage de pouvoir être incurvé à souhait, notamment enroulé, sans être plié. Il est d'ailleurs stocké en rouleaux et utilisé notamment comme calage, support pour panneaux divers.This cardboard has the advantage of being able to be curved at will, in particular rolled up, without being folded. It is also stored in rolls and used in particular as wedging, support for various panels.
Un inconvénient de ce carton est qu'il n'est pas résistant puisque, par définition, il n'est pas une structure sandwich profilée. Il ne peut donc être directement utilisé comme partie d'un emballage et est limité dans ses applications. - d'autre part, tous les autres cartons ondulés peuvent être assimilés à une structure rigide. On peut citer par exemple le carton ondulé double face constitué d'une cannelure collée et intercalée entre une couverture simple face et une couverture double face, ou le carton ondulé double face constitué de deux cannelures collées et intercalées entre deux couvertures simple face et une couverture double face. Dès leur fabrication, ils sont découpés en plaques et sont donc, par définition plats. Ils sont résistants et peuvent être utilisés comme parties d'un emballage, tel qu'une caisse, dont les arêtes sont les résultantes des lignes de pliage desdits cartons. Un inconvénient de ce type de carton ondulé est qu'avant de pouvoir être utilisé comme partie d'un emballage il doit subir un ou plusieurs rainage(s), opération qui consiste à écraser partiellement suivant une ligne toute l'épaisseur du carton ondulé pour faciliter le pliage ultérieur des rabats.A disadvantage of this cardboard is that it is not resistant since, by definition, it is not a profiled sandwich structure. It cannot therefore be directly used as part of a package and is limited in its applications. - on the other hand, all the other corrugated cardboard can be assimilated to a rigid structure. Mention may be made, for example, of double-sided corrugated cardboard made up of a glued groove inserted between a single-sided cover and a double-sided cover, or double-sided corrugated cardboard made up of two glued flutes inserted between two single-sided covers and a cover double sided. From their manufacture, they are cut into plates and are therefore, by definition flat. They are resistant and can be used as part of a package, such as a box, the edges of which are the result of the fold lines of said cartons. A disadvantage of this type of corrugated cardboard is that before it can be used as part of a package it must undergo one or more creasing, operation which consists in partially crushing along a line the entire thickness of the corrugated cardboard facilitate subsequent folding of the flaps.
Ces deux catégories de carton ondulé ont donc chacune leurs caractéristiques propres étroitement liées, à savoir la souplesse et la courbure pour la première de ces catégories, la rigidité et la planéité pour la deuxième.These two categories of corrugated cardboard therefore each have their own closely related characteristics, namely flexibility and curvature for the first of these categories, rigidity and flatness for the second.
Il est connu de la demande de brevet FR 2 668 099 un procédé de fabrication d'une coquille à alvéoles semi-cylindriques faite d'un carton ondulé, coquille qui peut donc être assimilée à une troisième catégorie de carton ondulé puisqu'à la fois rigide et courbe. Ce procédé consiste à coller une feuille de couverture double face sur les cannelures d'un bande de carton ondulé simple face en une zone où la bande est déjà cintrée sur un rouleau. Un tel procédé est avantageux car, effectué en continu sur ligne industrielle, il permet d'avoir un débit de coquilles important. Les coquilles obtenues sont peu onéreuses, légères et robustes et leur usage s'avère être d'une grande simplicité.It is known from patent application FR 2 668 099 a process for manufacturing a semi-cylindrical cell shell made of corrugated cardboard, a shell which can therefore be assimilated to a third category of corrugated cardboard since at the same time rigid and curved. This process consists of gluing a double-sided cover sheet on the grooves of a strip of single-sided corrugated cardboard in an area where the strip is already bent on a roll. Such a process is advantageous because, carried out continuously on an industrial line, it makes it possible to have a high flow rate of shells. The shells obtained are inexpensive, light and robust and their use turns out to be very simple.
Cependant les applications de telles coquilles sont restreintes par une géométrie très particulière et se cantonnent par exemple au calage d'objets cylindriques, notamment de bouteilles couchées dans une caisse d'emballage. Le but de la présente invention est alors de pallier à cet inconvénient et donc de proposer un nouveau procédé de fabrication de carton ondulé rigide qui permette notamment d'obtenir des formes nouvelles incurvées.However, the applications of such shells are restricted by a very particular geometry and are confined, for example, to the wedging of cylindrical objects, in particular of bottles lying in a packing case. The object of the present invention is then to overcome this drawback and therefore to propose a new method for manufacturing rigid corrugated cardboard which in particular makes it possible to obtain new curved shapes.
Pour ce faire, l'invention a pour objet un procédé de fabrication d'un carton ondulé rigide comprenant, au préalable, une étape de production d'au moins une nappe simple face de largeur donnée par collage d'une cannelure à une couverture simple face. Selon l'invention on réalise les étapes suivantes : a) on cintre selon une forme désirée la nappe simple face, b) on encolle les sommets de la cannelure de la nappe simple face cintrée, c) on colle au moins une couverture double face de même largeur que la nappe simple face sur ladite nappe simple face de manière à ce qu'elle épouse la forme cintrée de ladite nappe. Dans le contexte de l'invention, il faut comprendre par « largeur donnée », la dimension de la nappe dans le sens travers. De même, il faut comprendre par « forme cintrée», une forme qui vue en coupe perpendiculairement aux sommets de la cannelure définit une surface courbe.To do this, the invention relates to a method of manufacturing a rigid corrugated cardboard comprising, beforehand, a step of producing at least one single-sided sheet of given width by gluing a groove to a single-sided cover. According to the invention, the following steps are carried out: a) the single-sided ply is bent to a desired shape, b) the edges of the groove of the curved single-sided ply are glued, c) at least one double-sided cover is glued same width as the single-sided ply on said single-sided ply so that it matches the curved shape of said ply. In the context of the invention, the term “given width” should be understood to mean the dimension of the sheet in the cross direction. Likewise, “curved shape” should be understood to mean a shape which, seen in section perpendicular to the tops of the groove, defines a curved surface.
Un tel procédé est d'une mise en oeuvre très simple puisqu'il est directement applicable à partir de tous les types connus de couverture, par exemple faites en papier kraft-liner, test-liner et, ceci, quel que soit le grammage envisagé. Il est également applicable à partir de toutes les sortes de cannelures connues (mi-chimique, bois, standard, ordinaire) et, ceci quel que soit le profil considéré (micro, petite, moyenne, grande cannelure). Enfin, le collage peut être effectué à partir de colles usuelles du type amidon ou vinylique.Such a method is of very simple implementation since it is directly applicable from all known types of cover, for example made of kraft-liner paper, test-liner and, this, whatever the grammage envisaged . It is also applicable from all kinds of known grooves (semi-chemical, wood, standard, ordinary) and this regardless of the profile considered (micro, small, medium, large groove). Finally, the bonding can be carried out using conventional glues of the starch or vinyl type.
De plus, ce procédé permet de proposer des emballages notamment de faibles dimensions, à la fois légers et esthétiques. A structure équivalente, ces emballages présentent un ratio résistance mécanique/poids très avantageux par rapport à ceux existants qui comportent du carton compact et/ou des parties de carton ondulé rigide rainé.In addition, this process makes it possible to offer packaging, in particular of small dimensions, which is both light and aesthetic. With an equivalent structure, these packages have a very advantageous mechanical strength / weight ratio compared to existing ones which include compact cardboard and / or parts of rigid corrugated corrugated cardboard.
Enfin, selon ce procédé, on peut créer directement la paroi d'un contenant du type boîte dont la section peut comporter de multiples concavités tournées alternativement vers l'intérieur de la section et vers l'extérieur. Par exemple, on peut obtenir une paroi en carton ondulé à section rosace.Finally, according to this method, it is possible to directly create the wall of a container of the box type, the section of which can include multiple concavities which rotate alternately towards the inside of the section and towards the outside. For example, one can obtain a corrugated wall with a rosette section.
Selon une caractéristique très avantageuse de l'invention, on réalise l'étape a) en fermant la nappe simple face précitée sur elle-même. Selon cette caractéristique, la nappe simple face a une forme fermée et cintrée.According to a very advantageous characteristic of the invention, step a) is carried out by closing the aforementioned single-face ply on itself. According to this characteristic, the single-sided ply has a closed and curved shape.
Une première variante de l'invention consiste, de manière discontinue, à effectuer le découpage d'une longueur prédéterminée de la nappe simple face avant de la cintrer.A first variant of the invention consists, in a discontinuous manner, in cutting out a predetermined length of the single-face ply before bending it.
De préférence, avant d'effectuer le collage d'au moins une couverture double face, on détermine un rapport de la longueur de la couverture double face sur la longueur de la couverture simple face de manière à ajuster au mieux la superposition des deux couvertures entre elles. Ainsi, il peut être prévu ou non un chevauchement, le choix d'un tel chevauchement étant guidé par des considérations techniques (renfort de l'ensemble incurvé) et/ou par des considérations d'ordre esthétique.Preferably, before bonding at least one double-sided cover, a ratio of the length of the double-sided cover to the length of the single-sided cover is determined so as to best adjust the superposition of the two covers between they. Thus, an overlap may or may not be provided, the choice of such an overlap being guided by technical considerations (reinforcement of the curved assembly) and / or by aesthetic considerations.
En relation avec le découpage d'une longueur prédéterminée de la nappe simple face, on découpe avantageusement la couverture double face avant ou après l'avoir collée sur la nappe simple face cintrée.In relation to the cutting of a predetermined length of the single-sided sheet, the double-sided cover is advantageously cut before or after being bonded to the curved single-side sheet.
Selon une autre variante de l'invention, on découpe, de manière continue, l'ensemble du carton ondulé rigide une fois cintré.According to another variant of the invention, the whole of the rigid corrugated cardboard is cut continuously when bent.
Afin de réaliser le contenant du type boîte de manière complète, on effectue avantageusement un assemblage du carton ondulé rigide fermé selon l'invention avec une pièce plane, notamment un carton compact ou ondulé, destiné à servir de fond. L'assemblage est effectué de préférence par des moyens mécaniques adaptables en fonction de la taille du contenant et de la matière de la pièce plane rapportée. Les moyens mécaniques peuvent être le sertissage, le collage ou l'agrafage dans le cas de fonds en carton ondulé ou compact, en plastique, en bois.In order to make the box-type container completely, an assembly of the closed rigid corrugated cardboard according to the invention is advantageously carried out with a flat part, in particular a compact or corrugated cardboard, intended to serve as the bottom. The assembly is preferably carried out by mechanical means adaptable as a function of the size of the container and of the material of the attached flat part. The mechanical means can be crimping, gluing or stapling in the case of corrugated or compact cardboard, plastic or wooden bottoms.
L'invention propose également un dispositif de mise en oeuvre du procédé. Ce dispositif comporte :The invention also proposes a device for implementing the method. This device includes:
- des moyens pour cintrer la nappe simple face,- means for bending the single-sided sheet,
- des moyens pour encoller les sommets de la cannelure de la nappe simple face cintrée,means for gluing the tops of the groove of the curved single-face ply,
- des moyens pour appliquer au moins une couverture double face de même largeur que la nappe simple face, sur ladite nappe simple face cintrée.- Means for applying at least a double-sided cover of the same width as the single-sided ply, on said curved single-sided ply.
Avantageusement, les moyens pour cintrer la nappe simple face comportent en outre des moyens pour fermer ladite nappe sur elle-même.Advantageously, the means for bending the single-sided sheet further comprise means for closing said sheet on itself.
Selon une forme de réalisation, le dispositif comporte un dispositif de découpage d'une longueur prédéterminée de la nappe simple face et avantageusement comporte un dispositif de découpage de la couverture double face collée.According to one embodiment, the device comprises a device for cutting out a predetermined length of the single-sided sheet and advantageously comprises a device for cutting out the bonded double-sided cover.
Selon une autre forme de réalisation, le dispositif comporte un dispositif de découpage du carton ondulé rigide cintré.According to another embodiment, the device comprises a device for cutting the curved rigid corrugated cardboard.
Selon une variante préférée, les moyens d'incurvation comportent un moule dont la surface est mise avantageusement en dépression. Ainsi, la nappe simple face est facilement appliquée contre le moule qui peut être de forme relativement complexe.According to a preferred variant, the curving means comprise a mold, the surface of which is advantageously depressed. Thus, the single-sided sheet is easily applied against the mold which can be of relatively complex shape.
Lorsque le dispositif comporte un moule, les moyens d'application de la couverture double face sur la nappe simple face peuvent comporter au moins un contre-moule de forme complémentaire dans une zone d'incurvation. Par « zone d'incurvation », il faut comprendre ici et dans la suite du texte une zone où la concavité est tournée vers l'intérieur du moule.When the device comprises a mold, the means for applying the double-sided covering on the single-sided ply may comprise at least one counter-mold of complementary shape in a bending zone. By “curvature zone”, it is necessary to understand here and in the rest of the text an zone where the concavity is turned towards the interior of the mold.
Lorsque le carton ondulé rigide incurvé selon l'invention est destiné à servir de contenant, le dispositif peut avantageusement comporter un dispositif d'assemblage avec une pièce plane destinée à servir de fond . L'invention concerne enfin un carton ondulé rigide obtenu selon le procédé précédent. Ce carton se caractérise par le fait que le rayon de courbure de la nappe simple face minimal est approximativement égal à H - 0, 5 p, où H et p représentent respectivement la hauteur et le pas de la cannelure. Comme mentionné ci-dessus, l'invention utilise comme composants tous les composants usuels connus et permet d'obtenir des formes nouvelles incurvées de cartons ondulés rigides. Celles-ci présentent une rigidité de structure tout à fait comparable, sinon supérieure, à celle des cartons ondulés plats connus tels que le carton ondulé double-face ou le carton double-double face.When the rigid curved corrugated cardboard according to the invention is intended to serve as a container, the device may advantageously include an assembly device with a flat piece intended to serve as the bottom. The invention finally relates to a rigid corrugated cardboard obtained according to the preceding process. This cardboard is characterized by the fact that the radius of curvature of the minimum single-sided ply is approximately equal to H - 0, 5 p, where H and p represent respectively the height and the pitch of the groove. As mentioned above, the invention uses as components all the usual known components and makes it possible to obtain new curved shapes of rigid corrugated cardboard. These have a structural rigidity quite comparable, if not greater, than that of known flat corrugated cardboard such as double-sided corrugated cardboard or double-sided cardboard.
Le carton ondulé selon l'invention est utilisable notamment en tant que baril, caisse, boîte, enveloppe.The corrugated cardboard according to the invention can be used in particular as a barrel, crate, box, envelope.
D'autres détails et caractéristiques avantageuses de l'invention ressortent ci-après de la description détaillée d'exemples de réalisation de l'invention, faite en référence aux figures, qui représentent :Other details and advantageous features of the invention emerge below from the detailed description of exemplary embodiments of the invention, made with reference to the figures, which represent:
- figure 1 : une vue en perspective de la partie inférieure d'une boite d'emballage conforme à l'invention, - figures 2a et 2b : une vue générale en élévation d'un premier dispositif selon l'invention et une vue en demi-coupe selon la ligne A-A de ce même dispositif,- Figure 1: a perspective view of the lower part of a packaging box according to the invention, - Figures 2a and 2b: a general elevational view of a first device according to the invention and a half view -cut along line AA of this same device,
- figures 3a et 3b, qui doivent être raccordées en faisant coïncider les lignes B-B et C-C : une vue générale en élévation d'un deuxième dispositif selon l'invention apte à être utilisé en continu avec une partie d'un dispositif de fabrication de carton ondulé double face.- Figures 3a and 3b, which must be connected by making the lines BB and CC coincide: a general elevation view of a second device according to the invention capable of being used continuously with part of a cardboard manufacturing device double-sided corrugated.
En référence à la figure 1 , la boîte 1 présente une paroi latérale 2 à section en forme de rosace de 2,9 cm de hauteur et au-dessous de laquelle est collé un fond 3 fait d'un carton ondulé double face dont la couverture simple face de grammage égal à 1 40 g/m2 est en papier white top, la cannelure de type E et de grammage égal à 1 40 g/m2 est en papier kraft blanchi et la couverture double face de grammage égal à 230 g/m2 est en papier écriture blanc couché imprimé.With reference to FIG. 1, the box 1 has a side wall 2 with a rosette-shaped section 2.9 cm in height and below which is pasted a bottom 3 made of double-sided corrugated cardboard, the cover of which single-sided grammage equal to 1 40 g / m 2 is white top paper, type E flute and grammage equal to 1 40 g / m 2 is bleached kraft paper and double-sided cover grammage equal to 230 g / m 2 is printed white coated writing paper.
Comme on l'a expliqué précédemment, la paroi latérale 2 est réalisée à partir d'un carton ondulé simple face 21 incurvé en forme d'une rosace et sur la cannelure duquel est collée une couverture double face 22.As explained above, the side wall 2 is produced from a single-sided corrugated cardboard 21 curved in the shape of a rosette and on the groove of which a double-sided cover 22 is glued.
Les couvertures et la cannelure de la paroi latérale 2 ont les mêmes caractéristiques que celles des couvertures et de la cannelure du fond 3.The covers and the groove of the side wall 2 have the same characteristics as those of the covers and the groove of the bottom 3.
La rosace comporte douze concavités tournées alternativement vers l'intérieur et vers l'extérieur de la boite 1 .The rosette comprises twelve concavities turned alternately inwards and outwards from the box 1.
Une utilisation possible de la boite 1 est l'emballage de produits alimentaires tels que des fromages.One possible use of box 1 is the packaging of food products such as cheeses.
On décrit à présent, en référence aux figures 2a et 2b, le dispositif 4 qui a permis la fabrication de la paroi latérale 2 de la boite 1 . Ce dispositif 4 comporte un bâti 5 sur lequel est encastré un moule 6 sous la forme d'un manchon de 1 m de hauteur à section rosace, la distance séparant deux concavités « extérieures » opposées d étant égale à 1 0, 1 cm.We will now describe, with reference to FIGS. 2a and 2b, the device 4 which allowed the manufacture of the side wall 2 of the box 1. This device 4 comprises a frame 5 on which is embedded a mold 6 in the form of a sleeve 1 m high with rosette section, the distance separating two opposite "external" concavities d being equal to 0.1 cm.
Ce moule 6 est percé d'orifices 7 qui débouchent dans une gorge intérieure 8 qui se prolonge jusqu'au bâti 5 et qui est reliée à un dispositif de mise sous dépression non représenté. La mise en forme de la nappe simple face peut être ainsi facilitée par ce dispositif de mise sous dépression.This mold 6 is pierced with orifices 7 which open into a groove interior 8 which extends to the frame 5 and which is connected to a vacuum device not shown. The shaping of the single-sided sheet can thus be facilitated by this vacuum device.
Au-dessous de ce moule 6 est fixée une plaque circulaire 9 par l'intermédiaire de six vis 1 0 répartis uniformément sur un diamètre.Below this mold 6 is fixed a circular plate 9 by means of six screws 10 distributed uniformly over a diameter.
Sur la partie périphérique de la plaque circulaire 9 sont répartis de manière uniforme six étriers 1 1 .On the peripheral part of the circular plate 9 are uniformly distributed six stirrups 1 1.
Chaque étrier 1 1 est fixé à la plaque circulaire 9 par l'intermédiaire de deux vis 1 2 et comporte dans sa partie basse un axe 1 3 autour duquel un cylindre creux 1 4 de longueur sensiblement égaie à la hauteur du manchon 6 peut pivoter d'une position horizontale à une position verticale dans le prolongement de l'étrier 1 1 .Each bracket 1 1 is fixed to the circular plate 9 by means of two screws 1 2 and has in its lower part an axis 1 3 around which a hollow cylinder 1 4 of length substantially equal to the height of the sleeve 6 can pivot d 'a horizontal position to a vertical position in the extension of the bracket 1 1.
Le dispositif 4 comprend également des plots guideurs à l'opposé de la plaque 9 (au nombre de six dans le cas des figures 2a et 2b) non représentés, répartis uniformément sur une circonférence autour du manchon 6.The device 4 also includes guide pads opposite the plate 9 (six in number in the case of FIGS. 2a and 2b) not shown, distributed uniformly over a circumference around the sleeve 6.
Ces plots guideurs sont destinés à s'engager simultanément dans le prolongement des étriers 1 1 jusqu'à une distance égale à 1 , 5 millimètre du manchon 6 lorsque les cylindres 1 4 sont en position horizontale.These guide pads are intended to engage simultaneously in the extension of the stirrups 1 1 to a distance equal to 1.5 mm from the sleeve 6 when the cylinders 1 4 are in the horizontal position.
Le fonctionnement du dispositif 4 va maintenant être décrit en détail. A l'aide des plots guideurs engagés dans le prolongement des étriers 1 1 , une nappe simple face 21 de longueur prédéterminée exactement égale à la circonférence du manchon 6 et de largeur donnée choisie sensiblement égale à la différence entre la hauteur du manchon 6 et la hauteur de l'étrier 1 1 , est positionnée autour de ce même manchon 6. Une fois ce positionnement réalisé, le dispositif de mise sous dépression de la gorge intérieure 8 peut-être mis en marche, ce qui peut provoquer la mise sous dépression de la surface extérieure du manchon 6 par le biais des orifices 7.The operation of the device 4 will now be described in detail. Using the guide pads engaged in the extension of the stirrups 1 1, a single-sided ply 21 of predetermined length exactly equal to the circumference of the sleeve 6 and of given width chosen substantially equal to the difference between the height of the sleeve 6 and the height of the stirrup 1 1, is positioned around this same sleeve 6. Once this positioning has been carried out, the device for putting the interior groove under vacuum 8 can be started, which can cause the vacuum to be put under vacuum. the outer surface of the sleeve 6 through the openings 7.
La nappe simple face est, de ce fait, « plaquée » contre le manchon 6 et épouse donc parfaitement la forme de ce dernier. Les plots guideurs sont alors dégagés et un dispositif d'encollage non représenté, applique une colle sèche vinylique ou à base d'amidon sur le pourtour de la nappe simple face cintréeThe single-sided ply is, therefore, "pressed" against the sleeve 6 and therefore perfectly matches the shape of the latter. The guide pads are then released and a gluing device, not shown, applies a dry vinyl or starch-based glue to the periphery of the curved single-sided sheet.
21 , sur l'intégralité de sa hauteur, le dispositif de mise sous dépression étant toujours actif.21, over its entire height, the vacuum device being always active.
Une fois la colle bien imprégnée, les plots guideurs sont réengagés, ce qui permet de faire courir le long du manchon 6 sur lequel se trouve cintrée la nappe simple face 21 une couverture double face 22 de dimensions identiques à cette dernière.Once the glue is well impregnated, the guide pads are reengaged, which makes it possible to run along the sleeve 6 on which the single-sided ply 21 is bent, a double-sided cover 22 of dimensions identical to the latter.
Concomitamment au retrait des plots guideurs, les cylindres 1 4 sont abaissés en position verticale qui, en contact avec la couverture double face 22, lui donnent les concavités intérieures correspondantes (C) .Concomitantly with the withdrawal of the guide pads, the cylinders 1 4 are lowered into a vertical position which, in contact with the double-sided cover 22, give it the corresponding internal concavities (C).
Le dispositif de mise sous dépression est alors désactivé, les cylindres 1 4 sont maintenus en position verticale, le temps nécessaire au collage.The vacuum device is then deactivated, the cylinders 1 4 are kept in the vertical position, the time required for bonding.
Bien entendu pour accélérer le séchage de la colle, il peut être prévu des dispositifs de séchage, par exemple par chauffage, le long du manchon 6.Of course, to speed up the drying of the adhesive, drying devices can be provided, for example by heating, along the sleeve 6.
Le complexe cartonné étant désormais sec, il suffit de débiter par découpage de bandes le nombre de parois latérales 2 nécessaires à la fabrication de la boite 1 . Cette opération peut être réalisée par exemple à l'aide d'un bras équipé d'une lame tranchante et qui « balaie » la surface externe à une vitesse telle que la lame pénètre tangentiellement dans chaque zone d'incurvation sans risque de déchirer le complexe cartonné. Elle peut être également réalisée à l'aide d'un laser. II est bien évident que dans ce mode de réalisation, la nappe simple faceThe cardboard complex is now dry, it suffices to cut by cutting strips the number of side walls 2 necessary for the manufacture of the box 1. This operation can be carried out for example using an arm equipped with a sharp blade and which “sweeps” the external surface at a speed such that the blade penetrates tangentially into each bending zone without risk of tearing the complex hardcover. It can also be performed using a laser. It is obvious that in this embodiment, the single-sided ply
21 doit être découpée préalablement à son cintrage. La couverture double face21 must be cut prior to bending. The double sided blanket
22, quant à elle, peut être découpée préalablement à son collage, ou après. A l'aide de ce même dispositif 4, on peut bien évidemment réaliser le complexe cartonné sans mettre en marche le dispositif sous dépression. Par exemple, on peut d'abord réaliser l'encollage de la couverture double face 22 et faire l'étape de mise en forme uniquement par contact avec les cylindres 1 4 qui exercent une pression mécanique suffisante.22, on the other hand, can be cut before or after it is glued. Using this same device 4, it is obviously possible to produce the cardboard complex without starting the device under vacuum. For example, we can first glue the double-sided cover 22 and do the shaping step only by contact with the cylinders 1 4 which exert sufficient mechanical pressure.
Les figures 3 a et 3b, qui doivent être raccordées en faisant coïncider les lignes B -B et C-C montrent une vue générale en élévation d'un deuxième dispositif selon l'invention apte à être utilisé en continu avec une partie d'un dispositif de fabrication de carton ondulé double face.Figures 3a and 3b, which must be connected by making the lines B -B and CC coincide, show a general elevation view of a second device according to the invention capable of being used continuously with part of a device for manufacture of double-sided corrugated cardboard.
Par souci de clarté et pour faciliter la compréhension, la partie du dispositif de la figure 3b correspondant au dispositif selon l'invention est représentée à une échelle plus importante que celle de la figure 3a.For the sake of clarity and to facilitate understanding, the part of the device in FIG. 3b corresponding to the device according to the invention is shown on a larger scale than that of Figure 3a.
On décrit maintenant la partie du dispositif de la figure 3a quasiment identique à la partie amont d'une machine de fabrication de carton ondulé double face du type train onduleur, c'est-à-dire la partie située avant l'encolleuse.We will now describe the part of the device in FIG. 3a almost identical to the upstream part of a machine for manufacturing double-sided corrugated cardboard of the inverter train type, that is to say the part situated before the gluing machine.
Cette partie comprend une bobine 30 d'une nappe simple face de carton ondulé 21 et une bobine 40 de couverture double face 22. La nappe simple face 21 et la couverture double face 22 sont de même largeur. La différence essentielle qui existe entre cette partie et une partie amont d'une machine de fabrication connue de carton ondulé double face réside dans le fait que les deux bobines 30, 40 précitées sont décalées l'une par rapport à l'autre d'environ la moitié de la laize transversalement aux axes de défilement respectifs 31 , 41 de la nappe simple face et de la couverture double face.This part comprises a coil 30 of a single-sided sheet of corrugated cardboard 21 and a reel 40 of double-sided cover 22. The single-sided sheet 21 and the double-sided cover 22 are of the same width. The essential difference which exists between this part and an upstream part of a known machine for manufacturing double-sided corrugated cardboard lies in the fact that the two above-mentioned coils 30, 40 are offset relative to each other by approximately half of the width transversely to the respective travel axes 31, 41 of the single-sided sheet and of the double-sided cover.
La nappe simple face 21 est entraînée par un tambour crénelé 32, commandée par un moto-variateur et présentant les cannelures axiales dans lesquelles s'emboîtent les cannelures du carton ondulé. Un contre-rouleau 33 maintient la nappe en contact avec le carton crénelé.The single-sided ply 21 is driven by a crenellated drum 32, controlled by a motor-variator and having the axial grooves in which fit the grooves of the corrugated cardboard. A counter-roller 33 keeps the sheet in contact with the crenellated cardboard.
La nappe s'enroule ensuite sur un rouleau 34 disposé de telle manière que la nappe ne s'applique que sur une fraction de tour du tambour. La nappe double face, quant à elle, est introduite entre deux rouleaux d'entraînement 42, 43 commandés également par un moto-variateur.The sheet is then wound on a roller 34 arranged in such a way that the sheet only applies over a fraction of a turn of the drum. The double-sided ply, for its part, is introduced between two drive rollers 42, 43 also controlled by a motor-variator.
Les vitesses d'entraînement linéaire respectives de la nappe simple face et de la couverture double face V-, et V2 sont égales.The respective linear drive speeds of the single-sided ply and of the double-sided cover V-, and V 2 are equal.
Pour éviter toute fluctuation instantanée de ces vitesses, on monte entre les bobines 30, 40 et la partie du dispositif représentée à la figure 3b des dispositifs d'absorption de fluctuation ou embarreurs 35 et 45. Ces derniers étant identiques, un seul sera décrit. L'embarreur 35 comprend deux rouleaux fixes 36, 37 autour desquels passe la nappe simple face en formant une boucle verticale dont l'extrémité s'enroule sur un tambour 38 librement suspendu. Lorsque la vitesse linéaire instantanée de la nappe simple face fluctue, le tambour 38 se déplace verticalement entre une position basse et une position haute illustrées respectivement en traits pleins et en traits tiretés sur la figure 3a. A la sortie de l'embarreur 35, la nappe simple face 21 s'enroule ensuite sur un tambour d'asservissement dont le rôle sera expliqué ci-dessous, puis elle passe dans un dispositif d'encollage 50 piloté par un moteur d'entraînement, non représenté. Ce tambour devra être le plus léger possible pour que son inertie n'engendre pas d'effets d'accélération ou de décélération trop importante. Il prélève de la colle par barbotage dans un bac 51 , le surplus étant retiré par un rouleau d'essorage 52 Un contre-rouleau de pressage 53 applique la nappe simple face 21 contre le tambour d'encollage 53. Les cannelures de la nappe simple face sont ainsi encollées. Le tambour d'asservissement 39 pilote le moteur du tambour d'encollage 53 de manière à l'entraîner à la même vitesse que celle de défilement de la nappe simple face.To avoid any instantaneous fluctuation of these speeds, there is mounted between the coils 30, 40 and the part of the device shown in FIG. 3b of the fluctuation absorption devices or bar feeders 35 and 45. The latter being identical, only one will be described. The bar feeder 35 comprises two fixed rollers 36, 37 around which the single-sided ply passes, forming a vertical loop, the end of which is wound on a freely suspended drum 38. When the instantaneous linear speed of the single-sided ply fluctuates, the drum 38 moves vertically between a low position and a high position illustrated respectively in solid lines and in dashed lines in FIG. 3a. At the exit of the bar feeder 35, the single-sided ply 21 is then wound up on a servo drum whose role will be explained below, then it passes through a gluing device 50 controlled by a drive motor , not shown. This drum should be as light as possible so that its inertia does not generate excessive acceleration or deceleration effects. It takes glue by bubbling into a tank 51, the surplus being removed by a wringing roller 52 A pressing counter-roller 53 applies the single-sided ply 21 against the sizing drum 53. The grooves of the single ply face are thus glued. The servo drum 39 drives the motor of the sizing drum 53 so as to drive it at the same speed as that of travel of the single-sided sheet.
Si cette condition n'était pas remplie, la nappe glisserait sur le tambour d'encollage et « essuierait » la colle sans s'en imprégner. Différents systèmes d'asservissement 39 connus peuvent être utilisés. Par exemple, le tambour d'asservissement peut être muni sur sa périphérie d'un disque cranté de faible largeur, qui engrène dans les cannelures de la nappe et qui est donc entraîné à une vitesse parfaitement synchrone de celle de la nappe. Ce disque entraîne un codeur optique fournissant la fréquence d'asservissement destinée au pilotage du moteur d'entraînement du tambour d'encollage.If this condition was not fulfilled, the tablecloth would slide on the sizing drum and "wipe" the glue without impregnating it. Different known control systems 39 can be used. For example, the servo-drum can be provided on its periphery with a notched disc of small width, which meshes in the grooves of the sheet and which is therefore driven at a speed perfectly synchronous with that of the sheet. This disc drives an optical encoder providing the servo frequency for controlling the drive motor of the sizing drum.
Sur la figure 3b, on voit que la nappe simple face ainsi encollée et la couverture double face s'engagent de manière décalée sur le manchon 6 à section rosace identique à celui représenté aux figures 2a et 2b.In FIG. 3b, it can be seen that the single-sided sheet thus glued and the double-sided cover engage in an offset manner on the sleeve 6 with rosette section identical to that shown in FIGS. 2a and 2b.
L'axe de ce manchon 6 est incliné et fait un angle α avec l'axe de défilement de la nappe simple face et de la couverture double face et est en rotation à une vitesse correspondant aux vitesses d'entraînement linéaire V, et V2 mentionnées ci-dessus, à l'aide d'un moteur à vitesse variable non représenté et situé du côté du lecteur. L'angle α est de toute manière suffisamment faible de manière à permettre le positionnement bord à bord de la nappe simple face 21 à chaque tour de rotation effectué par le manchon 6. L'angle d'inclinaison α du manchon 6 peut bien évidemment être différent, sachant qu'il doit rester dans des limites telles que la limite d'extensibilité de la nappe simple face 21 n'est pas atteinte. De plus, il dépend également de la valeur du décalage transversal choisi entre les deux bobines de composants du carton ondulé.The axis of this sleeve 6 is inclined and forms an angle α with the axis of travel of the single-sided ply and of the double-sided cover and is in rotation at a speed corresponding to the linear drive speeds V, and V 2 mentioned above, using a variable speed motor not shown and located on the side of the reader. The angle α is in any case sufficiently small so as to allow the edge-to-edge positioning of the single-sided ply 21 at each rotation rotation carried out by the sleeve 6. The angle of inclination α of the sleeve 6 can obviously be different, knowing that it must remain within limits such that the extensibility limit of the single-sided ply 21 is not reached. In addition, it depends also the value of the transverse offset chosen between the two coils of components of the corrugated board.
Quel que soit le type de composants utilisés pour fabriquer la nappe simple face 21 , cet angle d'inclinaison, qui est donc égal à l'angle formé par la ligne des sommets de la cannelure et l'axe de révolution du manchon 6, doit être inférieur ou égal à 45 ° .Whatever the type of components used to manufacture the single-sided ply 21, this angle of inclination, which is therefore equal to the angle formed by the line of the tops of the groove and the axis of revolution of the sleeve 6, must be less than or equal to 45 °.
Ce manchon 6 est en outre pourvu tout le long de sa portée d'une multitude d'orifices non représentés, identiques aux orifices 1 1 de la figure 2a.This sleeve 6 is further provided throughout its range with a multitude of orifices not shown, identical to the orifices 1 1 in FIG. 2a.
Les orifices débouchent dans une gorge du type cylindrique, elle-même reliée à un dispositif de dépression du type pompe à vide situé du côté du lecteur et non représenté qui « plaque » donc la nappe simple face 21 contre le manchon 6.The orifices open into a groove of the cylindrical type, itself connected to a vacuum device of the vacuum pump type located on the side of the reader and not shown, which therefore "plates" the single-sided sheet 21 against the sleeve 6.
On précise ici que la dépression est de toute façon suffisamment faible pour permettre à la nappe simple face 21 de « parcourir » le manchon 6 en formant une hélice 60.It is specified here that the vacuum is in any case sufficiently low to allow the single-sided ply 21 to "run through" the sleeve 6 by forming a helix 60.
Cette hélice 60, est recouverte de la couverture double face 22 qui vient donc s'y plaquer et s'y coller, une fois le « décalage » rattrapé par des moyens non représentés. Ces moyens sont mécaniques du type galets dont la forme est exactement complémentaire à celle des concavités du manchon 6 et/ou des moyens pneumatiques du type enceinte mise sous pression.This propeller 60 is covered with the double-sided cover 22 which is therefore pressed against it and adhered thereto, once the "offset" has been caught up by means not shown. These means are mechanical of the roller type whose shape is exactly complementary to that of the concavities of the sleeve 6 and / or of the pneumatic means of the pressurized enclosure type.
Des dispositifs de séchage, par exemple par chauffage électrique, non représentés sont prévus le long du manchon et facilitent donc le séchage de ce complexe cartonné ainsi formé.Drying devices, for example by electric heating, not shown are provided along the sleeve and therefore facilitate the drying of this cardboard complex thus formed.
En partie terminale du manchon, le complexe passe dans un dispositif de cisaillage rotatif 70 de forme exactement complémentaire au manchon et constitué par exemple d'une lame en acier dur destinée à cisailler le complexe cartonné en plusieurs bandes latérales droites 23 ayant chacune une largeur égale à la paroi latérale 2 de la boite 1 à fabriquer, telle que celle représentée à la figure 1 . Bien évidemment, pour assurer la découpe en bandes parallèles droites, l'axe du dispositif de cisaillage doit lui-même être exactement parallèle à l'axe de rotation du manchon 6 et avoir la même vitesse linéaire que la vitesse de défilement de la nappe simple face. De manière avantageuse, on peut tout comme dans le dispositif des figures 2a et 2b prévoir une découpe à l'aide d'un laser.In the terminal part of the sleeve, the complex passes through a rotary shearing device 70 of shape exactly complementary to the sleeve and consisting for example of a hard steel blade intended to shear the cardboard complex into several straight lateral bands 23 each having an equal width to the side wall 2 of the box 1 to be manufactured, such as that shown in FIG. 1. Obviously, to ensure cutting into straight parallel strips, the axis of the shearing device must itself be exactly parallel to the axis of rotation of the sleeve 6 and have the same linear speed as the speed of movement of the single web. face. Advantageously, it is possible, just as in the device in FIGS. 2a and 2b, to provide a cut using a laser.
Les bandes latérales cartonnées 23 ainsi découpées se dégagent du manchon 6 et viennent s'empiler dans des caissons 80 à fond mobile 81 situés en arrière-pian. La fabrication d'une boite 2 selon l'invention s'achève par une opération de collage d'une bande latérale sur un fond.The cardboard lateral strips 23 thus cut out from the sleeve 6 and are stacked in boxes 80 with a movable bottom 81 located at the rear. The manufacture of a box 2 according to the invention ends with an operation of gluing a side strip on a bottom.
Pour cette opération, on prévoit par exemple de débiter des bandes latérales par le fond mobile 81 des caissons 80, fond relié à un convoyeur à bande sans fin, sur des tables au-dessus desquelles sont placés des fonds 3 faits en carton ondulé double face, dont les bords périphériques sont encollés. On peut également prévoir pour cette opération de positionner successivement et d'assembler ainsi un fond 3 et une bande latérale 23 dont les bords sont encollés.For this operation, provision is made, for example, to cut side strips by the movable bottom 81 of the boxes 80, bottom connected to an endless belt conveyor, on tables above which are placed bottoms 3 made of double-sided corrugated cardboard. , whose peripheral edges are glued. It is also possible for this operation to position successively and thus assemble a bottom 3 and a side strip 23 whose edges are glued.
Les manchons des deux dispositifs selon l'invention qui viennent d'être décrits peuvent bien évidemment prendre des formes variées telles qu'un manchon cylindrique ou un manchon à base ellipsoïdale, la longueur du manchon étant nécessairement supérieure à la largeur de la nappe simple face.The sleeves of the two devices according to the invention which have just been described can obviously take various forms such as a cylindrical sleeve or a sleeve with an ellipsoidal base, the length of the sleeve necessarily being greater than the width of the single-sided ply .
Dans le cas du deuxième dispositif, la synchronisation entre la vitesse de rotation et les vitesses linéaires de défilement respectives de la nappe simple face et de la couverture double face est un élément important qu'il est indispensable de contrôler, faute de quoi le complexe cartonné n'a pas la forme désirée et, pis encore, sa fabrication est vouée à l'échec.In the case of the second device, the synchronization between the rotation speed and the respective linear speeds of travel of the single-sided sheet and of the double-sided cover is an important element which it is essential to control, otherwise the cardboard complex does not have the desired shape and, worse still, its manufacture is doomed to failure.
Egalement, dans le cas de ce deuxième dispositif selon l'invention, lorsque le manchon ne présente pas de forme concave tournée vers l'extérieur du manchon, par exemple dans le cas d'un cylindre, il n'est pas nécessaire d'avoir des moyens de mise sous dépression du manchon et/ou des moyens d'application de la double face 22 sur le manchon.Also, in the case of this second device according to the invention, when the sleeve does not have a concave shape turned towards the outside of the sleeve, for example in the case of a cylinder, it is not necessary to have means for placing the sleeve under vacuum and / or means for applying the double face 22 to the sleeve.
En effet, la seule tension à la fois de la nappe simple face 21 et de la couverture double face 22 suffit à maintenir « plaquer » le complexe cartonné contre le manchon 6.Indeed, the only tension of both the single-sided ply 21 and the double-sided cover 22 is sufficient to keep the cardboard complex "pressed" against the sleeve 6.
Les dispositifs de fabrication décrits ci-dessus permettent d'avoir accès à des emballages, notamment de faible dimension, à la fois esthétiques, légers et robustes. Cette dernière caractéristique est particulièrement mise en évidence à l'aide des courbes comparatives de la figure 4. Celles-ci sont obtenues à partir d'un essai d'écrasement qui permet de mesurer la résistance à la compression sur chant, parallèlement au bord de la cannelure et donc permet d'apprécier la compression dynamique.The manufacturing devices described above make it possible to have access to packaging, in particular of small size, which is at the same time aesthetic, light and robust. This last characteristic is particularly highlighted using the comparative curves of FIG. 4. These are obtained from a crushing test which makes it possible to measure the compressive strength on edge, parallel to the edge of the groove and therefore allows to appreciate the dynamic compression.
Les essais ont été réalisés à l'aide d'un dispositif du type compressomètre de la Société L&W qui comporte deux plateaux se rapprochant à vitesse constante perpendiculairement à la cannelure.The tests were carried out using a device of the compressometer type from the company L&W which comprises two plates approaching at constant speed perpendicular to the groove.
La mesure de résistance à l'écrasement consiste alors à relever la force mesurée en daN fournie par les plateaux en fonction de la déformation de l'éprouvette placée entre ces plateaux mesurée en millimètres.The resistance to crushing measurement then consists in recording the force measured in daN supplied by the plates as a function of the deformation of the test piece placed between these plates measured in millimeters.
La courbe en trait pointillé de la figure 4 est relative à une paroi de hauteur 1 30 mm à section rectangulaire, de 1 80 mm de longueur et de 75 mm de largeur faite à partir d'un carton ondulé double plat que l'on a rainé puis collé à partir d'une colle vinylique, à titre d'exemple comparatif.The curve in dotted lines in FIG. 4 relates to a wall 1 30 mm high with rectangular section, 1 80 mm long and 75 mm wide made from a double flat corrugated cardboard which has been grooved and then glued with vinyl glue, as a comparative example.
Ce carton ondulé double face plat comporte une nappe simple face dont la couverture simple face de grammage égal à 1 50 g/m2 en papier kraft est associée à une cannelure de type C de grammage égal à 1 20 g/m2 en papier VP et une couverture double face de grammage égal à 200 g/m2 en papier kraft. La courbe en trait continu de la figure 4 est relative à un cylindre de carton ondulé réalisé selon l'invention de 1 30 mm de hauteur et de diamètre égal à 1 65 mm, le collage ayant été effectué également à partir d'une colle vinylique. Les caractéristiques des composants de ce carton sont strictement identiques à celles définies ci-dessusThis double-sided flat corrugated cardboard has a single-sided sheet whose single-sided cover of grammage equal to 1 50 g / m 2 in kraft paper is associated with a type C groove of grammage equal to 1 20 g / m 2 in VP paper and a double-sided cover of grammage equal to 200 g / m 2 in kraft paper. The curve in solid line in FIG. 4 relates to a cylinder of corrugated cardboard produced according to the invention of 1 30 mm in height and with a diameter equal to 1 65 mm, the bonding having also been carried out using a vinyl adhesive. . The characteristics of the components of this carton are strictly identical to those defined above
Le poids des deux cartons est sensiblement identique et est égal à 38,2 g .The weight of the two boxes is substantially identical and is equal to 38.2 g.
En comparant les deux courbes on voit clairement que le mode de déformation n'est pas du tout le même pour un carton ondulé double face rainé et un carton ondulé fermé objet de l'invention.By comparing the two curves, it is clear that the deformation mode is not at all the same for a double-sided corrugated cardboard and a closed corrugated cardboard object of the invention.
Si les limites élastiques sont sensiblement identiques, la rupture par flambage du carton est absolument évitée dans le cas de la structure spécifique selon l'invention et il y a donc un certain effet « d'amortisseur » en sus d'une bien meilleure ténacité. On peut donc en conclure que, pour un poids identique, la résistance à la longévité sous effort assure à un emballage d'une contenance donnée une performance supérieure dans le cas où il est fabriqué selon l'invention.If the elastic limits are substantially identical, the buckling rupture of the cardboard is absolutely avoided in the case of the specific structure according to the invention and there is therefore a certain "damping" effect in addition to a much better toughness. It can therefore be concluded that, for an identical weight, the resistance to longevity under stress provides a package with a given capacity with superior performance in the case where it is manufactured according to the invention.
En d'autres termes, en cas de gerbages, les emballages selon l'invention auront tendance en cas de trop forte charge à s'affaisser progressivement au lieu de céder brusquement, ce qui est avantageux lorsqu'on veut récupérer les contenus fragiles et coûteux, par exemple, les denrées périssables, avant écrasement.In other words, in the case of stacking, the packaging according to the invention will tend, in the event of too high a load, to gradually collapse instead of giving way suddenly, which is advantageous when the fragile and expensive contents are to be recovered. , for example, perishable goods, before crushing.
Il va de soi que de nombreuses modifications de détail peuvent être apportées au procédé, aux dispositifs et aux cartons obtenus décrits sans pour autant sortir du cadre de l'invention. Par exemple, au lieu d'encoller les cannelures de la nappe simple face, on peut tout aussi bien encoller la feuille de couverture double face.It goes without saying that numerous modifications of detail can be made to the process, to the devices and to the cartons obtained described without departing from the scope of the invention. For example, instead of gluing the grooves of the single-sided sheet, we can just as well glue the double-sided cover sheet.
De même, au lieu de cintrer la nappe simple face, on peut tout aussi bien cintrer la feuille de couverture double face.Likewise, instead of bending the single-sided sheet, it is equally possible to bend the double-sided cover sheet.
Enfin, au lieu de contrecoller la couverture double face, on peut pareillement contrecoller une ou plusieurs nappe(s) simple face. Finally, instead of laminating the double-sided cover, you can also laminate one or more single-sided tablecloths.

Claims

REVENDICATIONS
1 . Procédé de fabrication d'un carton ondulé rigide (2) comprenant, au préalable, une étape de production d'au moins une nappe simple face (21 ) de largeur donnée par collage d'une cannelure à une couverture simple face, caractérisé en ce qu'on réalise les étapes suivantes : a) on cintre selon une forme désirée la nappe simple face (21 ), b) on encolle les sommets de la cannelure de la nappe simple face (21 ) cintrée, c) on colle au moins une couverture double face (22) de même largeur que la nappe simple face sur ladite nappe simple face (21 ) de manière à ce qu'elle épouse la forme cintrée de ladite nappe.1. Method for manufacturing a rigid corrugated cardboard (2) comprising, beforehand, a step of producing at least one single-sided sheet (21) of width given by gluing a groove to a single-sided cover, characterized in that the following steps are carried out: a) the single-sided ply (21) is bent to a desired shape, b) the edges of the groove of the bent single-sided ply (21) are glued, c) at least one double-sided cover (22) of the same width as the single-sided ply on said single-sided ply (21) so that it matches the curved shape of said ply.
2. Procédé selon la revendication 1 , caractérisé en ce qu'on réalise l'étape a) en fermant la nappe simple face (21 ) sur elle-même.2. Method according to claim 1, characterized in that step a) is carried out by closing the single-sided sheet (21) on itself.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu' on découpe une longueur prédéterminée de la nappe simple face (21 ) avant de la cintrer.3. Method according to claim 1 or 2, characterized in that a predetermined length of the single-sided sheet (21) is cut before bending it.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'avant d'effectuer le collage d'au moins une couverture double face (22), on détermine un rapport de la longueur de la couverture double face sur la longueur de la couverture simple face, de manière à ajuster au mieux la superposition des deux couvertures entre elles.4. Method according to one of claims 1 to 3, characterized in that before performing the bonding of at least one double-sided cover (22), a ratio of the length of the double-sided cover is determined on the length of the single-sided cover, so as to best adjust the overlap of the two covers between them.
5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'on découpe ladite couverture double face (22) avant ou après l'avoir collée sur la nappe simple face cintrée (21 ) . 5. Method according to one of the preceding claims, characterized in that said double-sided cover (22) is cut before or after having been glued to the curved single-sided sheet (21).
6. Procédé selon la revendication 1 , caractérisé en ce qu'on cintre la nappe simple face (21 ) en la déformant de manière à ce que l'angle α formé par la direction de ladite forme désirée cintrée et la ligne des sommets de la cannelure soit compris entre 0 et 45 ° .6. Method according to claim 1, characterized in that the single-sided ply (21) is bent by deforming it so that the angle α formed by the direction of said desired curved shape and the line of the vertices of the groove is between 0 and 45 °.
7. Procédé selon l'une des revendications 1 ou 6, caractérisé en ce qu' on découpe le carton ondulé rigide (2) une fois cintré.7. Method according to one of claims 1 or 6, characterized in that the rigid corrugated cardboard (2) is cut once bent.
8. Procédé selon l'une des revendications 2 à 5, caractérisé en ce qu'on effectue un assemblage du carton ondulé rigide cintré et fermé (2) avec une pièce plane (3) , notamment en carton ondulé, de manière à réaliser un contenant du type boite ( 1 ).8. Method according to one of claims 2 to 5, characterized in that an assembly is carried out of the rigid curved and closed corrugated cardboard (2) with a flat piece (3), in particular of corrugated cardboard, so as to produce a container type (1).
9. Procédé selon la revendication 8, caractérisé en ce qu'on effectue l'assemblage par sertissage, collage ou agrafage.9. Method according to claim 8, characterized in that the assembly is carried out by crimping, gluing or stapling.
1 0. Dispositif (4) de mise en oeuvre du procédé selon l'un des revendications précédentes, caractérisé en ce qu'il comporte :1 0. Device (4) for implementing the method according to one of the preceding claims, characterized in that it comprises:
- des moyens (6, 14) pour cintrer la nappe simple face (21 ),- means (6, 14) for bending the single-sided ply (21),
- des moyens (50) pour encoller les sommets de la cannelure de la nappe simple face cintrée,- means (50) for gluing the tops of the groove of the curved single-face ply,
- des moyens ( 1 4) pour appliquer au moins une couverture double face (22) de même largeur que la nappe simple face, sur ladite nappe simple face cintrée.- Means (1 4) for applying at least a double-sided cover (22) of the same width as the single-sided ply, on said curved single-sided ply.
1 1 . Dispositif selon la revendication 1 0, caractérisé en ce que les moyens (6, 1 4) pour cintrer la nappe simple face (21 ) comportent en outre des moyens pour fermer ladite nappe sur elle-même. 1 1. Device according to claim 1 0, characterized in that the means (6, 1 4) for bending the single-sided sheet (21) further comprise means for closing said sheet on itself.
1 2. Dispositif selon la revendication 1 0 ou 1 1 , caractérisé en ce qu'il comporte, en outre, un dispositif de découpage d'une longueur prédéterminée de la nappe simple face (21 ).1 2. Device according to claim 1 0 or 1 1, characterized in that it further comprises a device for cutting a predetermined length of the single-sided ply (21).
1 3. Dispositif selon l'une des revendications 1 0 à 1 2, caractérisé en ce qu'il comporte un dispositif de découpage de la couverture double face collée (22) .1 3. Device according to one of claims 1 0 to 1 2, characterized in that it comprises a device for cutting the bonded double-sided cover (22).
1 4. Dispositif selon la revendication 1 0, caractérisé en ce qu'il comporte un dispositif de découpage (70) du carton ondulé rigide cintré (2).1 4. Device according to claim 1 0, characterized in that it comprises a cutting device (70) of curved rigid corrugated cardboard (2).
1 5. Dispositif selon l'une des revendications 10 à 1 4, caractérisé en ce que les moyens d'incurvation comportent un moule (6) . 1 5. Device according to one of claims 10 to 1 4, characterized in that the curving means comprise a mold (6).
1 6. Dispositif selon la revendication 1 5, caractérisé en ce qu'il comporte des moyens (7, 8) pour mettre en dépression la surface du moule.1 6. Device according to claim 1 5, characterized in that it comprises means (7, 8) for vacuuming the surface of the mold.
1 7. Dispositif selon l'une des revendications 1 0 à 1 6, caractérisé en ce que les moyens d'application de la couverture double face sur la nappe simple face comportent au moins un contre-moule de forme complémentaire dans une zone d'incurvation.1 7. Device according to one of claims 1 0 to 1 6, characterized in that the means for applying the double-sided covering on the single-sided sheet comprise at least one counter-mold of complementary shape in a zone of bending.
1 8. Dispositif selon l'une des revendications 1 1 à 1 7, caractérisé en ce qu'il comporte un dispositif d'assemblage du carton ondulé rigide fermé (2) avec une pièce plane (3), notamment en carton ondulé, de manière à réaliser un contenant du type boite ( 1 ).1 8. Device according to one of claims 1 1 to 1 7, characterized in that it comprises a device for assembling closed rigid corrugated cardboard (2) with a flat piece (3), in particular made of corrugated cardboard, of way to achieve a box-type container (1).
1 9. Carton ondulé rigide (2), caractérisé en ce qu'il est obtenu conformément au procédé selon l'une des revendications 1 à 9.1 9. Rigid corrugated cardboard (2), characterized in that it is obtained according to the method according to one of claims 1 to 9.
20. Carton selon la revendication 1 9, caractérisé en ce que la distance minimale entre le sommet et le creux d'une ondulation de la cannelure dmjn est approximativement égale à H - 0,5 p, où H et p représentent respectivement la hauteur et le pas de ladite cannelure.20. Cardboard according to claim 1 9, characterized in that the minimum distance between the top and the bottom of a corrugation of the groove d mjn is approximately equal to H - 0.5 p, where H and p respectively represent the height and the pitch of said groove.
21 . Utilisation d'un carton ondulé selon la revendication 1 9 ou 20 en tant que baril, caisse, boîte, enveloppe. 21. Use of a corrugated cardboard according to claim 1 9 or 20 as a barrel, case, box, envelope.
EP98924384A 1997-05-06 1998-05-06 Rigid corrugated cardboard Withdrawn EP0930964A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9705558A FR2763018B1 (en) 1997-05-06 1997-05-06 RIGID CORRUGATED BOARD
FR9705558 1997-05-06
PCT/FR1998/000906 WO1998050226A1 (en) 1997-05-06 1998-05-06 Rigid corrugated cardboard

Publications (1)

Publication Number Publication Date
EP0930964A1 true EP0930964A1 (en) 1999-07-28

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EP98924384A Withdrawn EP0930964A1 (en) 1997-05-06 1998-05-06 Rigid corrugated cardboard

Country Status (11)

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US (1) US20020000285A1 (en)
EP (1) EP0930964A1 (en)
JP (1) JP2000513668A (en)
AU (1) AU7660098A (en)
BR (1) BR9804882A (en)
CA (1) CA2260260A1 (en)
CZ (1) CZ3199A3 (en)
FR (1) FR2763018B1 (en)
HU (1) HUP0002368A2 (en)
PL (1) PL330874A1 (en)
WO (1) WO1998050226A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2790420B1 (en) * 1999-03-04 2001-05-25 Smurfit Worldwide Res Europ RIGID CORRUGATED BOARD
GB2367284B (en) * 2000-09-30 2004-11-17 Hulya Nilay Erciyas Packaging container
GB2477772A (en) * 2010-02-12 2011-08-17 Smurfit Kappa Uk Ltd Corrugated board construction

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Publication number Priority date Publication date Assignee Title
US2440391A (en) * 1944-12-08 1948-04-27 Bogoslowsky Boris Apparatus for shaping tubular blanks
FR1027765A (en) * 1950-11-17 1953-05-15 Tubular packaging of corrugated cardboard for light bulbs and other objects, and its manufacturing process
FR1217841A (en) * 1958-12-10 1960-05-05 Cenpa Object consisting at least in part of a developable surface, for example of cardboard, and its manufacturing process
DE2116276A1 (en) * 1970-04-03 1971-10-21
GB1372351A (en) * 1971-10-01 1974-10-30 Reed Co Ltd Thomas Packaging
DE7514825U (en) * 1975-04-22 1975-12-11 Saul Franz J Polygonal winding tube
GB2044225B (en) * 1979-02-15 1983-02-23 Corrugated Prod Ltd Tubular carton
FR2481229A1 (en) * 1980-04-25 1981-10-30 Chabaud Jacques Large, rigid sealed tubs - made from rolled corrugated cardboard with plain card or film covers, for structural stability with low wt. and cost
JPS61249739A (en) * 1985-04-30 1986-11-06 Toyo Glass Kk Manufacture of plastic sleeve and its device

Non-Patent Citations (1)

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Title
See references of WO9850226A1 *

Also Published As

Publication number Publication date
FR2763018A1 (en) 1998-11-13
AU7660098A (en) 1998-11-27
PL330874A1 (en) 1999-06-07
HUP0002368A2 (en) 2000-10-28
US20020000285A1 (en) 2002-01-03
WO1998050226A1 (en) 1998-11-12
JP2000513668A (en) 2000-10-17
FR2763018B1 (en) 1999-06-18
BR9804882A (en) 2000-01-25
CZ3199A3 (en) 1999-12-15
CA2260260A1 (en) 1998-11-12

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