WO2007025707A1 - Procede et dispositif pour produire une matiere composite de type carton ondule - Google Patents

Procede et dispositif pour produire une matiere composite de type carton ondule Download PDF

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Publication number
WO2007025707A1
WO2007025707A1 PCT/EP2006/008424 EP2006008424W WO2007025707A1 WO 2007025707 A1 WO2007025707 A1 WO 2007025707A1 EP 2006008424 W EP2006008424 W EP 2006008424W WO 2007025707 A1 WO2007025707 A1 WO 2007025707A1
Authority
WO
WIPO (PCT)
Prior art keywords
medium
composite material
coating
adhesive
strips
Prior art date
Application number
PCT/EP2006/008424
Other languages
German (de)
English (en)
Inventor
Rainer Kehrle
Original Assignee
Rainer Kehrle
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 Rainer Kehrle filed Critical Rainer Kehrle
Publication of WO2007025707A1 publication Critical patent/WO2007025707A1/fr

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Classifications

    • 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
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D3/00—Making articles of cellular structure, e.g. insulating board
    • B31D3/005—Making cellular structures from corrugated webs or sheets
    • B31D3/007—Making cellular structures from corrugated webs or sheets by cutting corrugated webs longitudinally into strips, piling these strips and uniting them
    • 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
    • B31F1/2813—Making corrugated cardboard of composite structure, e.g. comprising two or more corrugated layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/12—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/08—Corrugated paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/12—Coating on the layer surface on paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness

Definitions

  • the invention relates to a method and an apparatus for the quasi-continuous production of corrugated cardboard-like composite material from a precursor web.
  • the precursor web essentially has a flat base web and a corrugated, wave-like or honeycomb-shaped structure and secured to the base web.
  • the precursor web is divided into strips and assembled into the composite.
  • Such a method and such a device are known for example from GB 1 395 801. It describes a device by means of which a composite material is produced from a precursor web, which essentially consists of a flat base web and a corrugated wave web, wherein the corrugated web is fastened to the base web. For this purpose, the precursor web is cut into strips of equal width and then joined together by gluing to form a composite material plate. A coating of the composite material is not provided.
  • EP 0 183 393 A2 discloses a sheet-like and corrugated cardboard-like composite material in which a substantially straight base sheet and / or a corrugated wave sheet is provided in sections with a coating. A coating of the entire composite material is not provided, so that the composite material may have locations that are not protected, for example, against external influences.
  • the method comprises the steps of completely coating the precursor web, the strip or the composite material and bonding the strips to form a composite material.
  • the coating is carried out with a coating medium.
  • the gluing of the strips is done with an adhesive medium, wherein the adhesive medium belongs to the same class of material as the coating medium or adhesive medium and coating medium are the same.
  • the precursor web can be made of, for example, a metal, paperboard or paper, a composite material or the like, as well as a combination of these materials.
  • the wave path can be glued, soldered, welded or fixed by means of another type of connection on the base web, for example.
  • the waves of the wave path can be symmetrical or asymmetrical.
  • They may have a round shape, for example a sinusoidal shape, an angular shape, for example a triangular or polygonal shape, or a mixed shape, for example a semicircular arc, which is followed by a straight transverse web.
  • a round shape for example a sinusoidal shape
  • an angular shape for example a triangular or polygonal shape
  • a mixed shape for example a semicircular arc, which is followed by a straight transverse web.
  • the heights of the waves are always at least approximately identical within a precursor web type.
  • the precursor web is preferably present as a roll, so that it is present as a quasi-endless raw material.
  • honeycomb or honeycomb-like training is understood here a volume which is at least approximately completely enclosed on its lateral surface by a material bounding the honeycomb.
  • a complete coating according to the invention of the precursor web, of the strip or of the composite material agent with a coating medium it is achieved that the coating is applied without gaps at all points of the composite material.
  • a complete protective effect is ensured by the coating used.
  • a protective effect can be, for example, a flame-retardant, water-repellent and / or a herbicidal or fungicidal action, whereby also , _
  • the adhesive medium or coating medium for example, resins or the like can be used.
  • the use of phenols as coating medium or adhesive medium has proven to be particularly advantageous.
  • the strips are first bonded to the composite material with the adhesive medium, and the composite material is subsequently completely coated with the coating medium.
  • the composite material is subsequently completely coated with the coating medium.
  • the order to be used depends on the adhesive medium or coating medium used and the effects desired by the coating.
  • the precursor web with the adhesive medium is used to produce adhesive contact surfaces.
  • the adhesive medium can be applied, for example, by means of a spray device, a dip bath, a curtain, rolls or rollers or the like.
  • devices have proved to be particularly advantageous which permit the application of defined quantities of adhesive medium on defined areas or in defined areas, such as the application of the adhesive medium by means of rollers or rollers only on wave crests of the wave path.
  • the adhesive medium and the coating medium are cured in a curing distance.
  • the curing within the Aushärteumble can be done inter alia by means of tempering, ie elevated temperature.
  • the curing can also be effected by means of pressure changes relative to the normal ambient pressure, ie pressure increase or vacuuming, or by means of radiation, for example by means of UV light or IR light or radioactive radiation.
  • a distance of a certain length may be provided within the manufacturing device, to overcome the composite material requires a certain amount of time. This length of the route is then to be chosen so that the media can crystallize, for example.
  • the curing line is advantageous because the composite material can be further processed directly after curing without slippage of the strips relative to each other and the media can not be stripped off.
  • a partially cured adhesive medium and / or coating medium is transferred to a tacky state in a release route again.
  • the adhesive medium and / or the coating medium is converted by means of heat, solvent action and / or light again in an adhesive state.
  • the emission to be used depends on the respective medium and must take place opposite to the curing effect of the media.
  • Devices for generating the effects may be, for example, IR lamps, UV lamps, radiant heaters, fan heaters, devices for emitting gases, spray nozzles, rollers or the like.
  • the object underlying the invention is further achieved by a method comprising the steps of completely coating the precursor web, the strip or the composite material, bonding the strips to a composite material and filling open corrugated cardboard honeycomb.
  • the precursor web, the strips or the composite material are coated with a coating medium and the strips are glued by means of an adhesive medium.
  • the adhesive medium, the filling medium and / or the coating medium belong to the same material class and / or are the same.
  • the composite material can be provided with a higher stability.
  • insulating properties of the composite material can be increased.
  • Filling medium, adhesive and / or coating medium may, for example, be resins or the like, for example phenols. However, it is also possible to use plastics for these media, for example polyurethane (PU) or polystyrene (PS).
  • the base web and / or the wave path are provided with recesses, by means of which the filling medium is uniformly distributed in the composite material and connect the individual Gremediumportionen in the individual Wellpappewaben.
  • the base web and / or the wave path can also have recesses which are only recesses with a bottom, or else both through recesses and floor-limited recesses.
  • the filler material forms through the recesses undercuts or bridges between the corrugated honeycomb, so that the filling medium is held not only adhesively but also positively in the composite material.
  • the distribution of the filling material in the composite material becomes more uniform and the stability of the composite material is further improved, for example, according to the principle of reinforced concrete.
  • the filling medium on fire protection properties and / or other protective properties preferably correspond to those described above with respect to the adhesive medium or coating medium.
  • a cover layer with the coated, bonded and / or filled composite material is bonded to the filling medium in the corrugated cardboard honeycomb.
  • the corrugated cardboard honeycomb can be overfilled with filling medium, so that the filling medium protrudes slightly beyond the composite material.
  • the cover layer is applied and with , ,
  • the cover layer may also itself be provided with the filling medium, in which case the composite material should then be applied to the cover layer in such a way that the filling material can extend into the corrugated cardboard wafers and expand, for example by means of flowing or foaming.
  • the object underlying the invention is also achieved with a device for the quasi-continuous production of corrugated cardboard-like composite material from a precursor web.
  • the precursor web essentially has a flat base web and a corrugated web which is corrugated or wave-shaped and mounted on the base web.
  • the apparatus has a cutting device for dividing the substantially horizontally extending precursor web into strips.
  • the device also has deflection devices, guide devices and / or pressing devices which bring together the horizontally extending strips substantially in a vertical plane one above the other, optionally rotate them, place them on top of one another and thereby bond them with an adhesive medium.
  • the apparatus further comprises a coating line which coats the precursor web, the strips or the composite material.
  • the adhesive medium belongs to the same class of material as the coating medium or adhesive medium and coating medium are the same.
  • the precursor web is preferably to be divided without stripes and without deformation of the precursor web into strips, for which, for example, rotating knives own particular.
  • the deflecting devices, guiding devices and / or pressing devices can be designed as rollers, rollers, strip-shaped guiding devices, rails or plates.
  • the devices for applying the adhesive medium and the coating medium may be, for example, rollers, rollers, spray nozzles, curtain covers, immersion troughs or the like. , ,
  • the apparatus for the quasi-continuous production of the composite material may further comprise, for example, a curing line, a piecing line, a backfilling section and a device for applying cover devices.
  • FIG. 1 is a side view of an apparatus according to the invention for carrying out the method according to the invention according to a first embodiment
  • FIG. 2 shows a side view of a device according to the invention for carrying out the method according to the invention according to a second embodiment
  • FIG. 4 shows a detailed view of a coated precursor web
  • FIG. 5 shows a detailed view of a composite material with recesses
  • FIG. 6 shows a detailed view of a composite material with filled honeycombs.
  • FIG. 1 schematically shows a device 10 according to the invention for carrying out the method according to the invention for producing corrugated cardboard-like composite material 12.
  • the device 10 has a feeding device (not shown), a cutting device 14 and deflection devices 16, 18, 20 and pressing devices 22. Furthermore, the device 10 has an application device 24, a coating device 26, a cleaning device 28, a cover device 30 and a cutting device 32.
  • a precursor web 34 for example as corrugated cardboard, in any width, for example, supplied by a not shown roller of the cutting device 14.
  • the precursor web 34 is arranged on the feed device such that a flat base web 36 of the precursor web 34 faces a standing surface of the device 10.
  • a wavy wave path 38 is attached and glued.
  • the cutting device 14 has a rotatable shaft 40 on which a plurality of cutting discs 42 are arranged at equal distances from the respective directly adjacent blade disc. The number of cutting discs 42 is arbitrary.
  • the precursor web 34 is divided into equal strips 44 a, 44 b, 44 c, 44 d, 44 e waste-free.
  • the strips 44 are provided by means of the applicator 24 with an adhesive, wherein the applicator 24 is formed as a rotatably mounted roller.
  • the adhesive is applied only in relatively small areas of wave crests 46 of the wave path 38.
  • the adhesive may be, for example, a phenolic resin. , _
  • the strips 44 are fed to a rotatably mounted deflection roller 16, from which the strips 44 are deflected to different height levels.
  • rotatably mounted deflection rollers 18 are used, which are arranged in the course of the device after the deflection roller 16.
  • the pulleys 18 are also arranged at different height levels.
  • the strips 44 are combined by means not shown guide rails and the guide rollers 20 so that each form an underside of a base web 36 of a first strip with a wave crest of a wave path 36 of a second strip a contact surface.
  • the strips 44 are aligned such that their outer edges are aligned.
  • the stacked strips 44 are pressed together, so that the adhesive between the strip is subjected to a pressure.
  • the resulting composite material 12 is provided with a cover layer 48 by means of a cover device 30. This is supplied to the strand 12 by a roll, not shown.
  • the composite material 12 may have any height and width. The height and width of the composite material shown in the drawings is merely exemplary. The same applies to the number of strips 44.
  • the coating device 26 with the spray nozzles applies a coating medium 50, for example a phenolic resin, to the composite material 12.
  • the coating medium and the adhesive medium preferably belong to the same material class or are identical. Designed as air nozzles cleaning devices 28 remove too much _.
  • a curing line 52 shown as a dashed square is provided.
  • the coating medium 50 and the adhesive medium are cured. This can be done for example by means not shown heaters or IR lamps or UV lamps.
  • the cutting device 32 is preferably designed as a rotating knife whose cutting movement is synchronized according to arrow 52 during a feed movement of the strand 12 according to arrow 54. This results in a relative movement of the cutting device 32 to the strand 12, which runs parallel to the arrow 52, whereby a straight cut is formed.
  • the device 10 according to FIG. 2 has, in addition to the cover device 30, a further cover device 56.
  • the second cover device 30 which supplies a cover layer 58 to the strand, the honeycomb-like chambers of the strand 12 are covered.
  • the cover layer 58 is connected to the strand 12, preferably glued.
  • the device 10 has no separate application and coating devices and no cleaning device. Rather, a combined application and coating device 60 is provided, by means of which the coating medium 50, which is also used as an adhesive medium, is applied to the strips 44a, 44b, 44c, 44d, 44e and which is shown here schematically as an immersion bath.
  • the coating medium 50 which is also used as an adhesive medium
  • the dipping baths are passed through the strips 44a, 44b, 44c, 44d, 44e, so that the coating medium 50 can wash around all areas of the strips 44a, 44b, 44c, 44d, 44e.
  • the coating medium 50 used as the adhesive medium may be used as a filler for the composite material as needed.
  • a release path 60 ' in which a coating medium, with which the precursor web 12 is already precoated, is again converted into an adhesive-capable state.
  • the transfer can be effected for example by means of a solvent 50 'or by means not shown heating or light devices.
  • FIG. 3 shows a detailed view of a composite material plate.
  • the base webs 36, the wave paths 38 and the wave peaks 64 and troughs 66 of the wave paths 38 can be seen.
  • the wave peaks 64 form contact surfaces 68 with the base webs 36, in which the strips are glued together.
  • the wave shape of the wave paths 38 creates a honeycomb structure with a multiplicity of honeycombs 62.
  • FIG. 4 shows a section of a precursor web 34, which has the base web 36 and the wave web 38. Both the base web 36 and the wave web 38 are completely precoated with the coating medium 50.
  • the coating of the composite preferably has the same configuration as that of the precursor web 34, then only a plurality of strips 44a, 44b, 44c, 44d, 44e are stacked on top of each other.
  • the composite material 12 shown in FIG. 5 has a plurality of recesses 74, 75, wherein the recesses 74 are provided on the wave flanks 76 of the wave track 38 and the recesses 75 are provided in the base track 36.
  • the recesses 74, 75 can be generated, for example, before the wave path 38 is arranged and fixed on the base web 36. This can be done for example by means of a punching process.
  • the recesses 74, 75 may be distributed regularly and ordered but also disordered in the base web 36, in the wave path 38 or in the composite material 12.
  • the recesses 74, 75 have the task of connecting the honeycomb 60 with each other, so that a filling medium 76, which is introduced into the honeycomb 60, in the recesses 74, 75 may extend, so that compounds of the individual Gremediumportionen in the individual honeycombs arise.
  • a composite material 12 is produced by means of the introduced into the honeycomb filling medium 76, the stability is improved by the not visible in Figure 6 recesses on the principle of reinforced concrete.
  • the filling medium 76 in the honeycomb can also be used to transfer its insulating properties, for example, to the composite material 12, which then serves as a carrier structure for the filling medium 76.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un procédé pour produire quasiment en continu une matière composite de type carton ondulé à partir d'une feuille de produit primaire (34), la feuille de produit primaire (34) présentant une feuille de base plane (36) et une feuille ondulée (38) fixée à la feuille de base (36), et la feuille de produit primaire (34) étant subdivisée en bandes qui sont rassemblées pour donner une matière composite. Selon l'invention, les bandes sont revêtues entièrement d'un agent de revêtement (50), et collées au moyen d'un agent adhésif, pour donner une matière composite, l'agent adhésif et l'agent de revêtement (50) étant un seul et même agent.
PCT/EP2006/008424 2005-08-29 2006-08-29 Procede et dispositif pour produire une matiere composite de type carton ondule WO2007025707A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510041327 DE102005041327A1 (de) 2005-08-29 2005-08-29 Verfahren und Vorrichtung zur Herstellung von wellpappeartigem Verbundmaterial
DE102005041327.7 2005-08-29

Publications (1)

Publication Number Publication Date
WO2007025707A1 true WO2007025707A1 (fr) 2007-03-08

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ID=37027933

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Application Number Title Priority Date Filing Date
PCT/EP2006/008424 WO2007025707A1 (fr) 2005-08-29 2006-08-29 Procede et dispositif pour produire une matiere composite de type carton ondule

Country Status (2)

Country Link
DE (1) DE102005041327A1 (fr)
WO (1) WO2007025707A1 (fr)

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WO2010039047A1 (fr) * 2008-10-01 2010-04-08 Corcel Ip Limited Processus de fabrication
FR3012105A1 (fr) * 2013-10-22 2015-04-24 Peugeot Citroen Automobiles Sa Procede pour raidir un panneau galbe en tole au moyen d'un panneau en carton

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US3523853A (en) * 1961-12-12 1970-08-11 Richard V Thomas Apparatus for making honeycomb coreboard
US3526556A (en) * 1966-12-06 1970-09-01 Berner Ind Inc Apparatus and method for the continuous production of slabs or sheets composed of foamed polymeric material having a cellular core
US3726737A (en) * 1970-10-22 1973-04-10 Nippon Oil Seal Ind Co Ltd Method of producing silicon carbide articles having thin layer construction
US3912573A (en) * 1971-07-28 1975-10-14 Bernard P Kunz Apparatus for producing core material for honeycomb panels
FR2474950A1 (fr) * 1980-02-06 1981-08-07 Siera Ets Procede de fabrication d'une structure alveolee
EP0622174A1 (fr) * 1993-04-29 1994-11-02 Alois Dipl.-Ing. Öllinger Procédé pour la production des âmes légères
GB2339168A (en) * 1996-08-28 2000-01-19 Nicholas Mcmahon Use of a structure as a heat collector and a heat insulator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010039047A1 (fr) * 2008-10-01 2010-04-08 Corcel Ip Limited Processus de fabrication
US8790481B2 (en) 2008-10-01 2014-07-29 Corcel Ip Limited Manufacturing process
AU2009300441B2 (en) * 2008-10-01 2014-11-13 Corcel Ip Limited Manufacturing process
FR3012105A1 (fr) * 2013-10-22 2015-04-24 Peugeot Citroen Automobiles Sa Procede pour raidir un panneau galbe en tole au moyen d'un panneau en carton
WO2015058917A1 (fr) * 2013-10-22 2015-04-30 Peugeot Citroen Automobiles Sa Procédé pour raidir un panneau galbé en tôle au moyen d'un panneau en carton
US10201937B2 (en) 2013-10-22 2019-02-12 Adhex Technologies Method for stiffening a curved sheet-metal panel by means of a cardboard panel

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