EP0747547B1 - Procédé de fabrication d'un panneau ou analogue à propriétés structurale et acoustique et panneau ainsi obtenu - Google Patents
Procédé de fabrication d'un panneau ou analogue à propriétés structurale et acoustique et panneau ainsi obtenu Download PDFInfo
- Publication number
- EP0747547B1 EP0747547B1 EP96450012A EP96450012A EP0747547B1 EP 0747547 B1 EP0747547 B1 EP 0747547B1 EP 96450012 A EP96450012 A EP 96450012A EP 96450012 A EP96450012 A EP 96450012A EP 0747547 B1 EP0747547 B1 EP 0747547B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- skins
- skin
- glue
- panel
- order
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 13
- 239000003292 glue Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 10
- 239000004697 Polyetherimide Substances 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 7
- 239000010408 film Substances 0.000 claims description 7
- 229920001601 polyetherimide Polymers 0.000 claims description 7
- 239000003365 glass fiber Substances 0.000 claims description 5
- 238000007731 hot pressing Methods 0.000 claims description 4
- 239000004753 textile Substances 0.000 claims description 3
- 229920005992 thermoplastic resin Polymers 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 239000010438 granite Substances 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 239000011800 void material Substances 0.000 claims description 2
- 229920006335 epoxy glue Polymers 0.000 claims 1
- 230000000977 initiatory effect Effects 0.000 claims 1
- 239000011707 mineral Substances 0.000 claims 1
- 238000005192 partition Methods 0.000 description 16
- 238000006116 polymerization reaction Methods 0.000 description 10
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 239000000835 fiber Substances 0.000 description 6
- 238000007596 consolidation process Methods 0.000 description 5
- 238000010411 cooking Methods 0.000 description 4
- 229920006332 epoxy adhesive Polymers 0.000 description 4
- 239000002313 adhesive film Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002557 mineral fiber Substances 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 241000257303 Hymenoptera Species 0.000 description 1
- 229920000784 Nomex Polymers 0.000 description 1
- 229920004738 ULTEM® Polymers 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004763 nomex Substances 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000004834 spray adhesive Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B1/86—Sound-absorbing elements slab-shaped
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
- E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
- E04C2/36—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels
- E04C2/365—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels by honeycomb structures
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B2001/742—Use of special materials; Materials having special structures or shape
- E04B2001/748—Honeycomb materials
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
- Y10T428/24322—Composite web or sheet
- Y10T428/24331—Composite web or sheet including nonapertured component
Definitions
- the present invention relates to a method of manufacturing a panel or analogous to structural and acoustic properties and more precisely to a sandwich type structure formed by a honeycomb core coated on both faces, having both resistance to loads capacities important and acoustic attenuation.
- a process of this kind is described in document US-A-5,037,498.
- the invention is obviously susceptible applications in any other area where is necessary or desirable to use a sandwich panel structure combining lightness, great mechanical resistance and acoustic properties.
- turboprop aircraft pose problems sound insulation of the interior passenger compartment, in particular against noise and vibrations generated by engines, propellers, aerodynamic noise, etc ...
- the invention aims precisely to propose a new type of panel suitable for the production of passenger cabin partitions.
- partitions must necessarily be structural elements, that is to say capable of supporting loads or efforts, in particular normally in terms of partitions, which can be very large. They must indeed contain, on the hold side, baggage in the event of an aircraft crash, or resist abrupt depressurization of the cabin or hold.
- these partitions must have an aspect, cabin side aesthetic, that is to say being decorated in accordance with the rest of the cabin.
- Structural panels intended to reduce for example the effects of a crash have no noise processing properties.
- sandwich type panels formed of a core in particular honeycomb, flanked, on one side, by a metallic foil perforated and, on the other side, an unperforated metal sheet, used for their noise attenuation properties, for example as coatings in certain locations in the turbine engine nacelle to absorb at least partially the sound energy of high speed gas flows.
- the invention aims to propose a new type of panel likely in particular to reconcile the most severe requirements in terms of lightness, rigidity and mechanical resistance.
- the two skins are made of fabrics of fibers of glass impregnated with polyetherimide resin.
- the two skins are made up of the same number of folds, but advantageously can have a different number, such a distribution asymmetrical skins on either side of the central core allowing reduce the mass and cost of the panel, without affecting its flatness, due to the multiphase manufacturing of the panel, i.e. separate consolidation of elements of the panel before cooking the whole.
- This is how the skin non-perforated may have a number of plies, three for example, less than that, for example four, of the perforated skin, the number of folds being directly related to the forces likely to apply to the panel.
- the coating of epoxy adhesive is applied in the form of a thin film of very low surface mass and the polymerization cycle involves a rise in temperature to a first level of sufficient value and duration to cause the glue to flow without as much to significantly initiate its polymerization, so as not to obstruct skin perforations, then at a second level of value and duration sufficient to carry out said polymerization.
- the subject of the invention is also the panel obtained in accordance with the above process, such a panel being for example dimensioned, shaped and provided with border elements, inserts and other arrangements for the construction of fuselage bulkhead elements. aircraft.
- Such partition elements have been found to have excellent acoustic attenuation properties for frequencies above 500 Hz and resistance to heavy loads normally applied to the partition.
- a panel according to the invention with a surface of 1.5 m 2 withstood forces of the order of 900 daN.
- the perforated face of such a partition can be easily treated aesthetically, either by dyeing the bulk of the resin the skin, with a relief surface appearance, for example a granita, obtained at molding, either by thermo-sheathing a coating such as a perforated decorative film, either by applying such a coating or acoustically textile transparent.
- Figure 1 we have schematically shown a sandwich panel seen on the edge and comprising a central core with an open honeycomb structure 1, flanked by and on the other side of a skin, namely a 2-ply lower skin and a skin upper multiply 3.
- each skin 2,3 is made up of several pleats each formed from a fabric of impregnated synthetic or mineral fibers of a thermoplastic resin and each skin is consolidated before assembly sandwich.
- a fabric of prepreg fibers is draped according to several layers or folds superimposed on a suitable flat surface.
- the assembly is compacted at an appropriate temperature according to the nature of the fibers and resin so as to obtain a rigid self-supporting skin.
- Such a operation commonly called consolidation, is in itself well known to skilled in the art and there is no need to give further details.
- type E glass fibers will be used impregnated with 30 to 35% polyetherimide resin. More precisely still, as particularly suitable fibers and resin, there may be mentioned, on the one hand, the E glass fiber fabrics known in the trade under the designation "7781" and, on the other hand, the polyetherimide resin called commercially "ULTEM” ® manufactured by GENERAL ELECTRIC.
- the terms "superior” and “inferior” having in fact no practical significance since the final sandwich can be used in any position in space, is further, in accordance with the invention, provided, after consolidation, with a plurality of identical holes 4 normally passing through the thickness of the skin.
- the proportion, in total area of the skin 3, of the voids or holes 4 is around 10 to 25% and the diameter of holes 4 is around 0.5 to 1.5 mm and more particularly still 1 mm for a percentage of voids of the order of 23%. It is also preferable that the diameter of the holes is greater than or equal to the thickness of the skin.
- the distribution of the holes is uniform over the entire surface.
- the skins 2 and 3 are advantageously made from the same fibers and resin and, according to another characteristic of the invention, comprise a different number of folds, that of the perforated skin 3 being for example higher than that of unperforated skin 2.
- the non-perforated skin 2 has three folds: 2a, 2b, 2c and the perforated skin 3 has four: 3a, 3b, 3c, 3d.
- the skins 2,3 are assembled, by bonding, to the core 1.
- This is, in general, a honeycomb structure open along an axis perpendicular to the median plane of the soul and, in particular consists of a honeycomb structure, for example made of paper aramid fibers such as that known commercially as "NOMEX” ®.
- each skin 2, 3 is coated with an appropriate epoxy adhesive, applied as evenly as possible.
- the adhesive will be applied by spraying, but preferably it will consist of a thin film of very low surface mass, of the order of 70 g / m 2 for example. More particularly still, the adhesive film called SCOTCH-WELD® AF 163-2U manufactured by the company 3M is remarkably suitable. It should be noted that this adhesive is self-extinguishing and that, preferably, an adhesive having this property will be used.
- the 1,2,3 parts of the sandwich are superimposed on a tray heating press and subjected to a cooking cycle for the purpose of adhesive polymerization.
- the polymerization cycle is operated at constant pressure, around 1 bar or a little more, and bringing the temperature to a first level 5, around 80 ° C, then at a second level 6, around 130 ° C, before going down to a temperature of the order of 50 ° C at which the pressure is removed and the panel is demolded.
- FIG. 3 illustrates a cycle of the above type, during which the bearing 5 temperature at 80 ° C is maintained for 30 minutes and the level 6 at 130 ° C for 60 minutes, a pressure of 1.2 bar being maintained throughout cycle.
- the temperature of the first stage 5 and the duration thereof determined to be sufficient to cause the glue to flow without and significantly initiate the polymerization phase.
- the glue will liquefy and at the level of the perforated skin holes the film will break and the glue material will clump together to form a meniscus at the skin 3 - core 1 interface and on the around each hole 4.
- the second temperature level 6 it is carried out at a temperature and for a sufficient time to allow polymerization total.
- FIG. 2 illustrates a panel produced according to the stacking diagram of the figure 1.
- the panel will be directly shaped and dimensions of the partition or partition element to be obtained, for example for separate the hold and passenger areas of a turboprop aircraft.
- the number of folds of each will be determined according to the nature and location of the partition to be carried out, a laser clipping of the skins will be carried out, then possibly folding and sinking. Likewise, the honeycomb will be machined, crimped and cut.
- the faces to be glued on the skins will be sanded, dusted, degreased and coated or coated with a suitable epoxy adhesive film.
- the three components of the sandwich will then be put in place in a mold, and supplemented by border elements, reinforcement, inserts etc ...
- the mold will then be placed between the plates of a heating press to undergo said polymerization cycle of the glue or adhesive.
- the panels, partitions or partition elements thus obtained can be flat or curved or have flat parts forming an angle between them.
- the method of the invention makes it possible to obtain consolidated skins, ready for assembly, plywood, each ply having a thickness of 0.25mm and a surface mass of 450 g / m 2 for a ply non-perforated and 350 g / m 2 for a perforated ply, the fiber fabrics being made of E glass, a surface mass of 300 g / m 2 , with a thickness of 20/100 of a millimeter, weave satin 8, with a number of warp threads of 22 and weft threads of 20, while the resin is of the polyetherimide type.
- Consolidation of the skins before assembly makes it possible to produce asymmetrical panels having one face reinforced with more folds than the other side.
- the technique of the invention makes it possible to remove such a fold on the less face solicited, which lowers the mass of the assembly and the cost.
- sandwich panel surfaces remain perfectly flat despite the asymmetrical distribution of skins.
- the thickness of the core 1 is directly linked to the frequency spectrum that one wishes to attenuate.
- the thickness of the core 1 will typically be of the order of twenty millimeters.
- the diameter of the holes 4 it is fairly closely related to the percentage vacuum in the perforated skin, it being understood that the pair of these two parameters (diameter of the holes and percentage of vacuum) can change in function of the acoustic characteristics or properties of any elements decorative coverings which could be provided on the perforated skin.
- panels, partitions or other products obtained in accordance to the process of the invention comply with standard FAR 25 ⁇ 853 (criteria for Fire / Smoke / Toxicity) applicable to commercial aircraft, in particular due to the choice for the skins of a polyetherimide resin.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Electromagnetism (AREA)
- Laminated Bodies (AREA)
Description
- à réaliser une première et une seconde peau par drapage et pressage à chaud dans des conditions de pression et température appropriées d'au moins deux plis de tissu de fibres minérales ou synthétiques imprégnées d'une résine thermoplastique,
- à réaliser dans l'une des peaux des perforations d'un diamètre de l'ordre de 0,5 à 1,5 mm, avec une proportion de vide à la surface de la peau de l'ordre de 10 à 25%,
- à appliquer sur l'une des faces de chaque peau, après préparation, un revêtement de colle époxy,
- à former un sandwich comprenant ladite âme à structure alvéolaire ouverte avec les deux peaux sur ses faces opposées, les revêtements de colle étant en contact avec l'âme,
- puis à presser à chaud le sandwich à des fins de polymérisation de la colle dans des conditions de température, pression et durée évitant toute obstruction même partielle des perforations de la peau perforée.
- Figure 1 est une vue en coupe et en éclaté schématique d'une structure de panneau selon l'invention ;
- Figure 2 est une vue en perspective partielle et en arraché d'un panneau réalisé, du type illustré en figure 1, et
- Figure 3 est une courbe illustrant un cycle de cuisson préférentiel du panneau.
Claims (16)
- Procédé de fabrication d'un panneau ou analogue à propriétés structurale et acoustique du type sandwich constitué d'une âme à structure alvéolaire ouverte (1) revêtue sur ses deux faces, caractérisé en ce qu'il consiste :à réaliser une première et une seconde peau (2,3) par drapage et pressage à chaud dans des conditions de pression et température appropriées, d'au moins deux plis de tissu de fibres minérales ou synthétiques imprégnées d'une résine thermoplastique,à réaliser dans l'une des peaux (2,3) des perforations (4) d'un diamètre de l'ordre de 0,5 à 1,5 mm, avec une proportion de vide à la surface de la peau de l'ordre de 10 à 25%,à appliquer sur l'une des faces de chaque peau, après préparation, un revêtement de colle époxy,à former un sandwich comprenant ladite âme à structure alvéolaire ouverte (1) avec les deux peaux (2,3) sur ses faces opposées, les revêtements de colle étant en contact avec l'âme,puis à presser à chaud le sandwich à des fins de polymérisation de la colle dans des conditions de température, pression et durée évitant toute obstruction même partielle des perforations de la peau perforée (3).
- Procédé suivant la revendication 1, caractérisé en ce que les peaux (2,3) sont constituées de tissus de fibres de verre imprégnées de résine polyétherimide.
- Procédé suivant la revendication 1 ou 2, caractérisé en ce que les deux peaux (2,3) ont des nombres différents de plis.
- Procédé suivant la revendication 1 à 3, caractérisé en ce que le revêtement de colle est un film mince de très faible masse surfacique.
- Procédé suivant la revendication 4, caractérisé en ce que la colle est une colle auto-extinguible.
- Procédé suivant la revendication 4 ou 5, caractérisé en ce que le film de colle est le film dénommé SCOTCH-WELD® AF 163-2U de la Société 3M.
- Procédé suivant l'une des revendications 4 à 6, caractérisé en ce que l'étape de polymérisation est opérée suivant un cycle comportant une montée en température à un premier palier d'une valeur et d'une durée suffisantes pour faire fluer la colle sans pour autant lancer de manière significative sa polymérisation, puis à un second palier d'une valeur et d'une durée suffisantes pour réaliser ladite polymérisation.
- Procédé suivant la revendication 7, caractérisé en ce que ledit premier palier de température est maintenu pendant une durée de l'ordre de 30 minutes et ledit second palier de température est maintenu pendant une durée de l'ordre de 60 minutes.
- Panneau ou analogue obtenu conformément au procédé selon l'une quelconque des revendications 1 à 8.
- Panneau suivant la revendication 9, caractérisé en ce que l'âme à structure alvéolaire est un nid d'abeilles (1).
- Panneau suivant la revendication 9 ou 10, caractérisé en ce qu'il comporte une peau non perforée (2) à trois plis et une peau perforée (3) à quatre plis, chaque pli ayant une épaisseur de 0,25 mm et étant constitué de fibres de verre du type E imprégnées de résine polyétherimide.
- Panneau suivant l'une des revendications 9 à 11, caractérisé en ce que la peau perforée (3) comporte des perforations d'un diamètre de l'ordre de 1 mm, le pourcentage des vides dans la peau étant de l'ordre de 23%.
- Panneau suivant l'une des revendications 9 à 12, caractérisé en ce que la résine d'au moins l'une des peaux (2,3) est teintée dans la masse.
- Panneau suivant l'une des revendications 9 à 12, caractérisé en ce que la face visible d'au moins l'une des peaux (2,3) est revêtue par thermogainage d'un film décoré, perforé ou non.
- Panneau suivant l'une des revendications 9 à 12, caractérisé en ce que la face visible d'au moins l'une des peaux (2,3) est revêtue d'un textile acoustiquement transparent ou non.
- Panneau suivant l'une des revendications 9 à 12, caractérisé en ce que la face visible d'au moins l'une des peaux (2,3) présente un aspect de surface en relief, notamment un granité.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9507020 | 1995-06-08 | ||
FR9507020A FR2735166B1 (fr) | 1995-06-08 | 1995-06-08 | Procede de fabrication d'un panneau ou analogue a proprietes structurale et acoustique et panneau ainsi obtenu |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0747547A1 EP0747547A1 (fr) | 1996-12-11 |
EP0747547B1 true EP0747547B1 (fr) | 2000-04-19 |
Family
ID=9479939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96450012A Expired - Lifetime EP0747547B1 (fr) | 1995-06-08 | 1996-06-05 | Procédé de fabrication d'un panneau ou analogue à propriétés structurale et acoustique et panneau ainsi obtenu |
Country Status (7)
Country | Link |
---|---|
US (1) | US5888610A (fr) |
EP (1) | EP0747547B1 (fr) |
CN (1) | CN1078844C (fr) |
CA (1) | CA2178148C (fr) |
DE (1) | DE69607783T2 (fr) |
ES (1) | ES2147908T3 (fr) |
FR (1) | FR2735166B1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007060668A1 (de) | 2007-12-17 | 2009-06-18 | Airbus Deutschland Gmbh | Sandwichpaneel zur Schallabsorption |
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FR2779379B1 (fr) * | 1998-06-05 | 2000-08-25 | Peguform France | Procede de realisation d'un panneau de structure composite renforcee du type sandwich a ame alveolaire et panneau realise selon un tel procede |
AT408007B (de) * | 1999-08-16 | 2001-08-27 | Wimmer Peter Dipl Ing | Bauplatte mit einem metallgewebe |
DE19943320A1 (de) * | 1999-09-10 | 2001-03-15 | Hauni Maschinenbau Ag | Anordnung zur Absenkung des Lärmpegels an Produktionsmaschinen der tabakverarbeitenden Industrie |
GB2361718A (en) * | 2000-04-26 | 2001-10-31 | Wang Chao Shun | Sound reduction device within a soundproof wall |
US6500516B2 (en) | 2001-02-02 | 2002-12-31 | Panelite Llc | Light transmitting panels |
US6890023B2 (en) | 2002-04-19 | 2005-05-10 | Patent Holding Company | Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same |
US6655299B2 (en) | 2001-10-30 | 2003-12-02 | Patent Holding Company | Reinforced composite pallet assembly of the cellular core sandwich-type |
US6748876B2 (en) | 2001-10-30 | 2004-06-15 | Patent Holding Company | Reinforced composite pallet assembly of the sandwich-type with a locally crushed cellular core |
US6823803B2 (en) | 2001-10-30 | 2004-11-30 | Patent Holding Company | Assembly for enclosing and protecting a plurality of meters for storage or transportation purposes and carrier and pallet for use therein |
US20040097159A1 (en) * | 2001-11-07 | 2004-05-20 | Balthes Garry E. | Laminated composition for a headliner and other applications |
US8158539B2 (en) * | 2001-11-07 | 2012-04-17 | Flexform Technologies, Llc | Heat deflection/high strength panel compositions |
US8012889B2 (en) * | 2001-11-07 | 2011-09-06 | Flexform Technologies, Llc | Fire retardant panel composition and methods of making the same |
US8071491B2 (en) * | 2001-11-07 | 2011-12-06 | FledForm Technologies, LLC | Process, composition and coating of laminate material |
US20030162461A1 (en) * | 2002-02-22 | 2003-08-28 | Balthes Garry E. | Process, composition and coating of laminate material |
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-
1996
- 1996-05-31 US US08/655,932 patent/US5888610A/en not_active Expired - Lifetime
- 1996-06-04 CA CA002178148A patent/CA2178148C/fr not_active Expired - Fee Related
- 1996-06-05 EP EP96450012A patent/EP0747547B1/fr not_active Expired - Lifetime
- 1996-06-05 ES ES96450012T patent/ES2147908T3/es not_active Expired - Lifetime
- 1996-06-05 DE DE69607783T patent/DE69607783T2/de not_active Expired - Lifetime
- 1996-06-07 CN CN96110380A patent/CN1078844C/zh not_active Expired - Fee Related
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DE102007060668A1 (de) | 2007-12-17 | 2009-06-18 | Airbus Deutschland Gmbh | Sandwichpaneel zur Schallabsorption |
Also Published As
Publication number | Publication date |
---|---|
DE69607783D1 (de) | 2000-05-25 |
US5888610A (en) | 1999-03-30 |
FR2735166A1 (fr) | 1996-12-13 |
FR2735166B1 (fr) | 1997-08-29 |
ES2147908T3 (es) | 2000-10-01 |
CA2178148A1 (fr) | 1996-12-09 |
CN1141866A (zh) | 1997-02-05 |
DE69607783T2 (de) | 2000-11-23 |
EP0747547A1 (fr) | 1996-12-11 |
CA2178148C (fr) | 2008-01-29 |
CN1078844C (zh) | 2002-02-06 |
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