EP2014458A1 - Herstellungsverfahren eines Paneels mit Honigwabenstruktur, Anlage für dessen Einbau und so erhaltenes Paneel - Google Patents

Herstellungsverfahren eines Paneels mit Honigwabenstruktur, Anlage für dessen Einbau und so erhaltenes Paneel Download PDF

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Publication number
EP2014458A1
EP2014458A1 EP08305396A EP08305396A EP2014458A1 EP 2014458 A1 EP2014458 A1 EP 2014458A1 EP 08305396 A EP08305396 A EP 08305396A EP 08305396 A EP08305396 A EP 08305396A EP 2014458 A1 EP2014458 A1 EP 2014458A1
Authority
EP
European Patent Office
Prior art keywords
panel
core
cells
central core
hot
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.)
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Application number
EP08305396A
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English (en)
French (fr)
Inventor
Gilles Le Masson
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.)
Societe de Materiaux et Techniques Composites SAS SMTC
Original Assignee
Societe de Materiaux et Techniques Composites SAS SMTC
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 Societe de Materiaux et Techniques Composites SAS SMTC filed Critical Societe de Materiaux et Techniques Composites SAS SMTC
Publication of EP2014458A1 publication Critical patent/EP2014458A1/de
Withdrawn legal-status Critical Current

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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
    • B31D3/02—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section
    • B31D3/0284—Laminating honeycomb cores; applying cover sheets to core edges; working core edges

Definitions

  • the present invention relates to the general field of sandwich panels of honeycomb type, consisting of a tubular cellular core core whose two faces are covered by outer skins; it relates more particularly to a method of manufacturing such a panel, an installation for carrying out this method, and the sandwich panel obtained.
  • Honeycomb panels are widely used in many industries, especially for the construction of walls, partitions, floors, ceilings, doors, tables, etc.
  • These panels comprise a central core (made of metal or other, for example aluminum) very generally formed of a juxtaposition of "tubular” cells with polygonal (especially hexagonal), circular or ovoidal, delimited by lateral walls which extend on a constant height.
  • the two "main” faces facing this central core receive cover plates, called “external skins", secured by gluing, the nature (aluminum, steel, composite, high pressure decorative laminate) is suitable for the intended application .
  • thermosetting glue of the two-component type (base + hardener), based on polyurethane, epoxy or methacrylate, in combination with a pressing operation at temperatures ranging from ambient temperature up to 130 ° C.
  • the present invention proposes a new process and a new installation for manufacturing sandwich panels of honeycomb type which, while implementing relatively simple means, allow gains in particular in terms of productivity and improve the quality of the panels obtained.
  • the draining properties of the honeycomb core material are therefore used to maintain the pressure on the panel during the cooling phase.
  • the panel obtained from the press is removed to achieve cooling, while maintaining its depression. internal.
  • the panel is applied to a temperature of between 160 and 200 ° C. for a time of between 10 and 30 minutes (preferably a temperature in the region of 180 is applied). ° C, for 20 minutes).
  • the vacuum operation is carried out at a value between -0.3 and -1 bar (more preferably between -0.5 and -0.8 bar).
  • the invention also relates to the honeycomb panel obtained by the process defined above, this panel comprising a central alveolar core on both sides facing which are glued outer skin, at least some of the cells of this central core (and preferably all or substantially all) having orifices provided at one of the ends of their side walls. These orifices are arranged, in number, in size and in location, so as to effect an effective communication of the internal volume of the different cells, to allow optimum drainage of the air within the central core and obtain a internal depression pushed.
  • FIG. 1 to 4 schematically illustrate the four main steps of the process according to the present invention, for manufacturing a honeycomb core sandwich panel coated with externally bonded skins.
  • the central core 2 very generally flat and of constant thickness e , is illustrated here in cross section; its two faces 3 and 4, called “main” correspond to its large faces whose contours define the general shape of the panel, by comparison with its small faces 7 periphery (which correspond to the edges of the panel).
  • This central core 2 may have any general shape, for example square, rectangular, circular or other, and its thickness e is generally between 5 and 50 mm. It is formed of a juxtaposition of "tubular" cells 8 which open at the level of said main faces 3 and 4 and which are delimited by side walls 9 giving them a circular polygonal constant cross section or ovoid.
  • This type of central core 2 can be obtained from metal, in particular aluminum, by a conventional technique of expansion of laminated strips.
  • orifices 10 formed in the walls 9 of the cells 8. These orifices 10 put in communication at least some of the cells 8 juxtaposed. Preferably, the vast majority of the cells 8 of the core 2 (and preferably all the cells 8) are thus placed in communication.
  • the orifices 10 have a generally circular shape with a diameter of a few millimeters (for example 3 mm), and they are formed in the middle part of the walls 9. If the technique is used mentioned above for forming the core 2 (expansion of laminated strips), they can be obtained by perforation or drilling strips before expansion.
  • the corresponding drainage can also be obtained by means of a plurality of very small perforations formed in the walls of each cell 8, made in number and in suitable dimensions. It may for example be "microperforations" made in a conventional manner during the manufacture of the core 2 to obtain a pressure equalization within the final panel, possibly associated with additional orifices of larger diameter, regularly distributed and in adapted number.
  • the hot-melt adhesive films 5 have a general shape which corresponds to that of the contour of the cellular core 2 to cover all of its main faces 3 and 4.
  • These films 5 are advantageously made of thermoplastic material, for example thermoplastic copolymer based on modified low density polyethylene (type LLBPE).
  • Their thickness (for example between 200 microns and 300 microns) is adapted in particular according to the nature of the core 2 and the two outer skins 6 that it is desired to join.
  • These outer skins 6 also have a general shape that corresponds to that of the contour of the alveolar core 2 to cover all of its main faces 3 and 4 and thus seal the end openings of the cells 8. They generally have a thickness between 0.4 and 3 mm; they can be made of metal (steel, aluminum), plastic, composite, or high pressure decorative laminate material.
  • air sealing of its peripheral edge is effected by any appropriate means 11 positioned against the small peripheral faces 7 of the central core 2 and interposed between the two edges facing each other. outside skins 6.
  • These sealing means 11 may for example consist of a high performance adhesive tape structure, a foam seal structure, suitable folds extending the outer skins 6, reported profiles, or any combination of these sealing solutions.
  • the alveolar interior volume of the multilayer assembly 1 is connected to a vacuum network via at least one vacuum tap 12.
  • the multilayer assembly 1 thus prepared ( figure 2 ) is then ready to undergo a hot pressing operation by means of a conventional heating press 14. At the time of printing, the interior volume of the multilayer assembly 1 does not need to be depressed.
  • the pressing operation ( figure 3 ) is made so as to compress the outer skins 6 against the main faces 3 and 4 of the central core 2 and this under high temperature, so as to achieve the fusion of the adhesive films 5.
  • the interior volume of the multilayer assembly 1 is depressed. This depressurization generates a plating force of the outer skins 6 against the central core 2 which makes it possible to dispense with the action of the press 14.
  • the multilayer assembly 1 can be removed from the press 14 ( figure 4 ) and be stored for its cooling phase, said press 14 then being released and ready to be used for a new cycle.
  • the internal volume of the multilayer assembly 1 is kept under vacuum throughout the cooling phase, as long as the glue is not able to fulfill its role properly.
  • the depression is stopped and the peripheral sealing means 11 can be removed (in some cases and for some applications, depending on their nature, these sealing means 11 may be retained).
  • the pressing operation is carried out for a period of between 10 and 30 minutes, at a temperature of between 160 and 200 ° C. (preferably for a time of about 20 minutes, at a temperature of about 180 ° C).
  • the applied pressing force conventional, is between 0.2 and 0.5 bar.
  • attractive tensile / plating forces are obtained by an internal negative pressure between -0.5 bar and -0.8 bar.
  • a central core variant 2 ' may be used in the context of the method according to the present invention.
  • the drainage of the honeycomb is achieved by grooves 10 'made on one side of the cells 8, in particular on the side of the least exposed face (for example, in the case of a floor, the grooves are positioned on the underside).
  • These end grooves 10 ' can be made very easily by sawing or milling before the expansion of the strip assembly, during the manufacture of the core 2.
  • This technique can also be used for the manufacture of curved panels on conformers.
  • the panel is left on the shaper for the duration of the cycle which immobilizes the tool and brakes production rates.
  • the present technique allows to remove the curved panel of the shaper before the end of the cycle, because of the preservation of the curve of the panel by maintaining its evacuation.
  • the corresponding principle using an internal depression of the panel, can also be implemented with paste thermosetting glues, in association with a heating press or not.

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  • Laminated Bodies (AREA)
EP08305396A 2007-07-11 2008-07-11 Herstellungsverfahren eines Paneels mit Honigwabenstruktur, Anlage für dessen Einbau und so erhaltenes Paneel Withdrawn EP2014458A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0705016A FR2918597B1 (fr) 2007-07-11 2007-07-11 Procede de fabrication d'un panneau de type nid d'abeille, installation pour sa mise en oeuvre et le panneau obtenu.

Publications (1)

Publication Number Publication Date
EP2014458A1 true EP2014458A1 (de) 2009-01-14

Family

ID=39016267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08305396A Withdrawn EP2014458A1 (de) 2007-07-11 2008-07-11 Herstellungsverfahren eines Paneels mit Honigwabenstruktur, Anlage für dessen Einbau und so erhaltenes Paneel

Country Status (2)

Country Link
EP (1) EP2014458A1 (de)
FR (1) FR2918597B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2063085A1 (de) * 1969-09-30 1971-07-02 Cellu Prod Co
FR2568514A1 (fr) * 1984-07-31 1986-02-07 Hexagone Procede de surfacage de bandes de papier a reseau interieur alveolaire et machine pour sa mise en oeuvre
EP0543636A1 (de) * 1991-11-21 1993-05-26 Hitachi, Ltd. Plattenstruktur und Verfahren zur dessen Herstellung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2063085A1 (de) * 1969-09-30 1971-07-02 Cellu Prod Co
FR2568514A1 (fr) * 1984-07-31 1986-02-07 Hexagone Procede de surfacage de bandes de papier a reseau interieur alveolaire et machine pour sa mise en oeuvre
EP0543636A1 (de) * 1991-11-21 1993-05-26 Hitachi, Ltd. Plattenstruktur und Verfahren zur dessen Herstellung

Also Published As

Publication number Publication date
FR2918597A1 (fr) 2009-01-16
FR2918597B1 (fr) 2011-01-14

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